lmt0705

iTrader: (7)

Race weight is 4150ish 4l80 with a 2.10 1st gear. 28.2 tall Mickey radials and 3.5 rear gear. My 60 is always between 1.34 and 1.39. I should be in mid/high 1.2s with the power I'm making I would think. I'm thinking the tall 1st gear is killing me

a05c

Have to kill the power. That heavy, and that agressive of a first gear, especially on a radial is hard to make work.

Either need to change the first gear in the trans to a lower ratio, or kill power and ramp it back in.

lmt0705

iTrader: (7)

Traction is not the issue, its a dog out of the hole right now

svslow

Is there something limiting you from adding more power on the hit?

93camaro_zzz

iTrader: (13)

^ This.

Cwarta

iTrader: (12)

Subbed, running 3.50 gears in a 3000# car. Interested to see what's suggested, for future reference

lmt0705

iTrader: (7)

I've tried up to 12psi doesent make much difference

lmt0705

iTrader: (7)

How do you determine proper starting line ratio for a car that weighs what mine does?

tblentrprz

whp, redline, and desire to optimize for 1/8 or 1/4?

tblentrprz

SLR https://www.bangshift.com/forum/foru...ne-ratio/page2

lmt0705

iTrader: (7)

12-1600 rwhp depending how much boost, I try to keep it at 7k. I run the 1/8.

tblentrprz

At 4150lbs and 1400whp, your looking at ~130mph 1/8 trap. At 7K trap (before converter slip) equates to 4.56 rear gear and 9.58 SLR (closer where you should be). At 6% TC slip, trap rpm will be 7450 or use 4.30 gear for max 7K incl slip. If you up the whp, you'll need to lower (numerically) gear ratio to maintain target rpm with increased trap mph.

93camaro_zzz

iTrader: (13)

Just wondering, what is keeping you from taking weight out of the car? And don't give me the "it's a street car" excuse. lol

Im just saying that it seems like this is the answer to all of your problems.

lmt0705

iTrader: (7)

Ummmm, it's a street car! Full interior, stereo system, sub box ect. Sees several car shows and cruise nights a week. That's why I kept the 4l80. I drive it everywhere

B18B1LS1

iTrader: (12)

If traction isn't a problem, and you haven't left at higher than 12 psi, then why not keep adding boost at launch?

Nitroused383

iTrader: (10)

How in the hell is your car so heavy that blows me away. Mine is full interior , cage, iron block, heavy 9" and a th400 it weighs 3400lbs. I don't see adding a sub box and 4l80 making my car weigh so much. Add boost and timing at the rpm you're leaving the line at.

Game ova

Not calling you a liar, but that makes no sense. If you have all that extra s$%@... seems it would be heavier. My car, which is the same as yours....but with me in it weighs 3750. And I have no cage or heavy 9". Maybe your scale is suspect.

lmt0705

iTrader: (7)

the car is 3860 without me in it, its been weighed twice, lsx block, cage, 2 big turbos, piping. its not light. id have to have my converter loosened up. dont think i can get it to stall anymore than 43-4400 and 12 psi. im still kind of wondering if its something with the converter

Game ova

I'm assuming that's on the transbrake?

Nitroused383

iTrader: (10)

My 6 speed turbo car weighs 3750 with me in it but it has stock kmember, stock 17 wheels, stock suspension except a fab 9". My auto car according to the scale at the dump is 3600 with me and 3400 w/out me. It has full light weight suspension, tubular kmember, light wheels, light carpet, no airbags, no heat or ac. Just the standard stuff I'd think a built car would have though?

LSX block is heavy so I can see that but damn she's a pig! If you want to gain more boost just pull timing at the 2 step rpm.