Which Petrol

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Originally Posted by gmonkey

i use 95 octane, but the fuel octane amount will make no difference in performance and little amount in economy in a 1.3 or 1.5ltr car.. but i dont mind spending bit more for something a bit cleaner.. dont trust bp ultimate anymore after they were caught mixing the standard and 95 together and selling it off as 98 :P dodgy to me

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It's not cleaner.

I was stating that the octane count you use in jazz is hardly worth while. if u use regular 91 or ultimate 98 it won't matter, you may produce one extra kilowatt.. and i'm stating this becuase as claymore said the ecu/igniton will correct for octane you use. And to rossw it is cleaner.. how do you come up with the idea it isnt??

Quote:

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Originally Posted by gmonkey

I was stating that the octane count you use in jazz is hardly worth while. if u use regular 91 or ultimate 98 it won't matter, you may produce one extra kilowatt.. and i'm stating this becuase as claymore said the ecu/igniton will correct for octane you use. And to rossw it is cleaner.. how do you come up with the idea it isnt??

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I think we have an onus of proof thing here.

You stated that higher octane fuel is cleaner. In the words of Wikipedia <CITATION NEEDED>
http://en.wikipedia.org/wiki/Octane_rating
http://www.racq.com.au/motoring_advi...h_octane_fuels
http://www.powerchipgroup.com/articles/PET0605.pdf
http://autospeed.com/cms/A_108935/article.html

The ONLY difference between different octane fuels is that - octane. They are all just as clean. They have the same scavenging agents in them to remove combustion products. They have the same energy content (except Shell Optimax - claimed to be slightly denser and E10, about 3% less energy content)

Anyone that tells you different is selling something.

So, yes, you're right it isn't worth putting 95 or 98 in your Jazz, unless you are like Claymore and want every last kW - cost no object, (although then why buy a Jazz? Just get a VW Polo GTI or a Mitsubishi Colt Ralliart), but your engine on any modern fuel will run very clean compared to what fuel used to be like.

The days of removing your head every few years to clean the carbon and lead residue out of it are gone (thank goodness - I must have spent hours doing that on my earlier cars)

i agree rossw 100&#37; why buy a jazz if you want performance, its isn't the right car in the price for it... and i agree with yes fuels are cleaner now days than they used to.. i remember the old mitsubishi colt on leaded :P.. But there is a difference in octanes for it's cleanness. An octane rating is its percentage of octane to heptane so 91 has 91% v 9%. heptane is a non-polar liquid used as a delivery agent for the octane. heptane doesnt run clean (i dont mean clean as in dirt clean i mean smooth/efficient). heptane burns faster and is more explosive and causes engine knocking (this is a proven fact), reduced amounts of heptane slows the burn-time and creates better perfomance. But yes sorry if you thought i meant clean as in it had sediments etc shoulda said smoother or something :P..

I use Shell V-Power and found it more responsive than others..but thats just me :) might have to try Mobil one day .. great info guys!