Realy cool but isnt there a chance of damaging the syncro rings in the box if trying to change too quick, this is why proper sequential boxes use dog engagment.

 

I think this shifter has been tested in race use, not to cause issues and John has a fully built tranny, just like his engine.

John, I just realized that you went to a GT900 level. So you started off at GT700, last year you were at GT800, right? So now you are at GT900? I don't think there is anything over 800 in the Denver area, so you may just be the top dog when it is all sorted out. Premature Congrats, by the way. It'll be fun to line up against you and see you walk away

 

Possibly but this is not a stock gear box.

 

Yes, they used what they learned while building Joe's car. Thanks Joe!

 

Joe, are you getting royalties?

 

We're running at the track tomorrow. The car is tuned and dialed in for altitude. It made 840 whp and 775 ft/lbs of torque on the dyno today.

 

yowza!!! can't wait to see it go....John, good to see your project finished hopefully by tomorrow.

 

That's good news and happy for you.I'll be rooting for ya tomorrow!

 

Getting royalties? Please.... Joe IS royalty

 

Congrats John, wish you the best at Bandimere tomorrow. I am sure the car will be everything you hoped it would be...Good Luck!

 

i hope your bringing a video camera to the track tomorrow!!

 

I can't wait to see the numbers. Unfortunately you're going to be fighting the power robbing altitude, so the numbers as awesome as they may be, would probably be quite a bit better in lower elevation. Congrats and good luck tomorrow!

 

As for power robbing altitude, I have dome some studying on this subject, being fairly new to this area. Here is what I have found:

-Dynos factor 25-32% loss for NA cars and 15% loss for Turbo cars.
-A stock 996 Turbo ran a 107 mph up here.
-People at the track tell me that Turbo cars generally loose about .5 to .7 seconds, NA cars loose close to a second

I actually calculated what the exact loss is supposed to be for a car running say 1.5 bar at 6000 ft. and it is 8% approx.

The tighter, high compression NA motors loose less than non-performance motors, etc. Intake/exhaust mods go a long way to offset power loss in NA cars.

Whatever numbers John gets, will be about 5-6 mph less than at sea level. His time will be about .5-.6 seconds lower.

Really best way yo know for sure is to run car up here and then run it at sea level under similar atmospheric conditions, which is nearly impossible.

 

Wed
Jun 24 80% humidity today, believe it or not.


6 am

56° F


7 am


58° F





8 am

63° F



9 am

69° F



10 am

73° F





11 am

77° F





12 pm

79° F





1 pm

81° F

3 pm

82° F





:

 

Brutal day in Denver. Bandimere is 5800' absl. With all factors the correction was just under 8,500' absl! We might as well have been drag racing on Vail pass.

The turbos are too small for this altitude. They made 25 psi in AZ and maxed out at 20/21 psi today. This was as high as they'd go no matter what we tried. We're going to change from 3071's to 3076's. This fall we're going to go to GT35's.

Times were very consistent:

60' 1.698
330 4.665
1/8 7.04
MPH 106.55
1000 9.010
E.T. 10.666
MPH 137.04

We ran the GT700 Cayenne a few times and trapped at 107. That's cooking up here. Stock vets rarely break 100 MPH to put it in perspective.

I have a Heffner N/A Viper. It's 700 HP. Best trap speed was 111 MPH.

Racing up here is a whole different ball game but still tons of fun.