|
Injector upgrade thoughts. 2 Attachment(s)
Injector upgrades.
Here is some info about Injectors posted on the Cherokee forum by warpath4x4 and coas in early/ mid 2009. I have made some minor changes for clarity however the below the link takes you to the original thread. http://www.cherokeeforum.com/f2/more...-13848/index2/ I have also added other stuff from other sources, and most of the pictures. 87-90 Cherokees have a jetronic/minitimer/EV1type injector electrical connector 90-93 Cherokees have a jetronic/minitimer/EV1 type injector electrical connector 94-95 Cherokees have a jetronic/minitimer/EV1 type injector electrical connector 96-98 Cherokees have a jetronic/minitimer/EV1 type injector electrical connector 99-2001 Cherokees have a EV6/USCAR type injector electrical connector http://www.ausjeepoffroad.com/forum/...4b6e9c0e2b.jpghttp://www.ausjeepoffroad.com/forum/...4b9a1d3252.jpg What you have: 4.0L '96 onwards have 49 PSI on the fuel rail constant. '99-'04, .........4854181, ...Blue tip, ....................22.5lb/hr@49psi(236cc/min@337KPa)=21.14Lb/hr@43.5psi (222cc/min@300kpa) http://www.witchhunter.com/flowdatapix/s04854181.jpg '96-'98, ........53030778, ...Grey, .......................23.2lb/hr@49psi(243cc/min@337KPa)=21.71lb/hr@43.5psi(228cc/min@300kpa) http://www.witchhunter.com/flowdatapix/s53030778.jpg Pre 96 the fuel pressure is lower and variable 31PSI @ idle& 39 PSI at wide open throttle. '94-'95, ........53030343, ...Tan, ........................23.61Lb/hr@43.5psi(248cc@300kpa) http://www.witchhunter.com/flowdatapix/s53030343.jpg '91-'93, ........33007127, ...Brown, ....................23.61Lb/hr@43.5psi(248cc@300kpa) http://www.witchhunter.com/flowdatapix/s33007127.jpg '87-'90, ........53003956, ...Black, ......................22.8Lb/hr@43.5psi(240cc @300kpa) http://www.quadratec.com/Assets/Imag...5/16045-md.jpg Thease all black "RENIX" injectors are stated in a number of places on the web as having a flow rate of 18.5lbs/ hour. However when coas tested them on a professional injector test bench he got figures of 22.8lb/hr@43.5psi(240cc/min @300kpa) which would flow about 21.5lb/hr@39psi. Hence that is the figure we are going with here. EV1.3 Ford injectors Rated at the same pressure and with EV1/ jetronic electrical connectors, Have been a popular choice as an upgrade: Ford Motorsport 19.0lb/hr @ 39psi (Part no. FMS-M9593-C302) http://i641.photobucket.com/albums/u...rs/6827471.jpg Ford Motorsport 24.0lb/hr @ 39psi (Part no. FMS-M9593-A302) http://www.witchhunter.com/flowdatapix/b0280150947.jpg Ford Motorsport 30.0lb/hr @ 39psi (Part no. FMS-M9593-B302) http://www.mperacing.com/fms-m-9593-b302.jpghttp://www.witchhunter.com/flowdatapix/b0280150945.jpg little math. Injector size (lb/hr) = (horsepower x 0.5)/(no.of cylinders x 0.8 ) So say you have a 250 horse I6... 125/4.8=26 lb/hr injector So for a 30 lb/hr injector, you would need about a 290 horse motor to utilize them. Cherokees from 93 on made around 190hp stock= 19.8 lb injectors according to the above formula The 24lb injectors should be good for some 230hp. Ev1/ EV1.3 injectors worked OK but EV6 is better The EV1 (pintal type) & EV1.3 4 hole injectors are inferior to the newer EV6 injectors for a number of reasons. 1) EV1&1.3 injectors can only be used at their nominal design pressure. Ev6 injectors can be used over a wide range of fuel rail pressures. 2) EV1&1.3 injectors are made of metal and plastic, which can leak or even brake at the join, and due to the metal are more prone to heat soak, Ev6 injectors are constructed of a single plastic casting. 