Quote:
Originally Posted by whipplem104
my car on e85 at 85psi. I run around 10-11 psi of boost.
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so you run a base pressure of 85 - 11 = 74 psi?????????
this is probbably where your timing issues are, you have posted before about how others are running more timing than you, i dont think you are getting enough fuel.
whilst i was experiancing weird tuning issues, random pinking, days when the car would fly, then days when it wouldnt, i did everything but change my feul pump, guess what? when i eventually got to the '044' (via 345lph pumps by driven automotive wich failed twice), i now have soild feul pressure, and soild tune that doesnt change,
i fitted my pressure gauge inside the car so i could watch the pressure rise as boost builds.
the '044' was designed for porshe turbos, and is as reliable as a oem pump.
the relitave flow rates in 'free flow' are; 044 is 300 lph, walbro 255 is... 255lph, these figures are free flow, ie without any lines and injectors.
the '044' according to the many web pages i have visited, consistantly out performs the walbro and the more pressure you run, the more the '044' come into its own.
i took the check valve off the driven automative pump, but when you think about it, they all come with a check valve, and surely the designers saw the small holes? they must have allowed for it.
the hole i have identified above is on the non pressured side, that is to say the only thing pushin the feul thro it is gravity, that is why it is the restriction in the system, but with your pump walbro, you dont need to worry...