Maximum boost factory fuel system can support?

[mark_ckr]

Anyone have any idea how much turbo boost a factory EFI can support before you would reach a lean condition on pump gas? Considering of course that you have remaped so the factory fuel system in spraying at max.

Thanks.



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[MET]

Depends on how the system is set up. Most systems will support 6-8lbs. Then you will need bigger injectors. Closer to the 6lbs with stock Fuel pump.

 

[Doc_Busa]

Depends on how the system is set up.  Most systems will support 6-8lbs.  Then you will need bigger injectors.  Closer to the 6lbs with stock Fuel pump.

I am running 14 lbs on mine, but with turbo pistons and a spacer. However, my injectors are MAX'ed out at the top of the curve (in other words, working too hard). I am shopping around for new injectors now...

any suggestions?

 

[MET]

Which injectors are you running now stock. If so go up 2 sizes. If you already went up 1 size just go up one. I am running 14.5lbs and have went up one size. I think they are now Bosch 275cc. I have never approached going lean but they are all the way up there. Bosch 310cc would be the next best. Also depends on your fuel rail. 310's are a little bigger so watch that.

 

[RedBull]

Depends on how the system is set up .

Most systems will support 6 - 8 pounds .

Then you will need bigger injectors .

Closer to the 6 pounds with stock fuel pump .

 

[Boosted Cycle Perf]

By factory fuel system, do you mean stock pump, line, rail, and injectors? Or the typical turbo return style set up? What year bike?

I’ve had stock gen 2 injectors up to 340whp, but that was at 100% duty cycle right at 9800rpm. They do just fine at 320hp, and stay just under 90% duty.

In the next few weeks I’ll have my modified gen 2 injectors that give an extra 30% more fuel. Great for e85 guys, or someone who needs just a bit more fuel, but doesn’t want to break the bank with aftermarket injectors, and fuel rail upgrade.

 

[RedBull]

A) By factory fuel system,
do you mean stock pump,
line, rail, and injectors ?

B) Or the typical turbo
return style set up ?

C) What year bike ?

A) YES .

B) IF NEEDED .

C) 2002 under 240 ponies .

 

[Mr Brown]

You guys know this thread is 14 years old right? And the OP hasn't been on here in 10.....

 

[RedBull]

You guys know this thread
is 14 years old right ?

And the OP
has not been
on here in 10 . . .