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996tt faster in reverse vs 1st gear?

 
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Old 02-23-2019, 11:40 AM
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996tt faster in reverse vs 1st gear?

I just picked up my 2003 996tt from the shop today, after having the following work done:

1.) Transmission complete rebuild w/ same gear ratios
2.) RS clutch
3.) LMFW Aluminum
4.) BBI clutch slave conversion
5.) 997 short shifter & shifter cables
6.) Semi-solid engine mountsi
7.) Semi-solid transmission mount
8.) New wheel bearings

When I went to drive it, reverse felt a lot faster than before and faster than first gear. I took it back to the shop and sure enough, after my mechanic gave a strange look, he confirmed that the car was 1mph faster in reverse than 1st gear. The guy that rebuilt the transmission was also at the shop and was unable to figure out why this was happening.

Has as anyone experienced this when changing out the dual mass fly wheel? Any thoughts? It just does not make mechanical sense.

Items 4 through 8 are not in question, but included to capture the whole job.
 
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Old 02-23-2019, 06:56 PM
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Reverse gear (2.857:1) is taller than first (3.818:1) in all the 996 transmissions. ( ) indicate ratios in the G50 used in all 996 Turbos. So reverse will naturally yield a higher top speed.
 
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Old 02-24-2019, 05:31 AM
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Originally Posted by nick49 View Post
Reverse gear (2.857:1) is taller than first (3.818:1) in all the 996 transmissions. ( ) indicate ratios in the G50 used in all 996 Turbos. So reverse will naturally yield a higher top speed.
Well that would explain it. I thought reverse and 1st used the same gear? I guess I was wrong...

thanks!
 
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Old 02-24-2019, 05:33 AM
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Originally Posted by nick49 View Post
Reverse gear (2.857:1) is taller than first (3.818:1) in all the 996 transmissions. ( ) indicate ratios in the G50 used in all 996 Turbos. So reverse will naturally yield a higher top speed.
^this... common practice in all cars AFAIK
 
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Old 02-24-2019, 10:16 AM
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Originally Posted by 993GT View Post

^this... common practice in all cars AFAIK
To clarify, are you saying common practice for cars to use these gear ratios or reverse using first gear?
 
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Old 02-24-2019, 11:43 AM
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taller in reverse.
 
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Old 02-24-2019, 03:38 PM
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reverse is always taller than first
Originally Posted by SonicSound View Post


To clarify, are you saying common practice for cars to use these gear ratios or reverse using first gear?
 
 
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