Today I checked the xj repair manual. It said 94 xj fuel rail pressure should be 31psi with vacuum line connected and 39psi without vacuum line connected. At idle.

That is what my 95 FSM says also....

sorry to bring this back from the dead..

in the search to rule out the injectors for my rough idle (see my little miss, big miss thread) i put in VR commodore injectors today.

didn't get rid of the pre-existing idle problem, but everywhere else (to redline) the response is crisper and seems more willing on accelleration. on will report economy later

these have the 4 very fine holes as opposed to 1 that the stock ones have, so even though they flow less than stock, they support the same or higher KW rating because more of the fuel is efficiently burned.

happy so far

now to rid the misfire..

Yours is obd2 right?

yessir,

it was plug n play

I now fulfill my promise.

now that my ignition issues are sorted, i can now make a better assessment of the commodore injectors.

Much more response (snappier) very crisp throttle, less tendancy to downshift (happier to hold a steeper gear longer)

has nulled the negative effects of going to 31's (opinion)

measured 5-6% l/100k gain (do same k's each week and measured ltrs when refuelling) all city.

considering i scored the injectors for free, and there is measured mpg and subjective driveability gain, i say go for it!

did you use vr v6 injectors or v8 injectors ?
cheers dazza

v6

first glance it looks like it wont fit (different lookin) but crucial dimensions are identical and fits like a glove.

sorry to bring this post back from the dead but i just want to see if you are still happy with the injector upgrade as thinking of doing it my self cheers daz

still happy with it.

as i said, i got back my economy that i lost going to 31's as it waits later to downshift. no flatspots. doesn't take long to do at all:cool:

i'm still happy with the neon injectors.

ok cool just out of interest i have a 96 obd2 high output which ones would be the pick from vr to vt injectors i am leaning towards the vt
cheers daz

anything with 0280155777 cast into the side of it.

thanks mate

ok so i have fitted model number 0280155777 injectors from a vx comodore and so far i am pleased driver seat testing it seams to have a smother accelation quicker pick up smother idle and gereraly beter in every way so the test test will be fuel consuption will get back to you all

i will say this it is all plug and play no other mods needed (they look so differant but fits like a glove)
but i did have a win mine is obd2 so fuel presure is all ready the 50 psi needed i have been told (i did test mine just to make sure)
cheers daz

so as promised the economy is a bit beter like about 40 ks extra out of the tank
but the best bit is it has so much more pulling power now unbeleaveable it has basicly nulled all my mods and it like drivein a stock xj again holds gears much beter as your powering up a hill i will never go back to the standard injectors again(any body thinkin of this mod do it you wont look back)
cheers daz

Great to hear Dazza.

How do obd1 owners jazz up their fuel regualors?

in the first post.

Yeah i am really glad i did mine, too.

With the cruise control on at 100 i could pick within 100metres the places where it would have to drop back a gear on the Warrego near the crest of some hills.

First time after the plug 'n play injector swap we sailed over the top of both hills without dropping back. Picks up a lot quicker, too.

Puk.

validation is a sweet sweet nectar:cool:

supercharged injectors?
 

Hey xjers,
I went on ebay and saw common commodore injectors are about $150 but ones for the supercharged version were about $450. If money was no object would these be even better?
Keeping in mind that a s/charger may be fitted to the xj in the future....

no.
have a carfull read of the first post.
after the cost of a supercharger kit the bigger injectors will be chicken feed.
if you have a bit of extra cash for injectors try. 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.
and do report back.

This injector upgrade sounds good. Can anyone confirm if the better spray pattern has helped with the pinging when using the lower octaine fuels??

cheers

Can't help you on that one sorry.
Mine never pinged. Pung? Ponged?

It would be interesting to find out if it has helped anyone with that.
Puk

funny you should ask the whole reason i did the injector upgrade to mine was because of pinging for some unknown reason mine would ping randomly normaly hot days and on the hiway as i was heading up a hill i tryed all the soulutions tbs msd extracactors snokel cold air intake tube over the big box intake the injectors was the fix for me

now i used the 6 cyl commy injectors yes they flow a bit less but with the better spay pattern less is more if you know what i mean i can do a burn out now just takeing off with no brake and pedal flat to the floor no pinging any more what so ever even with the ac on it 100 percent fixed my pinging
cheers daz
(pinging sounds like 100 screws rattleing around in a bagless dyson vachum cleaner )

To be politically correct the word is 'PINK'........to undergo pre-ignition or to knock.

I thought they were all used interchangeably? I remember reading "Pinking" on the Optimax ads years ago and thinking they had made a typo, but sure enough pinking is also used.

i love the "100" screws analogy, is it Dyson specific? have you actually put 100 screws into a dyson? :lol:

seriously, i wonder why some xj's ping and some don't. heat? diff in comp ratio? cam differences?

no i havent put screws in the dyson and i dont even own a dyson i got a bagless hoover mines ahead of the rest haha but serously it is the closes sound i could come up with bird seed sounds very simlar as well:D

i got to the point where i had taken all mods of the engine to no aval if i had to put money on it i think it was my own doing by running a snokel the tube intake extractors hi flow cat and muff basily i think i freed up the motor to much and injector couldnt cope with the flow ?

but any way i got to the point where i was looking at the wife dunnydore same mods yes no snokel it has a big mouth cold intake instead UNDER THE BONNET for all you smart arses out there but point was it didnt ping thats why i gave the injectors ago but now the jeeps not pinging its go some get up and go now never been this good and beter on fuel to

cheers daz

There is no way i would "knock" PINK in a million years. I can't stand that loudmouth pain in the butt.

Besides, i think it might actually be a man.

Hey rainman, thanks for replying, do you mean 5L engine? Those models came with a 5L, the gen3 was a 5.7, it came out on the series2 vt.

no I mean the VR, VS AND VT SERIES 1, 5.7L V8 that came in the HSV models, Senator (5.7 L 215i Model) &GTS.
Do not get to court up in the the car models to much, it is all about the part number cast into the side of the injector, that is what matters. Colour to a lesser extent, bright freakn orange in this case, will make it easier.
they are on ebay.

done the exchange for a set of VX injectors. There are many different types you can use including au xr6 and any typical falcon that has fuel injection and a 6 cylinder.

naturally the 4 hole forces fuel in a spray allowing air vapours to ignite fuel more efficiently, instead of a stream of solid fuel that won't ignite as good!!!

Hence more power with less foot throttle

FYI The 5.7 litre V8 that HSV used back then was often referred to as the 'stroker engine'

pre ignition can be caused by incorrect plug gaps. I always check and adjust with feeler guages

Im convinced....ordered mine today through EBAY.

Will let you all know how they go.

what did you order?

Remanufactured Holden VT VX VY V6 Bosch Fuel Injectors

$119 plus $12 freight.

Hopefully they work ok

hey guys...how do you remove the electrical connectors from the injectors??

thanks in advance

just pull off.
there used to be a clip for replacing the jeep injectors on utube.XJ/TJ ZJ are all the same.