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Why do my gears change at 4krpm 

 

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 Post subject: Why do my gears change at 4krpm
Posted: Thu Feb 01, 2007 7:58 pm 
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Ok i was driving home. had it in power and gunned it - foot completely flat
but the gear changed from 1st to second only at 4000rpm, why is it changing this early ie not at the rev limiter??

Ben

 

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Posted: Thu Feb 01, 2007 8:01 pm 
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That might be how the auto ECU side of it is set up.

 

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Posted: Thu Feb 01, 2007 8:20 pm 
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mine changes at 5k, im guessing the ecu or auto box is playing up
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Posted: Thu Feb 01, 2007 8:28 pm 
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that means mines playing up bigg time ... mine changes just before the rev limiter . sometimes it hits it .... that aint normal is it??

 

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Posted: Thu Feb 01, 2007 8:28 pm 
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i got a diff tourq converter put on when i change engines cause the mech couldnt get the other one off my old 3.9. there seems to be a slight hesitation changing 1st to 2nd ie the change takes a bit longer.

 

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Posted: Thu Feb 01, 2007 8:40 pm 
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i am taking it that it never did that before hand ... casue if it didnt .. id be saying that its the tourque converter

 

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Posted: Thu Feb 01, 2007 8:48 pm 
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but it is a diff engine so it could be alot of things but ive never felt that hesitation. its only when im accelrating slow

 

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Posted: Thu Feb 01, 2007 8:52 pm 
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what motor did u change it to ??

 

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Posted: Thu Feb 01, 2007 9:20 pm 
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is it in economy mode??

 

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Posted: Thu Feb 01, 2007 9:49 pm 
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SlickNCGhia, check throttle cable isn't stretched, get someone to go in the engine bay, you hold it flat stick, and see if they can move it more.

To others, non stock ratio diffs, combined with you putting in the correct speedo sender gear, will f**k your shifts unless you put in an ECU from a car that had your new diff ratio.
Or if you feed the ECU a corrected signal, ie Jaycar Speedo Corrector.
The autos shift of speedo sender signal (simple example - at WOT shift at 79km/h).
Or alternatively your trans is just slipping like a b**ch, get it serviced and hope it aint dead.

 

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Posted: Fri Feb 02, 2007 10:14 am 
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steadyED what about just putting in the relevant speedo gear ? seems much easier. and slick, yeah check for full throttle and that the tps works properly.

 

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Posted: Fri Feb 02, 2007 11:29 am 
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You either have a speedo thats out, and an auto that shifts right, or a speedo thats right, and an auto that bounces off the limiter before it shifts to 2nd at WOT.
If you want to do it without an ECU for your revised diff ratio, you need a way to modify the speedo signal.

 

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Posted: Fri Feb 02, 2007 12:14 pm 
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i put a 3.45 lsd in my fairmont that just had a standard open centre 3.08 or some s**t like that i think and mine still shifts at 5.500rpm where it did before i swapped

 

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Posted: Fri Feb 02, 2007 12:18 pm 
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my ED will change just at redline only when it's in power mode, in economy, it shifts quite a bit before that.

in the ford 6, there's no point in letting it go all the way out til redline at 5, since maximum power is made at 4500rpm, any time spent reaching after that is completely wasted, ideally, you should be shifting at 4500, but you can really only get that in a manual so yeah.

 

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Posted: Fri Feb 02, 2007 12:22 pm 
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I'm going with stretched accelerator cable, try replacing or adjusting it

 

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