E50 Mix Questions

[m2cWW]

Hey guys! I'll be upgrading my turbo soon and have been reading about the limits of e85 on stock fueling. It seems to me that e50 has much less impact on the system as a whole while maintaining competitive times (@commanderwiggin you have been incredibly helpful). My question was what effect running the remainder of the tank on 91 vs on 100 would look like.
For example, would running 7 gallons of e85 (let's assume it has an ethanol rating of e85) and oxygenated 100 octane for the remaining 5 gallons (assuming roughly 10% ethanol) produce noticeably more power than running those 5 gallons as 91 pump gas? Or are we talking about minimal differences?

Second question: for running a setup like e50, what will need to be done to the car to keep things in good shape? Are lubricants necessary? How often should I run only pump gas? Filters? And when it comes to having a flex fuel tuning platform for incremental changes in ethanol content?

Any help would be much appreciated as I would love to get as much out of the new setup, without overloading the system, as possible without having to upgrade injectors, HPFP, LPFP, or deal with PI or methanol (although I am open to the last one, ideas regarding methanol would be helpful as well).

[TopJimmy]

Does using 100 instead of 91 help an E50 mix? Probably not unless your tuner is expecting it and they increased timing. Is your 100 "all gas"? If yes then a flex tune may see less alcohol and tune down a little. At $10+ a gallon it's definitely mot worth it.

Running a race gas tune? That gives high octane and doesn't overdrive HPFPs. It's worth it but very costly in fuel.

At E50 or flex tune there's no need to run just gas once in a while. Our DI don't really stick (misconception), high HPFP can cause them to break internally. Running gas or adding lube doesn't prevent it.

Just my $0.02

[hellokitty]

Bend Calibration flex fuel is the way to go.

Bend recommends having a fuel filter.

They also only recommend fuel additives made by Hot Shots Secret. I personally use gasoline extreme and LX4 for lubricity on full e85.

[m2cWW]

Originally Posted by TopJimmy

Does using 100 instead of 91 help an E50 mix? Probably not unless your tuner is expecting it and they increased timing. Is your 100 "all gas"? If yes then a flex tune may see less alcohol and tune down a little. At $10+ a gallon it's definitely mot worth it.

Running a race gas tune? That gives high octane and doesn't overdrive HPFPs. It's worth it but very costly in fuel.

At E50 or flex tune there's no need to run just gas once in a while. Our DI don't really stick (misconception), high HPFP can cause them to break internally. Running gas or adding lube doesn't prevent it.

Just my $0.02

Hey! Thanks very much for the info. It sounds like running a blend to achieve e50 won't overrun the injectors or the hpfp. Is that correct?

[TopJimmy]

Originally Posted by m2cWW

Hey! Thanks very much for the info. It sounds like running a blend to achieve e50 won't overrun the injectors or the hpfp. Is that correct?

At E50 and HF turbos…yes you will be maxing out HPFP pressure. This is same situation as E85 and stock turbos.

With HF turbos running E30 would have the HPFPs pressure in the no-risk zone for DI breaking.

[m2cWW]

Originally Posted by TopJimmy

At E50 and HF turbos…yes you will be maxing out HPFP pressure. This is same situation as E85 and stock turbos.

With HF turbos running E30 would have the HPFPs pressure in the no-risk zone for DI breaking.

Oh shoot…would the injectors be suffering at e50 as well?

[TopJimmy]

They don't suffer…they break or they don't. Im going for it. If one breaks running E then I buy one new FCP Euro.

An alternative is running RaceGas which would run your HPFPs at a more normal level.

[m2cWW]

Originally Posted by TopJimmy

They don't suffer…they break or they don't. Im going for it. If one breaks running E then I buy one new FCP Euro.

An alternative is running RaceGas which would run your HPFPs at a more normal level.

My man your help has been exactly what I needed. Much appreciated, I feel like I have a fuller idea of my options 👍

[hellokitty]

Originally Posted by m2cWW

My man your help has been exactly what I needed. Much appreciated, I feel like I have a fuller idea of my options 👍

I would also run hot shots lx4 if you are planning to run ethanol. 1.5 oz in every tank to prolong your fuel system life.

Also try to run pump gas through your system every month or two.

I've seen quite a few hpfp failures by not properly maintaining your fuel system by running E all the time.

With that said, S55s run dual hpfps and these pumps are much more expensive. You are looking at $2k just for the hpfps. Gotta pay to play, but just a heads up haha