Fuel Test Results ( UK DRIVERS )

Pirate Neilsouth

Pirate Neilsouth

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http://www.thorneymotorsport.co.uk/...php?type=News&subtitle=0&title=0&text=0&toc=1

It is clear from the testing that whilst older engines show a clear benefit of running higher octane fuel, more modern, sophisticated engines have the ability to advance their fuel timing to take full advantage of this enhancement to a far greater degree. For the BMW M3 CSL the difference between running 95 octane fuel and Tesco 99 Octane fuel was over 40bhp, that’s over 10%.

It is our fundamental belief and now our clear recommendation to our customers that if they want to maximize the power of their cars, before they even consider using our services to enhance the power of their car further, they should use the best fuel they can buy. The simple fact borne out of our extensive test is that using Tesco 99 Octane fuel will make your car more powerful. It will feel faster, accelerate faster and perform better. If you’re going to tune your car at least give it the best fuel it can run on and in our opinion, based on extensive testing that fuel is Tesco 99 Octane.
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:D
 
Theoretically, this makes no sense whatsoever.

Engines are tuned on a certain octane, higher octane rating fuel will not do anything without a proper tune to advance ignition or lean out fuelling... or if forced induction, increased boost.
 
_TiTaNiuM said:
Theoretically, this makes no sense whatsoever.

Engines are tuned on a certain octane, higher octane rating fuel will not do anything without a proper tune to advance ignition or lean out fuelling... or if forced induction, increased boost.
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same thing i was thinking when i read that...
 
_TiTaNiuM said:
Theoretically, this makes no sense whatsoever.

Engines are tuned on a certain octane, higher octane rating fuel will not do anything without a proper tune to advance ignition or lean out fuelling... or if forced induction, increased boost.
Click to expand...

spark advance! cars are tuned to run a certain octane, but most efi cars have an ecu that can advance or retard the timing based off the knock sensor, although it should just run off the base maps on WOT anyway and disregard that info, so it only means better fuel economy. that m3 was probably pinging badly on 95 and hence the drop in power. i know my old car would certainly lose power on normal unleaded, and probably also a piston (10.2:1 compression).
so you are correct
 
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The owner must have been running 87 or something and the ECU tuned everything back to stop knock :bleh:

However, the return to power should take several hundred miles, I know the subaru ECU's generally take 200-500 miles to increase the ignition advance multiplier, without doing some tricky things.
 
isn't UK 95 RON like 90 US (R+M)/2

your not suppose to run those cars on anything less than 91 (R+M)/2 in the US and they do run better on 93 (R+M)/2

i think they need to test some crap cars.
 
110 octane here is about $5.50/gal

I had the subie tuned to 103 so i mix about 1.1/1 110/93 to get about 103 octane. Good stuff
 
avgas = bad bad bad

I hear they use a lot of "off color" additives, and by off color I mean, bad juju.

Its really only good for older cars looking for leaded fuel to reduce knock.

I think the main thing behind not using av gas is that its designed for engines that hit rpm, and maintain it, but that could go to the engine as being a design thing too.

I looked into it a bit before deciding to go with straight race gas/mix, and the additives just turned me off.

Besides, you can only get 100LL here, that wouldn't meet my needs anyway.
 
Must be different blend to our stuff then? 115 octane this, basically toluene type additives to a 105 base, think you can get 105 though, which is basically 98ron basestock with all those dodgy additives, is that what you guys can get?
 
i have to check the pumps next time I'm at the airport, i'm not sure. I just read that av gas wasn't a great route to go, and the one I went is safer and not that expensive. comes out to about 4.00-4.50 a gallon for me to mix 93 and 110 ((R+M)/2 method)
 
Comes out about £4 ($8) a litre for nitro....:eek:

Although I usually mix 5:1 with the rest of the fuel.
 
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squid said:
most efi cars have an ecu that can advance or retard the timing based off the knock sensor, although it should just run off the base maps on WOT anyway and disregard that info, so it only means better fuel economy. that m3 was probably pinging badly on 95 and hence the drop in power.
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This was more or less my suspicion based on the cursory information available.
 
If you read it it says they've fiddled with the map - so the ignition timing will be on the edge for the high octane fuel.
 
Just out wonder how old is this article/

BP Ultimate 102 ron
Tesco Super Unleaded 99 ron
Asda Super Unleaded ?
Shell Super Unleaded ?

if someone could fill the blanks it would be most appreciated
 
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