Real world Vortec TPI performance
Joined: Sep 2004
Posts: 5,906
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From: Chicagoland Suburbs
Car: 1989 Trans Am GTA
Engine: LT1, AFR 195cc, 231/239 LE cam.
Transmission: M28 T56
Axle/Gears: 3.23 10bolt waiting to explode.
Re: Real world Vortec TPI performance
I need to follow this resurrected thread...I have a brand new S-D TPI Vortec manifold I bought 3 years ago, with the intent to drop L31 heads on my ‘88 L98...
Most information I found back in the day seemed to indicate HP at the crank in the 290-300 HP range, but the real improvement was supposedly torque, at around 400 foot-pounds, with a somewhat flatter torque curve, and roughly the same power falloff as the stock L98 above 5000 RPM.
I own a ‘93 LT1 Corvette, while Chevrolet rated it at 300 HP, I’ve always been disappointed at the 340 foot-pounds of torque they rated the ‘93 Corvette at, which IIRC, is within the range reported for stock L98 F-bodies back in the day.
From what I’m hearing here, the improvement with the S-D base and L31 heads may have been a bit...optimistic.
Most information I found back in the day seemed to indicate HP at the crank in the 290-300 HP range, but the real improvement was supposedly torque, at around 400 foot-pounds, with a somewhat flatter torque curve, and roughly the same power falloff as the stock L98 above 5000 RPM.
I own a ‘93 LT1 Corvette, while Chevrolet rated it at 300 HP, I’ve always been disappointed at the 340 foot-pounds of torque they rated the ‘93 Corvette at, which IIRC, is within the range reported for stock L98 F-bodies back in the day.
From what I’m hearing here, the improvement with the S-D base and L31 heads may have been a bit...optimistic.
just as the LS1 is a superior engine compared to the LT1.
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