Jtax05

Has anyone ran data or looked at the numbers For heat output gts turbos on e85 compared to m800s on 93? Just curious how significant the difference is. Obviously e85 runs cooler but enough to justify smaller turbos. Thanks

nomad13

I just installed m800s. I haven't got it fully tuned. For me it was that I don't have access to e85. I will be running meth/water injection as the tune evolves. I think that is more preferable route

AlexZTuned

I’m running M660’s with TiAL intercoolers. I’ve run 93 octane, full E85, and now a E40 blend. There was no difference whatsoever with intake air temperatures.

Ethanol does burn cooler and boosts octane, so there is a huge power difference over pump gas, but it does not help with IAT’s.

I’m currently installing a water/meth injection kit to solve the high temps - it’s proven on this platform to work extremely well with cooling off the intake charge.

DBH

Except for specific racing applications, why would anyone want to run E85?? High ethanol content is extremely corrosive and is more hydroscopic than brake fluid. Yes, I understand that some vehicles are designed to run E85, but Porshe is not one of them.

thesaintusa

Was this at all the same power output levels?

I would expect that at the same power the IAT would be lower with E85, but nobody would 'limit' the power that could be made, i.e. tune for near max power.

What would be nice to know would be the IAT at 500 rwhp runningr 93 octane, E40 and E85.
What appears to happen is that people tune for 500 rwhp (example) on 93, and then 600 rwhp on E85.

We don't have access to E85 where I live, but we do have access to 93 and 94 octane (ethanol free now). Until recently all of our 91 and 93 was E10.

desking101

Higher octane and lower cylinder head temps, which means more timing and more boost and more power

blackcheetah

We have 94oct fuel here and i run 100% meth i do mid 4sec 100-200 low 60-130 with does m800
The best imo E40 + 100%meth that would be a killer setup

4 Point 0

I know you’re just trolling, so sit there and eat your popcorn and maybe learn something.

I change my brake fluid about 4 times a year. I use F1 Brake fluid which is extremely hydroscopic and I never have an issue. You just donMt store it. You use it or throw it.

I have run E40 for 4 years straight with zero issues.
Unlike brake fluid, I change the tank 3 times in a day at the track. 🤣. Its never in there long enough to take on water.

It would only be an issue if you have a garage queen that sits for 3 months without being driven.

People who run E85 want power and typically DRIVE their cars. Frequently.


If you just sit in it and eat popcorn, then don’t bother running Ethanol. 🤣

MingusDew

All of your points are always valid, but you’re almost always the exception to the rule Most people aren’t you and don’t use their car at the same level as you, so for most of us mortals a more tempered approach to modifications is probably advisable. The trade off of increased maintenance is not worth it for those who rarely track and don’t want to deal with the compromise.

1CEBITN

Modern cars have no issues with E85. They are designed to handle ethanol because pretty much all pump gas in the US has 10% ethanol in it. You need to tune for it and ensure you have the fuel supply for it since you will need to pump more fuel than 93 octane requires. You can't just fill up with E85 and go running about. It is not corrosive in today's vehicles so folks really need to get out of the stone ages with that nonsense. E40 won't give you any issues even if you left it in the car for a couple weeks. E85 probably would have some water in it if you stored it for that long so probably not a good idea to do that. I ran E40 in my C7 Z06 for years without issues and it would sit in the garage for weeks at a time in the winter here but it was also my daily driver, not just a track queen. E40 was worth 60 rwhp on that car. For a $1k flex fuel sensor and a $500 tune that's pretty good bang for the buck. It isn't just appropriate for race cars, anyone who wants a very cheap, significant, bump in power is interested in it. Guys around here with Ford, GM, Audi, BMW, etc... cars are all running E85 tunes.

SpeedCircuit

Intake Air Temperature has nothing to do with the fuel you're burning.

@DBH - Virtually any combustion engine can benefit from E85. As long as the fuel system can support it, you will get drastic gains in power on a turbocharged car if it is tuned properly.

E85 being hydroscopic isn't very important if you're not letting the car sit for long periods of time.

DBH

Thanks to those who took my comments seriously and provided genuine responses. For those with thin skins (or failed to understand my original comments) the popcorn is for you to enjoy.

OBTW, I have "tweaked" every car I've ever owned, and I'm always interested in learning about improving performance for spirited street driving.

NiteJav

Bentley CGT's from 2009-2010ish onward are designed to run and take advantage of E85

AlexZTuned

Same output, same intake air temps. Ethanol can’t reduce the air coming in, but it burns cooler during combustion and has higher octane which both allows for more timing.

Water/Meth injection is the only effective solution to keeping IAT’s flat on this platform - even with the best intercoolers out there, the poor air flow makes heat soak a real problem.