This would be assuming that you have never run out of gear in 5th, if you have at a given track then I would recommend that you simply get the new 997 GT3 RS ring and pinion which works really well with your stock gearing and would give you about 6 more MPH to work with in 6th gear.

Just another option for you to consider. I don't know of too many tracks that people are hitting over 175 on though, at least not for extended periods of time. (anyone have a different experience with this?)

 

Yep. Both the 997.1 and 997.2 use the same mainshaft with 3.818 1st and 2.266 2nd gear.

I personally have started selling GT3 owners into the 996 Turbo mainshaft when they don't want to spend the Texa$ for one of my kits. I think the 3.818 1st with 2.056 2nd is better for the track in general and has the added bonus that Porsche will sell you a replacement 2nd gear idler. They don't do that on the GT3 mainshaft kit and make you buy an all new 1st and 2nd gearkit with mainshaft.

But the auto-x market is totally different. We sell a lot of our mainshafts with slip fit 2nd gears specifically for the serious auto-x guys. They are always looking at the 2.375 2nd gearsets for auto-x and mate it to something like a 1.68 or 1.75 3rd gear to optimize their conebashing times.

 

The old stock 5th gear in 6th position stack works well when someone either doesn't want to spend the extra money for an all new 6th gear ratio or when they drive their car to and from the track on the interstate instead of trailer it and need to control highway cruising rpms.

About the only track in the country whe the stock 5th gear would be maximized is Daytona. Otherwise, Sebring, Road America, VIR, Road Atlanta, and any other fast track, a 996 GT3 will not break 170mph. The stock 5th gear is too tall from an optimized gear standpoint. It is good, but not best.

 

Hey there Matt,

Did you take a look at the 1.0 in 6th gear on a chart when put behind the 1.1333 that I also recommended? It is done at 174 with the normal 7500 RPM redline and only has a 882 RPM drop from 5th. I am not sure how you get too much more optimized than that, but you make a good point for sure. I like this option because it is pretty cost effective and ends with a pretty nicely geared gearbox.

To each their own however, as every driver has a slightly different requirement, as I am sure you will agree.

Have a great Thanksgiving by the way, I hope that things are going well for you and that you are still enjoying your new Subaru.

Erik

 

erik

my email is mkk62@embarqmail.com

please send me those recomended gears and will run it by the shop....

thanks again...

while everything is open its hard not to want to upgrade something

mike

 

Hey there Mike,

You have mail. Let me know what you think.

Erik

 

Hello Erik,

While the GT3 has a redline in excess of 8000rpm, that's not what I was talking about with respect to optimization. What I was referring to was the fact that nowhere other than Daytona will the car break 170mph, so having gearing that will go faster than that is too tall and not optimized. From an acceleration and efficiency standpoint it is faster (with respect to lap time) to have a lower top end than the stock 5th gear provides. However, I also provided the alternative reasons why many people choose to retain the stock 5th in 6th position versus replacing it.

Personally, I think the 1.31 4th and 1.13 5th option is too tall still. 880rpm drop is too tight for the 5 to 6 shift, if one is retaining the stock 5th as 6th. I prefer a 1.16 or 1.174 5th gear and a 1.36 or 1.33 4th gear instead. That would be coupled with a 1.63 or 1.65 3rd gear instead of the stock 1.56 3rd gear. But like you said, to each their own.

Regards,

Matt

 

deleted. just do whatever matt tells you to do, then you are good

 

Wondering if anyone has real lap time improvement from either re gear or r pinion. Although everyone loves this mod I haven't seen specific 6-3 people talk about drop in lap times with either mod?
Thx

 

Mike

I'm waiting for you to be my 6GT3 Sebring test mule. I do know on my old E46M3 going from 3:64 to 4:10 rear gears was worth over a sec a lap at Sebring.

Now for the potential downside. At Roebling last month I was hitting rev limiter in 4th before braking. So I tried slightly short shifting into 5th at 7800. Did one session staying in 4th and one session shifting to 5th. Using trakmate data the terminal speed before braking was the same 145mph but I lost .4 sec in that segment with the shift to 5th. With regear, will the added acceleration be enough to out weigh the time lost shifting.

My gut tells me the shorter 3/4/5 will be faster but it will depend on the track.

ps I like my tall 2nd gear.

Peter

 

I asked this before and also found it very hard to find documented lap times for before and after, I think it's very much track dependent as well. Chuck Price did have great first hand data from doing a re-gear on his old 993 at my home track (Mid Ohio) which was impressive...like a couple seconds a lap if I remember correctly.

 

Just use stock gearing. Mkk62 will be slow regardless of what he dumps in the tranny

If you must, listen to Matt. Good guy, knows his stuff.

 

Mike, I re-geared for this season and my track results were not improved from previous seasons. Cal speedway was the only place where I did see improvement. I still plan to work with them and try different driving technice see if that helps but would not go this route again, it may work better with R/P.
Mike

 

Thx. That is what I am hearing. Not a lot of data on improvement in lap times

Others with lap times before and after ?

Mike

 

Surprised to hear not many claiming better lap time due to re-gear.. also didn't make sense about R&P being better than re-gear.. (if re-gear correctly, it would be just like R&P change, AND some more..)