LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

fuel question

Old Aug 3, 2005 | 05:05 PM
  #1  
1crazylt1's Avatar
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fuel question

If u do a turbo setup and have fmu and fuel pump can u use the stock injectors?
Old Aug 4, 2005 | 10:10 AM
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Re: fuel question

Its not likely you would want to stick with the stock injectors. The FMU increases the fuel flow through the injectors by increasing the fuel pressure. The stock RP ball and seat injectors do not like to be operated at high pressure, and can lock up.

Just to give you an idea of what we are talking about here, your stock injectors are good for maybe 350HP. (yes, I know people have made 400rwHP with them, but they are over-worked when they do ). If you added a turbo that added 175HP (a 50% power increase), you would need to increase the fuel flow by more than 50% (a turbo needs a much richer A/F ratio than an NA engine). Lets figure you need to increase fuel flow by 65% (0.55#/HR/HP BSFC).

To get 65% extra flow out of stock 24's, you would need to increase the fuel pressure from 43.5psi to 120psi... and neither your pump or injectors will handle that. If you're going to go with a turbo setup, the last thing you want to do is get "cheap" with the fuel system.
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