Maybe if you learnt to type on a typewriter about 50 years ago
Indeed, this has come up before.
Outcome: Used to be the way, not for quite a long time now.
Why do people buy high octane petrol?
- Thread starter SlyReaper
- Start date
Indeed, this has come up before.
Outcome: Used to be the way, not for quite a long time now.
I knew the legislation on Bio fuel was about to change, but was not aware all existing fuel already contains 5% bioethanol.
On the Thorney Motorsport figures, I don't see any reason to suspect they are wrong. Their 2006 report shows Tesco 99 is producing marginally more power then Optimax 98, that is in turn producing marginally more power over BP 97. From BP 97 to regular 95 there is a large gap however.
[TW]Fox;20866242 said:
Ah of course, I don't (or didn't) mean that it accelerates less smoothly, but that it responds a little less quickly. And yes, as you've pointed out, the difference is small, but it is noticeable to me anyway.
Caporegime
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[TW]Fox;20866196 said:
Vs something like a turbo management system designed in the last 10 years it's going to be relatively simplistic.
Back to the Total range 50miles increase, we have a whole host of problems, right from how he calculates the fuel consumption right down to driving conditions, as we know any of the following can skew his results;
1) Direction of travel
2) Wind conditions
3) Water on the road
4) Traffic
5) Temperature
6) Tyre pressures
7) Distance of trips
To gain 50miles out of a tank he would have needed to have matched all of the above conditions whilst doing exactly the same trips over the two tanks, not to mention that he seems to fill up with whats at hand, going from 95ron to 98ron tank to tank isn't going to do the ecu mapping any favours, it takes a few tanks to notice any difference.
![[TW]Fox](/data/man-of-honor/2009.png){kind=avatar}
Am I reading this incorrectly or have you just called a non-6-cyl BMW engine lovely?
It's not the engines fault it's sat in a bay that should have a 6 pot in it
Caporegime
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Thorney is claiming large percentage power gains from small NA engines along with range increases, this is just total BS, you will see a power gain on a higher strung NA or FI car but hardly anything on a shopping trolley.
Caporegime
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Out of interest how have you gone on to record you consumption etc?
I'm only interested because at best i see a 2mpg gain over 95ron, sticking in 98 does indeed make the car run as intended and keeps the dashboard management lights at bay
Thorney are sponsored by Tesco Momentum 99 are they not? If not i'm fairly sure they used to be.
I'd certainly be highly sceptical of a test proclaiming Tesco 99 is the best fuel and you should buy it whenever possible that comes from a man who is paid large sums of money by Tesco.
I'd certainly be highly sceptical of a test proclaiming Tesco 99 is the best fuel and you should buy it whenever possible that comes from a man who is paid large sums of money by Tesco.
What testing / figures are you referring to ?
Yes. In sponsorship they also claim they race cars using Tesco 99.
Still does not mean their test results are incorrect.
Caporegime
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No tests i have at hand currently but I’ve seen dyno runs for 95ron vs 97 in supermini's and the difference really doesn't exist, the car simply can't take advantage of the higher Ron fuel to produce more power.
What sticks the nail in the coffin for Thorney is when you run something like a Golf GTI on the dyno with 95 vs 98 ron and the difference in power is less than Thorney is claiming for a supermini.
On a personal level i myself had two shopping trolleys, a 1.1 saxo and a 1.2 Clio, neither felt any different nor got any more mpg on super, my NA MX-5 felt marginally better on Super but didn't have any more power.
The above is nothing but Thorney protecting his business interests and keeping up to what we seem to know as his normal quality standards.
What sticks the nail in the coffin for Thorney is when you run something like a Golf GTI on the dyno with 95 vs 98 ron and the difference in power is less than Thorney is claiming for a supermini.
On a personal level i myself had two shopping trolleys, a 1.1 saxo and a 1.2 Clio, neither felt any different nor got any more mpg on super, my NA MX-5 felt marginally better on Super but didn't have any more power.
The above is nothing but Thorney protecting his business interests and keeping up to what we seem to know as his normal quality standards.
These ones:
http://www.tesco.com/Momentum99/files/Tesco-Momentum-99-Fuel-Report.pdf
Highlights include such scientific wonders as..
And figures like...
So we've got a Focus 1.6 that does only 29mpg yet almost 37 with 99?
I wonder what the more thirsty cars manage if a 1.6 Focus is pulling 29?
Oh, how strange. A 200bhp Audi TT that appears to do 5mpg more than a Focus 1.6? How odd. And the Audi is also almost as economical as a Corsa 1.2 Breeze?
It's just full of holes imho.
Soldato
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If they wanted to recommend the best fuel to avoid knocking it would be LPG. Dont think theres anything else as freely available.
I have read about 1 racing car tuned to take advantage but otherwise I never see it mentioned
The most noticeable difference should come from the car with the best power to weight ratio to start off with I think
The handbook for my car states it will run on 95 RON, but I have never used less than 97. I usually use V Power or Tesco 99 and never noticed a difference between either. I may give 95 RON a go to see it there is any noticeable difference.
What you will actually find is ECU's are capable of retarding the timing should they need to. They won't magically start advancing beyond the factory map (obviously)
So with this in mind there is little point in putting a higher RON fuel that the manufacturer recommends because no stock ECU that I know of will make use of it. (Under normal, unmodified running conditions)
(Obviously there are benefits in terms of cleaning agents etc in the higher RON fuels such as V-Power but thats a completely different debate
)Kind Regards
Alec