3) Response time of the EV6 injectors are quicker than the older designs. Atomization of the fuel is also better / more complete. Extract from bosch fuel injector pamphlet: http://www.cannell.co.uk/Bosch_Techn...linjectors.pdf Effects of Fuel Pressure on Pintle Type Fuel Injectors. Fuel velocity through a pintle type fuel injector [type code EV 1] can dra- matically affect its ability to atomise fuel. The profile of the pintle used in a fuel injector has a direct relationship to the operating pressure it is designed to operate under. Whilst Bosch produce various fuel injectors that may flow the same amount of fuel at a given specification, the system operating pres- sure will influence the pintle profile. Correct pressure will result in a well atomised spray, while insufficient pressure will result in a “hosing” effect. Excessive pressure will result in either “hosing” or a spray angle that is too large for the targeted area dependent on the pintle profile. The consequence of excessive fuel pressure on a pintle type injector may well be that as the pressure is increased the mixture values of the engine may appear to get leaner. This is of course not the case, but the fuel being injected is no longer atomised and is entering the cylinder as a liquid mass. This will typically cause the Hydrocarbon [HC] values to rise due to the raw fuel exiting the cylinder, and the Carbon Monoxide [CO] to drop due to insufficient combustion. Later design fuel injectors [type code EV 6] use “director plate” multi-ori- fice technology to better atomise fuel across various operating pressures. These injectors allow more flexibility in relation to operating pressures with- out compromising spray efficiency or fuel atomisation. EV6, multi-orifice/ director plate, injector end http://www.ausjeepoffroad.com/forum/...78e3e6046d.jpg From coas: EV6 multi hole injectors are better alternative than the above mentioned ford EV1.3 injectors for 4l jeep engines, Renix should use the same flow injectors as the HO, the stock injectors for Renix flow 240cc, HO flow 248cc (up to 95-OBD1) and 234cc (96- up OBDII). However, the Renix and OBDI flow at 39PSI and the later OBDII ('96 onwards) flow at 49PSI. Note -The Renix mpi system was never sold in Australia - Injector flow is always measured at 3 Bar, 43.5PSI. This is a reference point and from this you can calculate the flow to your system working pressure. Calculators: http://www.witchhunter.com/injectorcalc1.php4 INJECTORS for XJ CHEROKEES Pre 1999 with jetronic/minitimer/EV1 type injector electrical connector So, why not "yellow stick" #19 Ford Bosch 0280155710 injectors? (same injector also has part numbers:F4SZA, CM4768, F4SEA1B, 0280155710, F6VZ9F593AA, F5VZ9F593AA, 0280155700, CM4809). http://www.witchhunter.com/flowdatapix/b0280155710.jpg Because stock XJ injectors flow more than 230cc, and these flow about 210cc, and don't have a clip nut for holding the injectors level.(The 0280155745 does take a clip nut and is otherwise identical to 0280155710 ) all stock XJ injectors use a clipnut http://www.ausjeepoffroad.com/forum/...78e3e6b8c6.jpg Why not FMS M9593-A302 255cc (24 lb)? http://www.witchhunter.com/flowdatapix/b0280150947.jpg Too much flow for any stock 4.0L and old design, not as efficient as the newer EV6 Bosch injectors. A better alternative is Neon 2.0L 95-96 injectors. They have a flow of 238cc (22.6 lb) @ 43psi, Part# 0280155703 (OEM# 5277739). ebay http://www.witchhunter.com/flowdatapix/b0280155703.jpg These are EV6 4 hole injectors with clip nut. Better fuel economy, better throttle response, better power. The disadvantage is that you'll need to take these out of two cars. A list of vehicles that came with these injectors can be found here: http://www.fuelinjector.citymaker.co...25/4735791.htm Another alternative are the 1999-00 Corvette LS1 injectors 0280155890, http://www.ausjeepoffroad.com/forum/...78fa278c1c.jpg They flow a bit less than the Neon injectors at 3 bar (22.5lb/hr) but will do just fine in any 4.0L. Some refer to these as 26.6lb/hr injectors but this is the flow at 4bar, at 39PSI/2.7bar they will flow 21 lb/hr So why replace 248cc/min injectors with 238cc/min injectors? the EV6 injectors are capable of better atomization of the fuel hence less fuel is needed each stroke for the