Injectors for 800rwhp on E85

CMac455 · Jan 24, 2011

I calculated that I would need something around 140 lb/hr injectors to make 800rwhp. 750rwhp is more than likely what I'll be hovering around. I was just wondering what injectors people are running at what HP level and what your duty cycle is? I want to confirm my calculations based on your guy's testing.

I'm trying to decide whether I should buy 135 lb/hr injectors or 160 lb/hr injectors. If I go too large, then I wouldn't be able to tune for race fuel due to low pulsewidths that would take place with the 160 lb/hr injectors.

HighPSI · Jan 25, 2011

If you really plan on making 800rwhp on E85, I would strongly recommend 160# injectors. You could get away with 120# if you run the base pressure up. Of course this can really push the limits of your fuel pump. I'm not sure what you have for an ecu, but idling 160's on gasoline is do-able, provided you are running SEFI.

Hot Air · Jan 26, 2011

I sure do hope that you have a fuel supply system that is up to the task! You will want at least -10 supply and -8 return lines, top of the line big quality fuel pump, big fuel filters, and ample electrical supply to the pump. I would also recomment an electronic controller for the fuel pump so it can loaf along when not under boost.
Conrad

CMac455 · Jan 27, 2011

I currently have an A1000 fuel system, but I am using a -06AN return line. I figured using the smaller return line would keep the pressure up in the pre-regulator side. The more fuel that the motor uses, then the less restrictive the return line would be due to the increased amount of fuel being consumed by the motor.

I calculated that I need at least 620 lbs/hr of fuel flow, in order to make the number I'm looking for. The A1000 only flows about 450 lbs/hr at 70PSI and 13.5V. Those calculations don't include the amount of HP that you gain from the combustion efficiency/energy of E85 itself, though. It looks like I would need the Eliminator pump for E85 at 800rwhp, still. I'll max it out to see where I am with it.

HighPSI · Jan 27, 2011

I came up with nearly 700#/hr @800rwhp, but I run E-85 a little on the rich side and assumed a loose convertor. You could get away with a -8 feed line and -6 return

Hot Air · Jan 27, 2011

Your worst case for flow through the return line with an electric pump is at idle...unless you have an electronic controller for your fuel pump. If Cal says a -6 return will work, go with what he says as he has way more experience with E85 and hot street/strip cars.

I replaced my A1000 with the Eliminator pump in preparation for E85 becoming available in my part of NC. FWIW, we still don't have E85 in my county. Still waiting. When it does come, I will swap my 80-something pound/hr injectors for 120's and get an E85 tune. My dream is to integrate the GM fuel sensor into my fuel system and hook it up to my XFI and let XFI figure out the A/F and timing for E-85 or whatever I put into the tank. That will be cool! I just wish I could hook the power I have now on the street.
Conrad

87GN_70GS · Jan 27, 2011

I calculated closer to 130#/hr injectors and 640 #/hr of fuel

CMac455 · Jan 27, 2011

It really depends on what the BSFC of the motor is, for injectors. My motor's BSFC is .53, but I tend to call it .55 anyways. In the fuel pump calculation, I subtracted 50 HP from 920 bhp to get my number, for E85, just to account for the efficiency of the fuel. I also used a .70 BSFC to account for E85.

Also, I have a manual transmission. Has anyone ever ran the A1000 to its limits?

its2qik · Jan 28, 2011

If you plan to run E85 at that HP level there is absolutely no reason to not use 160lb injectors.

GNVYUS 1 · Jan 29, 2011

I saw you're looking into a new pump and you might want to check out what 2 DW301 pumps on E85 would do for your combo vs the Eliminator pump. The two DW's are not only a lot cheaper, but will flow a lot more and have a 3 year warranty on E85. The Eliminator isn't known for living a long life on gas, let a lone on E85. Even the Aero techs recommend two 1000's when applicable.

asloan5 · Jan 30, 2011

in reference to fuel line size. on a hard launch the inertia of the fuel in a #10 fuel line will cause a greater fuel pressure drop compared to #8 line. I had issues with fuel pressure drop at launch the front wheels would come up and pressure would dive then rebound and bring them back up again then finish the run ok. This was with a #8 line up to front of car. I actually had to move my fuel pump from being inline to sideways and this stopped the issue. If I was running a #10 line the problem I believe would have been more dramatic.

and X2 on 160lb injectors

Injectors for 800rwhp on E85

CMac455

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Hot Air

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CMac455

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Hot Air

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87GN_70GS

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asloan5

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