964RS_NGT

Anyone knows, or have documentaion showing what gear ratios for each gear that are (or where) available from Porsche for the 05-12 cup cars?

Also interested in knowing what gears they came with from factory (including any changes that eventually were made during the years).

Thanks.

lordpantsington

'06-07 G97/60
Crown wheel and pinion 8/32 4.000
1st gear 12/38 3.167
2nd gear 15/32 2.133
3rd gear 18/31 1.722
4th gear 20/28 1.400
5th gear 26/30 1.154
6th gear 28/27 0.964

'08-09, '11-12 G97/63
Crown wheel and pinion 8/32 4.000
1st gear 12/38 3.167
2nd gear 15/32 2.133
3rd gear 18/31 1.722
4th gear 20/28 1.400
5th gear 23/26 1.130
6th gear 29/27 0.931

'10 G97/63
Crown wheel & pinion 8/32 4.000
1st gear 12/38 3.167
2nd gear 15/32 2.133
3rd gear 18/31 1.722
4th gear 23/31 1.348
5th gear 26/29 1.115
6th gear 29/27 0.931

amso3

This is what I had in a file, not sure of the source:

964RS_NGT

Thanks!

GTgears

Don't buy any of those 08-09 part numbers ever. Those are the skinny skinny gears. Stick yo 2010 width or newer. 2010 is fine but 2012 is even wider.

lordpantsington

Hadn't thought of that when I copy and pasted, edited post to hopefully prevent steering someone to a less than ideal situation.

GTgears

Not sure they are even readily available anymore but every once in a while I get a call from someone who hasn't updated which floors me since those 3rd gears rarely survive more then 20-25 hours.

964RS_NGT

Good piece of info, thanks!

I assume Porsche made other ratios as well, anyone have documentation of that?

GTgears

The 997.2 RSR got a new gearbox manufactured by ****. When that came out demand for alternative ratios dropped way off because almost everyone was running GT3 Cup/Carrera Cup with the sealed gearbox and spec ratios. All the Grand Am and ALMS cars got converted over to the new gearbox if the car was competitive and with a well funded program. Stock as delivered became the flavor of the day.

What is the underlying reason for the request? If I had a bit more information I might be able to offer more help.

cid042

Hi Matt,

What do you think about the weakness of the 3rd gear in Cup S ratio ? (19:34) Is it better than the standard cup ?

Thanks in advance,

Cedric

GTgears

The Cup S is still the Holinger gearbox? If so it's no stronger. How weak the 3rds are is determined by the shaft centers and how small one must manufacture the idler gear. The 2012 wide gears are marginally stronger because of the added width but they aren't any thicker.