Compression on E85?
11:1 compression 378ci forged motor on e85 running a stock $100 ls1 crank making over 1000rwhp for a few thousand hard miles. No issues. Spools a T4 88mm turbo with minimal lag. In out area it varies from 78-85% depending upon station and time of year. I have an ethanol content meter to always let me know what I'm running. Typically you find a good station and they will consistently have high levels. Midwest in the winter the content goes down more then west coast as colder weather makes it harder to start an engine on a purer blend.
Just a little over $2/gal for 106 octane fuel is the best! If you buy a quality injector that can operate well at low DC then tuning is easier and idle/low end response is good until you really need the DC at higher boost levels.
Just a little over $2/gal for 106 octane fuel is the best! If you buy a quality injector that can operate well at low DC then tuning is easier and idle/low end response is good until you really need the DC at higher boost levels.
TECH Enthusiast
Joined: May 2011
Posts: 560
Likes: 11
I'm new to E85 as well, but my experiences have been spot on with what other guys have mentioned. The car was tuned with 83-84% Ethanol and the tuner left enough of a window to let it run well as low as 70% or so. The summer blend here is 86% consistently and the winter blend is 74-75% at its lowest. I bought a $15 E85 tester off of Summit and test the fuel every few fill-ups and have never had any tanks' content surprise me. Tune hasn't been altered and it has run great with anywhere from 74-86%. My application is a little different being a 10:1 LS7 and an overspun 2.9 Whipple, but I feel it speaks well to knock resistance of the corn fuel. I can generate A LOT of cylinder pressure at very low rpm and have no issues at all. If you have good access to E85, go for it!
It is hydroscopic meaning if not sealed tightly it will absorb moisture. I'd say tightly capped it should be fine for a few months.
Ansu or ID are the best. If you are super picky about driveability. If you just care about wot performance throw a dart and pick one.
Ansu or ID are the best. If you are super picky about driveability. If you just care about wot performance throw a dart and pick one.
Then price difference isn't nearly as bad for the 1500's as I assumed. I'll run ID's most likely.
9 Second Club
iTrader: (10)
Joined: Apr 2009
Posts: 1,230
Likes: 3
From: Joliet,IL and Las Vegas 50/50
#EthanolPoliceWon'tLikeThis #FlameSuiteOn #BlahBlahBlahImproperBlahBlahBlah2DaysMax
FWIW I store e85 in a 55 gallon polyurethane blue barrel and have absolutely no issues doing this over winter and into the following summer. Now i'm sure the ethanol police are going to light me up for not using a full stainless steel drum and only storing it for 3.75 days before it becomes useless and have to properly dispose of it, but that is what I do with a good deal of success. In October/November (when it's still 85+% ethanol) I fill the drum up and seal it tight. When spring comes along or during winter tuning days I use it without an issue. I've stored it up to 6-8 months at a time with no problem. Been doing this for 3 years now
#EthanolPoliceWon'tLikeThis #FlameSuiteOn #BlahBlahBlahImproperBlahBlahBlah2DaysMax
#EthanolPoliceWon'tLikeThis #FlameSuiteOn #BlahBlahBlahImproperBlahBlahBlah2DaysMax
Since nobody mentioned it I will. How well your engine will tolerate the change from E85 to something lower say E65 has just as much to do with boost as it does your tune.
If you tune for E85 at 25lbs of boost and you find yourself with no choice but to run E65 you can turn down the boost and still not worry about killing your engine. Unlike what some seem to think you will be running richer as the alcohol content drops but at the same time your chances of detonation rise. Keep the boost down until you get the fuel you are tuned for.
Also keep in mind that if you tune for E65 and run E85-E90 you will be running lean and the risk is higher that you will do permanent damage but you can always bring the alcohol content down by adding more gasoline.
If you tune for E85 at 25lbs of boost and you find yourself with no choice but to run E65 you can turn down the boost and still not worry about killing your engine. Unlike what some seem to think you will be running richer as the alcohol content drops but at the same time your chances of detonation rise. Keep the boost down until you get the fuel you are tuned for.
Also keep in mind that if you tune for E65 and run E85-E90 you will be running lean and the risk is higher that you will do permanent damage but you can always bring the alcohol content down by adding more gasoline.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Since nobody mentioned it I will. How well your engine will tolerate the change from E85 to something lower say E65 has just as much to do with boost as it does your tune.
If you tune for E85 at 25lbs of boost and you find yourself with no choice but to run E65 you can turn down the boost and still not worry about killing your engine. Unlike what some seem to think you will be running richer as the alcohol content drops but at the same time your chances of detonation rise. Keep the boost down until you get the fuel you are tuned for.
Also keep in mind that if you tune for E65 and run E85-E90 you will be running lean and the risk is higher that you will do permanent damage but you can always bring the alcohol content down by adding more gasoline.
If you tune for E85 at 25lbs of boost and you find yourself with no choice but to run E65 you can turn down the boost and still not worry about killing your engine. Unlike what some seem to think you will be running richer as the alcohol content drops but at the same time your chances of detonation rise. Keep the boost down until you get the fuel you are tuned for.
Also keep in mind that if you tune for E65 and run E85-E90 you will be running lean and the risk is higher that you will do permanent damage but you can always bring the alcohol content down by adding more gasoline.
Since nobody mentioned it I will. How well your engine will tolerate the change from E85 to something lower say E65 has just as much to do with boost as it does your tune.
If you tune for E85 at 25lbs of boost and you find yourself with no choice but to run E65 you can turn down the boost and still not worry about killing your engine. Unlike what some seem to think you will be running richer as the alcohol content drops but at the same time your chances of detonation rise.
If you tune for E85 at 25lbs of boost and you find yourself with no choice but to run E65 you can turn down the boost and still not worry about killing your engine. Unlike what some seem to think you will be running richer as the alcohol content drops but at the same time your chances of detonation rise.
The only way to alter compression while leaving the bottom end alone is using thinner or thicker head gaskets, altering block deck height, or milling your heads or swapping to a set with a lager or smaller combustion chamber. Depending on what direction you want your compression to move.
TECH Regular
Joined: Dec 2003
Posts: 405
Likes: 1
From: SOFLO
~10.7 ish' to 1 compression with a Maxed out 2.3 Whipple in my car.
Pump E85 and 95lb injectors in 110° F+ heat.
No issues. I would not go any higher than 10.5 to 1 compression for my next build. As mentioned previously in this thread, the tuning window becomes smaller and you can make more power with less compression and more boost vs. more compression less boost.
Also, I would keep the 4x4 in that truck. Should be fun.
Pump E85 and 95lb injectors in 110° F+ heat.
No issues. I would not go any higher than 10.5 to 1 compression for my next build. As mentioned previously in this thread, the tuning window becomes smaller and you can make more power with less compression and more boost vs. more compression less boost.
Also, I would keep the 4x4 in that truck. Should be fun.
Launching!
Joined: Mar 2009
Posts: 281
Likes: 0
From: Melbourne, Australia
The only way to alter compression while leaving the bottom end alone is using thinner or thicker head gaskets, altering block deck height, or milling your heads or swapping to a set with a lager or smaller combustion chamber. Depending on what direction you want your compression to move.