Hi all, I need to change the axle ratio code in engine and trans for a VR V8 auto. The calculation is
(tyre rev's per km X diff ratio)/.0352
(From memory I think that's the division number)
I calculate the info and get a large number in the 10s of thousands.
The number currently is 0.0232 in the axle code.
I'm not sure what I'm doing wrong.
Tyres are 235/45/17 and 3.45 diff gears. This is the ratio I need to update it to.
Then after that I will work out shift point adjustments.
Thanks guys.
Axle ratio change in VR V8 auto
- antus
- Site Admin
- Posts: 8292
- Joined: Sat Feb 28, 2009 8:34 pm
- cars: TX Gemini 2L Twincam
TX Gemini SR20 18psi
Datsun 1200 Ute
Subaru Blitzen '06 EZ30 4th gen, 3.0R Spec B - Contact:
Re: Axle ratio change in VR V8 auto
try applying it as a percentage change from stock. So say your ratio is 10% larger than stock then revolutions are 10% less, so multiply the existing value by 0.90, or if the ratio is 10% less multiply the value by 1.10 etc.
Have you read the FAQ? For lots of information and links to significant threads see here: http://pcmhacking.net/forums/viewtopic.php?f=7&t=1396