I just got my 4.10's installed last week and am racing this week and i was wondering what to launch my car at? I was launching at 2100rpms with my stock gears, but as you know, the 4.10's are hard to grab traction. And don't forget that traction control wasn't an option till 2001, so i don't have a locker or any reputable t-lock, just the p.o.s posi traction that come stock with the car. Here's my list of mods and see what you think i should launch at based on the mods. Just a guess, but i say about 260rwhp. The one thing that worries me is the 18" rims. Since i put them on, i noticed a slower time at the track, but they look a lot better than 16's.

K&N FIPK
BBK 75MM THROTTLE BODY
BBK 75MM PLENUM
PRO 5.0 SHORT SHIFTER
DIABLOSPORT PREDATOR TUNER
SPEC STAGE 2 RACING CLUTCH
SPEC ALUMINUM FLYWHEEL
FLOWMASTER SUPER 40 SERIES CATBACK
BBK OFF ROAD X PIPE
MOTIVE 4.10 GEARS

MACH 1 GRILLE DELETE
MACH 1 CHIN SPOILER
03 COBRA REAR BRAKE SYSTEM
POWERSLOT SLOTTED FRONT ROTORS
CARBON METALLIC BRAKE PADS
03 COBRA RIMS
-FRONT: 18" X 9" WITH 265/35/18 NEXEN N3000 TIRES
-REAR: 18" X 10.5" WITH 295/35/18 FIRESTONE FIREHAWK WIDE OVALS
AUDIO SYSTEM: ALL PIONEER PREMIER WITH 2 12" SUBS

 

launch from idle and slowly bring it up untill its spinning. i set my rpms at about 1200 so i dont have to fiddle with the gas at the track.

 

just launch like normal, but you let your foot up slower as it grabs traction.

 

the same differential is in every gt from 99-06. Bloody Ford 8.8 Trak-Loc. Traction control has nothing to do with the differential in our cars. The difference is electronics. Positraction is GM, Trak-Loc is Ford.

 

thanks alot. i will move the idle rpm's up with the predator tuner and see how it goes.