right A/F mixture. If there is a need for more flow one can use the 96-98 Taurus/Sable 3l V6 DOHC injectors, 0280155715 256cc(24 lb ). http://www.witchhunter.com/flowdatapix/b0280155715.jpg These are EV6 without clip nut and flow exactly the same at the FMS M9593-A302. Another option would be the 2001-02 Camaro, 2001-04 Corvette LS1 injectors 0280155931 http://www.witchhunter.com/flowdatapix/b0280155931.jpg which flow a bit less but does have a clip nut. Both will out perform the older 24lb/hr EV1.3 FMS-M9593-A302 injectors. INJECTORS for XJ CHEROKEES 1999-2001 With EV6/USCAR type injector electrical connector That is they are different from the earlier models. http://www.ausjeepoffroad.com/forum/...4b9a1d3252.jpg Stock Jeep injector: http://www.witchhunter.com/flowdatapix/s04854181.jpg 22.5lb/hr@49psi (236cc/min@337KPa) or 21.14Lb/hr@43.5psi (222cc/min@300kpa) Owners have used Ford 19# XF2E-C4B=204cc@43.5PSI injectors with success, they have the same specification as the #19 ford 280155710 (i.e. 4 hole ev6 style with a nominal working pressure of 39PSI) just with a UScar electrical connector and take clipnuts. http://www.ausjeepoffroad.com/forum/...78fa2808ac.jpg More flow (much closer to the stock injector flow rate than the ford XF2E-C4B) is provided by Bosch #0280155784 (22.5#=238cc@43.5psi), which are the same as the older Neon injectors 0280155703, but with a uscar electrical connector. http://www.ausjeepoffroad.com/forum/...796e5f1122.png Chrysler part # 4669938 from; DODGE CARAVAN (1998 - 2000) DODGE NEON (1998 - 1999) DODGE STRATUS (1998 - 2000) Another alternative for the stock 99-up 4.0L is the (22.8#=240cc @ 43.5psi) Ford XR3Z 9F593 A4B / XR3E 9F593 A4B which is the newest design and offer even better performance. http://www.ausjeepoffroad.com/forum/...796e660463.png (MOTORCRAFT #CM-4956,CM4956 XR3Z9F593AB, XR3Z-9F593-AB, XR3E9F593A4B, XR3E-9F593-A4B, YR3Z9F593AB, YR3Z-9F593-AB=all the same injector) This injector has a single hole and looks disappointingly similar to the stock 99-'01 injector . The main method for increasing atomization in the ev6 injectors was by increasing holes number and reducing each hole size. One can't add holes and reduce size indefinitely, so a new approach was needed when regulations became more strict. The newer design is not relying on number of holes, it's a completely different approach with the difference in the internal orifice which allows far better atomization. This also gives an even better ability to work on variable pressure, as with most newer cars the pressure is computer controlled. This, in turn, gives more accurate fuel mixture at any given pressure. You can check the two in your fuel rail, when out, and compare the spray pattern, with the newer the fuel is like a mist. Currently these can be bought near new for around $60 a set on ebay. If even more flow is required the “1999 only” Taurus/Sable injectors, 0280155849 can be used. http://www.ausjeepoffroad.com/forum/...796e64e819.png This EV6 injector will flow 265cc/min @ 43.5 PSI, same as the FMS M9593-A302(24 lb) but with USCAR connector so the original injector clips on the loom will plug straight on.. Last, don't use lb/hr for rating injectors flow, as it always calculated from cc/min since injectors flow is Always measured using cc measuring tube. Some use 10.5 for calculating lb/hr, some use 10.4 and neither is correct. I was thinking of upgrading my Injectors. The above is a result of the research I did, I hope someone finds it useful. Handy links: Most of the injectors mentioned above can be bought reconditioned for about $25 usd each, here: http://www.fuelinjector.citymaker.co...ge/5522851.htm Alternatively: http://www.injectorwarehouse.com/index.html Injector Pictures & flow rates: http://injector-rehab.com/kbse/flowrates.htm http://www.witchhunter.com/injectordata1.php4 Bosch injector specifications: http://www.usrallyteam.com/content/p...ector_data.xls Cross referencing