what rear on a turbo car
Thread Starter
Joined: Sep 2004
Posts: 717
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From: Fairview NC (near Charlotte)
what rear on a turbo car am I going to be better off with 3.70 or a 3.50 gear in turbo car with 6 speed tranny
my car is a 2002 Z-28 with a PTK air to air kit with a T67 turbo for now running 7 PSI but it will be more soon enough
my car is a 2002 Z-28 with a PTK air to air kit with a T67 turbo for now running 7 PSI but it will be more soon enough
Thread Starter
Joined: Sep 2004
Posts: 717
Likes: 0
From: Fairview NC (near Charlotte)
Originally Posted by BrandonDrecksage
what are you doing? street driving? drag racing? road racing, auto x?
most of the time street but it will be on the dragstrip some with slicks or mickey thompson DRs
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TECH Fanatic
Joined: Jul 2002
Posts: 1,218
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From: MI
I'd go for 3.50. I have stock 3.42's in mine and there's plenty of load. I like the long hard pulls too. When you're making that kinda power and torque, time spent in gear is much more beneficial then time spent out.
A Turbo system has a ton of midrange which is why you want a nice low gear to drive the torque. We are running 370's on the T88/408 combo from the old setup and might switch to a 3.40-3.50 gear.
I had 3.70's originally, and swapped to a 3.60. Both on a 28" 10.5W
I swapped more for extra MPH than load however
When I had the 6 speed, I tried various gears. 3.42, 3.55 and 3.73. 3.55 was the best match of RPM range, MPH, and ET.
I swapped more for extra MPH than load however
When I had the 6 speed, I tried various gears. 3.42, 3.55 and 3.73. 3.55 was the best match of RPM range, MPH, and ET.
I am also running 7psi in my stock-cube LS1 and a 6 speed, but running 4.10s, and I don't even get 7psi until the top of 3rd and into 4th, only 3-4 in 1st and 2nd, HUGE waste. I am also running a MP T70 T4 turbo rear-mount and 255/50/16 MT ET Street DR's. I wish I could go back to my 3.42's I originally had in the car! If I would've only known I was going to go FI I wouldnt've spent the $ getting the 4.10s! Just my .02, another vote for 3.50's on a 26" tire, or 3.70's on a 28".
i vote 3.50ish on either tire. I did a 3.73 to 3.23 swap in one weekend and compared times during that same weekend...results were 3.73=10.16............3.23=10.12........I stayed with the 3.23 cause i didnt have to wind the motor up so high at the end of the track
