NZ951

yeah no doubt E85 is a better fuel all day long. You will make more power with it.

I dont use it on the track car as I dont much fancy draining it out after every event.

Paulyy

i haven't heard any stories needing to drain it out on a 951? or you're talking about the ae86

NZ951

You will need to drain it in any car thats not run frequently... Ethanol is very hygroscopic (about 50 times more so than gas), which for obvious reasons is bad as a fuel source, and is slightly more corrosive than pump gas because of it. But my issue with Ethanol is cork gaskets (like in the level sender in my RCI fuel cell), and the high level of water the fuel in a car not run frequently...

NZ951

Sorry yes, in the AE86...

NZ951

http://www.fuel-testers.com/marine_b..._problems.html

Marine applications but you get the idea.

Paulyy

well since theres a few R'listers including josh who have been on e85 for the past 3 or so years, no bad stories so for the 951 its a major plus. i've seen a few run over 20 psi on their 951 with no horror stories. only problem is availability. and the fact you need to run more fuel which means more fuel stops

Paulyy

That's a good link!

Rogue_Ant

I've been running pretty much straight E85 for 5+years... Including storing my car for a year at one point (without draining the fuel). Granted, I live in a dry climate - but if you are driving your car fairly regularly, then there is no need to drain the ethanol.

If you drive your car on a lake/ocean, then I might reconsider this position

The 80# injectors, assuming you are not pump limited, are good for ~425-450rwhp on E85.

The octane rating between countries is different.
AU = RON
US = AKI (RON + MON) / 2

Typically, your premium is about the same as ours. So, 98RON is equivalent to ~93AKI. As such, I recommend and limit the Tunes to a certain boost pressure. What I recommend is what I consider safe or reasonable. I have mapped fuel and timing up to the 3Bar MAP sensor limit of ~29psi, however on pump gasoline I consider boost pressures that to be unreasonable. The amount of timing reduction needed to keep knock in check is counter-productive, and can result in dangerous EGTs.
NZ - as many know, I am not afraid to push the limits in my own car. I do so regularly for testing. And, I applaud you for being even more audacious than me. But, that is simply not something I am willing to risk for customers cars.

The right way, as far as I am concerned, is to match the system as best as possible. This means a known, good quality high-octane fuel for those wanting to push the boost pressures higher.

NZ951

For my track car its on the edge, (175WHP from 1600cc N/A) so I dont take risks with the fuel. For a daily driver on E85 I would run it all day long and not worry about it.

Agree on the philosophy on dealing with the tuning, you cant for a number of reasons go to the edge on a chip tune off the shelf (meaning not on the dyno).

blown 944

Just an FYI regarding letting e85 sit for extended periods of time. My black car sat for a few months without starting it. My gold car sat for well over a year and it had no problems.

Black51

Did you fill the tank right up when leaving it sit for awhile?

NZ951

Yeah I guess you would find that on cars that are not sensitive to a decent drop in octane from the fuel being left for so long, I doubt my race engine would last 5 laps with 3 less octane points.

Rogue_Ant

Do you mean before storing it, or after retrieving it from storage...?

Honestly, I don't recall - which probably means I didn't do anything special.

Paulyy

I just want to recap.
With the factory pump. How much boost can I run with my setup?

I feel like putting e85 in my tank tonight as my ODO it working and want to see my MPG.

dmcampbell

Pauly: I am running an M-tune e85 tune with an 044 Pump and Fuel Lab adj FPR set at about 45-47lbs, and have set the eBoost EBC over boost at 20.5psi. Unfortunately this last weekend the car kept overboosting and I did not record any knocks on my knock counter. All the while WB O2's were in the high 11's when in 3rd, 4th, or 5th gears WOT. Assuming you have a WB O2 and an adj FPR, I would first set the FPR to 45llbs at idle w/ no vacuum. Then, as you have suggested, I would slowly increase boost by 1psi at a time while monitoring O2 readings and stop at about 12afr as described above. I believe that would be your safe limit. B/T/W, the Rogue logger is a great tool for this purpose as long as you have a WB O2 tied in. Mike