Fuel pressure on Idle and full boost GT35R

[fmb1987]

Hi guys!

Well, I'm running with GT35R, DSMLINK, ALL FORGED, METHANOL(ALCOHOL).

My question is: My fuel gauge shows me on idle 2kg/cm3 (29PSI), and on full boost (15PSI) it shows me 2.2kg/cm3 (34PSI).

Remember that I'm running on alcohol.

If it's wrong what should be my right pressure?

Thank you

Felipe

 

[thekellbeast]

Fuel pressure should be whatever your ECU expects to see. That's 43.5psi at idle with the vacuum line removed. Your fuel pressure regulator is boost referenced, so it raises at a 1:1 rate and maintains that same pressure over manifold pressure. With the line connected, your pressure should be around 39 at idle, and with 15psi, should be at 54psi.

What do you have for fuel mods anyways? If you're still running the stock pump, it can't flow enough fuel to keep up with the demands of a GT35R, especially against the higher fuel pressure.

 

[oldman]

Fuel pressure should be whatever your ECU expects to see. That's 43.5psi at idle with the vacuum line removed. Your fuel pressure regulator is boost referenced, so it raises at a 1:1 rate and maintains that same pressure over manifold pressure. With the line connected, your pressure should be around 39 at idle, and with 15psi, should be at 54psi.

What do you have for fuel mods anyways? If you're still running the stock pump, it can't flow enough fuel to keep up with the demands of a GT35R, especially against the higher fuel pressure.

Correct, unless you're pulling -29 in HG at idle, your base fuel pressure is way off although you can compensate via global as if you have smaller injectors, methanol injection doesn't make a difference in setting your base fuel pressure.

 

[fmb1987]

Dsmlink
1000cc Pte
2 X Walbro 255 HP
Bigger Lines

I see that I´m way lower than the right pressure, If i make a change on my FPR shall I change my settings on DSMLINK?

 

[thekellbeast]

DSMlink should be set for the factory base fuel pressure. I haven't been using DSMLink all that long, but there should be an option where you can set your base fuel pressure.

 

[oldman]

I see that I´m way lower than the right pressure, If i make a change on my FPR shall I change my settings on DSMLINK?

With fuel pressure set at 43.5 psi, your global should be -55% with deadtime of 315.