smart51
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| posted on 19/10/05 at 05:40 PM |
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quote:
Originally posted by jimgiblett
quote:
Originally posted by smart51
[No, it can sometimes just be "not any more positive"
And that must be worth paying the extra pump price for !
 
Touche, as they say.
I can believe that good fuel will burn more cleanly than the cheap stuff but I readily accept that you won't met the power advantage unless your
engine is set up for it. I'm still interested to hear if it will bun more cleanly but I'll probably stick to the ordinary stuff. More
clean sound good for SVA emissions, that's what I was thinking.
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Fozzie
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| posted on 19/10/05 at 06:32 PM |
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quote:
Originally posted by Syd Bridge
Fozzie..That fuel supplied at LeMans is a loooooong way from normal pump fuel! And a lot closer to 100 octane avgas than they would have you
believe!!!
Absolutely Syd.............
David, can't give a comparison re the Ultima/Optimax, as I haven't had to put any(Ultima) in the fozzmobile yet! I agree with the choice
of plugs too. NGK everytime in all engines, haven't used owt else for years!
I must have a word with ChrisW, the 'notifications of new replies' thingy isn't working for me..
Fozzie
'Racing is Life!...anything before or after is just waiting'....Steve McQueen
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G.Man
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| posted on 24/10/05 at 07:53 AM |
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A lot of the higher octane fuels have oxygenators added to clean up the combustion...
These oxygenators act like mild nitrous oxide and on the dyno we have seen a few bhp increase accross the curve, but to utilise them properly you
normally need to richen the mixture very slightly..
Octane rating in itself does nothing for the fuel except let you run more advance, which is good, as almost every bike engine out there has an
ignition advance kit you can buy...
Or of course you can run a PC111R which allows ignition adjustment as well as fueling...
Every bike I have owned has run better on optimax, Yamaha Fazer thou, ZX6R and Duke 748...
Same views as the rest of you on NGK plugs...
No substitute in my eyes anymore for a bike...
Opinions are like backsides..
Everyone has one, nobody wants to hear it and only other peoples stink!
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andyharding
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| posted on 2/11/05 at 02:23 PM |
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In my old Pug 106 Xsi the engine ran the temp needles width lower with Optimax. This made the difference between the fan being on and off.
I have a Corolla T-Sport now which has the Lotus Exige engine in it with variable valve lift. With Optimax I can feel the surge of power come in much
harder. In fact if the road is anything but dry when I hit 6250RPM in 2nd gear the traction control kicks in until I change at 8200RPM!
Are you a Mac user or a retard?
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blueshift
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| posted on 3/11/05 at 09:30 PM |
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As I understand it you will only notice gains using higher octane fuel if you run more ignition advance, principle being more advance = more power,
and higher octane means you can run more advance before you start pinking (aka detonation aka knock).
Some cars, nasp as well as turbo, have a knock sensor which the ECU will read and retard the ignition if it detects knock. This should mean the ECU
can run maximum advance all the time, however; the ECU may only run up to a maximum target ignition advance value (for given revs, load etc), which
may not take full advantage of the fuel you put in.
More significantly the ECU may not try and re-learn its adaption values if you have driven the car for a while, then put in higher octane fuel -
meaning you will see no gains. It may require an ECU reset (disconnecting the battery for several minutes may do this).
Other advantages of premium fuels such as cleaning additives (and oxidising agents? first I'd heard of them..) may also be a factor, but the
octane rating alone is only of interest if you are tuning your ignition advance to suit.
I think it's also important to remember that psychology is a factor. many people are convinced by advertising that putting optimax in their car
will make it livelier, and convince themself that their car is faster / more responsive / sounds better / smells sweeter running optimax. Placebo
effect, if you will.
Then again, the detergents in the first tank of optimax they put through the engine probably did do it a favour, but that doesn't mean
it's worth running optimax all the time..
P.S. ooh! 1000 posts! go me! (to the garage instead of waffling)
[Edited on 3/11/05 by blueshift]
[Edited on 3/11/05 by blueshift]
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nicklondon
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| posted on 5/12/05 at 05:33 PM |
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Fuel test in the latest EVO mag
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