 |
|
05-10-2013
|
|
Full Flexer
|
|
Join Date: Dec 2011
Location: Geelong
Posts: 1,168 What Jeep do I drive?: JK
Likes: 0
Liked 6 Times in 4 Posts
|
|
My Mud Hogs (285/70R17's) matched up perfect when the Procal was set to 32.5" tyre.
__________________
|
05-10-2013
|
 |
MonsterMoose
|
|
Join Date: Jun 2010
Location: Noosa QLD.
Age: 58
Posts: 7,940 What Jeep do I drive?: WK2
Likes: 1,432
Liked 809 Times in 466 Posts
|
|
I measured across the tyre. I have heard all different ways of measuring! How ever, the amount of air or weight on the tyre will not effect its rolling circumference. If it did then changing from 35 to 28 psi would throw out the speedo too (and the steel belts would have to be able to stretch or shrink).
Just for shits and giggles I measured the circumference of the tyre and calculated the diameter at 32.96 in. Double checked dipswitch settings and all is correct. Will check with AEV their way of measuring the tyre and see what they say.
Sent from my GT-I9300T using Tapatalk 4
__________________
Cheers, Dave :)
2010 JK, then a 2015 KL Trailhawk, now a 2017 GC Trailhawk!
Over 5000 Club
|
05-10-2013
|
|
MonsterMoose
|
|
Join Date: Jun 2010
Location: Noosa QLD.
Age: 58
Posts: 7,940 What Jeep do I drive?: WK2
Likes: 1,432
Liked 809 Times in 466 Posts
|
|
Ok. Just found on the AEV forum a reply from AEV Dave.
You measure from the ground to the top of the tyre with normal inflation and full weight of the vehicle.
I did this and it came to 32 in which is pretty close to the measurement needed to make it work properly. I wonder why they did it this way? This is not a true representation of the tyres rolling diameter which is what the speedo is based on.
Oh well, guess it doesnt really matter as long ong as it works!
Sent from my GT-I9300T using Tapatalk 4
__________________
Cheers, Dave :)
2010 JK, then a 2015 KL Trailhawk, now a 2017 GC Trailhawk!
Over 5000 Club
|
05-10-2013
|
 |
CrawlerStar
|
|
Join Date: May 2010
Location: Perth W.A.
Posts: 303 What Jeep do I drive?: JK
Likes: 0
Liked 0 Times in 0 Posts
|
|
Speedo recalibration
Mine was the same. Just as MM said, I just kept lowering it until it matched the GPS speed. Everything else on the Procal works great.
|
05-10-2013
|
 |
Grumpy Old XJ Dsl Owner
|
|
Join Date: Jan 2011
Location: Northern Victoria
Posts: 13,808 What Jeep do I drive?: XJ
Likes: 4,596
Liked 6,565 Times in 4,348 Posts
|
|
Quote:
Originally Posted by SeaComms
Ok. Just found on the AEV forum a reply from AEV Dave.
You measure from the ground to the top of the tyre with normal inflation and full weight of the vehicle.
I did this and it came to 32 in which is pretty close to the measurement needed to make it work properly. I wonder why they did it this way? This is not a true representation of the tyres rolling diameter which is what the speedo is based on.
Oh well, guess it doesnt really matter as long as it works!
Sent from my GT-I9300T using Tapatalk 4
|
I think you will find it is ! The tyre rubber compresses a bit under the cars weight, but some of this, not all is recovered when rolling.
__________________
98&01XJVMs,06&07KJCRD's,No longer question authority,I annoy it.More effect,less effort.10000Club
|
05-10-2013
|
|
MonsterMoose
|
|
Join Date: Jun 2010
Location: Noosa QLD.
Age: 58
Posts: 7,940 What Jeep do I drive?: WK2
Likes: 1,432
Liked 809 Times in 466 Posts
|
|
|
Uep. It's not that the device is wrong, it's just the method they used for measuring the tyre. What they think is 32 is really 33.
All good, as long as we know how to use it! It's just a shame they dont mention how to measure the tyres in any of their documentation, especially when they use a non standard method.
Sent from my GT-I9300T using Tapatalk 4
__________________
Cheers, Dave :)
2010 JK, then a 2015 KL Trailhawk, now a 2017 GC Trailhawk!
Over 5000 Club
|
05-10-2013
|
 |
Full Flexer
|
|
Join Date: Sep 2006
Posts: 943 What Jeep do I drive?: None
Likes: 0
Liked 0 Times in 0 Posts
|
|
fitting 35"s made my speedo read correctly.... no adjustment needed.. was reading 10k's under previously 
__________________
67CJ Yellow Terror
94XJ The Beast
03WJ RIP
10JK Rubicon
|
| Thread Tools |
Search this Thread |
|
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is On
|
|
|
|
All times are GMT +10. The time now is 02:46 PM.
|
|
|
|
Advertisements
|
|
|
AJOR does not vouch for or warrant the accuracy, completeness
or usefulness of any message, and are not responsible for the contents of any
message. The messages express the views of the author of the message, not necessarily
the views of AJOR or any entity associated with AJOR, nor should any advice
be substituted as technical advice replacing that of a mechanic. You agree,
through your use of this service, that you will not use AJOR to post any material
which is knowingly false and/or defamatory, inaccurate, abusive, vulgar, hateful,
harassing, obscene, profane, sexually oriented, threatening, invasive of a person's
privacy, religious, political or otherwise violative of any law. You agree not to post any copyrighted
material unless the copyright is owned by you or by AJOR. The owner, administrators
and moderators of AJOR reserve the right to delete any message or members for
any or no reason whatsoever. You remain solely responsible for the content of
your messages, and you agree to indemnify and hold harmless AJOR, the administrators,
moderators, and their agents with respect to any claim based upon transmission
of your message(s). The use of profile signatures to intentionally mislead or misdirect any member on this forum is not acceptable and may result in your account being suspended. Any trip that is organised through the AJOR forum is participated
at your own risk. If you or your vehicle is damaged it is your responsibility,
not that of the person that posted the thread, message or topic initiating the
trip, nor the organisers of AJOR or moderators of any specific forum. This forum
and associated website is the property of AJOR. No user data is harvested and no information supplied in your registration will be sold for profit.
|
The Jeep
Trailhawk
