I need some suggestions on how I can lower my 1/4 times at the track. I can work on the reaction times and slipping problems which comes with practice. My problem is that my top end is really good, but it takes too long to get up there. My trap speeds are typically 98-105mph, but the fastest ET I've ever had was 14.2. I am typically around 14.5-14.7 range. My car is SC'd by the way.

I see some cars (RX7 turbo for example) will only reach 87-90mph on their trap speed but I am chasing their tail lights at the end of the 1/4. My 60' times vary from 2.3-2.6 depending upon how badly I slip.

Also my car stalls slightly at times when I release the clutch. That's when I get 2.6 60' times. In any case, my trap will still be right around 100mph.

All the suggestions from the experts will be grately appreciated so that I can be instead of :browling:

 

i think you need to work on launching more than the mod to add low end.. for low end you can always do a custom CAI

but anyway.. try slipping the clutch at 3000 rpm.. once you get the hang of it you can let it out a little higher.. if you are still on stock clutch.. then an ACT clutch will help you with your launching better.. oh and time to get some Drag Radials too.. good luck

 

You might consider a new Cattman/Quaife Automatic Torque Biasing Differential to help you get power to the ground. An underdrive pulley & an aluminum flywheel will help your engine rev quicker. A heavy-duty clutch will help, as will BFG Drag Radials. A smaller pulley on the S/C will increase boost. Not to mention a shot of NOx w/ all the trimmings...

Are you confident in your launch technique? Talk to the other drivers to see how they handle things at your track. Do you lighten ship and let your engine cool down before you race? Have you ever put a couple zip-lock bags of ice on your intake manifold between runs? Do you steer clear of the water as you approach the start area? Do you redline each gear before you upshift? (If so, try shifting closer to 6,100 RPMs and see what happens.) Do you choose between shifting into 4th gear before the finish line or screaming across the finish line at redline in 3rd gear? If you are crossing the finish in an awkward RPM range, try putting smaller wheels on the front with low-profile tires. Do you lower pressure in your front tires to 24-psi? Do you raise the pressure in your rear tires to their max psi? Do you turn off all accessories before you run, like the vent fan, stereo, A/C, etc.? Have you ever *taped the seams* on your body panels to lower your car's coefficient of drag? ;-)

Whew! That's all I can think of... Good luck.

 

He can not run a UDP pulley on the car with a Supercharger. It takes away from boost being created.

 

Shifting to 4th gear is not an option for me but a necessity because of our wonderful rev limiter.

What does lowering the tire pressure do? I know I could probably do little better on my stock wheels, but I am not too lazy to change my tire just for couple of night per month. Maybe towards the end of the season when I am ready to put my winter tires on.

 

With your trap speeds, you should be anywhere from 14.1-13.7 based on your trap speed.

Do you launch the car? If not that is your problem. What are you 60ft times? Should be be 2.1-2.2.

Is your clutch ok? I remember when Cheston dragged it (@Maxus), he said the clutch was slipping. Between shifts, does it chirp, spin, anything. That can be another cause too.

Mods arent the prob, i think its the launch.

 

ya it's definetly the launch. i pulled 2.3's on my 60's in an auto before my udp. and the nos doesn't effect your 60's. you should be almost in the 2.0's for you 60's with a great launch and a s/c.