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 Post subject: What would happen IF...
Posted: Thu Nov 16, 2006 8:08 pm 
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What would happen if I fitted a ECU calibrated for a 3.08 diff into a car with a 3.23 diff, would this make the shifts happen higher or lower in the rev range?

I can't work it out :oops:

 

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Posted: Thu Nov 16, 2006 8:34 pm 
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If your ecu is for a 3.08 diff and you put it in a car with a 3.23 diff, the shifts will occur at higher rpm than they would with a 3.23 ecu.
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Posted: Thu Nov 16, 2006 8:37 pm 
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I'd vote for higher as well.
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Posted: Thu Nov 16, 2006 9:45 pm 
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nothign would happen at all!! shifts would be the same!!!

the ecu gets one of many signals from the spedo sender

unless u change the spedo sender gear to a 3.23 gear the shifts will be the same!

 

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Posted: Thu Nov 16, 2006 10:02 pm 
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Car with 3.08 diff, 3.08 sender and 3.08 ECU shifts 1st to 2nd at 80km/h indicated (none of this is anywhere near exact, its random exampleness).
Car with 3.23 diff, 3.08 sender and 3.08 ECU STILL shifts at an INDICATED 80km/h, actual speed being 70km/h
Car with 3.23 diff, 3.08 sender and 3.32 ECU, will shift at an INDICATED 70km/h, actual speed being 60.

EDIT: just noticed you are going the other way, 3.08 ECU into car with 3.23 diff... I should read posts...
same principals apply sorta, I'll put that example in there :P

car with 3.23 diff, 3.23 sender, and 3.08 ecu, will shift at an INDICATED 80km/h, actual speed, 80kmh :P
much too late for the 3.23 diff!!!

 

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Posted: Thu Nov 16, 2006 10:16 pm 
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Franks spot on, and its a useful post, no whoring lol.
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Posted: Thu Nov 16, 2006 10:27 pm 
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bowsaw wrote:
Franks spot on, and its a useful post, no whoring lol.


thanks neil

 

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Posted: Thu Nov 16, 2006 11:07 pm 
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basically, if you put your foot to the floor, it will hit the limiter.

 

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Posted: Thu Nov 16, 2006 11:15 pm 
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Steady ED wrote:
car with 3.23 diff, 3.23 sender, and 3.08 ecu, will shift at an INDICATED 80km/h, actual speed, 80kmh :P
much too late for the 3.23 diff!!!

thats where my 'mont used to change...3.23 ECU, 3.23 Diff and 3.23 Sender. now it changes at like 40/50 tho...something to do with the extra gear...and third pedal

 

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Posted: Fri Nov 17, 2006 9:09 am 
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Just to confirm, I had no issue driving around with a Tickford ECU (3.45 diff ratio) in the wagon which is factory fitted with something lower...

 

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