The stock 996tt first gear ratio of 3.818 provides a top speed of 40.2 mph @ 7000 rpm's. With my current power set up first gear is too short. I am looking at installing a 3.167 which would provide a top speed of 48.4 mph @ 7000 rpm's. The GT2 uses a 3.500 first gear which provides a top speed 43.9 mph @ 7000 rpm's.

I like the idea of the 3.167 gear, however I have some concerns about what it would do to the off the line power along with any starts from a dead stop up an incline.

Has anyone used the 3.167 gear on a 996 or 993 turbo? I intend to also change second.

 

Do you have a lightweight flywheel?

 

He does.

 

im interested in this post too because last time at the strip i wish i oculd just start in seond as first was useless!!

 

I would council conservative change. A higher first gear means
your clutch will do a lot more work from stops, especially on
hills. Your motor certainly has the power to fry clutches all day.
With your current gearing, in a quick standing start, how many
seconds does it take to need to change to first? Obviously not
long, maybe 1.5 - 2 seconds, but if you bumped the gear up,
it would only change to 1.65 - 2.2 seconds so don't expect a
huge difference.
I would think it would be easier to alter the differential ratios
rather than individual gears because, as you say, you're going
to change other gears too, to keep a decent gap between them.
I would suggest bumping the differential ratio by a tooth, to
get them all a little higher.

 

With the tall first gear it will be harder to get smooth street starts with the lightweight flywheel. It should be faster in the 1/4 mile with the taller first gear and a stock weight flywheel. If you're thinking of drag racing you're much more likely to cook the clutch with the tall gears and lighteright flywheel.

 

Joe, I do not know of anyone who makes different differencial R&P's for the 996tt.

 

I am not looking for a dragster, however I would like to maintain decent off the line acceleration along with not experiencing problems on hill starts. The stock first gear (3.818) is definitely too low for my current power. The 3.50 would probably be a better fit. I talked to Paul Guard and he gave me a number for a customer in Cincinatti who installed the 3.167 1st gear earlier this year. I want to get his opinion and was hoping someone on this board has used the 3.167 gear.

 

I am not looking for a drag car as I use mine mainly on the street...I am about ot get a custom clutch kit with single mass flywheel as it was evident last time at the strip that the stock was slipping with all the power