Tesco Momentum 99...am I imagining this

[AJP]

@AJP I have no idea - I haven't visited rtech yet!

But yes your right it would make no sense to go back to 95 Ron. I just went on reading posts that a lot of people said you need 99 in your tank when visiting them.

But even still on my stock car I only use 99 Ron now 

Good, keep it that way

When I bought mine it got noticeably smoother and quicker after a few miles on V Power. I got the feeling it'd been run on the cheap stuff before I got hold of it. No good even for a standard car.

[Kezma]

I was told recently that tesco momentum had a higher ethanol content than vpower? Someone may be able to explain that one, but around me momentum is approx 4p cheaper so im inclined to change as im using vpower currently

[Dan_FR]

That's always been the 'story'. Ethanol has a much higher resistance to ignition than petrol so is great for increasing the RON value of a lesser fuel cheaply and easily. The downside is there isn't as much energy in an ethanol burn, and more of it if required, which is why the top fuel alcohol cars inject so damn much of the stuff.... That and the fact an ideal AFR for Ethanol is around 8:1 compared with petrol's 14.7:1.

To summarise: Use V-Power if you have one locally and can afford it, otherwise Momentum will do and is better than most other (95/97) fuels

[pudding]

@AJP I have no idea - I haven't visited rtech yet!

But yes your right it would make no sense to go back to 95 Ron. I just went on reading posts that a lot of people said you need 99 in your tank when visiting them.

But even still on my stock car I only use 99 Ron now 

I had V Power in mine when it was mapped and I've since used 95 RON without any troubles.  Mine's only stage 1 though, so not pushing things too hard.

Polar FIS with the knock regulator channels up is a good way to monitor things.

[grey golfster]

My APR map has 4 selectable maps, one of which is standard, another modded but low octane. Had this >4 years now. Pleased. The "top map" was done to V Power.
I have found this selectability useful when I have not been able to find a supply of higher octane fuel. It does still happen, but less frequently nowadays!
Mrs grey not at all amused by some extended detours that have been needed to buy "special" petrol!

Can't speak for other maps, but guess APR not alone?

[Addymk2]

Tesco 99 Ron is made up with a small portion of ethanol, which theoretically would be beneficial to a turbod lump. I like the stuff personally.

Sent from my Nexus 5X using Tapatalk

[flashp]

My APR map has 4 selectable maps, one of which is standard, another modded but low octane. Had this >4 years now. Pleased. The "top map" was done to V Power.
I have found this selectability useful when I have not been able to find a supply of higher octane fuel. It does still happen, but less frequently nowadays!
Mrs grey not at all amused by some extended detours that have been needed to buy "special" petrol!

Can't speak for other maps, but guess APR not alone?

I have a SPS switch for my Revo map which covers V-Power/99, 97 and 95 octane fuels. Like you I've not had to use it for this but it's nice to know you could if needed.

[jaylufc17]

i used shell v power for last 3-4 years however recently ive swopped to tesco 99 mainly due to price in the area but notice no difference...

from memory pretty sure top gear/fifth gear have done a comparison and concluded practically no difference

[richtung]

Popped into Costco Trafford over the weekend. Super Unleaded 99 RON was £1.15

Rich