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

Car launching for drag racing?

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Old May 28, 2009 | 06:08 AM
  #16  
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Nice trap speed Justin
 
Old May 28, 2009 | 08:06 AM
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Originally Posted by PALETTE
Wes are you running stock Axels?
How are you finding the launch with the RWD conversion?
I have contemplated it but not convienced yet
We are running Drive Shaft Shop upgraded axles, as well as a Guard differential. We went RWD after installing the Guard, with the diff the car definitely seemed to go straighter, still working on the traction issues. With RWD only the R compounds defiantly did not hook as well as AWD, going to try a stickier tire and see if we can't get some better results RWD only.
 
Old May 28, 2009 | 04:10 PM
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Originally Posted by onelove
We are running Drive Shaft Shop upgraded axles, as well as a Guard differential. We went RWD after installing the Guard, with the diff the car definitely seemed to go straighter, still working on the traction issues. With RWD only the R compounds defiantly did not hook as well as AWD, going to try a stickier tire and see if we can't get some better results RWD only.

Wes, Did you guys break axles or was it a preventative measure? Just curious if they did break at what RPM and how? I know cars are different, but this would help me decide how to drive my car at the strip, until I upgrade axles too.
 
Old May 28, 2009 | 04:57 PM
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Originally Posted by ttboost
Wes, Did you guys break axles or was it a preventative measure? Just curious if they did break at what RPM and how? I know cars are different, but this would help me decide how to drive my car at the strip, until I upgrade axles too.

good question. Lets see what comes back

But I know a turbo up here that laid waste to it's axles and it had a launch control at 4400 rpm I think. It also had racing slicks so it hooked while it hopped right in the middle of it's maximum torque (3500-4500) and bam!. I want to do launch control of 4000 rpm, but this is what worries me. that is a huge load on the axles.
 
Old May 28, 2009 | 05:10 PM
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Originally Posted by Prche951
good question. Lets see what comes back

But I know a turbo up here that laid waste to it's axles and it had a launch control at 4400 rpm I think. It also had racing slicks so it hooked while it hopped right in the middle of it's maximum torque (3500-4500) and bam!. I want to do launch control of 4000 rpm, but this is what worries me. that is a huge load on the axles.

My 2 step is set at 4k also. My clutch is not very "slippable" so I am afraid that trying to "slide" it out while flat-footed, I might end up dumping it at 4k and have to push it back in the trailer....
 
Old May 28, 2009 | 05:16 PM
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Originally Posted by ttboost
My 2 step is set at 4k also. My clutch is not very "slippable" so I am afraid that trying to "slide" it out while flat-footed, I might end up dumping it at 4k and have to push it back in the trailer....

my new clutch won't be slippable at all either, so I might consider a lower launch rpm like 3200-3400, just under max torque.
 
Old May 28, 2009 | 05:23 PM
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Originally Posted by Prche951
my new clutch won't be slippable at all either, so I might consider a lower launch rpm like 3200-3400, just under max torque.

Yeah... tried that... 2.0-2.1 60'...slightly less than impressive for ET's but likely won't break anything...got a track rental on 6/12...might be able to hot lap and practice launching...
 
Old May 28, 2009 | 05:30 PM
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Originally Posted by ttboost
Yeah... tried that... 2.0-2.1 60'...slightly less than impressive for ET's but likely won't break anything...got a track rental on 6/12...might be able to hot lap and practice launching...

that 60ft time is about the same as rolling off the line. Well, the best 60ft times I have seen in these cars seems to be 1.6. So half a second lost basically.
 
Old May 28, 2009 | 05:35 PM
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Originally Posted by Prche951
that 60ft time is about the same as rolling off the line. Well, the best 60ft times I have seen in these cars seems to be 1.6. So half a second lost basically.
...which is a full second on the big end..which is about right for my power level...
 
Old May 28, 2009 | 05:41 PM
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Originally Posted by ttboost
...which is a full second on the big end..which is about right for my power level...
what was your et and speed?
 
Old May 28, 2009 | 05:47 PM
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best pass of the day on my 1st time out. (left lane #109) This was a really bad 2-3 shift also, so room for improvement. Timeslip hardly representative of my 60-130...
 
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Old May 28, 2009 | 05:50 PM
  #27  
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Originally Posted by ttboost
best pass of the day on my 1st time out. (left lane #109) This was a really bad 2-3 shift also, so room for improvement. Timeslip hardly representative of my 60-130...

your trap speed kicks ***. So I'd say that you should have been in the high 10's. you are almost at 130 mph. I noticed your 60-130 is incredible.
 
Old May 28, 2009 | 05:53 PM
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Originally Posted by Prche951
your trap speed kicks ***. So I'd say that you should have been in the high 10's. you are almost at 130 mph. I noticed your 60-130 is incredible.

Going back soon. Fixed a couple of things, so I'm gonna try to improve on both ET and MPH. Might try some more 60-130's this weekend.
 
Old May 28, 2009 | 05:57 PM
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Originally Posted by ttboost
Going back soon. Fixed a couple of things, so I'm gonna try to improve on both ET and MPH. Might try some more 60-130's this weekend.

still got your spare in the car? take it out!!!!
 
Old May 28, 2009 | 06:02 PM
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Originally Posted by Prche951
still got your spare in the car? take it out!!!!
Spare tire, jack, tools and compressor come out. Meth kit probably adds 10lbs back in...Still AWD though.
 


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