Super Fuels not worth it ?

Well of course its not worth it on a 1600 Focus shopping trolley, doh!

L0rdMike said:
Would rather use a super fuel then my engine blow up on me.
Click to expand...

Ditto, sure my MR2 Turbo has a knock sensor will adjust timing to suit lower grade petrol, but I'll be jiggered if I'm going to let the engine det before the ECU decides to adjust. V-Power all the way.
 
Sam said:
I was under the impression that if the car has a turbo your better off running it on super but that is prob crap ! I allways put the good stuff in my VX turbo, its not THAT much more expensive and makes me feel better ;)
Click to expand...

You are right, V-Power and Tesco 99 have far higher det resistance than lower grade petrols.
 
So, for example, an older car like mine (17 years old), 4 litre Jaguar XJS Sport, does that fall into the "older injection systems" category? Would I see any improvements from 97 RON as opposed to bog standard petrol?
 
Unless your car can adjust ignition timing on the fly, unlikely.

Its not the fuel delivery that makes a difference with fuels like this, its the ignition timing. At its most basic the higher octane, the more ignition timing you can run and the more power you will get.

That said even with self adjusting systems like those found on most of the popular jap imports, if the car has been run on lower grade petrol you have to reset the ECU to make it go back to the original timing map before you can take advantage of the better fuel, as these self adjusting systems are usually *very* slow to inrease timing back to the levels at which the engine will deliver extra power V-Power can yield.
 
I kind of do a combination thing on my vRS.
If for example I do a fill-up a week - I'll put regular unleaded in for 3 weeks and then a tank full of Super at the end of the month.

I'm not convinced it does anything - just something somebody once said to me on another forum.
 
What fuel does it say your car requires in the owners manual/behind the fuel cap?

If its 95/97, then you wont really get any benefit from using 99, other than V-Powers detergent effect.

If you had it remapped to run on 99 you would probably notice a difference.
 
stoofa said:
I kind of do a combination thing on my vRS.
If for example I do a fill-up a week - I'll put regular unleaded in for 3 weeks and then a tank full of Super at the end of the month.

I'm not convinced it does anything - just something somebody once said to me on another forum.
Click to expand...

Whats the point in that?

I would just use one or the other :confused:
 
My Aprilia RS50 used to run much smoother on Optimax, but my imported CBR400RR runs better on standard unleaded.

Out of interest, do you think I'd notice any benefits from running my UKDM(y0!) MR2 on V-power over normal unleaded?
 
Johno please? said:
Whats the point in that?

I would just use one or the other :confused:
Click to expand...

Honestly? I don't know.
I guess I'm working on the theory of "mixed fuels" so if you've got some 95 and some 99 then "maybe" all of your fuel is at around 97 :)

It is just something said on another forum when a similar thread popped up.
A couple of people said they used regular and then gave it a tank full of super every now and again - I'm guessing placibo, but until I'm too poor to do so I'll carry on.
 
West said:
I get better MPG out of the Cooper on 97.
Click to expand...

Zip said:
I get much better MPG with V power or BP ultimate.
Click to expand...

When you guys say you get better mpg by using the more expensive fuels, what sort of gains are you experiencing?

I've tried a few tanks back to back of the more expensive fuel variants in all my cars and noticed no difference whatsoever. 6-pot beemer may have run a little smoother, but I may have been imagining it.

What's the deal with the V-power diesel? Is it just extra detergents and a slightly higher cetane rating? Can some 'posh' diesel engines do the equivalent of advancing the timings to make use of it, or do things not work like that?

Cheers!
 
MrFunex said:
What's the deal with the V-power diesel? Is it just extra detergents and a slightly higher cetane rating? Can some 'posh' diesel engines do the equivalent of advancing the timings to make use of it, or do things not work like that?

Cheers!
Click to expand...

Diesel engines dont have timing like a petrol engine does. A petrol engine uses spark plugs to fire the fuel/air mixture. The ignition timing is the point in the combustion process where the spark is fired to ignite the mixture, measured in degrees before top dead centre.

A diesel engine for want of a better explanation works on detonation, or more accurately auto ignition. The combustion chamber is heated using a glow plug , basically a heated element, and along with the higher compression ratio of a diesel engine the fuel/air mixture self ignites when it is compressed.

And yup, V-Power diesel has a higher cetane rating than normal diesel, but how cetane ratings affect power potential I dont know I'm afraid.
 
You must log in or register to reply here.
Back
Top Bottom