n/t 47 psi fpr and 150 lph fuel pump. is it too much fuel?

[ilco187]

So basically i am trying to figure out the percentage of how much more fuel a 150 lph fp and n/t 47 psi fpr inject over the stock 102 lph fp and stock 36 psi fpr.

I have 2g maf and 550cc injectors.

 

[knochgoon24]

The 550cc injectors are 550cc/min at 43.5psi.
They'll flow 455cc/min at 36psi and 594cc/min at 47psi.

The fuel pump has no effect as long as it provides enough flow for the injectors (it will) and as long as the fpr doesn't get overrun (it won't).

 

[ilco187]

thank you, so should i switch back to the turbo 36 psi fpr.

cause i have the screw on the 2g maf backed out flush and all combs in, so with that 31% should i take that out with the afc i think i would run way lean at that would it.

sorry if these are noob questions.

 

[knochgoon24]

Sorry. I thought you were talking about an n/t car. I didn't read your post carefully enough before I posted the first time. Reread the edit.


Also, you'll be better off running the the stock fpr. The 2g MAS and 550cc injectors will almost cancel each other out when you run the stock fpr. I hope you have a wideband. The AFC will help fine tune it.

 

[ilco187]

also from what i read on most threads about afpr's they say to set them at 43 psi, so if i was to get the turbo auto fpr its rated 42.7 psi so would that be a better fpr than the 36 psi turbo fpr, i think the 47 psi fpr is too much.

 

[TenSecondSTi]

also from what i read on most threads about afpr's they say to set them at 43 psi, so if i was to get the turbo auto fpr its rated 42.7 psi so would that be a better fpr than the 36 psi turbo fpr, i think the 47 psi fpr is too much.

Don't forget the fuel pressure will rise under boost 1:1 so with 43psi base and 25psi that's 68 psi the more fuel pressure will also cause the fuel pump to drop as pressure rises a walbro 255 or any pump will flow less lph

 

[donniekak]

also from what i read on most threads about afpr's they say to set them at 43 psi, so if i was to get the turbo auto fpr its rated 42.7 psi so would that be a better fpr than the 36 psi turbo fpr, i think the 47 psi fpr is too much.

It's not to much if you pull fuel out with an afc. Do you have a wideband, or at least a logger?

 

[TenSecondSTi]

It's not to much if you pull fuel out with an afc. Do you have a wideband, or at least a logger?

Won't work I tried it with a 2g FPR no matter what i did at idle low fuel trim would peg rich and when driving the low trim would go back to normal. If I sat in the car and help it at 1k rpm's the fuel trim would go to normal. When this happens your mid and high fuel trims will not move since the Low trim can't settle down.

It's just going to add to much fuel at idle and give you a crap idle. Keep the stock FPR in the car. 36psi is fine