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I have a 99 coupe with a LSx engine with a A&A supercharger with a 3.6 pulley. I was wondering which one is better choice E85 or Meth? Pro and Con on each
E85 is way better but more expensive You need bigger injectors and pumps, and maint can be a PITA if you don't drive it much
Flex fuel is way superior and best of both worlds. E85 quality varies.
Problem with meth kits can be, fuel distribution, and another source of failure if you are meth dependent, and if not, you leave some HP on the table.
but need to know a bit more about your combo, which blower? Hp goals, track or street.
IMHO The higher the hp, the more e85 makes more sense than meth injection.
Another topic, dual fuel. You run the stock injectors and pump gas, with another set of injectors on e85. Takes a fancy Nexxus or similar to do this, but it applies the boost juice when and where needed with great startup and off boost manners of pump gas.
holley makes the intakes and dual fuel rails that make this option much more viable and affordable. It's top tier though on the spend.
Everyone has already hit on what I would say in both threads in terms of E85/Flex fuel > methanol injection. Biggest issue/concern is the reliability of the water meth injection systems. I personally would not run a car that was dependent on water/methanol... I would only use such a system to spray a little WM on top of existing pump gas tune for cooling/extra safety margin only.
definitely e85. i would kill for it being awailable here.
on second thought, you dont need either with a 3.6 pulley. i have been driving a 3.08 for years on 98 ron/stock balancer. what gas is available to you?
actually the "effective" octate number seems to be done at 30% ethanol.
edit: "effective" including the cooling effect from latent heat.
Last edited by romandian; Dec 11, 2023 at 03:02 PM.
Everyone has already hit on what I would say in both threads in terms of E85/Flex fuel > methanol injection. Biggest issue/concern is the reliability of the water meth injection systems. I personally would not run a car that was dependent on water/methanol... I would only use such a system to spray a little WM on top of existing pump gas tune for cooling/extra safety margin only.
Even with the fast "safety systems" a pump failure on the meth dependent system can ruin your day. Also, squirting the meth in the up pipe leads to fuel distribution problems as the LS intakes are not designed for wet flow and have some nasty puddling issues
direct injection is SO much better and using the E85 as your base fuel is just easier, better, safer, simple. But it's NOT cheap. Size your injectors and fuel supply accordingly, you will need MUCH bigger 30% is where to start, go bigger still
And I agree you can tune for an E50 blend and probably still have plenty of power. What boost are you running at what CR?? E85 is a liquid intercooler also which helps keeping the high cylinder pressure from degrading into detonation.
With alchy injection, better make sure you even out all cylinders! We had 8 channel egt on a 1200 hp procharged car with twin nozzles up front. the cyl egt temp variation was really bad. we went direct port, evened it out, same amount of meth flow picked up 40 hp due to more even power from each cyl which is what you want.
yes, its more productive if the alcohol evaporates in the chamber. as the fuel in direct-injection engines. im led to believe the "intercooling" effect of pre-throttlebody injection is a myth. the air charge gets cooled but diluted by the alky vapor at the same time.
also i believe there is no fail-save at all. the engine will fail in a couple of revolutions. under 0.1 seconds. (there are system that are able to react to every firing event, but probably not relevant here.)
just curious what power level are u at or shooting for? and at what point do u need to add the meth or switch to e85? is it based off boost, compression or what determines when u need to upgrade?
No one ask this question after running e85 and boost.
Haha nice one and a true statement! Also I did not see anyone metion that its best to run new E85 compatible lines from the front to back. I went with 10AN feed and 8AN return... Dual 450's
Im a meth fan. I also like to drive my car when its running. Chasing e85 and getting 50% less mpg sucks. It really sucks. Meth sprays when you need it. Many like the great tuner Bret B aka BLOWNBLUEZ06 is a major advocate for meth and lots of it. You need a tuner that likes or love meth and knows how to tune failsafes in case there is an issue. I think Bret had a video one time of him turning off his meth in a middle of a pass and no problems but its a roll of the dice but so is boosting a car! Talk with Julio aka ALKY CONTROL prob the best kit around then Rodney @ PROMETH. If you go for meth which your motor will love make sure you do your research and you have a great tuner. My car will run around 20+ gph of meth. My cylinders will be happy and my smile will be huge.
Im a meth fan. I also like to drive my car when its running. Chasing e85 and getting 50% less mpg sucks. It really sucks. Meth sprays when you need it. Many like the great tuner Bret B aka BLOWNBLUEZ06 is a major advocate for meth and lots of it. You need a tuner that likes or love meth and knows how to tune failsafes in case there is an issue. I think Bret had a video one time of him turning off his meth in a middle of a pass and no problems but its a roll of the dice but so is boosting a car! Talk with Julio aka ALKY CONTROL prob the best kit around then Rodney @ PROMETH. If you go for meth which your motor will love make sure you do your research and you have a great tuner. My car will run around 20+ gph of meth. My cylinders will be happy and my smile will be huge.
e85 is one exit down from work for me, and I DD it. If there was any downside to flex fuel it is the giant fuel system, or leaving it in injectors sitting a while. But meth is another point of failure, if u trust the failsafes I guess ur good
E85 flex or alky methanol
