New tesco petrol

[Ratten]

Does anyone know anything about htis new super 99 RON tesco petrol? Will it give any benefit (apart from making tesco more money) or will it just shag the engine?

I know the BP ultimate diesel is good (yes, yes, i know - but i've got a landrover as well) but no idea about this juice.

[dieseljohn]

What's your car? A modern ecu will be able to adapt the spark timing to take advantage of the higher octane rating. For an older car it will make no difference.

Be aware the octane aside supermarket fuel does not have the same addative package (detergents mainly) that say Optimax does. You pays yer money you takes yer choice.

>> Edited by dieseljohn on Wednesday 28th September 11:08

[Ratten]

Thanks for that. 4.5 cerb.

maybe just stick to Shell and their full del monte.

[vixpy1]

Its great stuff..

I use it all the time

[Viper]

I was recently talking to Craig who runs VMAX and worked for an oil company, he reckoned the Tesco fuel was better than Optimax peformance wise and was the way forward, I'll be trying it when I find a store that has it

Apprantly 'Tesco fuel' is supplied by Esso






>> Edited by Viper on Wednesday 28th September 12:05

[angrys3owner]

The Camberley Tesco sells it and I think there was a list of the stores that sell it on another thread a while ago, I didn't notice any difference to Optimax on my car.

[Number 7]

According to the Saturday Telegraph, its "blended with 5% bio-ethanol" whatever that is. Any chemists out there?

7.

[dieseljohn]

Number 7 said:

According to the Saturday Telegraph, its "blended with 5% bio-ethanol" whatever that is. Any chemists out there? 7.

Not a chemist but bio-ethanol is renewable petrol subsitiute made form a variety of things. Sugar cane I think mainly?

All forecourt petrol must contain a small amount by law (which is set to increase) but 5% is quite a lot.

Will have no perceptable effect on engine performance I shouldn't think.

[_DeeJay_]

Viper said:

I was recently talking to Craig who runs VMAX and worked for an oil company, he reckoned the Tesco fuel was better than Optimax peformance wise and was the way forward, I'll be trying it when I find a store that has it Apprantly 'Tesco fuel' is supplied by Esso >> Edited by Viper on Wednesday 28th September 12:05

Interesting...my car pinks on anything except Esso Super-Unleaded (it's got a brand name but I can't remember it). So, on the drive to Coventry to get the mapping sorted, I'll use Tesco petrol

[tuscan_thunder]

dieseljohn said:

Number 7 said: According to the Saturday Telegraph, its "blended with 5% bio-ethanol" whatever that is. Any chemists out there? 7. Not a chemist but bio-ethanol is renewable petrol subsitiute made form a variety of things. Sugar cane I think mainly? All forecourt petrol must contain a small amount by law (which is set to increase) but 5% is quite a lot. Will have no perceptable effect on engine performance I shouldn't think.

very close - sugar beet.

it will probably help engine performance on an engine which can take account of it (ie, adaptive ecu)

[dieseljohn]

tuscan_thunder said:

dieseljohn said: Number 7 said: According to the Saturday Telegraph, its "blended with 5% bio-ethanol" whatever that is. Any chemists out there? 7. Not a chemist but bio-ethanol is renewable petrol subsitiute made form a variety of things. Sugar cane I think mainly? All forecourt petrol must contain a small amount by law (which is set to increase) but 5% is quite a lot. Will have no perceptable effect on engine performance I shouldn't think. very close - sugar beet. it will probably help engine performance on an engine which can take account of it (ie, adaptive ecu)

Account for it in what way? I'm guessing it lowers RON (being that ethanol is not octane) so that you would have to boost it back up with adatives. I suppose it might change the stoichiometric ratio slightly which the lambda control should account for.

Sorry, you've got me interested now!

[groomi]

So if these fuels have a percentage of 'renewable' ingedients, then should that affect the tax levied on the fuel?

If we currently have fuels with 5% renewable ingredients, then that increases to 10%, 20%... Just a thought.

[Ratten]

so will it increase the sh*t to shovel ratio of a cerb?

[tuscan_thunder]

dieseljohn said:

tuscan_thunder said: dieseljohn said: Number 7 said: According to the Saturday Telegraph, its "blended with 5% bio-ethanol" whatever that is. Any chemists out there? 7. Not a chemist but bio-ethanol is renewable petrol subsitiute made form a variety of things. Sugar cane I think mainly? All forecourt petrol must contain a small amount by law (which is set to increase) but 5% is quite a lot. Will have no perceptable effect on engine performance I shouldn't think. very close - sugar beet. it will probably help engine performance on an engine which can take account of it (ie, adaptive ecu) Account for it in what way? I'm guessing it lowers RON (being that ethanol is not octane) so that you would have to boost it back up with adatives. I suppose it might change the stoichiometric ratio slightly which the lambda control should account for. Sorry, you've got me interested now!

I think (emphasis on 'think'!), because it is more like alcohol and is less prone to detonation, it will allow more advanced ignition. Brazil uses a lot of alcohol for fuel and I'm sure its the equivalent of 100ron petrol.

I read up about it a while ago and there was a bit feature in Farmers Weekly I think but I've forgotten exactly the details. I'll see if I can dig it out later on

[dieseljohn]

Does a cerb have knock controlled ignition timing? Anyone?

[snorky]

Round here ( North Lincs ) we supply Tescos.....( we are NOT Esso )

I should run a competition to see if you can guess who supplies the local BP , Esso , Shell, Tesco ,ASDA stations....bet it's not who you think it is...

[Ratten]

don't you have different volatility for the petrol in summer and winter as well so we don't go round blowing ourselves up in the summer? or is that just a rumour....

[dieseljohn]

tuscan_thunder said:

I think (emphasis on 'think'!), because it is more like alcohol and is less prone to detonation, it will allow more advanced ignition. Brazil uses a lot of alcohol for fuel and I'm sure its the equivalent of 100ron petrol. I read up about it a while ago and there was a bit feature in Farmers Weekly I think but I've forgotten exactly the details. I'll see if I can dig it out later on

Ethanol is alcohol.

Just has a quick search and I found an SAE paper that say that for a given RON rating a fuel with a higher ethanol content will have better anti-knock properties.

So there you go.

I would still worry a little about whether the detergents are any good but it may well be (slightly) better for performance than Optimax or whatever.

[tuscan_thunder]

dieseljohn said:

tuscan_thunder said: I think (emphasis on 'think'!), because it is more like alcohol and is less prone to detonation, it will allow more advanced ignition. Brazil uses a lot of alcohol for fuel and I'm sure its the equivalent of 100ron petrol. I read up about it a while ago and there was a bit feature in Farmers Weekly I think but I've forgotten exactly the details. I'll see if I can dig it out later on Ethanol is alcohol. Just has a quick search and I found an SAE paper that say that for a given RON rating a fuel with a higher ethanol content will have better anti-knock properties. So there you go. I would still worry a little about whether the detergents are any good but it may well be (slightly) better for performance than Optimax or whatever.

sounds safe enough to me - I'd be happy to use it.

[Jay GTi]

snorky said:

Round here ( North Lincs ) we supply Tescos.....( we are NOT Esso ) I should run a competition to see if you can guess who supplies the local BP , Esso , Shell, Tesco ,ASDA stations....bet it's not who you think it is...

Texaco?