of part numbers: http://www.bostechfuel.com/index.php Injector Electrical Connector Adapters — Bosch, Siemens Denso Fuel Injectors fiveomotorsport.com EV6 to EV1 Adapters 91-95 Jeeps with Fuel Pressure Regulators (FPR) on the fuel rail. Stock FPR Chrysler # 5303 0001 Supplies 31psi @ Idle and 39PSI at wide open throttle (WOT) http://www.ausjeepoffroad.com/forum/...793c07ac2c.jpg OBD1 upgrade Supplies 40psi @ Idle and 48PSI @ WOT Drops straight in, no modifications. Chrysler # 4418850 or 5277829 or 5277864 (Manufacturer: Delphi, Part#FP10046) ~$40USD on US ebay. (thanks to coas from cherokeeforum). Drop in Adjustable FPR (he also does one for renix) http://www.strokedjeep.com/regulator.html Adjustable FPR from hesco, requires the use of a file: http://www.hesco.us/shop.asp?action=...022&catId=7973 For the Ausi Wrecking yard Ferrets& Ebay bandits AU ford Falcon 4.0L Stock injector Bosch # 0280155844 have the exact same specifications as the (American ford 19#) 0280155710 but takes clip nuts. Holden Commodore 3.8l V6 VT, VU, VX, VY, WH, WK and KIA Mentor and Shuma http://www.ausjeepoffroad.com/forum/...793c092ab8.jpg Bosch #0280155777 Have a coil resistance of 12 ohms and a nominal working pressure of 49psi otherwise the flow rates @ 43.5psi are just a wee (insignificantly so) bit smaller and all other specifications are the same as the ford AU injectors. It should be reiterated here that the #19 ford (and holden) injectors will drop straight in and work. However they do not really flow enough for use in a jeep 4L motor in '95 or earlier models that run 39PSI on the fuel rail at WOT. They may cause a lean condition at WOT and they will spend a lot of time working at grater than 80% duty cycle, this causes inefficient fuel atomization and a markedly shorter injector service life. If you run a 48-49PSI fuel rail pressure you should be able to get a flow of 220cc which is the minimum of what is required. If I had a post '96 (OBD2) I would verify I had 48-49PSI on the fuel rail, then I would go for the VT commodore injector, It has a lower impedance and Bosch state its nominal operating pressure is 350KPa/ 49PSI. Also, 3.8l VT Commodore makes 147kw @ 5200 RPM = 197 HP. Our jeeps make 190HP, so the injectors can do it. And you can get cleaned & tested sets of 6 for ~ $120 on ebay. Make no mistake, the beginning , middle & end of the "putting ford/ holden injectors in jeeps" argument is that they are common= cheap. They are at the minimum side of what is ideal (but does work), so if you are porting heads, going with bigger valves and or playing with cams you may wish to fork out a little extra coin and go for 703/784 injectors mentioned above. Or even thease; Injectors from a HSV VR, VS AND VT SERIES 1, 5.7L V8. Bosch #0 280 156 013 (they are bright orange) these flow at around 230cc@43.5psi, Which is much closer to the stock injector flow rates, have 12ohm resistance and a nominal working pressure of 49PSi. Your not realy likely to just stumble across these in a wrecking yard but it is an option, and you can get them new on ebay http://www.ausjeepoffroad.com/forum/...78fa28cf25.jpg TIP Sheet If the above post made your eyes water and brain hurt (ie your normal) this tip sheet is a summery of research & thought process outlined above. Look up your XJ year, pick your injector. http://i641.photobucket.com/albums/u...injector-1.jpg Is my jeep OBD1 (39psi @W.O.T.) or OBD2 (49psi@W.O.T)? http://www.ausjeepoffroad.com/forum/...79b9f1d978.png How to: Injector replacement in a XJ,TJ&ZJ. http://http://www.naxja.org/forum/showthread.php?t=1101279 http://www.cherokeeforum.com/f67/703...rite-up-66456/ DIY Injector rebuild http://www.watkinsmotorsports.com/ho..._injector.aspx |
The reason for going with new injectors are primarily that at wide open throttle it was running a bit lean(but not lean enough to ping), oxy voltage was .7-.75 volts whereas for max power I should be looking at .85-9 volts.
