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

Crunch time, need a suggestion

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Old Jul 30, 2006 | 04:27 PM
  #1  
Darkshot's Avatar
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From: Sacramento
Car: 91 RS
Engine: 350 TBI
Transmission: WC T5
Axle/Gears: 3.42 Posi
Crunch time, need a suggestion

Alright, heres the deal. I have a basically stock L05 with the top end of the TBI unit currently off. The FPR is adjustable, and I dont want to have to take it off again anytime soon. I have a pair of 90# injectors installed. I should note that I REALIZE I do not need these high flow injectors, but they are my only option. I have to run with them. I do NOT have a fuel pressure guage for TBI, but I need your BEST suggestion on how far in I should set the fuel pressure screw. Should the notch be half way? More towards the bottom? I will be starting EBL tuning when everything is put back together but I cant do that until I set the fuel pressure screw and put the TB back together.

I know its a shot in the dark, but give me your best guess. Where should I put the screw? Give your answer in percentage, 0% would be the notch all the way to the bottom, 100% would be the notch all the way to the top, 50% would put the notch in the middle, you get the idea.

Thanks!
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Old Jul 30, 2006 | 06:17 PM
  #2  
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From: Sacramento
Car: 91 RS
Engine: 350 TBI
Transmission: WC T5
Axle/Gears: 3.42 Posi


Sorry I know its only been 2 hours but the sun has started its descent and I need to get this back together
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Old Jul 30, 2006 | 06:48 PM
  #3  
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From: Maine
Car: 1988 Camaro
Engine: 1988 chevy pickup 350 TBI (rebuilt)
Transmission: 700r4- Bowtie overdrives
Axle/Gears: 2:73's
I set mine half way...
----------
Mine was near the bottom, but i moved it up... where was yours? to the top or bottom?

Last edited by 83Chevy_Camaro; Jul 30, 2006 at 06:49 PM. Reason: Automerged Doublepost
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Old Jul 30, 2006 | 07:08 PM
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From: Sacramento
Car: 91 RS
Engine: 350 TBI
Transmission: WC T5
Axle/Gears: 3.42 Posi
No idea, it was made adjustable long ago by a previous owner. I just took out the old injectors anyway, which were a much lower flow rate not to mention mismatched so I doubt the old setting would even be significant. I just need a ballpark guess so I can re-assemble and start tuning. I'm hoping to have this thing ready for bay area freeways by Tuesday.

Where can I get a TBI pressure guage to fine tune it? And if I do get a guage what should I set it at with a stock L05 and 90# injectors?
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