Looking to upgrade for safty margin

Upgrades MAF & Testpipe catback, Plan to upgrade to low rpm spooling turbo and run approx 16lbs boost.

Would Seimens or Delphi be prefferable and 48 or 55lb.

Thanks
Steve

 

55lb, both flow fuel but you need some tuning capability. Stock injectors with proper fuel pressure is all you really need up to about 300whp. There are plenty of 951's running close to 400whp with stock injectors. Not for me, but it's been done.

 

short answer: I have Siemens high impedence and they work great! Also, I have heard some bad opinions about delphi injectors, although I have no personal experience with them.

A 3 bar FPR will probably do the trick unless you are planning to pick up some serious power. On the other hand, here is a datalog where I saw duty cycle spike as high as 98% on the stock injectors with a stock exhaust and a k-26. I was running a 3 bar FPR and the AFR was between 11.2 and 11.8 for most of the run. The car trapped just under 97mph on this run compared to 93 stock for reference. Boost was just under 11psi because I was still working on my ignition table. Maybe I need to check my fuel filter...



I have my doubts about 400rwhp, but who knows. RKD made 400 with 48lb injectors and something like 60lbs static fuel pressure, so who knows.

 

What? Where?

 

im running a 3.0bar fpr and some 55lb seimens injectors w/ russells chips- best move i ever made.

 

I'm looking at 48# injectors with an adjustable FPR...

Then, going to a K-27 DR turbo from Powerhaus, and of course the supporting chips...

according to the guy at PH, that should be more than enough to get me well above 300 WHP with the factory airbox.