Commerce Friday Night Drags: atlplayer, LSr-teg, any other NA cars

[Jenson]

Johnzm drove my car twice and hes a good driver.

My hatch went 13.98 @ 97mph, stock gsr swap, somewhere in the 23xxlb race weight, at commerce, on street tyres(stock CX 13's). And that was with 158 to the ground! I did have a "custom" ram air intake, maybe thats all you need.

I'd think your car should easily be in the mid to low 13's on slicks, at SDR, maybe even 12's. 15psi on the radials is way to much...try 5psi. After you do the burnout they will go up so on every pass you have to lower them again. I used to run my BFG's at 3-5psi, slicks too. I'd actually start at 1-2 psi for the first run and they'd be near 3-5 after the first run. Pump up the rear tyres to the max psi, helps anti squat and less rolling resistance.

Im kinda glad I didnt make it. Sounds like I would have had trouble getting 3rd to hook up I'll wait for the cold air just so I can go run a number again.

[chunky]

My hatch went 13.98 @ 97mph, stock gsr swap, somewhere in the 23xxlb race weight, at commerce, on street tyres(stock CX 13's). And that was with 158 to the ground! I did have a "custom" ram air intake, maybe thats all you need.

I'd think your car should easily be in the mid to low 13's on slicks, at SDR, maybe even 12's. 15psi on the radials is way to much...try 5psi. After you do the burnout they will go up so on every pass you have to lower them again. I used to run my BFG's at 3-5psi, slicks too. I'd actually start at 1-2 psi for the first run and they'd be near 3-5 after the first run. Pump up the rear tyres to the max psi, helps anti squat and less rolling resistance.

Im kinda glad I didnt make it. Sounds like I would have had trouble getting 3rd to hook up I'll wait for the cold air just so I can go run a number again.

It was a slow night, but I'm glad I went. I doubt anyone set any personal records last Friday. However, it was worth my 20 bucks b/c I got to pop off a few back to back runs to at least get some idea of how to get my car out of the hole consistently. I definitely need better rubber before I go again though.

[Catnip]

My hatch went 13.98 @ 97mph, stock gsr swap, somewhere in the 23xxlb race weight, at commerce, on street tyres(stock CX 13's). And that was with 158 to the ground! I did have a "custom" ram air intake, maybe thats all you need.

I'd think your car should easily be in the mid to low 13's on slicks, at SDR, maybe even 12's. 15psi on the radials is way to much...try 5psi. After you do the burnout they will go up so on every pass you have to lower them again. I used to run my BFG's at 3-5psi, slicks too. I'd actually start at 1-2 psi for the first run and they'd be near 3-5 after the first run. Pump up the rear tyres to the max psi, helps anti squat and less rolling resistance.

Im kinda glad I didnt make it. Sounds like I would have had trouble getting 3rd to hook up I'll wait for the cold air just so I can go run a number again.

I agree.
I've never used radials, you really run them that low? I ran regular street tires at around 10-11psi, they hooked decent, but nothing compared to slicks.

[Jenson]

I agree.
I've never used radials, you really run them that low? I ran regular street tires at around 10-11psi, they hooked decent, but nothing compared to slicks.

Of course, I drove around on the street with 15psi on radials, anything less was a bit dodgey in corners. If it looks like a flat tire before you hit the water box your doing it right Here's a great example:http://www.youtube.com/watch?v=C0-LK...eature=related

I know its not technically "right" but it always worked for me to run around 3-5 psi. More psi means the air is pushing on the sidewall trying to hold it up giving it less flexing/wrinkle capability and you are relying on the compound of the rubber alone. Running lower pressure means the sidewall kinda works like a wrinkle wall and offers the more contact patch. Thats my theory at least.


Mike, have you weighed the car? Maybe it has a large chunk of lead in the gas tank. What was your 60' time? Im guessing 2.4-2.5 range.

[Catnip]

Of course, I drove around on the street with 15psi on radials, anything less was a bit dodgey in corners. If it looks like a flat tire before you hit the water box your doing it right Here's a great example:http://www.youtube.com/watch?v=C0-LK...eature=related

I know its not technically "right" but it always worked for me to run around 3-5 psi. More psi means the air is pushing on the sidewall trying to hold it up giving it less flexing/wrinkle capability and you are relying on the compound of the rubber alone. Running lower pressure means the sidewall kinda works like a wrinkle wall and offers the more contact patch. Thats my theory at least.


Mike, have you weighed the car? Maybe it has a large chunk of lead in the gas tank. What was your 60' time? Im guessing 2.4-2.5 range.

Take the car and do a launch on some clean, light colored cement... it'll show which parts of the tire are making contact with the ground