That's a completely different technology, it's pretty cool however, allowing per cylinder control of not only spark timing but also injector timing and quantity control.
Tesco Momentum 99... yay or nay?
- Thread starter Stormster
- Start date
That's a completely different technology, it's pretty cool however, allowing per cylinder control of not only spark timing but also injector timing and quantity control.
Caporegime
Well if higher Ron fuel means less knock, then the ecu will retard timing less = more performance than lesser ron fuel with more knock.
Soldato
I was using Tesco 99 when this thread was created and still using it now.
My current car is mapped for vpower but it's fine on Tesco 99
My current car is mapped for vpower but it's fine on Tesco 99
You've forgotten the Saab 9-5, which had ion sensing knock control a good 6 years before BMW bought out the system on their v10.
Soldato
Sack immediately. 
Soldato
Soldato
Of course yes. But from my experience it works very well having a tuned one.
Saab were very innovative in the day, they did some really cool stuff which was well ahead of the times.
Saab made turbo charging mainstream but they weren't the first. That accolade goes to the 1962 GM Corvair, which is rather better known for featuring in Unsafe at any Speed.
Soldato
The issue ewith ESSO 99 at the moment is thats it's "unreliable" i.e. whether you get "good" ESSO 99 or not depends on where you are in the country.
I was chatting to my mapper Doug today specifically about it and he said he's seen a huge variation in the fuel quality. There's been folks who've arrived for mapping who've filled with their local ESSO 99 and ran perfectly and yet others who've filled with their local ESSO 99 (including using the ESSO just 500yrds from MRC) which has been as bad as 95 RON on the dyno but still not showing any ethanol content, suggesting that it really is the 99 RON stuff and not a filling mistake.
For me it's just too hit & miss right this minute where as Shell/Tesco seems to be pretty solid no matter where you are. Of course if your local ESSO is one of the "good" ones then it makes sense to use that but I'd probably be more wary of using it if I'm travelling around.
Soldato
- Joined
- 6 Jan 2012
- Posts
- 5,502
£1.63 a litre at a local Shell for normal diesel, dread to think what V power costs.
Soldato
I filled up with V Power today @1.599 a litre
I notice no difference between momentum or vpower. I notice a very marginal difference with esso super unleaded which feels better to me. I use that or momentum regularly, whichever I am closest to on the day.
However, all three are way better than 95. Had to use it for the first time in ages recently, don't know if e10 is worse as i can't remember, but feels way down on response and power.
However, all three are way better than 95. Had to use it for the first time in ages recently, don't know if e10 is worse as i can't remember, but feels way down on response and power.
Caporegime
That didn't help my 9-5 cracking it's no4 piston. Was running momentum although remapped.
Soldato
- Joined
- 6 Jan 2012
- Posts
- 5,502
Old E43 M3 was way quieter on 'posh' gas when you floored it, partularly over 6000rpm. Didn't notice any difference with E92 V8 though, apart from the appalling fuel economy 
Caporegime
Does fuel make an engine quieter?
Was it knocking hard or something?
I know oil can make a difference but not sure why 95 or 99 Ron would reduce engine noise.
Was it knocking hard or something?
I know oil can make a difference but not sure why 95 or 99 Ron would reduce engine noise.
Last edited:
Associate
I have to as my A4 is remapped. Can be a bit of a pain only having the option to use super when staying in quieter, more rural areas of the UK. Not every station stocks super around those areas.