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Gear for turbo car

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Old 05-04-2010, 12:46 PM
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Default Gear for turbo car
Im trying to figure out what gear to put in my rear end. Im posting here due to it being a turbo car. so this is what i have. 96 firebird, between 3600-3400lbs. mabe lower hopefully. 370ci engine, pt91.5 turbo, powerglide trans Im gonna rund like a 325 drag radial and the rear end is a for 8.8. Im thinking of a 355 gear but i wanted to see what you guys think. If any more information like cam and heads are needed let me know so i can post it. thanks guys. Oh the times i trying to shoot for is mid 8's at least
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Old 05-04-2010, 01:05 PM
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that should work well...I ran a 3.70 with my 366/98mm combo
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Old 05-04-2010, 01:14 PM
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Originally Posted by Fireball
that should work well...I ran a 3.70 with my 366/98mm combo
How tall was your tire?
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Old 05-04-2010, 01:23 PM
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Originally Posted by ls2formula
How tall was your tire?
30"...thats why I went 3.70...changing to a 3.40 gearset on the new build
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Old 05-04-2010, 03:45 PM
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what would you guys do with a 28" tire in a 3000lb car? 5.3 tc76
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Old 05-04-2010, 04:15 PM
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Originally Posted by cjmatt
what would you guys do with a 28" tire in a 3000lb car? 5.3 tc76
do you have a fbody and if so how did you get you car down to 3000?
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Old 05-04-2010, 04:23 PM
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Originally Posted by Fireball
that should work well...I ran a 3.70 with my 366/98mm combo
with your 366/98 combo what did you run? and what was your mph and what did you shift at and spin your motor to.
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Old 05-04-2010, 04:25 PM
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Originally Posted by bumpin_records
with your 366/98 combo what did you run? and what was your mph and what did you shift at and spin your motor to.
mostly 1/8 mile stuff...but ran out the back door to 7.99 @ 177. Best mph 181. shifted at ~8K
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Old 05-04-2010, 04:54 PM
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Originally Posted by Fireball
mostly 1/8 mile stuff...but ran out the back door to 7.99 @ 177. Best mph 181. shifted at ~8K
That's the opposite of slow.
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Old 05-04-2010, 05:12 PM
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Originally Posted by Fireball
mostly 1/8 mile stuff...but ran out the back door to 7.99 @ 177. Best mph 181. shifted at ~8K
wow, what was your internals like?
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Old 05-04-2010, 06:36 PM
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I'm running a 3.55 gear and wish I could go to a 3.25. 8.98 @ 153 on 28" tire (325/50/15) and going thru at 7400 RPM.
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Old 05-04-2010, 07:16 PM
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Originally Posted by 98Z28CobraKiller
I'm running a 3.55 gear and wish I could go to a 3.25. 8.98 @ 153 on 28" tire (325/50/15) and going thru at 7400 RPM.
sound like you have the closest combo to what i got. what trans are you running?
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Old 05-04-2010, 07:29 PM
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Originally Posted by bumpin_records
sound like you have the closest combo to what i got. what trans are you running?
TH350 with a lazy tbrake
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Old 05-04-2010, 08:02 PM
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30" tire, 3.7 gear, 155 mph, 7000 rpm, 8% converter slip
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Old 05-04-2010, 09:12 PM
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I'm very happy with my 3.00's
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Old 05-05-2010, 05:54 AM
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Originally Posted by Zombie
That's the opposite of slow.

it was very slow for the power level...car ran mid 140s in the 1/8 pretty consistantly. it just wouldn't get up to good boost for 2 seconds of the run so it always left like a turd...I was owned by the low compression
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Old 05-05-2010, 05:55 AM
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Originally Posted by bumpin_records
wow, what was your internals like?
callies magnum XL crank (3.622 stroke), JE pistons, GRP aluminum rods
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Old 05-05-2010, 10:47 AM
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Originally Posted by Fireball
callies magnum XL crank (3.622 stroke), JE pistons, GRP aluminum rods
oh aluminum rods. I see. nice
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Old 05-06-2010, 01:43 PM
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Originally Posted by bumpin_records
do you have a fbody and if so how did you get you car down to 3000?
Easy, I swapped everything out of my F-Body into an 89 Mustang LOL
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Old 05-06-2010, 10:00 PM
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Originally Posted by koolrayz
30" tire, 3.7 gear, 155 mph, 7000 rpm, 8% converter slip
29.5 141mph 6% slip but i only cross the traps at 6300.... More Gear or Losen the converter?
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