other reasons were that the injectors in there are 15years old and to get then cleaned was going to cost about $150, and if one still doesn't flow correctly after cleaning then it was going to be more than $200. and will more than likely still not get .85-9 volts @WOT. Also there is the better fuel economy that is expected with the newer design of injector. Mods on the engine are; late model intake, extractors, 21/2" straight through exhaust, 62mm throttle body, and airflow snorkel. 1995, OBD1. |
So I ordered the neon injectors, they were $200 Aud delivered.
They came with new o rings, and dropped straight in, clip nuts and electrical connectors went on no worries, took less than and hour to install. I cleared the computer memory by touching the +ve battery terminal to the -ve for 10 seconds or so. Turned the key to on to engage the fuel pump, on mine ('95 )it runs for about 3 seconds then turns off again, so I did it twice more to make sure the fuel rail was purged of air and to check for leaks on the new injectors. Started first pop took it for a drive worked fine, no real noticeable difference other than it "seemed" Smoother. To day will take it for a run and look at the AF ratio at wide open throttle, using the jeeps narrow band oxy sensor, as go jeep explains: http://www.go.jeep-xj.info/HowtoMAPsensor.htm This is the test rig I use, Vacuum gauge and oxy sensor voltage output. http://i641.photobucket.com/albums/u...6122009003.jpg When I replaced the inlet manifold i tapped into the oxy voltage output wire and mounted a easily accessible plug on the inlet manifold to make testing less of a hassle. it is the green wire with the blue heat shrink over a female spade electrical connector on the end. http://i641.photobucket.com/albums/u...6122009002.jpg |
Well, with the new injectors it is .95 / .94 at 4000 rpm and WOT it was about .75 with the old injectors.
This afternoon I pulled the exhaust pipe and will weld in a oxy-sensor bung in front of the cat for a wide band setup tomorrow. See how the numbers from the wide band unit gell with the narrow band & voltmeter technique. Fuel economy numbers will be taking a while |
So with the wide band.
Warm idle AF=13.9 warm Cruse af=14.3 warm acceleration=14.3 warm WOT AF=11.3 Soooooo would seem that it is currently running a wee bit rich. Thease WOT numbers also gell nicely with the narrow band &volt meter wide open throttle numbers. Next I am going to check fuel rail pressure it should be 39psi, and the vehicle was stock as a rock when I got it so not really expecting any surprises there. it has only been a few starts since the memory was reset so I think i Will do another run in a while to see if the other numbers change. As for WOT as far as I see it my choices are: 1. Do nothing it is not a daily driver and you really do not spend much time at WOT 2. Some how get more air into the engine, I believe I have pretty much done all the easy/ economical stuff. next is porting the head, and that is not really ringing my bell. 3. adjust the map sensor voltage input down as described / explained by gojeep: http://www.go.jeep-xj.info/HowtoMAPsensor.htm I am leaning to option 3 as the best way forward(have not really been thinking about it for that long though). Ok anybody got some idears? see something I am missing? |
Word from cherokeeforum is that I have to run it in and let the computer learn the new injectors for a least a while if not the whole 50 starts before I can determine what is going on.
So that is it for now. |
Sweet, good work- keep us posted!
|
ill be running 24lbs injectors when its finised.
|
Sorry but how can you claim power gains with a self adjusting electronic injection?
Duty cycles are only getting shorter with a bigger fuel flow. Provide a lot more airflow to gain any benefits. Power= fuel + air |
Quote:
|
Ah ok, I see the idea behind- just was wondering a bit.
