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ECU changes effecting diff 

 

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Posted: Sun Mar 12, 2006 9:47 pm 
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if it shifts according to speed as data_mine said, then you will need to change them, because otherwise the ECU will shift earlier if Im understanding correctly. because it is seeing a higher speed than what you are actually travelling.



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Posted: Sun Mar 12, 2006 10:12 pm 
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lets just say on a 3.08:1 geared car first gear redline is say 82km/h
when the car is fitted with a 3.08 diff the car speed and the speedo indicated will be the same.

now fit this car with a 3.45:1 diff the car speed is now say 73km/h but the speedo will still read 82km/h because the tailshift speed has not changed.

now do as every one does and fit the correct speedo gear so that car speed matches the speedo indicated speed and the ECU will now only ever be able to see 73km/h at redline. and since it changes on speed not rpm it will never get to the shift point.


so just leave the speedo gear that matches the ECU in the car and there will be no shift point problems.

if you are worried about the speedo being wrong use a frequency converter AFTER the ECU and befor the speedo.

problem solved

 

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Posted: Fri Mar 17, 2006 12:17 am 
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I'm so confused...
What happens if I have an ecu from a car with a 3.08:1 diff ratio... and my car has a 3.23:1 diff ratio??? Because I think the shift points are a lot sooner...
does this sound right?
also, any way around this?
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Posted: Fri Mar 17, 2006 1:01 am 
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tickford_6 wrote:
lets just say on a 3.08:1 geared car first gear redline is say 82km/h
when the car is fitted with a 3.08 diff the car speed and the speedo indicated will be the same.

now fit this car with a 3.45:1 diff the car speed is now say 73km/h but the speedo will still read 82km/h because the tailshift speed has not changed.

now do as every one does and fit the correct speedo gear so that car speed matches the speedo indicated speed and the ECU will now only ever be able to see 73km/h at redline. and since it changes on speed not rpm it will never get to the shift point.


so just leave the speedo gear that matches the ECU in the car and there will be no shift point problems.

if you are worried about the speedo being wrong use a frequency converter AFTER the ECU and befor the speedo.

problem solved




FARRK THAT WAS A MIND BENDER

 

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Posted: Fri Mar 17, 2006 1:05 am 
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so let me get this right

i'm going to put a 3.45 lsd in my gli
with a xr6 ECU
and use a frequency converter

and every thing will be ok ??????

 

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Posted: Fri Mar 17, 2006 2:56 am 
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basically what has been said is you use a frequency converter, but after the ECU, as in for the dash, not for the VSS pin on the ECU.


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Posted: Fri Mar 17, 2006 11:18 am 
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justfordima wrote:
basically what has been said is you use a frequency converter, but after the ECU, as in for the dash, not for the VSS pin on the ECU.


Cheers


So doing that will fix the shift points?
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Posted: Fri Mar 17, 2006 1:58 pm 
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according to tickford_6 and data_mine, it will leave them as standard. without moving them around.


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Posted: Fri Mar 17, 2006 6:59 pm 
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efbignik wrote:
so let me get this right

i'm going to put a 3.45 lsd in my gli
with a xr6 ECU
and use a frequency converter

and every thing will be ok ??????


No because the XR6 Ecu is expecting a speedo gear for your 3.45 diff. You need to get the 3.45 speedo gear too. Forget the frequency converter.

What you said would be right if you were sticking with your gli ecu.

 

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Posted: Fri Mar 17, 2006 8:42 pm 
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efbignik wrote:
so let me get this right

i'm going to put a 3.45 lsd in my gli
with a xr6 ECU
and use a frequency converter

and every thing will be ok ??????



3.45 gears in a gli with an xr6 ecu would need an XR6 speedo gear to get the right shift points and speedo reading

 

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Posted: Fri Mar 17, 2006 8:45 pm 
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ok let make it simple.



match the speedo gear to the ECU, to get the right shift points.
but the speedo reading will be wrong.




if you match the speedo gear to the diff gears the speedo will be right.
but the shift points will be wrong.

 

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Posted: Fri Mar 17, 2006 8:51 pm 
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tickford_6 wrote:
ok let make it simple.



match the speedo gear to the ECU, to get the right shift points.
but the speedo reading will be wrong.




if you match the speedo gear to the diff gears the speedo will be right.
but the shift points will be wrong.


ahhhh thats the kind of explanation I need hehehe Nice and simple. I've been lying in bed for 3 days with a virus.. brain no work :\
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Posted: Sat Mar 18, 2006 12:14 am 
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tickford_6 wrote:
ok let make it simple.



match the speedo gear to the ECU, to get the right shift points.
but the speedo reading will be wrong.




if you match the speedo gear to the diff gears the speedo will be right.
but the shift points will be wrong.


But if everything matches it's all good. ECU, diff, speedo gear. AS is teh case with efbignik, if he gets the right speedo gear, he won't need the freq converter, as the diff and ECU match already.

 

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Posted: Sat Mar 18, 2006 3:11 pm 
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sweet thanks guys thats a big help

 

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Posted: Sat Mar 18, 2006 5:09 pm 
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data_mine wrote:
tickford_6 wrote:
ok let make it simple.



match the speedo gear to the ECU, to get the right shift points.
but the speedo reading will be wrong.




if you match the speedo gear to the diff gears the speedo will be right.
but the shift points will be wrong.


But if everything matches it's all good. ECU, diff, speedo gear. AS is teh case with efbignik, if he gets the right speedo gear, he won't need the freq converter, as the diff and ECU match already.


yeah because in that case the speedo gear is matched to both the diff and ECU

 

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