Gearbox determination
10-13-2009, 01:20 PM
#1
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Gearbox determination
I have an 86 944 turbo race car and I recently swapped the transmission to that of an 89 turbo S and was surprised to find that all the gears were longer in the 89 box. I looked at the original gearbox and found an Audi part number 016-301-103 and part of another number: WPO AA 295 4..... Is there any way to find out if the original box in the car was an S2 box or a modified 86 turbo gearbox? I beleive that the gearing ratios for an 86 turbo and an 89 turbo should be identical??
Any help would be much appreciated.
Any help would be much appreciated.
10-13-2009, 02:18 PM
#2
Drifting
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guessing you hae exactly that an s2 box - the number on the case should tell the story......... will see if I can find the link
Yes - clarks garage http://www.clarks-garage.com/
under shop manual, transaxle, information
should be able to ID from that
Yes - clarks garage http://www.clarks-garage.com/
under shop manual, transaxle, information
should be able to ID from that
10-13-2009, 03:42 PM
#3
Rennlist Member
Yes, the 86 and 89T will have the same gearing, stock.
The 86 would have either a 5R or 5P case code (on top of the bellhousing, stamped w/ the numerical mfg date), the 89 would have an AOR. If the box was swapped out for an S2 trans, the case code would be AOS or AOT.
If the 86T had the R/P swapped, you wont be able to tell externally. I suppose you could put the trans in gear and rotate the input shaft by hand, say 15 to 20 full rotations and count how many turns the output axles make and calc the final drive ratio that way.
20 input revs = 1/(r/p) x 1/gear ratio = output axle revs
So for a Turbo r/p in 4th gear: 20 input revs would be 5.7 output shaft revs
For an S2 r/p, it would be 5.0 revs.
The 86 would have either a 5R or 5P case code (on top of the bellhousing, stamped w/ the numerical mfg date), the 89 would have an AOR. If the box was swapped out for an S2 trans, the case code would be AOS or AOT.
If the 86T had the R/P swapped, you wont be able to tell externally. I suppose you could put the trans in gear and rotate the input shaft by hand, say 15 to 20 full rotations and count how many turns the output axles make and calc the final drive ratio that way.
20 input revs = 1/(r/p) x 1/gear ratio = output axle revs
So for a Turbo r/p in 4th gear: 20 input revs would be 5.7 output shaft revs
For an S2 r/p, it would be 5.0 revs.
10-13-2009, 07:36 PM
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Yes, the 86 and 89T will have the same gearing, stock.
The 86 would have either a 5R or 5P case code (on top of the bellhousing, stamped w/ the numerical mfg date), the 89 would have an AOR. If the box was swapped out for an S2 trans, the case code would be AOS or AOT.
If the 86T had the R/P swapped, you wont be able to tell externally. I suppose you could put the trans in gear and rotate the input shaft by hand, say 15 to 20 full rotations and count how many turns the output axles make and calc the final drive ratio that way.
20 input revs = 1/(r/p) x 1/gear ratio = output axle revs
So for a Turbo r/p in 4th gear: 20 input revs would be 5.7 output shaft revs
For an S2 r/p, it would be 5.0 revs.
The 86 would have either a 5R or 5P case code (on top of the bellhousing, stamped w/ the numerical mfg date), the 89 would have an AOR. If the box was swapped out for an S2 trans, the case code would be AOS or AOT.
If the 86T had the R/P swapped, you wont be able to tell externally. I suppose you could put the trans in gear and rotate the input shaft by hand, say 15 to 20 full rotations and count how many turns the output axles make and calc the final drive ratio that way.
20 input revs = 1/(r/p) x 1/gear ratio = output axle revs
So for a Turbo r/p in 4th gear: 20 input revs would be 5.7 output shaft revs
For an S2 r/p, it would be 5.0 revs.
10-13-2009, 07:37 PM
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guessing you hae exactly that an s2 box - the number on the case should tell the story......... will see if I can find the link
Yes - clarks garage http://www.clarks-garage.com/
under shop manual, transaxle, information
should be able to ID from that
Yes - clarks garage http://www.clarks-garage.com/
under shop manual, transaxle, information
should be able to ID from that
11-11-2014, 09:01 AM
#6
Three Wheelin'
So just reviving an old thread so i don't have to make a new one:
I've got a stock S2 gearbox with LSD in it
Am I correct to say the fifth gear has a ratio of 0.778, which is just a little bit higher (and so it's a bit slower on top) than the stock N/A gearbox?
And if so, can anyone help me with calculating the speeds?
I'm running 245/40/17 tyres at the moment.
Thanks!
I've got a stock S2 gearbox with LSD in it
Am I correct to say the fifth gear has a ratio of 0.778, which is just a little bit higher (and so it's a bit slower on top) than the stock N/A gearbox?
And if so, can anyone help me with calculating the speeds?
I'm running 245/40/17 tyres at the moment.
Thanks!
11-12-2014, 12:06 AM
#7
Rennlist Member
So just reviving an old thread so i don't have to make a new one:
I've got a stock S2 gearbox with LSD in it
Am I correct to say the fifth gear has a ratio of 0.778, which is just a little bit higher (and so it's a bit slower on top) than the stock N/A gearbox?
And if so, can anyone help me with calculating the speeds?
I'm running 245/40/17 tyres at the moment.
Thanks!
I've got a stock S2 gearbox with LSD in it
Am I correct to say the fifth gear has a ratio of 0.778, which is just a little bit higher (and so it's a bit slower on top) than the stock N/A gearbox?
And if so, can anyone help me with calculating the speeds?
I'm running 245/40/17 tyres at the moment.
Thanks!
https://rennlist.com/forums/944-turb...l#post11584863
