97 UK car currently with 240bhp on exhaust and Walboro fuel pump.

I am changing the turbo and getting an Apexi PFC so I am expecting between 300 and 330bhp.

I understand my standard injectors will be running out of grunt at about 300bhp, so can I get away with a fuel pressure regulator and run at slightly higher pressure or do I need to get some 440 injectors ?

Would appreciate some guidence on the injectors as well. Do I have Phase 1, 1.5 or 2 ? And where can I get some from.

eBay currently has some standard 1995 RA injectors, but they are Grey so i think they are the same as mine anyway.

Thanks in advance.

 

I've been told that the standard FPR can misbehave when you get over 300bhp, not sure what the current thinking is on that though. The preferred solution seems to be bigger injectors.

 

Buy an SX FPR from me and you will be sorted! (look in the for sale section)

 

So I'd need bigger injectors and better FPR, or just run the SX at 3.5 bar ?

 

Best advice is to contact the mapper you plan to use for his recommendation. He may even be able to fit it for you if necessary.

 

You need bigger injectors for circa 330bhp, just raising the fuel pressure on 380's won't be enough.

440's may still need raised fuel pressure, depending on how rich/lean it's mapped, and on what rolling road you want to get your 330bhp !

550's is probably the better option, and will allow some flexibility for later, especially if you then fit an adjustable reg too.


Mark.

 

As Mark says.
Here's a pic showing approximate bhp levels you *could* get with alternative injectors and fuel pressure.