Have been at an injectur guru named Russ Collins (RC engineering). Are Lucas plate disc injectors available? I would use them Those plates have a very quick slew rate. Much better than those Bosch or Nippon pintle style injectors. |
Not to sure about lucas plates, currently using Bosch director plates. to get away from the OEM pintal type injectors. Mostly because of cost, the idea was to get something that was better than stock, but also affordable for stock-ish jeep engines , like; $200 AUD @ your door for 6 injectors. Which any of the above mentioned injectors can be had for, or even less in some cases.
Rather than "the best & hang the expense" approach. Which might be be the path for someone who has just spend big bucks on a stroker rebuild. The limited phone calls I made in Australia about injectors lead me to believe that $200 was not going to go very far and that importing from the states would be more cost effective. That being said vt commodore injectors on post 96 XJs is prolly the cheapest ( 6 reconditioned injectors on ebay for $100) upgrade option out there. |
So just a bit of an update since the Injector replacement, I have done about 1300km and no way have I done 50 starts yet. It is not a daily driver.
So with the wide band. Warm idle AF=13.9 Warm coast AF=13.9 warm Cruse af=14.1 warm acceleration=14.3 warm WOT AF=11.7 So it has not realy changed that much from the initial run. Now the real story here is the fuel consumption. I was getting 16.2l /100km with the stock injectors. I put the new injectors in then about two weeks later I lifted the jeep 4.5" and changed the diff ratios to 4.10 from 3.55. Still have same tires 29". New radiator and 90*c Thermostat to replace the 80*C that was in there. Town and highway driving I am now getting around 12.3l/100km. ******YEAH BOLLOCKS! 14.8 L/100km After you adjust for the diff re-gearing********** Now I do not know where exactly the 4l/100km improvement came from; new Injectors, new Ratios, new hotter thermostat, but I'm very happy with it. I'm not worried about the slightly rich condition at WOT because even driving like a twerp you realy don't spend that much time at WOT. and look at the fuel figures. Will do another run in a couple of months see if anything changes. |
:DThats a whopping 25% increase in fuel efficiency.
It seems that the changed diff ratio does good. Same driving style? |
Same driving style except the "driving like a twerp" phase to realy pin down the WOT AFR numbers.
|
That is a massive increase in economy. Has the ratio change been taken into account. eg. distance measured is no longer accurate. Or are you using some other method for distance measurement? (GPS etc.)
Excellent info by the way. Extremely thorough. Good job there rainman. cheers |
Awwwwwwwww SHIT can not believe I missed that.
THANK YOU FOR YOUR POST brugzz! You are right my spedo is out so my economy numbers are garbage. ......................Standby have to adjust mathematically moving from 3.55 to 4.10 So now it is looking like 14.8L/100km =an improvement but nothing to write home about. |
Maybe driving with a thermostat at 80 deg was making the ECU thinking the engine was still cold and was running it rich until the proper factory temp of 95deg was reached. My engine has high idle until it gets to 80 deg.
|
yeah, you could be right about the thermostat and the cold/ rich fueling.
The theory about cold condition open-loop & enriched fueling happening at temperatures hotter than 70*C in the OBD1 jeeps, was put forward by people using OBD1 engine parameter data readers: http://www.go.jeep-xj.info/HowtoTripC.htm I have not seen any thing that disproves this Thus I subscribe to that line of thought. Carves, Scangauges don't work on OBD 1 Jeeps, and OBD2 jeeps stop cold/ enriched fueling @ around 20*c. agreed, I believe OBD1 is different.: If you have comments pertaining to temperature & enriched fueling post here: http://www.ausjeepoffroad.com/forum/...07#post1064507 This thread is about fuel injectors please keep on track. |
Quote:
|
So have I heard correctly that Commy V6 injectors are an upgrade for the 4.0? If so from what model Commy and are they plug & play?
|
Quote:
Look it up. Bosch injector specifications: http://www.usrallyteam.com/content/p...ector_data.xls Just to be safe would only do it with a post '96=OBD2 XJ. http://i641.photobucket.com/albums/u...injector-1.jpg |
How do us OBD1 owners up our fuel rail pressure????
|
Quote:
and in the tip sheet.............no wrecker option for us as far as I know, have to order from the states~$80 delivered + the Vt bomadorre Injectors. Neon Injectors are the cheapest option for Ausi OBD1 XJ's as far as I know. |
If we were to change the fuel rail to a type that doesn't have the built in regulator is there a "wrecker option" regulator available, does anybody know?
