Desired and rail fuel pressure

[ip-alpha]

2014 Stingray LT1 fitted with a supercharger, intake, headers and full exhaust without cats. Is this what I should expect from Desired Fuel Pressure and Fuel Rail Pressure on this application? The GM direct injection is very new to me. Thanks for any and all input

fuel.jpg

[Road]

Nope post up your tune and a good log maybe one of the experienced boosted ones will help out.

[Higgs Boson]

measure it against RPM

you can boost commanded rail pressure

you can adjust your Start of Injection Timing to give it more time to get the fuel in

[ip-alpha]

measure it against RPM

you can boost commanded rail pressure

you can adjust your Start of Injection Timing to give it more time to get the fuel in

I can e-mail the log.

fuel-rpm.jpg

fuel-rpm-2.jpg

Is boosting commanded rail pressure a band-aid to an issue here?

[Higgs Boson]

first thing to adjust is SOI.

your Duty cycle is maxed around 35% on these cars, your second shot shows 27% at 4800 RPM

[DSteck]

first thing to adjust is SOI.

your Duty cycle is maxed around 35% on these cars, your second shot shows 27% at 4800 RPM

35% is not maxed out. The ECM will clip you to 350° which is 48.6%. You can safely get into the low 40s and not have it run like crap.

[Higgs Boson]

Good to know, thanks Steck. Is low 40s like the old 100% and 35% like the old 85%? I haven't maxed one out yet but it seems like many are seeing 35% as a max, but possibly with stock SOI values....your thoughts...?

[DSteck]

There's no set rule. DI is totally different.

[Higgs Boson]

Any elaboration?

Where are you seeing injectors maxed vs HPFP or in tank?

I've heard in tank is good to around 800-815 rwhp