Launch question

Don W.

Don W.

Stab it and steer it
Maybe this is not new to anyone but me but I have discovered this year that if I launch "soft", that is, say, 1500 RPM, little boost, that I get BETTER times. If I launch harder it seems to result in nothing more than rear wheel spin and slower times. For example, last night, soft launch: 60' 1.774, 1000' 11.02, 1/4 13.335 @ 98

This seemed to happen with all the work I've been doing to pass smog. (Different thread.)

So until I get my Battle Bars and maybe some street slicks I'm going with soft launches.
icon_rolleyes.gif
 
JKsSyclone

JKsSyclone

Active member
Re: Launch question

It also depends on how modded it is. I dont think the same rule will apply to a stocker.
 
Don W.

Don W.

Stab it and steer it
Re: Launch question

OK, 1500 +/- a bit RPM, boost @"0" on the gauge. Meaning no boost no vacuum. Once I start building measurable boost it goes to tire spin. The more I boost the more I spin, enough to go sideways at, say, 5# and beyond. It may be my tires. Michelin Pilot XGT V4 P245/50 R16 Gorgeous tire but maybe not for the drags. But it's what the truck came with.

Like I said Battle Bars and street slicks.
 
bezerk

bezerk

New member
Re: Launch question

if i lauch my truck at 5PSI it spins all 4 tires

are those michelins pilot exaltos? i had them on my daily driver, and they were verry sticky..
 
dgoodhue

dgoodhue

BuSTeD 4.3
Re: Launch question

Don W. said:
OK, 1500 +/- a bit RPM, boost @"0" on the gauge. Meaning no boost no vacuum. Once I start building measurable boost it goes to tire spin. The more I boost the more I spin, enough to go sideways at, say, 5# and beyond. It may be my tires. Michelin Pilot XGT V4 P245/50 R16 Gorgeous tire but maybe not for the drags. But it's what the truck came with.
Click to expand...

The rear tire spins while building boost at the line or it spin when you launch it? I had those same Michelin Pilot on my Sy. They weren't the greatest DR tire. The best I ever got was 1.77 or 1.78 with many 1.80's...
 
WannabaTY

WannabaTY

New member
Re: Launch question

I launched mine at @10-12 psi at the track and got a 1.83 60ft time. Then a left at lower boost and got a 1.9 60ft. No wheel spin at the track. Every now and then it will break them loose on the street. But IMO I would rather leave the line in boost, then lag it off the line and have to play catch up.
Don
 
TYTILIDIE

TYTILIDIE

METH HEAD
Re: Launch question

Sounds liek your AWD isnt working. I launch at 17psi easily with 0-very little wheel spin. Even when you hear them chirping or spinning Im still launching hard. IMO, you shouldnt be able to spin sideways with a working AWD ON A TRUCK LIKE YOURS.
 
AUSyTyIN

AUSyTyIN

Unbusted $#it box
Re: Launch question

TYTILIDIE said:
Sounds liek your AWD isnt working. I launch at 17psi easily with 0-very little wheel spin. Even when you hear them chirping or spinning Im still launching hard. IMO, you shouldnt be able to spin sideways with a working AWD ON A TRUCK LIKE YOURS.
Click to expand...


Correct. He is at lower altitude ( = more power), but he shouldn't be spinning that much.
 
Don W.

Don W.

Stab it and steer it
Re: Launch question

I was wondering the same thing. How does one actually check AWD function. I can jack all 4 and watch them turn but is the front really getting a torque? I could always jack just the rear and see if it will drive off the jack.:rotf:
 
WannabaTY

WannabaTY

New member
Re: Launch question

I dont spin them hard at all. I haze them for about 5 feet at the most. Even on a full boost launch. But at the track I cant even break them loose on a full boost.
 
AUSyTyIN

AUSyTyIN

Unbusted $#it box
Re: Launch question

Don W. said:
I was wondering the same thing. How does one actually check AWD function. I can jack all 4 and watch them turn but is the front really getting a torque? I could always jack just the rear and see if it will drive off the jack.:rotf:
Click to expand...

You are testing it when you are at the track. It failed. :lol:
 
blk00z28

blk00z28

Forced to by choice
Re: Launch question

WannabaTY said:
I dont spin them hard at all. I haze them for about 5 feet at the most. Even on a full boost launch. But at the track I cant even break them loose on a full boost.
Click to expand...

Ditto, in a way. On the street anything over 6lbs I would spin for a few feet. At the track, 15lb launch's it wouldnt spin at all, but if I went over that it would spin some.
 
TYTILIDIE

TYTILIDIE

METH HEAD
Re: Launch question

Hmm, maybe its a SY thing. Even when I cut a 1.7 60' I dont get that. Maybe I will though someday. My friends TY breaks loose super bad and goes all over the place but the funny thing is that his truck is much slwoer than mine. I used to use the Mirada something or other tires 255/50/16 on my stock wheels and now I use Sumitomo 285/35/18 rear and 275/45/17 front on my Z06 wheels. Both have as god of traction as the other.
 
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