Taller tire, effective gear change ,opinions
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Joined: Sep 1999
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From: tulsa ,ok , usa
Taller tire, effective gear change ,opinions
Im currently running a ZZ4,TPI ,ported stock intake ,simese runners,auto with 3:73 and 2400 converter.With 26 in tall tires the car appeard to be over geared,was running out of engine before the traps.Best MPH in 3rd is 101.02 ,hitting 4th got a 102.7.,so that kinda proved my fears.Tires I had on it were
295/50/15, and I changes to 275/60/15 which are 2 in taller,and by the calc here ,gives me an effective ratio of about 3:50 rear.tires are about 1 in less in width.
Ive seen on here that most of the good running TPI cars are usually 3:42 rear,.so.......opinions, am I right in my theory that it should help the car are bunch,stay in power.torque band longer,not run out of engine ,etc
thanks
greg
295/50/15, and I changes to 275/60/15 which are 2 in taller,and by the calc here ,gives me an effective ratio of about 3:50 rear.tires are about 1 in less in width.
Ive seen on here that most of the good running TPI cars are usually 3:42 rear,.so.......opinions, am I right in my theory that it should help the car are bunch,stay in power.torque band longer,not run out of engine ,etc
thanks
greg
Supreme Member
Joined: Oct 2001
Posts: 1,392
Likes: 4
From: orlando, fl usa
Car: 1986 pontiac TA
Engine: 360 HSR
Transmission: 700r4 3300 yank converter
Axle/Gears: 3.27 9 bolt
when i went from 235/60-15 (26") to 275/60-15 (28") i picked up .24 in the 1/4 mile. this was with 3.42 gears. gear ratios are based on 27" tires.
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