Horsepower difference?
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Horsepower difference?
In 1987 the GTA had 210 horsepower and 315 ft/lbs of torque
In 1988 the GTA had 225 horsepower and 330 ft/lbs of torque
What was the difference between these 2 years? I know the air intake was a little different, but is that the only thing for the increase? Is there something else?
Thanks
In 1988 the GTA had 225 horsepower and 330 ft/lbs of torque
What was the difference between these 2 years? I know the air intake was a little different, but is that the only thing for the increase? Is there something else?
Thanks
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iTrader: (1)
Joined: Feb 2000
Posts: 7,964
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From: Norfolk, VA. USA
Car: 86 Trans Am, 88 Formula
Engine: 95LT4, 305TPI
Transmission: T56, T5
Maybe one was a 305TPI T5 and the other a 350 Auto.
I know my friends 88 GTA 305TPI 5 speed was rated at 215hp while my 88 Formula 305TPI Auto was rated at 195hp.
I know my friends 88 GTA 305TPI 5 speed was rated at 215hp while my 88 Formula 305TPI Auto was rated at 195hp.
Supreme Member
Joined: Jan 2003
Posts: 1,931
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From: Ontario, Canada
Car: 1989 IROC-Z
Engine: 5.7L EFI LTR setup
Transmission: T-5 World Class
cam differances . They still had the same heads. Also the manual tranny got a diffeent cam then an auto setup . Are these both auto's ? check the specs page here and see the differances in the cams over them years.
Joined: Mar 2000
Posts: 43,187
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
GM Stock Cams
Model Number .05" Duration 1.5:1 Lift 1.6:1 Lift Lobe Sep. Notes
14093643 202/207 .404/.415 .431/.443 114.5 87 350,305man
10088155 179/194 .350/.384 .373/.410 109deg 87 305 auto
10066049 207/213 .415/.430 .443/.459 117deg 88-89 350,305
10111773 202/207 .413/.428 .441/.457 114.5 90-92 350,305
More duration/lift in '88.
'89-'92 had 240 horse with dual cats.
Model Number .05" Duration 1.5:1 Lift 1.6:1 Lift Lobe Sep. Notes
14093643 202/207 .404/.415 .431/.443 114.5 87 350,305man
10088155 179/194 .350/.384 .373/.410 109deg 87 305 auto
10066049 207/213 .415/.430 .443/.459 117deg 88-89 350,305
10111773 202/207 .413/.428 .441/.457 114.5 90-92 350,305
More duration/lift in '88.
'89-'92 had 240 horse with dual cats.
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