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xr diff gears 

 

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 Post subject: xr diff gears
Posted: Fri Oct 13, 2006 8:14 pm 
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hey guys i just fitted xr 3.45 diff gears into my ef falcon gli, i also fitted the appropriate ford speedo gear, now the auto hits rev limiter once or twice when changing into 2nd and same into 3rd in economy mode, if i put it into power it just bounces off rev limiter until i back off then it changes into2nd same again with 3rd, anyone have an idea as to wot the hell is goin on with my car????????? :twisted:

 

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Posted: Sat Oct 14, 2006 12:56 am 
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A search will reveal the following important factor.

The ECU uses speedo signal not rpm to determine shift points. You are now turning more rpm for a given speed & the speed signal is correct to the road, but the ECU is not aware of the extra rpm.

 

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Posted: Sat Oct 14, 2006 1:25 am 
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yep...u need an xr or fairmont ghia ecu, i had the same thing, now ive got a ghia ecu the revsw dont hang and it changes b4 the rev limiter

 

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Posted: Sat Oct 14, 2006 12:32 pm 
Tyre Shredder
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Or as others have done, put the original sender gear back in the tranny & use a Jaycar speedo corrector for the dashboard signal only. The shift points will return to normal rpm & you will still know how fast you are going.

 

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 Post subject: xr diff gears
Posted: Wed Oct 18, 2006 5:47 pm 
Stock as a Rock
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thanks i think i will look for an xr or fairmont computer and see how i go :twisted:

 

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Posted: Fri Oct 20, 2006 7:22 pm 
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can the original sender gear from the car that had the 3.45 diff be put into the car that the diff has been fitted to to correct the problem? Or does the ECU still need to be changed too?
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Posted: Sat Oct 21, 2006 3:03 pm 
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ELV8 wrote:
can the original sender gear from the car that had the 3.45 diff be put into the car that the diff has been fitted to to correct the problem? Or does the ECU still need to be changed too?


As far as I can tell, that is what was done & that is what mucked up the shift points. I think I've already explained why :wink:

 

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Posted: Sun Oct 22, 2006 6:07 pm 
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Ahh I understand now. I am going to do the same diff conversion but being an ex-chaser I can calibrate the speedo to suit!
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Posted: Mon Oct 30, 2006 12:55 am 
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BTW, where is the speedo gear on the gearbox, is it the round 2 pin plug on the passenger side? Any trick to taking them out/changing them?
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