[paradoxical3]

Originally Posted by Subaru335i

Not true. With the stock turbo flowing less than the N54's and with our newer HPFP most people don't have a problem with 100% E85 on the N55.
It seems like people just don't really see a benefit to using 100% E85 without a turbo upgrade which would bump up power enough where the stock HPFP might have trouble keeping up.

Sorry, I have countless logs to prove it.

Even on my stock turbo when I was boosting to 18psi in the midrange I would run out of fuel with 60% e85.

Now with my pure turbo upgrade, the situation is even worse. I can run 21psi on the turbo with 100 octane but the car just shits out in high RPM with a lot of e85. The pump simply can't keep up. With the pure turbo, the only guys who are really maxing it out are using meth to supplement fueling.

Running 100% e85 on the stock turbo will be dangerously lean in the high RPM range and you will likely throw codes and get fuel cutout/limp modes.

[Nugget]

You could possibly run 100% e85 on low boost though.
I remember reading someone did that to take advantage of the cooling benefits of e85 when tracking the car.

[paradoxical3]

Originally Posted by Nugget

You could possibly run 100% e85 on low boost though.
I remember reading someone did that to take advantage of the cooling benefits of e85 when tracking the car.

I don't get what the point of that would be though, the cooling of e85 happens in the combustion chamber so the ECU would not see lower intake temperatures and add timing or boost.

[Nugget]

He obviously wasn't after the most power, but I think the theory was he would get consistent power with low boost and high timing and be able to lap without overheating.

[PeterPure]

Originally Posted by paradoxical3

I don't get what the point of that would be though, the cooling of e85 happens in the combustion chamber so the ECU would not see lower intake temperatures and add timing or boost.

While no benefit to intake temps, it has benefits with egt's being a lot lower.

I see fuelling issues with just jb4 (no backend flash) + meth when running max boost and go over E45 mix. With lpfp replaced with walbro 450 it must be on the hpfp side. Now maybe a tune can help here.

I wonder what the car will do on just a flash without meth and E30 mix.

[JETmn]

Yes, you need an upgrade to the hpfp or the Motiv port injection to run 100% E85 right now and any decent boost levels. Even on the stock turbo E50 seems to be the limit when pushing it. I started running in to problems over E45 on the stock turbo and settled on E40. E40 seems to work good with the Pure also.

[Subaru335i]

It depends how healthy your HPFP is I guess.

[Nugget]

This log is e50 with FBO, stage 2 turbo and upgraded LPFP.
http://www.datazap.me/u/nugs/more-ma...4-10&zoom=1-51

In Terry's words "When fuel pressure falls below 8 it normally spells trouble".

[tke344]

In my experience, when running higher concentrations of E, above 50% I'd experience misfire like issues without any misfire codes. Logs never showed my AFR going lean but the requested load was dropping down to low double digit numbers. Seemed to be a fuel pressure related cutoff. After I realized what was going on, I started adjusting my target AFR table. After raising it from mid 11s tapering to 11 flat at high load, I started seeing improvements. After slowly making changes, I eliminated the issue when targeting 13.5 tapering to 13 at redline, this was at very high boost (20PSI in the midrange with 8 deg of advance). I know it's a little lean but we've seen much worse with guys running the JB4 before they had a backend flash or the FF wires.