TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

89 Tbi

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Old Jan 23, 2003 | 07:55 PM
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Acidtalons's Avatar
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89 Tbi

How much horsepower will the stock TBI unit from a 89 305 Trans Am support?
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Old Jan 23, 2003 | 08:48 PM
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Beast5spdGTA's Avatar
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From: Palm Bay, FL
Car: 2007 Corvette Z06
Engine: LS7
Transmission: 6 speed
I don't have any hard results but, using rwhp vs wieght vs 1/4 mph I've gotten ~220+ rwhp in a 305 or about 240hp with a stock TBI T/B. This is in a stock 91 TBI with stock inj.

Edit: My guess is ~275-300 flywheel hp.

Last edited by Beast5spdGTA; Jan 23, 2003 at 08:51 PM.
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