Would Walbro 190/255 make a difference with a enthalpy tune?

[jmwenick]

Hey guys, I have an enthalpy tune, and I've been running about 60 psi of fuel pressure to have a decent afr all across the board. My question is, can an Enthalpy tune be set for a Walbro 255? Would my walbro 190 be the cause of me having to run higher fuel pressure? Let me know. Thanks

[hannibal]

Heres a chart showing what flow rates Walbro pumps can support at certain pressures.http://www.autoperformanceengi....html

[jmwenick]

I still don't get it. I guess what i'm asking is; If I replace my 190 with a 255, can I lower my fuel pressure, and get the same AFR's?

[NateDogg]

No.

Fuel pressure determines the volume of fuel being shot through the injectors.

Enthalpy tunes for 50psi at idle, so you should get him to send you a new tune or maybe you have vacuum leaks. What is your idle vacuum?

[jmwenick]

20 vacuum. I think i will have to get an safc and fine tune. Thanks