Big enough injectors, E-85 compatible fuel pump. Lines and filter seem to be okay, though you may want to replace rubber components and the fuel filter to start out as clean and mechanically solid as possible.

Depending on what sort of power targets you have, somewhere between 720 and 1100cc injectors seem to be about right.

 

Plus 1 with mjannusch.

Most people suggest your fuel delivery set-up needs to be able to deliver 35% more fuel when using E-Fuel.

Marshall

 

Just curious, why would you want to run E85 on a daily driver?

 

so you can run 25PSI daily.

 

I have done several of these cars with no changes other than a pump upgrade for peace of mind, and appropriately oversized injectors (460ish). One of those cars has been daily driven that way now for over 4 years, no fuel related issues.

Obviously injector sizing depends on power goals and tuning...but to take a stock car with no fuel management and run E85, 460s are appropriate. An adjustable FPR helps to dial in the effective flow rate.

 

As a "bare minimum" experiment, I tuned a BPU VR-4 on Pump-E85 using stock injectors and stock fuel pump with 53psi base (~400cc's). The underhood fuel system was from my Panda, so it had the FueLab SS filter, lines, and FueLab AFPR.

The owner gets to daily drive on ethanol, and his car puts down 290//290 at 12psi lol! Granted, the car sees 21-22ms His appropriate upgrades on-hand are a Denso Supra FP and Delphi 550's.

 

I have the Chrome ECU and also have Denso 720 injectors.

Is tuning for E85 any different than tuning for regular 93 octane? It will need maybe 15% more fuel across the map?

 

More like 30% more fuel. You'll probably find you will need bigger injectors pretty quickly. 720s on E85 are good for about 450 crank hp @ 90% duty cycle, so if you want more than that then you'll need to upgrade. The sweet spot on our cars for E85 is around 1000cc.

 

If I don't plan on being in high boost all the time would meth injection be easier to use and tune for?

1000cc? Damn such a large injector. What if your not going to run e85 all the time? Can can you still run that large of an injector with chrome and 93 octane at a lower power level?

 

It might be, but then you've got the usual risks with doing separate fuel like that. If the meth system fails for some reason, you could lose the motor.

I can run 93 in my car with 1050cc injectors on Chrome with no problem. Just have to change the injector scaling and it is fine.

 

I'm looking at FIC 1100 Hi Impedance injectors, injector resistor bypass, and Wally E85 400 pump with install kit. I already have Chrome, and FP hotwire. My lines are stock and the filter is a couple years old. Anything else recommended?

 

just replace the filter with a new stock or wix one while you have things apart.

 

does anyone know if the hard fuel feed, return, and vapor lines are stainless? you know the ones running under the car? if not anyone have any issues with corrosion with them? also what rubber lines are you all using for the vapor return? i figured they would need replacing? like gates' barricade line? the rest of the vacuum system i'm sure needs no modification as there shouldn't be all that much fuel getting to those.

J

 

I've used all the stock lines and fuel system for that on E85. It has been 4 years and still no corrosion or leakage. I've had some really old E85 sit in there too and still no problems. I wouldn't change them out to aftermarket.

 

Stock filter too? I see Eric recommends aftermarket 10 micron stainless.

 

Stock filter too? I see Eric recommends aftermarket 6 micron fiberglass.

fixed

If you are upgrading to bigger lines, you'll like get an aftermarket filter. I'm turning people away from the 40 micron stainless that everyone used to say was the required filter. It's not good enough. The fiberglass filter element is the one to get if going aftermarket.

Like Forest said, if you stick with stock lines, then stock filter. I haven't done it myself, but others have including Ray.

 

The stock filter works fine and I'd say better than most of the aftermarket ones.

 

unnecessary, use the stabil for e85, works fine.

 

Since most cars have been on the E10 blend I would think some problems I saw in the past (instant filter clog) would not happen.
When you are pushing your system hard, cheap stock filters are a good thing to replace fairly often. You won't know they are a problem until you fail to get the fuel that you should be able to command. Cut that filter open and I had one totally collapsed.
One of my two external walbro 255's survived sitting 3 years full of untreated ethanol. Might have happened even with E10.

 

interesting stuff

 

Has anyone just added another pump, e.g., running two Walbro 341s, or one 341 and one 400, for the additional fuel demand? Is there anything wrong with running mis-matched pumps together?