How do the commies and falcons regulate their pressure????? |
How do the commies and falcons regulate their pressure?????
They have fuel pressure regulators on the fuel rail that will not "drop into the jeep fuel rail". The ford one runs the same pressure as the OBD1 jeeps. If we were to change the fuel rail to a type that doesn't have the built in regulator is there a "wrecker option" regulator available, does anybody know? I think that blanking off the back of the fpr void, on the stock OBD1 fuel rail, so the fuel runs straight out of the rail and into a off rail fpr, like what is common in aftermarket turbo applications would be simplest. Don't know of a stock off-raill FPR setup that you get at a wreckers. Would also have to establish the fuel pressure of the off-rail FPR. You could also get an aftermarket adjustable offrail fpr, but for the money & time it would be cheaper just to get the 49PSI Chrysler regulator shipped from the states. |
Quote:
|
So where did you guys buy your neon injectors from, the best price I could get in NZ was $600 EACH!!
|
Quote:
"Handy links: Most of the injectors mentioned above can be bought reconditioned for about $25 usd each, here: http://www.fuelinjector.citymaker.co...ge/5522851.htm Alternatively: http://www.injectorwarehouse.com/index.html" |
Thanks to this thread instead of cleaning my injectors I'm ordering 6 upgraded ones from the US from eBay:
http://cgi.ebay.com.au/ws/eBayISAPI....m=300453462053 There's a video on that page that shows the difference between the stock jeep injectors and the newer Bosch ones, pretty amazing difference. |
I think fuel economy of RAINMAN’s car actually is 10L/100Km to 11L/100Km since speed sensor installed on output shaft of trans.
The reality travel distance is about 13.4% more than displayed on the dashpot since changed the differential ration from 4.10 to 3.55. |
dude there is no way my heap gets that sort of economy.
At the moment it is getting 14.5-15 l/100 km. spedo is right with the 410 ratios & 32" tyres checked against a gps. |
Sorry for the dumb question, but how do i find out what fuel pressure my xj is running?
It is a 96 (Even though a little plate on it says "Built Oct 95) and an OBD1. So it seems to me to be sitting either side of the cutoff that you guys use to work out which one it is. Would i have the higher pressure that would mean the VT commy injectors would be fine? Puk |
an easy way to tell if you are looking at a obd1 jeep is to look for the presence of a fuel pressure regulator on the fuel rail, and 2 fuel lines running into the fuel rail.
OBD2 jeeps have no FPR on the fuel rail and only one fuel line going to the fuel rail. http://i641.photobucket.com/albums/u...Jeep/FPR-1.jpg you can screw a pressure gauge on to the valve (under the black knob hanging off the rail in the picture) to get a pressure reading. |
I was wrong. It is an OBD2.
Thanks for the tip. Puk |
i just installed a set of bosch **703 on a 94 xj according to the post.
then i checked a tune up guaid book. something instresting i found on it. 1994-00 4litre xj fuel system pressure 324-352kpa @idle. that is correct because i checked the fuel rail pressure at school before. that is 350kpa totally within specification. today i used a convertor to translate the kpa unit to psi. 49psi! 1994-00 4.0 litre xj sold in australia is running at 49psi (idle). |
well that is new info, have to go measure mine now.
So that was with the engine at idle and the vac line disconnected? |
Quote:
|
the book called Lubrication and Tune-up Guide
anyway, i want to get an adjustable fuel pressure regulator as i can control the pressure to math any injector fix on it. |
That would be the hesco one?
AGAIN: So that was with the engine at idle and the vac line disconnected? |
| All times are GMT +10. The time now is 08:09 PM. |
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
AJOR © 2002 - 2024 AUSJEEPOFFROAD.COM. All corporate trademarked names and logos are property of their respective owners. Ausjeepoffroad is in no way associated with DaimlerChrysler Corporation or Fiat Jeep.
www.ausjeep.com www.ausjeep.com.au www.midlifemate.com ausjeepforum.com www.r9kustoms.com