Cheap V-Power!

[mosc7pc2]

Not a regular poster, so forgive me if I've put this in the wrong section.

Just a heads up, Shell at Oldham Elk Mill (A627 round about) is selling V power at regular unleaded price. £1.29/l, normally £1.36/l.
Seems to be some sort of promotion but the guys there don't know how long this offer is going to last!

[Rovinghawk]

mosc7pc2 said:

forgive me if I've put this in the wrong section.

You're being helpful- no forgiveness required.

[Joeguard1990]

Can someone please explain the benefits of this fuel if your car is not specifically mapped to extract the performance gained from using higher octane fuel...?
From a performance side, not MPG.
Thanks

[trickywoo]

Joeguard1990 said:

Can someone please explain the benefits of this fuel if your car is not specifically mapped to extract the performance gained from using higher octane fuel...?
From a performance side, not MPG.
Thanks

Its the same price.

I know I always get a smoother throttle response and nicer engine note when I put it in my GSXR.

[FussyFez]

Joeguard1990 said:

Can someone please explain the benefits of this fuel if your car is not specifically mapped to extract the performance gained from using higher octane fuel...?
From a performance side, not MPG.
Thanks

I don't know the scientific benefits, but my B18 civic runs smoother with less flat spots at part throttle, vtec changeover seems more noticeable aswell.

I always run V power where possible.

[GregK2]

Joeguard1990 said:

Can someone please explain the benefits of this fuel if your car is not specifically mapped to extract the performance gained from using higher octane fuel...?
From a performance side, not MPG.
Thanks

Depends on your car's ECU's ability to sense knock and advance or retard timing / ignition to suit. Most beneficial for forced induction.

No gains to be had if your ECU can't sense it and adjust accordingly.

[Joeguard1990]

GregK2 said:

Depends on your car's ECU's ability to sense knock and advance or retard timing / ignition to suit. Most beneficial for forced induction.

No gains to be had if your ECU can't sense it and adjust accordingly.

Are there any dyno graphs / proof floating about where the same standard car running no modifications has been put on a dyno with the different fuels?
Not arguing against it's benefits, just generally interested

[kmpowell]

Joeguard1990 said:

Can someone please explain the benefits of this fuel if your car is not specifically mapped to extract the performance gained from using higher octane fuel...?
From a performance side, not MPG.
Thanks

The compression ratio of an engine determines the required octane rating. Low octane fuel can handle the least amount of compression before igniting, so when a high performance engine has a higher compression ratio it benefits from a higher octane fuel. Octane rating = burn rate. A burn rate that matches performance will give a better over performance. This is particularly relevant for forced induction engines where compression is very high, hence why you see better results of high octane fuels in Turbo cars.

It's also worth bearing in mind that hi RON fuels are not designed to increase power, they are designed to ensure your car is running at the optimal manufacturers settings. So if your car is designed for 97+ RON (which most high performance cars are) a higher RON fuel will ensure it runs to that level, not increase its power.

[GregK2]

Joeguard1990 said:

Are there any dyno graphs / proof floating about where the same standard car running no modifications has been put on a dyno with the different fuels?
Not arguing against it's benefits, just generally interested

Fifth gear did a feature or 2 on it, videos are on YouTube

[trickywoo]

kmpowell said:

The compression ratio of an engine determines the required octane rating. Low octane fuel can handle the least amount of compression before igniting, so when a high performance engine has a higher compression ratio it benefits from a higher octane fuel. Octane rating = burn rate. A burn rate that matches performance will give a better over performance. This is particularly relevant for forced induction engines where compression is very high, hence why you see better results of high octane fuels in Turbo cars.

It's also worth bearing in mind that hi RON fuels are not designed to increase power, they are designed to ensure your car is running at the optimal manufacturers settings. So if your car is designed for 97+ RON (which most high performance cars are) a higher RON fuel will ensure it runs to that level, not increase its power.

Turbo charged cars actually have a lower compression ratio (typically) than NA. Octane rate is better considered in terms of pre-ignition resistance.

[Matthen]

Little far for me to go fill up. Anyone know if this is happening elsewhere?

[Pentoman]

GregK2 said:

Joeguard1990 said:

Are there any dyno graphs / proof floating about where the same standard car running no modifications has been put on a dyno with the different fuels?
Not arguing against it's benefits, just generally interested

Fifth gear did a feature or 2 on it, videos are on YouTube

I also believe EVO did a feature on it, using the various hi-octane offerings from various suppliers.

Think they used a Mk5 GTi for the test.

It was interesting and there were definitely good differences between them.

[Motorrad]

Every petrol car I've owned that had a turbo gave better MPG using higher octane fuel. Driveability was improved as well but that's merely subjective.

[kmpowell]

trickywoo said:

kmpowell said:

The compression ratio of an engine determines the required octane rating. Low octane fuel can handle the least amount of compression before igniting, so when a high performance engine has a higher compression ratio it benefits from a higher octane fuel. Octane rating = burn rate. A burn rate that matches performance will give a better over performance. This is particularly relevant for forced induction engines where compression is very high, hence why you see better results of high octane fuels in Turbo cars.

It's also worth bearing in mind that hi RON fuels are not designed to increase power, they are designed to ensure your car is running at the optimal manufacturers settings. So if your car is designed for 97+ RON (which most high performance cars are) a higher RON fuel will ensure it runs to that level, not increase its power.

Turbo charged cars actually have a lower compression ratio (typically) than NA. Octane rate is better considered in terms of pre-ignition resistance.

My understanding was it depends how much boost is being run. If the turbo is running a lot of boost you go with lower compression ratio to avoid predetonation. Low boost and you have high compression which is what most manufacturers run to avoid turbo's going bang.

[James2593]

This offer appears to have ended, I went at 8.15pm tonight and Nitro+ was £1.38. Thanks though OP.

[Foppo]

trickywoo said:

kmpowell said:

The compression ratio of an engine determines the required octane rating. Low octane fuel can handle the least amount of compression before igniting, so when a high performance engine has a higher compression ratio it benefits from a higher octane fuel. Octane rating = burn rate. A burn rate that matches performance will give a better over performance. This is particularly relevant for forced induction engines where compression is very high, hence why you see better results of high octane fuels in Turbo cars.

It's also worth bearing in mind that hi RON fuels are not designed to increase power, they are designed to ensure your car is running at the optimal manufacturers settings. So if your car is designed for 97+ RON (which most high performance cars are) a higher RON fuel will ensure it runs to that level, not increase its power.

Turbo charged cars actually have a lower compression ratio (typically) than NA. Octane rate is better considered in terms of pre-ignition resistance.

Two different opinions as clear as mud,>

[MissChief]

My car (Seat Leon Mk1 Cupra with VAG 1.8 turbo 180hp) runs a lot smoother on VPN+ and although it's more expensive I get up to 40 miles more per tank as well. Worth it IMO.

[HannsG]

I ran my E46 M3 om 95ron this week. I'm going back to Vpower...it ran like st in 95