Quote:
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Originally Posted by Batman
Quote:
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Originally Posted by Fasterthanyou
http://www.thirdgen.org/techbb2/showthread.php?s=&threadid=290728
12's with TBI and a "normal" carb engine  . Told you it wasn't the TBI nore air flow that was the problem... it's all about having only 2 injectors and fuel starvation. From just seeing these small GN motors idle at less than 1000rpm with 60lb injectors I've come to the conclusion that you should always overshoot on injector size! |
Still in the planning stage but I will probably go with 61# or maybe even 68# injectors and a higher pressure fuel pump with regulator setup. I agree, that will be the limitng factor, but I think it will still be doable. To hit 12's I am looking at about 320RWH, so I don't think it should be that bad. |
An easy way to look at TBI injector size is to do some simple math and use the port injection guy's flow rate calculators. Example; let's say you want 350fwhp, with port injection and 90% dc you'd want at least 22# if you've got good heads, 24# if you don't. So now multiply that by 8 injectors and you've got 192 now divide by 2 and you're left with 96# injectors needed with the TBI. Hence my reasoning for running 65# injectors rated at 12psi running at 28psi gives me 99# injector flow rates.
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, Jon
Owner of a Red Sled.
If it\'s EFI I can tune it. Specialize in 82-95 GM (yes Lt1\'s)
\"If you can leave black marks on a straight from the time you exit a corner till the time you brake for the next turn.......Then, you have enough horsepower\" - Mark Donohue
