996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.

who wins 1/4 mile same mods 996tt-997tt why?

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Old Nov 10, 2009 | 09:34 PM
  #16  
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Originally Posted by heavychevy
A more applicable question is who wins with the same hp. The 997 TT wins any drag race in terms of ET. But take a 996 TTS or X-51 (I.E. with K24's) and ECU flash and exhaust vs a 997 TT with just ecu flash and exhaust and the 997 TT will run a faster ET but the 996 TT will trap about the same, both should be putting out about the same power as well assuming stock turbos.

The 996 TT sucks at launching and does not use the front wheels much.

Not just the traction system, but no LSD in the 996 TT either, which hinders acceleration greatly.
997s aren't really running faster E.T'.s overall with the same power as the 996. The 60' times are very similar at least. I do see the 997s sometimes running slightly quicker due to the faster spooling VTGs, but not enough for me to say that they are routinely faster, HP to HP.

Most of the differences come down to the turbos. Most of the modded 997s are using modded VTGs, which are simply a faster spooling turbo compared to K24s and K24 varients. I'd venture to guess that a 996 running VTGs and making the same power as a 997, would run almost the exact same times.

Now if we are talking about TIPs, than the 997 has another advantage with a more advanced slushbox than the 996TT TIP.
 

Last edited by Divexxtreme; Nov 10, 2009 at 09:49 PM.
Old Nov 10, 2009 | 09:36 PM
  #17  
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Originally Posted by Divexxtreme
Stock gearing on all cars. Raised redline on the Proto cars. But it all adds up.

Mark and I could both do 1-shift runs, but because our turbos weren't making full boost until after 60 mph, 2-shift runs resulted in better times then 1-shift runs in our cars.

It's basically a function of lag. With Tym's turbos and tuning combination, Sledgehammer makes a ton of power with very little lag, thus he is well into full boost before 60 mph, which alllows for a optimized 1-shift run.
I'm apologize because my mind doesn't relate to stock turbo gearing. Your motors probably don't hit maximum torque until around 4400 rpm's .... no? Your first gear @ redline is probably max'ed out at 46 mph. So are you starting in second @ what 3000 rpm's? What gear are you starting? At what speed is each shift point?
 

Last edited by cjv; Nov 10, 2009 at 09:49 PM.
Old Nov 10, 2009 | 09:45 PM
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Originally Posted by cjv
I'm apologize because my mind doesn't relate to stock turbo gearing. Your motors probably don't hit maximum torque until around 4400 rpm's .... no? Your first gear @ redline is probably max'ed out at 46 mph. So are you starting in second @ what 3000 rpm's?
Full torque was at 4,800.

I couldn't tell the rpm I started at because I don't remember. Haven't had the car for a while. But normally I'd start in 2nd at around 40 mph, shift into 3rd at around 82 mph, and then into 4th at 115 or so. Each shift cost me 3-4 tenths, not only from the shift time itself, but also the shift recovery.

Tym shifts Sledgehammer once, from 3rd to 4th, at around 105 mph. The car's shift recovery is very fast, so he only loses a total of around .25 seconds on the shift.

One characteristic that I believe my GT2 has with its setup that my TT didn't is a much faster shift recovery, so we'll how much that helps given it's (relatively) low peak HP.
 

Last edited by Divexxtreme; Nov 10, 2009 at 10:00 PM.
Old Nov 10, 2009 | 09:56 PM
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One last thing I want to add is that even though we had more lag, with our raised redlines there was/is still a lot of time under the curve...which made for two very fast cars overall.

They weren't optimized for 60-130 runs as well as maybe they could have been (considering where the boost came in relative to the 60 mph start point)...but, both cars trapped near 150 mph; mine at 148 with GT30s and Mark's at 149 with 35's. I honestly believe my car could have trapped 151-152 with the 35's (I had 60 more rwhp than with the 30s), but unfortunately I never got the chance to prove it.

Coulda', woulda', shoulda'...
 
Old Nov 10, 2009 | 09:58 PM
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Originally Posted by Divexxtreme
Full torque was at 4,800.

I couldn't tell the rpm I started at because I don't remember. Haven't had the car for a while. But normally I'd start in 2nd at around 40 mph, shift into 3rd at around 82 mph, and then into 4th at 115 or so. Each shift cost me 3-4 tenths, not only from the shift time itself, but also the shift recovery.

Tym shifts Sledgehammer once, from 3rd to 4th, at around 105 mph. The car's shift recovery is very fast, so he only loses a total of around .25 seconds on the shift.

One thing that I believe my GT2 has with is setup that my 996TTT didn't is a much faster shift recovery, so we'll how much that helps given it's (relatively) low peak HP.
It is going to be interesting do do a 60 -130 when we get our car on the road. Full boost will be attainable @ appox. 3200 rpm's. First goes to aprox. 78 mph and second to approx. 116 mph. Third will put her well over 130 mph.
 

Last edited by cjv; Nov 10, 2009 at 10:00 PM.
Old Nov 10, 2009 | 10:02 PM
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Originally Posted by cjv
It is going to be interesting do do a 60 -130 when we get our car on the road. Full boost will be attainable @ appox. 3200 rpm's. First goes to aprox. 78 mph and second to approx. 116 mph. Third will put her well over 130 mph.
My opinion?

With traction, a 2nd to 3rd gear run in KA will be strongly into the 3's.
 
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