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

10.11 sec.@ 142.46 mph(getting closer)

Old Mar 12, 2007 | 03:18 PM
  #76  
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Originally Posted by MARKSKI
Even though we did Ok I still do not think GT35rs are optimal for the track. As a matter of fact I know that Bobby ( who has run 9s in his 993TT) has extensive knowledge and according to him a gt30r with a 76 mm compressor would be the the way to go as far as 1/4 times...
mark
Markski,

I am stiill agonizing over which turbo's to us. I feel the 30's would be better for the track and the 35's for the quarter. With a 9000 rpm 3.95L motor I believe the 30's would run out of breath above 7600 rpm's.

Am I wrong in my assumptions.
 
Old Mar 12, 2007 | 03:22 PM
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u just might be right..... Bobby know his Sh2t... u guy should talk...
 
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Old Mar 12, 2007 | 03:23 PM
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Originally Posted by MARKSKI
u just might be right..... Bobby know his Sh2t... u guy should talk...
How do I contact him?
 
Old Mar 12, 2007 | 03:24 PM
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Originally Posted by MARKSKI
I have all solid subframe mounts... including all upper and lower control arms... so we dont have wheel hop... something else is breaking these axles... probably a design defect. We actually ran all three runs on stock axles... then those popped too. we knew it was going to happen....
thanks for the support.
mark
I wasn't talking about wheel hop, I was talking about delfection. However, if you have all solid mounts then I don't see deflection being a problem either. Is it the axle, or the CV's breaking? Because on my car the CV's break, not the actual axle itself.
 
Old Mar 12, 2007 | 03:28 PM
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Originally Posted by mclaren55
I wasn't talking about wheel hop, I was talking about delfection. However, if you have all solid mounts then I don't see deflection being a problem either. Is it the axle, or the CV's breaking? Because on my car the CV's break, not the actual axle itself.
Todd K inspected my mounts and we are good.
Both shafts at the inboard spline.
 
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Old Mar 12, 2007 | 03:54 PM
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Mark,

Nice progress since we talked! I have got to see this beast.

Congrats,
 
Old Mar 12, 2007 | 04:09 PM
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exactly my point to robmd99... a lot of those supras are registered and insured.. you making it down to houston for the meet?

Originally Posted by MARKSKI
There has been many arguments about what is a "street car"... my point is have it registered and insured... then I know ur a street car at least in the legal term. Just dont bring it on a trailer with full slicks to do a street race.
If u cant drive it then u cant race it... thats just my opinion.
markski
 
Old Mar 12, 2007 | 04:34 PM
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Just call me Rob :-) Are you going to the supra nationals??
Peace
Robert
 
Old Mar 12, 2007 | 04:35 PM
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does Justin Neni ring a bell?
 
Old Mar 12, 2007 | 05:13 PM
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yes i am.... pm me your info if you want to hang out.. i'm driving down on wednesday.. 23 hour drive

Originally Posted by robmd99
Just call me Rob :-) Are you going to the supra nationals??
Peace
Robert
 
Old Mar 12, 2007 | 05:22 PM
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Originally Posted by MARKSKI
We averaged 115 mph on all 4 runs we did @ the 1/8th mile. We also have a higher rev limiter so we are in 3rd doing so... then we switch gears at 128 mph into 4rth... that means we are at the beginning of 4th gear and thats where we loose to Todd Zs run... we only gain appx. 14mph in 4th gear. Todd Z is probably doing twice that. And thats his gain. I also think that he probably is running out of gear and has to shift into 5th just b4 the 1/4 and we obviously do not... thats his loss...
So trying to compare the 2 runs between Todd Z and I are somewhat skewed in my opinion especially when trying to understand the guts of the 1/4 run... our shift points are way different.
even though we did Ok I still do not think GT35rs are optimal for the track. As a matter of fact I know that Bobby ( who has run 9s in his 993TT) has extensive knowledge and according to him a gt30r with a 76 mm compressor would be the the way to go as far as 1/4 times...
mark
On the 140+ runs my car crosses the finish line at about 6800-6900rpm but at the time my limiter was set at 7200 instead of the 6900 that Todd Z car(his car has mostly stock internals except for rods) was set at so yes his car would be crossing pretty much on the limiter in fourth.The little higher shift point in the first three gears really helped my car get off the limiter and cross under power whereas when it was a 700 it would always hit the limiter at the first cone that records the average trap speed.

Jean hit it right on the head because the faster you travel at the 1/8mile you are entering the final 1/8 at a much higher speed and therefore don't have as much room for improvement because you are covering more ground faster without as much room for improvement if you entered the1/8 at 100mph.
 
Old Mar 12, 2007 | 05:26 PM
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yup.. he's only the best tuner in the game

Originally Posted by robmd99
does Justin Neni ring a bell?
 
Old Mar 12, 2007 | 06:07 PM
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Marski there are so many avenues for you to get more ET once you've nailed this setup. My thoughts follow (given your Evo I am sure you're on these already):

Your gearing is obviously all wrong for drag racing. You are in the bottom of 4th at the stripe when you want to be either at the top of 4th or top of 5th.

Your shifts are slow and the car is begging for a sequential tranny (ask Jean).

A puff of nitrous off the line will bring you into boost instantly and eliminate any lag.

Using a line locker on the line will allow you to stage with more confidence and bring the revs up into full stage. Not to mention make a decent burnout simple.

A two step will allow you to predetermine your launch RPMs and concentrate on nailing the light.

And finally the car is begging for slicks. Drag radials NO! Slicks YES!

I'd love to see you be the first 996TT in the world to run a 9 second pass!
 
Old Mar 12, 2007 | 06:08 PM
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Originally Posted by MARKSKI
Todd K inspected my mounts and we are good.
Both shafts at the inboard spline.
Are you telling me the CV cages held but the splines on the shaft didn't?
 
Old Mar 12, 2007 | 06:24 PM
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Originally Posted by MrBlonde
Your shifts are slow and the car is begging for a sequential tranny (ask Jean).
Sorry Kenny but you are dreaming .... The data Mark has sent me shows Bobby C shifting at .15 -.2 secs ....that isnt slow.Kevin
 

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