What grade of fuel does everyone use?
#21
thanks,
that would be interesting
i guess that you have not had a
'Check Engine' light illuminate
while running 50/50 E85 blend in the past
maybe that is a rough indication
that the short and long fuel trims
available in the stock PCM computer
have been able in combination to adjust successfully
i would guess that if the oxygen sensors
can't stay near an average voltage of 0.5
the check engine light would eventually come on
very roughly
half of 14.7 (gasoline a/f ratio)
added to half of 9.0 (pure ethanol a/f ratio)
and divided by the original equipment setting of 14.7
is about 81%
so the Magnum V8 PCM computer
would have to adjust the stock fuel injectors to spray
at least 19% more
this article says 50/50 blend is possible on many modern EFI engines
http://en.wikipedia.org/wiki/E85_in_standard_engines
that would be interesting
i guess that you have not had a
'Check Engine' light illuminate
while running 50/50 E85 blend in the past
maybe that is a rough indication
that the short and long fuel trims
available in the stock PCM computer
have been able in combination to adjust successfully
i would guess that if the oxygen sensors
can't stay near an average voltage of 0.5
the check engine light would eventually come on
very roughly
half of 14.7 (gasoline a/f ratio)
added to half of 9.0 (pure ethanol a/f ratio)
and divided by the original equipment setting of 14.7
is about 81%
so the Magnum V8 PCM computer
would have to adjust the stock fuel injectors to spray
at least 19% more
this article says 50/50 blend is possible on many modern EFI engines
http://en.wikipedia.org/wiki/E85_in_standard_engines
You are correct - I have not gotten a CEL yet. In fact, I've run up to a 70/30 blend and not gotten a CEL (23% extra injector room). It started to get a bit tougher to cold start when temps were below 45 in the mornings, but nothing drastic. It took an extra second of cranking to catch, and then the RPMs were really low for another second or 2 till the engine really caught and idled properly. Also took a bit longer to warm up to operating temp something I also expected since E85 burns colder than gasoline.
Besides those minute things, I haven't noticed anything different when running even the 70/30 mixture. Of course, my MPG took a hit, but that's to be expected.
Next fill-up, I'm going to go for an 80/20 mix.
Random thought - I know the guy that wrote most of that wikipedia article you linked. He runs a Subaru WRX on E85 here in Colorado.
Last edited by Dark_Horse; 10-03-2008 at 05:12 PM.
#22
#23
#24
#25
Regular (non Eth) in the Ram.
You're not saving a dime buying the ethanol mixed gas. Ethanol mix reduces your MPG up to 30%.
I own 3 Daimler Chrysler products. All of them get better mileage out of the Regular.
My 5.9L gets 14-15 on premium, 12-13 on Reg, 09-10 on 10% eth.
My I6 XJ gets 19-20 on premium, 16-17 on Reg, 12-13 on 10% eth.
My I4 TJ gets 21-22 on premium, 18-19 on Reg, 15-16 on 10% eth.
These numbers were derived from numerous tanks of each type from 3 of the major gas chains here in my area. BP, Shell and QuikTrip.
You're not saving a dime buying the ethanol mixed gas. Ethanol mix reduces your MPG up to 30%.
I own 3 Daimler Chrysler products. All of them get better mileage out of the Regular.
My 5.9L gets 14-15 on premium, 12-13 on Reg, 09-10 on 10% eth.
My I6 XJ gets 19-20 on premium, 16-17 on Reg, 12-13 on 10% eth.
My I4 TJ gets 21-22 on premium, 18-19 on Reg, 15-16 on 10% eth.
These numbers were derived from numerous tanks of each type from 3 of the major gas chains here in my area. BP, Shell and QuikTrip.
#26
#28
Chrysler's official advice on why some premium gasoline is not always good
(but premium with high DI number is good)
http://dodgeram.info/tsb/1997/14-08-97.htm
(but premium with high DI number is good)
http://dodgeram.info/tsb/1997/14-08-97.htm
#29
This is what I have to say about that Chrysler BULL****!!! Spark knock is due to
1. Too high compression and not running enough octain in your fuel. (like a 10:5.1 engine and your runing 87 in it instead of 93)
2. Your timing is too far advanced
3. The engine was got too much carbon on the tops of the pistons due to running poor quality fuel. (this agin will raise your compression)
4. You have had your heads milled and put them back on (this will raise compression)
So who the hell is Chrysler trying to bull****?
That as bad as Chevrolet in the mid to late 80's claiming the the Pickups with side mounted saddle tanks will never pose a safety threat. I'm sorry you mount two 18-22gal gas tanks on the out side of the frame then the truck get broad sided the truck instantly become a rageing inferno and the driver gets BBQed.
1. Too high compression and not running enough octain in your fuel. (like a 10:5.1 engine and your runing 87 in it instead of 93)
2. Your timing is too far advanced
3. The engine was got too much carbon on the tops of the pistons due to running poor quality fuel. (this agin will raise your compression)
4. You have had your heads milled and put them back on (this will raise compression)
So who the hell is Chrysler trying to bull****?
That as bad as Chevrolet in the mid to late 80's claiming the the Pickups with side mounted saddle tanks will never pose a safety threat. I'm sorry you mount two 18-22gal gas tanks on the out side of the frame then the truck get broad sided the truck instantly become a rageing inferno and the driver gets BBQed.
#30
I run either 91 or 93 octane, depending on what the gas station offers. I have never experienced any knocking and the truck runs very smoothly. To me, it's a minimal expense to play it safe and pay for the higher grade fuel. It did suck, however, when high octane was costing $4.30 a gallon, now it's back to $3.60 around here. My MPGs still suck as usual though. I am getting 11-12 city, and 14-15 on the highway. This is why I want 33/12.5/17 tires now, the 285s have not yielded me anything worth bragging about compared to the 35" tires besides a smoother and safer ride.