OK... so let's say I have an EJ25 running E85 that is making 500 crank. Are there any rule of thumb calculators for how much fuel pump I need? I have a fuel pump verified to push a bit over 200lph @ 90 PSI (worst case scenario being ~60-70 psi base pressure +25 psi boost). So without going into convoluted BSFC formulas, is there any way to eyeball how much E85 I need to be able to flow to support 400WHP/500 crank? I have plenty of injector (ID1000's)
Walbro fuel pumps suck at high pressure... and even if it didn't you would need atleast two to make 500hp on e85
My math says around 237 lph on E85. But that 200 lph is assuming that you have to jack up the base pressure to 60-70 psi, which I don't think you need to do. I think it will stay around the 250 lph range to be honest. That is based off the 1000 hp pump as I could not quite remember the one you got off the top of my head.
Your only looking to make 400whp correct? We do that on single walbros all the time. 500whp is a different story as Doug say. I am not sure what your running now, and I don't have time to do the math, but I know a single walbro will be just fine
I will not be running a Walbro. I had one die and an AVO that is now questionable. Top Secret fuel system to be exposed later. It's mostly my madness with some Killshot thrown in for good measure. If it works, I'm a genius; otherwise all the geniuses on the board can throw stones when I fail. LOL. E85 is probably coming later anyway. I need to get it running 100% on pump first.
Details Ahh what the hell... Basics: -8 from the pump to the rails to the regulator. -6 return HARDWARE: Fuel lab 41401 going in tank (I did NOT want a surge tank setup). A certain other member has been working with Fuelab and I figured what the hell- spoke w/ Brian in Fuelab Engineering at Fuelab about 1/2 a dozen times; we believe there is no reason this pump will not do extremely well in tank. Should push fuel equal to dual Bosch 044's. PWM control to come later (Fuelab working on controller now- basically you could use any 0-5V input to control the pump speed - i.e boost- so you are only pumping as much fuel as needed- pseudo returnless system) http://www.fuelab.com/index.php?pag...&category_id=1&option=com_virtuemart&Itemid=3 Fuelab in-tank non-collapsible 75 micron sock and adapter 83801 Earl's Check Valve- Andy recommended and approved! Fuelab 6 micron 5" long fiberglass filter 82832- new product approved for E85- paper filters are no good for E85 and it's tough to find fine mesh SS filters with high flow rates. Aeromotive 14134 top feed rails Weldon 2040 FPR- Andy recommended and approved (Weldon was not even on my radar- there stuff is OEM-like durability with huge capability, bigger in the domestic drag market but really nice stuff) Other details: All hard lines under the car. Fittings will be Red Horse Performance (Andy recommended)- cheaper than the Aeroquip stuff I was looking at (THX ANDY!) XRP makes some nice stuff too. I learned Earl's and Aeroquip are NOT the only options for AN plumbing fittings- LOL. -AN hose..... I have suffered for almost 2 weeks on this desicion. Andy really likes Earl's stainless braided hoses. This car is a daily driver and my wife and 18 mos old daughter, so safety is paramount. Speaking with Earl's they could not recommend their Performoflex or Autoflex SS lines as they had reported trouble with E85 over time- they recommended only Speedflex (ususally for brake lines) or Ultraflex 650 (both are teflon lined hoses). The Speedflex fittings are slim product line with limited hose end options and are specific to Speed flex due to unusual ID/OD for the hose ends. The Ultraflex Hose is $28/foot in a -8 and a single 180 degree hose end in -8 is over $40!!! Not economically feasible- LOL! So I acted like a little bitch to Andy and kept looking. LOL. (sorry Andy) as my daughter says when she does something wrong... "Hugs?" I spent a bunch of time speaking with Earl's/Aeroquip/Aeromotive/Gates/Goodridge/others I can't even remember all the people I talked to. Also spoke with Revolutions Performance in Colorado (they were one of the first tuners to actively promote E85 in the Subaru world ~8 years ago). They recommended best sucess with Aeroquip FBA Stainless Braid lines with their AQP synthetic rubber. It turns out Aeroquip was the ONLY major SS braid hose manufacturer I spoke with who confirmed excellent compatibility with ethanol/E85. Hope this long diatribe helps somebody, but fuel system decisions are tough and Killshot has been very helpful in assisting me with design of this system. Should be installed by Andy@Killshot next week and final tune by Mike@Killshot in mid-September.