Corvette Z06 Forum banner
1 - 10 of 10 Posts

·
Registered
Joined
·
1,321 Posts
Discussion Starter · #1 ·
I went out to HRP Friday night and made 4 passes on the car. As per the advice of Ranger and some of the other folks I dropped the air pressure in the rears to 22.

My first pass was right off the street with no cooldown. 2.20 60' with a [email protected]

I used the heater to bring down the motor temp (it goes right down to 190).

Next pass I brought the revs up more, and worked on slipping the clutch a little more. 1.97 60' 12.41 @ 112

Next pass I cooled the car again to 190 went up to around 2800-3000 and bogged it slightly coming out off the hole ( still working on the release) the car went a 1.92 60' 12.35 @ 114

Last pass I blew the release and ended up with a 12.88 @ 111

I was impressed however that there is 3-4 mph on the big end depending on the launch. I am interested to see how a lower 60' time helps the cars mph.

Anyhow, thanks to Ranger and everyone else who is posting hints here. My quest is to get it into the 11s with no mods. I may try it first on some drag radials, just to see if it can be done, and then work on doing it on the stock radials.

Anyhow, take care.

Jarrod
 

·
Registered
Joined
·
1,265 Posts
Congrats on the times.... very good,, for stock... I have found when I put some good tires on the back, when the 60' came down, my MPH came down as well..

2.1 60's 114 to 115 1.8 60's mph 112 to 114

get a good set of tires and see the difference.....

Ernie
 

·
Registered
Joined
·
837 Posts
Nice runs, J-Rod. Like you said, the launch drives the ET. I've found that shifting, especially the one from 3d to 4th really drives the trap speed.

Looks like you're doing well on the launch. Anything better than low 1.9s on stock tires takes a sticky track and getting every thing right.

Ranger
 
G

·
Right On!

Looks like the GM stats are right on the money. They claim 12.40s @ 116 MPH for the 2002. Last year it was 12.60 @ 114.

20 Additional HP should net around .2 and 2 MPH on the Z06 power to weight ratio.

Our T-1 Intake looks like it lowers the e.t. by around .15 to .20 and 3 to 4 mph. The rest is the driver and the launch.

The track I was at on Saturday, was very slippery, making hard launches impossible, so the 1/8 mile suffered by around .25 to .30. The speed was pretty close to the guys running 11s with a 1/8 mile trap of 90.66 mph. The guys dropping into the elevens are all running over 119 MPH with one at 120.27. Both have headers in addtion to our T-1 or TRIC.

The heat of the engine makes a big difference. If you let the engine cool too much, the oil temp is not at rated viscosity. SAE oils are viscosity rated at 210-degrees F. The hotter the oil, the thinner it gets, and the less rolling resistance on your parts. The problem is the 2002 does not like heat. We see a loss of 14 to 16 RWHP when the water temps go beyond 212 degrees.

Many compromises.

Jim
 

·
Registered
Joined
·
142 Posts
Excellent Runs!!! Like Ranger mentioned Trap speeds are really governed by how well you hit all three shift points going down the track. Hitting the gears at the right RPM and shifting quick.

Good Job!!!
 

·
Registered
Joined
·
48 Posts
Wow

Those are very good times for a stock car. Is it a Z06? Your 60' times are very good also. My 02 Z06 ran 12.7 at 111 my first pass then got it down to a best of 12.41. Added the MTI ram air and got it to 12.367. My best 60' was like 1.875, haven't been able to get there again. I added a cam and long tubes and a new PCM and have gotten it to 12.145 at 117.5 with a very poor 1.98 60'. Looking for that magic 11.x. I was at HRP sunday night. It is easier to make runs on sunday. At least before 7:30. You can get four in by then and be home by 9.
Cheers
Rg
 
1 - 10 of 10 Posts
Top