GM Fuel Injection conversion - The 1947 - Present Chevrolet & GMC Truck Message Board Network

WB72 · 02-22-2011, 11:31 PM

Guys,

I have a 92 GM truck that I am planing on using fro parts. I am wanting to use the factory Throttle Body Injection, 700R4 and the brake booster and Master Cylinder.

About the Fuel Injection.....
I just had a 383 4bolt engine built with vortec heads and a new Edelbrock Carb (600CFM), it is dynoed at 400hp and 465ft/lbs.
-Will i see any performance increase if i went to the FI?
-Can the factory computer be used as a stand alone unit for this application?
-Is this swap worth the trouble?

Thank in advance for your wealth of knowledge.

W

D13 · 02-23-2011, 11:20 AM

92 is TBI.
You will see better starting and driveability with FI versus carb.
You will see less maximum performance (top end) with FI.
Dropping TBI on Vortec heads is not a direct bolt on. You can mate it to the carb intake with an adaptor but each adaptor degrades performance.
With what you have I'd leave it alone.

**Captainfab** · 02-24-2011, 12:58 AM

Setting up a TBI for a 383 will likely be fairly involved. I'm pretty sure you will need a throttle body from a 454. Plus you will need a custom chip burned for the computer. Depending on the cam that is in the 383, getting a chip that is going to be correct will likely require some data logging. The engine harness will need to be reworked for your application, or an aftermarket harness will be needed.

Unless you're up for the challenge and a learning curve, I would stick with the carb.

cableguy0 · 02-24-2011, 01:03 AM

Its an absolute waste of time and money to try and use tbi on a performance engine. They dont flow enough air or fuel. Its extremely expensive to make it work and you wont see any performance improvement

02-22-2011, 11:31 PM	#1
WB72 Before and After Join Date: Feb 2000 Location: Leduc, Alberta CANADA Posts: 632	GM Fuel Injection conversion Guys, I have a 92 GM truck that I am planing on using fro parts. I am wanting to use the factory Throttle Body Injection, 700R4 and the brake booster and Master Cylinder. About the Fuel Injection..... I just had a 383 4bolt engine built with vortec heads and a new Edelbrock Carb (600CFM), it is dynoed at 400hp and 465ft/lbs. -Will i see any performance increase if i went to the FI? -Can the factory computer be used as a stand alone unit for this application? -Is this swap worth the trouble? Thank in advance for your wealth of knowledge. W __________________ Not Grandpa's C-20 anymore... 383 Stroker 425HP, 485Ft/Lbs Lowered 3.5" Front / 5" Rear 66,000 miles. Alberta, CANADA

02-23-2011, 11:20 AM	#2
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,851	Re: GM Fuel Injection conversion 92 is TBI. You will see better starting and driveability with FI versus carb. You will see less maximum performance (top end) with FI. Dropping TBI on Vortec heads is not a direct bolt on. You can mate it to the carb intake with an adaptor but each adaptor degrades performance. With what you have I'd leave it alone. __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors

02-24-2011, 12:58 AM	#3
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,248	Re: GM Fuel Injection conversion Setting up a TBI for a 383 will likely be fairly involved. I'm pretty sure you will need a throttle body from a 454. Plus you will need a custom chip burned for the computer. Depending on the cam that is in the 383, getting a chip that is going to be correct will likely require some data logging. The engine harness will need to be reworked for your application, or an aftermarket harness will be needed. Unless you're up for the challenge and a learning curve, I would stick with the carb. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

02-24-2011, 01:03 AM	#4
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	Re: GM Fuel Injection conversion Its an absolute waste of time and money to try and use tbi on a performance engine. They dont flow enough air or fuel. Its extremely expensive to make it work and you wont see any performance improvement __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.



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