E5 question...

M

Milo

Sunday Drivers
Has anybody done any dynamometer measurements on same engine running on standard RON95 petrol and on Maxol's E5? E5 has a higher octane rating, which it is only a measure of the fuel's tendency to burn in a controlled manner rather than exploding in an uncontrolled manner. Octane rating does not relate to the energy content of the fuel. In fact, RON is raised by blending in ethanol, energy content per volume is reduced…I was just wondering whether E5 gives a real performace/power advantage or is it just a “snake oil” along these terms- real data would answer it beyond anecdotal evidence….
 
we just got e5 in cork a few weeks back and im using it for the past 2 weeks and i can honestly say i can feel a difference in performance.............
 
Milo said:
Has anybody done any dynamometer measurements on same engine running on standard RON95 petrol and on Maxol's E5? E5 has a higher octane rating, which it is only a measure of the fuel's tendency to burn in a controlled manner rather than exploding in an uncontrolled manner. Octane rating does not relate to the energy content of the fuel. In fact, RON is raised by blending in ethanol, energy content per volume is reduced…I was just wondering whether E5 gives a real performace/power advantage or is it just a “snake oil” along these terms- real data would answer it beyond anecdotal evidence….
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Energy content doesn't matter it doesn't have any bearing on how much power the engine produces...the fact that a fuel has a higher RON rating means you can run more fuel into the cylinder and thus more air..allowing you to advance the engine timing and as a result create more power.
What you talking about is the calorific content of the fuel...and your right it is actually lower in ethanol than in petrol...you will get better mileage with petrol..but ethanol has a lubricating effect much like an octane booster. Everyone was dubious when it first came out that only 5% would have an effect on the fuel but its is noticeable..anyone who's had their car mapped with it will tell you and results have been proven.
The strict definition of RON is the fuels resistance to producing knock or detonation, this is what causes cylinder failure so the higher the RON value to more timing the more power
 
JOHNNY T said:
we just got e5 in cork a few weeks back and im using it for the past 2 weeks and i can honestly say i can feel a difference in performance.............
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At which Maxol garage, Johnny? :|

That's fantastic news! !!

EDIT: Just had a look on the Maxol website and the garage in Blackpool has it too.. :dance: Can't wait to get my scooby back on the road..
 
blackpool and the one on the lower glanmire road by kevin o learys garge has it for definate.....
i dont know about the other maxol garges peter but id say they all have it at this stage....
happy days :dance:
 
bandriszal said:
And applegreen Has it as well. http://applegreen.ie/fuels altought they don't say it's 99ron but I think E5 is 99ron anywhere. Is that correct?
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been running the applegreen e5 for the last two weeks and glad to say no different to maxol , same mpg , no lumpy driving like i was getting on shell/topaz
 
Been using E5 since it came out and the odd time I was stuck and had to fill up with "normal" fuel. Can hostly say I felt no difference in cars performance.
 
AndyC said:
Been using E5 since it came out and the odd time I was stuck and had to fill up with "normal" fuel. Can hostly say I felt no difference in cars performance.
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Isnt your car mapped for 95?
 
Sweetcakes said:
Isnt your car mapped for 95?
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It is Robbie. Car feels no different with E5 in it. E5 wasnt around when I had it mapped.
 
AndyC said:
Sweetcakes said:
Isnt your car mapped for 95?
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It is Robbie. Car feels no different with E5 in it. E5 wasnt around when I had it mapped.
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Thats because your ecu is not adjusting for the higher octane as its been mapped and set for the lower octane I'd bet you any money with an ecu tweek you could make more boost and more timing with E5.
 
As dave said andy, if you tweaked it for E5, you'd notice the difference alright but because your car is mapped for 95, you won't see the difference. You could put sunoco race fuel in and it would still be the same. :thumbsup:

Excuse for a couple of mods and a tweak maybe :whistle: :icon_grin:
 
Sweetcakes said:
Excuse for a couple of mods and a tweak maybe :whistle: :icon_grin:
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Yeah hoping to get decat and remap once I get the NCT done later in the year.
 
have my 2c of worth to add. after several tanks of e5 i have the following observations:
1. the mileage has improved by ~10%. i would expect it to be the other way around because e5 is a lower calorific value fuel but the numbers say what they say…
2. i could not say about any improvements performance wise but i would not expect any noticeable differences there anyway
question to people in the know. does subaru have a "self learning/programming" ecu that would adjust to the type of fuel, driving style etc.?
 
Milo said:
have my 2c of worth to add. after several tanks of e5 i have the following observations:
1. the mileage has improved by ~10%. i would expect it to be the other way around because e5 is a lower calorific value fuel but the numbers say what they say…
2. i could not say about any improvements performance wise but i would not expect any noticeable differences there anyway
question to people in the know. does subaru have a "self learning/programming" ecu that would adjust to the type of fuel, driving style etc.?
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1. the 5% ethanol would be negligible to the overall calorific value.
2. I never heard of any self learning but the ecu will adjust timing using the knock sensor.

What type of car have you got? if its an N/A your not going to notice any difference
 
Dagnut said:
Milo said:
have my 2c of worth to add. after several tanks of e5 i have the following observations:
1. the mileage has improved by ~10%. i would expect it to be the other way around because e5 is a lower calorific value fuel but the numbers say what they say…
2. i could not say about any improvements performance wise but i would not expect any noticeable differences there anyway
question to people in the know. does subaru have a "self learning/programming" ecu that would adjust to the type of fuel, driving style etc.?
Click to expand...

1. the 5% ethanol would be negligible to the overall calorific value.
2. I never heard of any self learning but the ecu will adjust timing using the knock sensor.
What type of car have you got? if its an N/A your not going to notice any difference
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just heard that some cars have a self learning/adjusting ecu that "learns from" and adjusts to driving style, fuel etc. - open for correction here
bog standard ej204 in a forester- would not expect any difference either- neither better nor worse- good as always- just a tad better mileage
 
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