How to improve 1/8 mile times?

[03shadowgreygt]

I have a 98 cobra that I had an s trim and a stock motor with 4.56 gears 5 speed 389 hp and rev limiter set at 6k with 26" et drags I ran a 7.87 at 91 in the 8th. Now it's a built motor with 550 rwhp and 3.73 gears same slicks and 5 spd. My best time is 7.45 at 96-97 in the 8th. Car has 90/10 up front with ford b springs tubular k member 03 cobra front control arms with mega bite jr lower rear arms. Supercharger is now a t trim at 15 lb boost. What is the best way to get lower 7s to high 6's in the 8th? Do I need to go back to 4.10-4.30 gears to get there? I cross the lines at the top of 3rd gear now which I thought should put me the top of 4th in the 1/4? I'm not too worried about 1/4 mile though. The car I need to beat wont run me in the 1/4. Thanks for any suggestions

[Sleeper]

28 inch tire would help get the 60 down with your power level imho.

You should be in the 1.5s to 1.6s atleast.

[03shadowgreygt]

If I remember right I am high 1.6's think I got 1.59 with the 4.56's

[2165 Turbo Rail]

Ls swap

[musclestang89]

3.73 and automatic.

[03shadowgreygt]

I wish I would have gone auto instead of upgrading my t45 but I didn't want that at the time and don't want to spend that kind of money at this time. I know with some small changes in my set up I should be able to get 6's. just trying to figure cheapest easiest way to it. Thanks for the ls swap comments lol

[whitetrash]

what tire pressure in the slicks? whats your launch rpm?

[OrangeChevyII]

Ls3 FTW

[Super Coupe]

The best way it to start doing weight reduction.

[speederdude]

pole smokers and there ls3's.

[03shadowgreygt]

12 psi air pressure launching at about 4k, maby slightly more. have launched at 6 when it didn't have supercharger

[Sean88gt]

Why would you rev limit a 4v to 6k?

[VaderTT]

Be less gay, that'll work.

[03shadowgreygt]

Why would you rev limit a 4v to 6k?

When the motor was stock 120k miles. Was at 8 psi boost at 6k. I can rev it to 7k now

[twisted93coupe]

You can pick up a tenth on every 100 pounds you loose.