?'s for you blown ls1 guys

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Jan 12, 2009 | 08:30 AM

RED94Z28

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From: Peoria Illinois

?'s for you blown ls1 guys

My buddy has a 1998 trans am with a vortech supercharger,intercooler longtubes,borla exhaust yank 3600 stall 373 gears. My question is when we went to the 8th mile this past summer all he could get out of it was an 8.56@84 mph.. With his mods he should be at least 420 rwhp i would think and he hooked up good at the strip so traction wasnt an issue. We were wondering what his estimated 8th mile times would be and if you think a bad tune could hurt him that bad

thanks Nick

Jan 12, 2009 | 08:40 AM

RsSean

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84 mph seems really low to me, is he running street tires or slicks? What gears in the rear? What where the 60 ft times

Jan 12, 2009 | 09:07 AM

RED94Z28

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Quote:

Originally Posted by RsSean

84 mph seems really low to me, is he running street tires or slicks? What gears in the rear? What where the 60 ft times

nitto dr's and his gears are 373 and his 60 ft averaged around 1.95

Jan 12, 2009 | 09:58 AM

RED94Z28

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From: Peoria Illinois

any other idea's

Jan 12, 2009 | 10:22 AM

Pro Stock John

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Quote:

Your ET computed from your vehicle ET of 8.56 seconds is 13.40 seconds in Quarter Mile.

Lame. A 98 TA, full weight, with that converter, full exhaust, tune, dr's and 3.73's should run mid 12's without the blower. Something is wrong.

I would check:
1) Belt slippage. Lots of slippage = no boost.
2) Shift points. Centrifrugal blowers like rpms. I'd verify shift points. If it was my car I'd be running at least LS6 springs, or better than that, so I could spin the car to 6500. With stock springs and a high mile car you might only be good to 6000 rpms at the most. Beefier springs are a no brainer.
3) Tune. Too fat?

He should be shooting for high 11's at stock weight and assuming 8 psi aftercooled.

Jan 12, 2009 | 10:26 AM

Urban Legend

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Might need the driver enhancement program.

Jan 12, 2009 | 10:59 AM

sevanseriesta

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Quote:

Originally Posted by urban legend

might need the driver enhancement program.

lmao...

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Jan 12, 2009 | 11:46 AM

slow67

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From: DFW

My cam only SS went 7.90s at 92 mph (1.92 60' trying to save the 10 bolt & 6spd)....Something is definitely wrong.

Jan 12, 2009 | 01:49 PM

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RED94Z28

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From: Peoria Illinois

Yea something is very wrong then. The car has 30000 miles so its not like its high mileage.. I think its in the tune but wow theres alot left in it when he first bought the car (he bought it with all the parts on it already except the convertor) i thought it would be a mid 11 second car and i still feel it should be..