Kfxguy

iTrader: (1)

Fellow brochachos. I’d like some input from you guys. So yea, I have a heavy gto. I’m having a time getting it moving till it comes into boost. I had a 3600 stall and it would consistently pull a 1.7 60ft leaving in vacuum. I don’t have a launch control. Now I have a 3200 but I did go down on the cam. I was hoping the cam would counteract the smaller stall. Guess it didn’t. Best I could muster last night was a 1.86 foot braking to 2000. Then it would want to push or break the tires loose. Off the line there’s no traction issues at the moment. For those of you don’t know here’s the specifics
sbe 5.7
dorman ls2 intake
summit ghost cam
ss 3200 stall
billet 7875
2004 gto
3.46 gears


so should I change the stall? Or add a launch control? Do I run the risk of butting rings with a launch control?

dreadpirateroberts

iTrader: (1)

instead of foot braking, have you tried simply letting the stall flash?

Tim1137

What wheels/tires are you running? That is just as important. Maybe your problem is with that. Are you trying to cut a low 60 ft. time on an 18" drag radial? I know this seems like obvious stuff, but since you didn't mention, I asked.

Kfxguy

iTrader: (1)

I’ll try that next time. Thx. Forgot about that

Kfxguy

iTrader: (1)

275/40/17 nitto nt05r. Traction ain’t the problem yet. It’s leaving lazy because it’s not in boost. I’m sending the convertor off and have it readjusted. That should help.

ddnspider

iTrader: (26)

If you're launching in vacuum and trying any higher/harder the tires break loose then leaving in more boost doesn't solve anything. You need a better tire to start. Then get a 2 step on that thing or work on the tune some more. Should be able to build at least a couple PSI on launch.

Kfxguy

iTrader: (1)

I agree, but my stall would only footbrake 2000, its a little 3200. I dont start building boost till 2500 no matter what I do, so a better tire wont do much for me there. However, if i apply the emergency brake i can build boost, but I dont see any tire being able to hold like that. If I had stronger rear brakes, which ive considered. Gonna try the stall first. if I can leave on a couple psi, i'll be good.

ddnspider

iTrader: (26)

Do you have a log of your pass when youre stalling it up?

Kfxguy

iTrader: (1)

yes. Send me your email and I’ll get it to you

Kfxguy

iTrader: (1)

Hey guy....I'm back. Most of you know i hurt the motor. Just put a new one in (5.3) and had the stall adjusted from 3200 to 3600. Now instead of stalling to 2000 on the footbrake, it'll stall 3000 (odd?) on the footbrake. Still no boost on the foot brake. Can I retard timimg in that load area maybe, that way I can give it more throttle before it brakes the tires loose? think that will help?

ddnspider

iTrader: (26)

I've always read that you advance timing for an auto and retard it for a manual.

Kfxguy

iTrader: (1)

hmmm. Seems like with added timing vs retarded, it would make more power (to an extent) and push through the brakes even harder. I’m no pro or real experienced tuner, but taking timing away seemed to take power and response away.
I’ll try it tho.


meant to put that in this post earlier. Was in a hurry.

ddnspider

iTrader: (26)

Stick cars are retarded because there is no load in neutral. They rely on a misfire essentially to put unburn fuel into the exhaust to light the turbo. Auto's I believe they advanced to get EGT's going since you're under load.

Kfxguy

iTrader: (1)

aight. I’ll try it.

ddnspider

iTrader: (26)

https://ls1tech.com/forums/forced-in...pool-time.html

Kfxguy

iTrader: (1)

thanks...I have some things to try. Leaning out with more timing scares me tho.

ddnspider

iTrader: (26)

Haha but it's opposite, you have NO load and you're trying to make some. I wouldn't sit there forever but this should get you some boost if you do it right.

Kfxguy

iTrader: (1)

I'm just gonna go ahead and order a lingenfelter lnc-2000 today.

Buzzmanb12

iTrader: (11)

If you are foot braking to build boost, put it in neutral once you are staged and hold the brake really hard and rev it up to about 2k a few times and it will hold the brakes harder. You will actually feel the pedal drop slightly each time you rev it.

Kfxguy

iTrader: (1)

too late. Have an lnc2000 on the car now. I can build 3psi on regular tires, cold. So I should get 4-5 on drag radials, heated.