hit 145 in 4th with more room at the top was very surprised when i saw speedo.. felt like 100...what does this equite to in terms of top speed????????

 

Steve,

A wrong speedo.

You should be hitting around 130mph or so in 4th. if you have a TT with stock redline and tire sizes...

 

I agree with Jean. at the 1/4 track I trappped 126 mph with a few hundred rpms left. strange...

 

this is the correct info from an expert on rennlist... something is wrong with you or the car IMHO unless you have changed factory gears, ring pinion or tire sizes

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1st - 39
2nd - 73
3rd - 106
4th - 133
5th - 162
6th- 195

All at 6750 rpm except for 6th which is at 6600 rpm.

 

Well i have the raised limiter to 7k-7100 and just watched a speedo video from 40 mph in 2nd to top of 4th and it hit about 139-141mph by 7k flat, cant really see the number but looks to be about 140 maybe a little more!!

 

Are you familiar with the turnzero gear calculator. They have a 996 setup. Just click the variables for a vehicle and pick the one you want.
If you change the final drive, tranny gears, tire size, etc you can plug in the changes and bingo.

www.turnzero.com/technical_resources.php?resource=gear_calculator

 

Tom
Those speeds are for the 996GT2, it has same gearing but taller tires, the TT reaches slightly lower speeds at same RPMs.

ILLM3

At 7-7.1K RPM you will see about 4mph more, 134mph or so.

Sideways, nice link! The gearing shown is for a 996 Carrera, in 4th gear the TT and GT2 have a ratio of 1.12 whereas the Carrera has a shorter 1.22. So it needs to be changed on the software as you said.

 

Interesting, like i said i see about 139-140 in the video, i can host it if you would like to see, this was on ROW suspension, stock wheels and tires!

 

ILLM 3

It is normal to have that sort of speedo inaccuracy. It is actually little!

 

time to buy yourself an AZ-22 and see your real speeds.

MK

 

thanks Jean

 

The tt speedo reads about 4-5 mph high.

 

Is nonlinear,always reads higher at the top. Jean knows as do others that have spent a lot of time going fast. A GPS with high gain antenna is easy to use for verification.


Cheers

R