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Old 03-15-2011, 06:18 PM
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1993 chevy 350 4 bbl tbi

I need some major help here!!!! i want to put a different intake on my stock 1993 Chevy truck with a 350 engine. i bought a Holley 4 bbl tbi that's new old it's about 7 years old. will my computer work with this tbi...Holley told me it would fry my computer if i hook it up,does anybody have any ideas????

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Old 03-15-2011, 06:54 PM
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Quote:
Originally Posted by app68
I need some major help here!!!! i want to put a different intake on my stock 1993 Chevy truck with a 350 engine. i bought a Holley 4 bbl tbi that's new old it's about 7 years old. will my computer work with this tbi...Holley told me it would fry my computer if i hook it up,does anybody have any ideas????
First, you'd have to buy a 4 barrel intake that will fit the center bolt angle of these heads to fit the Holley.

Second, the GM computer's output impedance is to drive 2 to of those big injectors not 4, it would not be long before the GM computer went up in smoke.

Third, with swirl port heads you're never going to flow enough air to use the Holley 4 barrel TBI's capability. See my last comments in this post; http://www.hotrodders.com/forum/newr...eply&p=1392114

Fourth, the cam is mild and the stock computer shuts off the fuel at 99 mph so nothing amazing is going to happen with the Holley 4 barrel TBI, this is working the wrong end of the problem first. for a cam about as wild as you can go is this http://www.edelbrock.com/automotive_...chevy_sb.shtml the 3702 cam or someone else's equivalent. TBI will require a chip, the cam cannot get so aggressive the idle vacuum gets much under 15 inches and needs to be better than 10 inches or all discrimination by the sensors is lost as to the computer being able to calculate air flow, thus fuel, through the engine.

Fifth, the problem with the 2 bbl TBI is not air flow, it's getting enough fuel into the engine from those injectors, the 4 barrel can do that but it takes the Holley computer because of the driver to injector impedance issue. Folks used to modify the GM computer to do this but I think everyone in the business has given up on that because of the failure rates. Try these people http://www.tbichips.com/ .

Bogie
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Old 03-15-2011, 07:00 PM
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The holley replacement TBI is rated at 675 CFM, Good for up to about 275HP.
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Old 03-15-2011, 10:42 PM
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Quote:
Originally Posted by app68
I need some major help here!!!! i want to put a different intake on my stock 1993 Chevy truck with a 350 engine. i bought a Holley 4 bbl tbi that's new old it's about 7 years old. will my computer work with this tbi...Holley told me it would fry my computer if i hook it up,does anybody have any ideas????
No its not designed for 4 injector. You need to replace the computer with a upgraded one.

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