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

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Old Nov 29, 2008 | 06:28 PM
  #1  
blkfirebird91's Avatar
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From: New Milford CT
Car: 1991 Trans Am
Engine: 305tbi to 350 carb'd
Transmission: 700r4
Axle/Gears: Stock
Question

I have a 91 firebird 305 tbi im getting a cam and intake put in do i need to upgrade my fuel pump thanks
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Old Nov 30, 2008 | 01:12 PM
  #2  
thomas1976's Avatar
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Joined: Jun 2006
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From: West-Central
Car: 91 Trans am
Engine: built 360 TBI
Transmission: built 700r4
Axle/Gears: 10bolt/3.23
Re: Question

Stock tbi fuel pump max is around 14psi, the stock injectors at 14psi should support 200hp.
You can also increase injector size, but will have better results by using the smaller injectors with higher fuel pressure.
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Old Dec 1, 2008 | 02:14 PM
  #3  
Ronny's Avatar
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From: wisconsin
Re: Question

I think the only way to know is to test the stock pump on a modded engine by monitoring the FP at WOT/heavy load. I have not done so but others have run a TEMPORARY line to a FP gauge and taped to windshield. Others have had a passanger hold gauge inside car. Not the safest way of monitoring however!
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Old Dec 1, 2008 | 09:37 PM
  #4  
blkfirebird91's Avatar
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Posts: 321
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From: New Milford CT
Car: 1991 Trans Am
Engine: 305tbi to 350 carb'd
Transmission: 700r4
Axle/Gears: Stock
Re: Question

yeah i have a fuel pressure gauge inside my car but not hooked up because of the unsafeness thats why im getting a bond on hood cowl to saw zaw a square sheet out of the stock hood so the engine gets air and to put the gauge there. thanks Ronny fo the update .
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