crookedvulture

iTrader: (3)

I think your right mate but so many people think otherwise.Like I said I cant see Tesco having there own petrol plant making there own blend 99 ron.
Some of the claims people make between the two are hilarious.

swaynie

iTrader: (6)

The difference between the fuels will be around 1hp if that. 99.9% of what people think they feel is a placebo effect.

Willowsdad

iTrader: (2)

Pulled this from another forum, seems to explain it well. Providing it's true anyway.

You will not notice a performance problem with Tesco's 99 RON unleaded. Badged as 'Tesco Momentum 99.

But the fuel itself is a basic 95 RON unleaded fuel laced with bioethanol to a maximum of 5% by mass. Ethanol is very good at inhibiting pre-ignition as it does raise the Research Octane Number of the fuel to which it is added. Tesco's petrol is produced by Greenergy. Or, at least, most of it is.

crookedvulture

iTrader: (3)

Like you say pulled from another forum so could be anyones guess?
Because as we all know there is a lot of horsesh!t that floats around in internet land.
Fact of the matter is that nobody really knows (except Shell & Tesco) & there must be a reason for that.So people make up there own theory.
All I know is that I will only put shell in my car if I can (luckily I live a mile from a shell garage) & will only use Tesco if I have no other choice.
I have noticed though that when I do use Tesco,according to my butt dyno I lose 14.6 bhp

LuckyWelshchap

I had mine remapped (by JGM) while running Momentum.

He calculated 348/358 before (I have got a dyno with the FSH showing 362/360) and 373/389 after. Haven't put it on a dyno yet though.

The car feels a little more responsive around the 2k mark (as said/implied the human body isn't going to perceive a consistent difference), but definitely produces more mpg, 22-24, against 20-21.
I ran 4 or 5 full tanks of each (leaving it down to around 5l in the tank) and the results were consistent.

Strange how some are better with V-Power/Nitro+ and others with Momentum. One of life's mysteries I suppose.

BoozyDave

iTrader: (8)

i can feel the difference

Mine runs poor on Nitro too

T99 is achieved with additives, Nitro is blended to 99 RON

i get more mpg with t99, 330bhp blob wrx. I did a 250 mile run using one each way, (Sheffield to Brighton), t99 was 36mpg on way there, nitro was 32mpg on the way home (IIRC) one reply said I got less back to Sheffield because i was going up hill

fpan

iTrader: (11)

SUL fuels are allowed to use up to 5% bioethanol.
As others have said they are both 99 octane and you would hardly notice any difference between the two.
Saying this the V-power "goes off" quicker IMHO.
I get better mpg with Tesco 99 which wouldn't make sense if T99 had more bioethanol than Nitro.
Also no phantom knock with T99 either.

LuckyWelshchap

And Momentum's cheaper.

Oh - and the missus just loves the Tesco Points I rack up for her

f1_fan

iTrader: (9)

This ^^^^^

If you can really tell the difference thne there's a few F1 teams who would like your input.

We should set up a blind test and see if these people can tell the difference when they don't know what it is first

rickya

iTrader: (18)

On the same dyno my JDM sti mapped by Dynamix made approx 5 bhp more when mapped for Vpower instead of Tesco 99. But there are so many other variables that may have caused that diff....make of that what you will!! lol

fpan

iTrader: (11)

^That.

JohnD

iTrader: (5)

But, was it on the same day? I know RR's compensate but humidity, temp. etc make a noticeable difference. As you say, make of it what you will,

Is Shell better at keeping the combustion chamber/valves cleaner?

JohnD

LuckyWelshchap

I don't know.
I didn't strip the engine after the differing fill-ups.

All joking (not sarcasm) aside the performance differences aren't going to be noticeable - or rather, provable - because of reasons already said.

The only factor is the mpg but then again sometimes I do more longer, 5th/6th runs on a tank than the commuter-style one-step, two-step ones, and at other times it's the opposite.

I'd say the key thing is not to worry about putting T99 in if you're low on Nitro+ and in a strange part of the world.

After all, I'm not concerned about putting a more expensive equivalent to Momentum in mine when I spy a Shell garage and the amber light's just come on

blackpoolrock

I mapped my old blob on v power - if it had tesco in it the engine light used to flick on when coming on boost

IainMilford

iTrader: (15)

Mine was mapped on V power, when I used to put Momentum in, I use to think the car felt slightly 'flat' and not quite as responsive, probably no real difference in power though.

tan v5sti

Recap..just went through my first tank of momentum and its definately done 25 to 30 miles less on a tank than v power..but running wise no diffrence really