Does anyone have experience on using 85 % ethanol fuel in HEMI 5.7? Normaly fuel injection engines just have to be modified to give extra fuel because of lower energy in E85. Where I am living, we have to pay 10 $ / gallon for regular 95E10 compared to E85 6$ /gallon. Even the consumption would be 30% more, it would be worth. I have tried 50/50 mixture of regular and E85 in my BMW, and it works perfectly without modifications.
Does anyone have experience on using 85 % ethanol fuel in HEMI 5.7? Normaly fuel injection engines just have to be modified to give extra fuel because of lower energy in E85. Where I am living, we have to pay 10 $ / gallon for regular 95E10 compared to E85 6$ /gallon. Even the consumption would be 30% more, it would be worth. I have tried 50/50 mixture of regular and E85 in my BMW, and it works perfectly without modifications.
My manual says more than 10% ethanol will void warranty. You might want to consider not using more than 10% ethanol.
DO NOT exceed 15%. A lot of the system components will fail or self destruct and you risk destroying you engine.
Running pure E85 requires higher capacity fuel pumpsand injectors. There are a lot of guys that drag race with E85 but they had to make a lot of changes.
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Using your number of 10 cents a gallon difference in cost for 89 octane; if you drive 12,000 miles a year, and if you average only 16 MPG, you use 750 gallons of gas per year. So your extra cost to use the correct 89 octane gas is $75.00 PER YEAR or $6.25 PER MONTH! If you drive 24,000 miles a year it will cost you an extra $12.50 a month to use the right gas!
You may not be able to feel it, but the car is set up for 89, and if you use 87 the knock sensors WILL tell the computer to retard timing and your performance will be affected. The manual says it's "ok" to use 87 and it will not damage the engine due to the knock sensors, but you will not get optimum performance.
One problem is people are not filling their tanks with 89-91 gas around here(SW Arlington Tx). Last week I filled up w/89(whole tank almost) and it quit running on me five times before I could get out of the Kroger parking lot. It finally smoothed out but I thought I was going to have to call our towing service. I have noticed a drop in performance. I think the gas was bad from sitting in the tank so long. Either that or the truck driver put bad gas in to start with.
I may put half a tank of 91-93 in it to bring performance back up to par...
Yesterday I filled up with 87 octane to test it out. I have the 5.7 hemi 2012. I drove it 200+ miles combined highway city and aveage based on the dash display 24.6 mpg and arrived home with over 1/2 tank remaining. I heard no knocking or ping however I did not use full throttle acceleration and was driving for fuel economy. For in town driving I use 91 but on the highway at steady cruise I saw NO difference on 87.
A long time ago I put the right gas in my IH 386 V8 ind it sounded like the engine was being damaged when accellerating. I drove very slowly in the mountains until I had half a tank so I could put some good gas in. Since then I always avoided Texago gas in California.
HKS
Quote:
Originally Posted by Hemi Man
One problem is people are not filling their tanks with 89-91 gas around here(SW Arlington Tx). Last week I filled up w/89(whole tank almost) and it quit running on me five times before I could get out of the Kroger parking lot. It finally smoothed out but I thought I was going to have to call our towing service. I have noticed a drop in performance. I think the gas was bad from sitting in the tank so long. Either that or the truck driver put bad gas in to start with.
I may put half a tank of 91-93 in it to bring performance back up to par...
A long time ago I put the right gas in my IH 386 V8 ind it sounded like the engine was being damaged when accellerating. I drove very slowly in the mountains until I had half a tank so I could put some good gas in. Since then I always avoided Texago gas in California.
HKS
I would NEVER use E85 in my car. Many cars will VOID the warranty if you run it and you are really setting yourself up for problems.
" A long time ago". cars didn't have pizoelectric sensors called knock sensors. Today if a car engine has the slightest amount of knock that your ear won't detect the knock sensor will send a signal to the PCM which which will retart the spark. This is how Chrysler can say 89 cotane preferred and 87 octane approved. The 87 is approved but the knock sensor may be doing more work. The older cars did not have this protection.
89 octane will giver more power under heavy throttle due to the advanced spark. But for what I tested 70 mph steady state on the highway I doubt the knock sensor did any work. When running lower octane just don't do too many burn outs. After all 87 octane is approved and does not void warranty.
I put 91 in my car. I don't know about you guys, but these cars were/are $40K+ when new, and they have big v8s. Why are we worried about a few pennies at the pump. If you want gas mileage, buy a Prius, if you want/have a full size sedan with a big motor, feed it properly. I hear guys on the vette forum all the time asking about gas mileage, I just shake my head.
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