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fuel psi

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Old Jan 25, 2004 | 02:13 PM
  #1  
luke4907's Avatar
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From: WPB, FL
Car: '89 Trans Am GTA
Engine: TPI350
Transmission: 700r4
Axle/Gears: BW 3.27s
fuel psi

I'm just wondering what you guys are running out there. I know 3rdgen states somethin like 58ft/lbs max gain by changing from 42 to 50psi, that sounds like a bit of a stretch to me though.. I'm running a stock 89 tpi350. Any opinions/suggestions would be appreciated.
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Old Jan 25, 2004 | 03:47 PM
  #2  
hydric's Avatar
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Joined: Oct 2002
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From: Ohio
Car: 1985 Iroc-z
Engine: 355 sbc
Transmission: 700r4
i belive the range should be between 45psi-50psi..

5-10psi for a carb depending on mods/set-up
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Old Jan 25, 2004 | 10:29 PM
  #3  
luke4907's Avatar
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From: WPB, FL
Car: '89 Trans Am GTA
Engine: TPI350
Transmission: 700r4
Axle/Gears: BW 3.27s
that's what i've heard... bout 46psi or so is pretty streetable.. of course I'll have to just suck it up and do some testing and tuning of my own... thanks
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Old Jan 26, 2004 | 11:23 AM
  #4  
dankhound's Avatar
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Joined: Jan 2002
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From: Bloomingdale,IL
Car: 91 RS
Engine: 305 Tbi (L03)
Transmission: 700r4
Max pis for carb is 8 or the float pintle wont close. On injectors max psi is 75 or injector wont close. For a stock motor use 40 to 45 or your just gonna kill fuel milage.
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Old Jan 28, 2004 | 01:34 AM
  #5  
dj haf's Avatar
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Joined: Aug 2003
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From: Miami, Florida
Car: 1990 IROC-Z
Engine: 350 L98
Transmission: 700R4
would too much fp cause me any damage to my engine? and what psi is too much?
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Old Jan 28, 2004 | 07:39 PM
  #6  
88 350 tpi formula's Avatar
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From: WI,USA
Car: 89 FORMULA 350, 91 Z28 Convertible
Engine: ls1, LB9
Transmission: t56, Auto
Axle/Gears: S60/ 3.73
too high of fuel psi does shorten fuel pump life. if you raise the fuel psi you milage will go down depending how long you run in open loop. once it goes to closed the ecm will see it is rich and will take away fuel. (see you block learn and fuel intergrater) the power increase is from the fuel being atomised better more like when you take a spray bottle and squeeze the trigger real slow and the squeeze real fast same Idea. the injector does the same thing. the ecm just cuts down on the pulses when it see how rich it is running.
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