wyndzer

How can I slow my car down in the 1/4 and still be consistant? Pull timing? I need to drop a few tenths without letting off the accelerator.

I'm already at 15 degrees

SLPSS99

iTrader: (7)

Why? are you at the point you don't want a rollbar?

LC

maybe trying to qualify for a certain bracket class..

wyndzer

yes to both of you

kp

iTrader: (34)

Pulling timing and richening up the fuel, I made an adjustable throttle stop (I run all kinds of heads up index classes) but cant do that on a vette I dont know if there is a way to limit the ETC % or not in software, I assume you have a vette by yout avatar..

wyndzer

Yes, it's a vette. I'm thinking the best thing is to add some weight if I can, or put a deck of cards under the peddle.

kp

iTrader: (34)

Dont ever put something under the pedal, things like that have a strange way of making them stick at awkward moments..

Best thing to do is take power away on the launch, taking timing out up top wont do much. Drop it to 15 degrees down low and kill the 60 foot. You can also make some sort of air restrictor that blocks the inlet..

Adding weight isnt really the best way to do it unless you can do it safely..

brandonppr

iTrader: (9)

What about lowering shift points?

wyndzer

Exactly what I think I'll do.

1BADAIR

iTrader: (1)

yeah I was gonna say change shift points too

crazboy99

you can always add a taller gear....more top end...less acceleration

TXCAMSS

iTrader: (60)

I have found that lowering the shift points help me very little just as raising the shift points helps very little. My car has very good torque/HP down low though. I see as much as .04 difference by raising the shift points or lowering the shift points +/- 400 rpm so I leave them at 6450/6500 rpm.

Adding weight is effective, but too much weight strains the rest of the powertrain. Personally I do a little of each when i run in the 6.60 index classes. I add about 180#s, pull the timing down to 20* and add 2% fuel. I then add fuel (weight) and drop tire pressure in minute amounts to get it fine tuned.

The airbox restrictor plate is a great idea and possibly the most effective if you have a wideband to verify the AFR as I do. You don't want to go too rich and flush the rings.

I built a tune for the lower ET and I have a box that fits in the rear compartment that starps in and holds dumb bells weights so I can add or remove as needed to fine tune the ET.

This is a great thread. I wish there was an easy fix such as a throttle stop, but the LS1s are a little different animal and entering PE safely could be dangerous if you weren't monitoring the AFR/tune.

Ben R

Add weight.

GIZMO

iTrader: (8)

I would try not to do anything that changes the way that you launch the car, because you need good reaction times to win races. Weight, shift point, and tune are probably the best ways to kill ET. All can be changed to fix the car for DA. Lots of testing and log keeping will help you.

Good Luck,

Daren

gametech

iTrader: (1)

Try letting a wife or G/F ride with you yelling SLOW DOWN and gouging their nails in your side. I expect at least a .5sec reduction from this mod alone.

edit- I guess if she's fat it also counts as adding weight.

THE_SUPRA

bwahahahahaha!!!

Magnet

iTrader: (36)

just give me your extra speed.....

brandonppr

iTrader: (9)

how much do you need to slow it down?

TwoFast4Lv

iTrader: (8)

Adding weight and pull timing at the kaunch.

I tried (on accedent) lowering shift points. We are talking shifting into third gear by ten feet out and only slowing down three tenths. That is what happens when you leave the dyno tune forcing 3rd gear at 10mph in at the track!

Good luck. I just ordered the front half of the cage today so I can go nines

Ken95Z28

iTrader: (1)

Use the right foot and let off then back on.
I have won many 12.0 indexs. You don't want to screw up the launch at all like what was mentioned above by GIZMO. After the 1-2nd shift I let off count to a number then hit the gas again. This will get me in the ball park of where I need to run. I tried many things, lowering shift points, pull timing out all of that and nothing work as good as the right foot. Playing the stripe game is a rush for sure, sometimes you have to know when you are on brake out pass and let them get their first.