hi guys, my engine is all out..camshaft damage but fixed...

changing out tranny stuff again....getting conflicting info on ring and Pinion..change out...to 8:32 ..

at sebring any personal experience of actual drop in laptimes....?

thanks!

mike

 

or any other tracks?

mk

 

Why not regear? Mike

 

Can only say that driving a 996 Cup with the shorter gear ratio's is a blast. Finally using all the gears.

 

Mike

Only way to go is regear and the cost is about the same. RP still leaves the large rpm drop between gears and the 8:32 is a high wear item. If you want to scare the DEcup drivers regear. That will be my next TSB.

Peter

 

I would re-gear unless doing autoX.. where you need to drop the ratio on the 2nd gear.. !

 

Hey there Mike,

If you can give me the year and model ie turbo GT2 GT3 etc. I can work up some gearing charts for you.

I would say that regearing is probably the best option here, as the 8:32 ring and pinion does not tend to last too long. There are some aftermarket rings out there that will be a bit better than the OEM.

There are a ton of gearing options out there though so you can really fine tune the gearbox to what you are wanting it to do.

Happy Thanksgiving

Erik Johnson
GBox LLC
(303) 440-8899 work

 

thanks guys

talked to one guy on west coast that has done RP then later regear and regear was 1.5 sec slower obviously depends on track...also heard, unless you regear second (huge expense) you are still left with the long second gear....a very reputable porsche engine builder recommended to leave it stock and he builds porsche race cars, cup cars etc for fl tracks......
but i kinda wanna do it...just need more slippery comments and i'll do it..engine is apart now...)


Erik

have 2004 996 gt3 mk 2
thanks!

mike

 

Yes, the 2nd gear will still be very tall, although most tracks that I go to don't use 2nd much (if any)! Hence my comment about autoX!

Have you thought about going w/ the 8:33 setup instead of 8:32 so it is not evenly divisible?

 

Is the even 1:4 ratio the reason for the higher wear? I never heard that before...

I've always preferred a custom gear stack to an R&P change...

 

1:4 ratio would be worse for wear on the ring and pinion unit, since you are always hitting the same teeth.. but in general, there's more wear and tear when you are gearing it down anyway, as everything spins more in the gearbox..

8:33 has an even higher ratio (from 4 to 4.125), but does not have the issue w/ hitting the same teeth every 4 revolutions.

I am sure the experts (GTgear, GBox, etc.) can comment on it more than me.

 

I had my tranny shipped over to Copans for the 8:32 r/p. In hindsite woulda done the regear and r/p. I never use 2nd gear at any of the tracks with the r/p. Does feel great having more accessible trq. My 3rd gear pulls like my 2nd gear. Technical tracks it's pretty awesome. Mike

 

Your comment is why I always scratch my head when people say that 2nd is still too tall after the r/p swap. A 996 Cup Car ran a 2.00 2nd gear with 4.00 ring and pinion. A 996 GT3 street car runs a 2.15 2nd gear. The street car is already shorter in 2nd after a ring and pinion swap than a factory Cup, but it is too tall?

In recent years, the big improvements have been in 3rd, 4th and 5th gear on the 997 GT3 versus 996.

996 is 1.56, 1.22, and 1.00
997 is 1.63, 1.29, and 1.06

They have pulled the whole stack down on the 997s. They also gave it a 2.27 2nd gear, which I feel is the weak link in the equation, versus the 2.15 of the 996

ps. A 997 Cup runs a 2.13 2nd gear.

 

So I think I have a pretty good setup for you here. Push your 5th gear into the 6th gear position, which is a 1.0 ratio gear set. Then get the 1.31 gear set for your 4th gear and 1.1333 for your 5th gear and I think you will be golden.

Send me your email address and I will send you the chart. These two gears are available from Porsche Motorsport, so please no flames from anyone saying I am trying to sell anything here. LOL

Just trying to be helpful. Let me know what you think on this.

Erik Johnson

 

So Matt, the 997.1 GT3 have a shorter 2nd gear compared to the 996? That would be an advantage at autoX for sure..