Which Fuel??

[Deeks]

"have seen anohter article, (but cant remember where) in which it includes Vpower. That article had V power as the winner, tesco second, bp third"

Interesting....... who was it by ?
Fuels are being developed so quickly - I wouldn't be surprised if that was the case. You got a link to the article ?

(ps. how do you insert a quote? I can't find the button !! )

 

[LiCkWiD]

The research into the fuels by Thorney Motorsport had water though. They could reproduce the results upon command, something that is crucial. In addition to this, they provided a control subject and subjected the vehicles to strict output analysis.

Unless another independant tester wanted to prove V-Powers dominance and stuck to the same stringent criteria as Thorney, I'd be reluctant to switch fuels.

Tesco is doing me proud so far..

Would certainly be interesting to see the actual article stating V-Power as to-dog.

 

[LiCkWiD]

"have seen anohter article, (but cant remember where) in which it includes Vpower. That article had V power as the winner, tesco second, bp third"

Interesting....... who was it by ?
Fuels are being developed so quickly - I wouldn't be surprised if that was the case. You got a link to the article ?

(ps. how do you insert a quote? I can't find the button !! )

The quote button is to the lower-right of the writing pane.

Or, you can insert the lines [ quote ] and then [ /quote ] to finish the quotation. Before it'll work, you need to remove the spaces between the [ and the words though, I've had to put them in to prevent

this

from happening :s

Got it?

 

[jon1]

Cupra Ross......Just to clarify, after a google search Roz is the German term/equivelant for Ron. I have no idea if the numbers equal the same though? Pretty strange why they dont just put 95 ron though instead of roz. Doesn't make sense to use 2 differing units of measurement.

Sorry a bit off topic but Iv'e always wondered the same with regards to BHP and PS

PS (Pferdestarke) being the literal german translation form Horse Power, yet they are normally 2 or 3 units out when quoted in tech spec

ie 200hp/197hp

Anyone know why?

 

[Mitchy]

They are different measuring units and are not the same.

Its 200Ps not 200bhp.

They are very very close though and yes your right 200ps =197bhp. The LCR 225 for example is measured in PS, not bhp. (222bhp)

 

[jon1]

They are different measuring units and are not the same.

Its 200Ps not 200bhp.

They are very very close though and yes your right 200ps =197bhp. The LCR 225 for example is measured in PS, not bhp. (222bhp)

strange considering pferdstarke literally translates into horse power

thanks

 

[Mitchy]

Nope but its very close.

1.015ps = 1bhp

100ps =98.5bhp

 

[cuprablue]

Ok lets put this one to bed.

The octane rating required by and engine is primarily a function of the Compression Ratio (although timing advance will also have an effect).

The performance of the vehicle in question or the amount of power the engine makes is totally irrelevant except where those things are determined by the compression ratio of the engine.

ALL Leons have compression ratios of 9.5:1 which in the grand scheme of things is not very high. Because of this they will safely run on either 95 or 98 RON petrol.

To put it in to perspective, your average production sports bike has an engine with a compression ratio of between 12:1 and 13:1 and they will all safely work on 95 RON and it states as much in the manuals. Motorbike engines are far more highly tuned than ANY car engine and so if they can run on 95 RON then so can a car (even most Supercars for that matter).

With regard to the bit in the manual that Mitchy quoted. All that is saying is that running the engine on too low an octane rating is dangerous, it does not specifically (or implicitly) state that 95 RON is too low.

The sentence in question being "the octane rating of the available petrol is lower than required by the engine". This does not mean that 95 is too low, it is simply stating an obvious fact ie if you run an engine on fuel that is of lower octane rating than the engine was designed to use you will eventually suffer engine damage. It's not specifying what exactly is too low and it certainly isn't saying that 95 RON is too low.

Also Octane rating has nothing to do with fuel mixture. Changing the octane rating of the fuel used does not cause lean or rich running. Leanness/richness is a determination of the ratio of air to fuel on a mass basis.


For more info see links below:

http://www.faqs.org/faqs/autos/gasoline-faq/part3/section-1.html
http://www.ibmwr.org/otech/octane.html

http://www.leeric.lsu.edu/bgbb/7/ecep/trans/b/b.htm
http://auto.howstuffworks.com/question90.htm

cuprablue

 

[andycupra]

The research into the fuels by Thorney Motorsport had water though. They could reproduce the results upon command, something that is crucial. In addition to this, they provided a control subject and subjected the vehicles to strict output analysis.

Unless another independant tester wanted to prove V-Powers dominance and stuck to the same stringent criteria as Thorney, I'd be reluctant to switch fuels.

Tesco is doing me proud so far..

Would certainly be interesting to see the actual article stating V-Power as to-dog.

oh i agree, im not knocking the testing. im simply pointing out that this test did not have V power in it.
it had optimax and as such was 98 ron not 99.
It even states this in the write up, although it also states that early signs are that there isnt much of a difference between optimax and V power...

 

[sebasti0n]

well I obviously fall into the Numpty class as this thread totaly confused me....

when I picked up my LC was told to use normal unleaded.....

So am I right in assuming that normal unleaded is 95ron..???

and super unleaded is 98 ron ???

 

[andycupra]

basically, there are lots of people that say you cant use 95 ron as the information supplied is confusing.

you CAN use 95 ron ok safely the ecu adapts to the fuel used.
However dont use anything lowere than 95 ron. (you shouldnt be effected in the uk)
however, there does appear to be some benefit to using super, ie 97 98 99 ron. both in better running and a few more miles to a tank. many swear by more miles, typicaly 20-30.

therefore, many will argue that approx £2-3 more for super will pay for itself over a tankful due to better mileage.

 

[sebasti0n]

I seem to remember a mate buying a new Subaru Impretza, filled it up with OPTIMAX, and the engine went all lumpy on him... he took it back to the dealership, and they had to drain out the OPTIMAX, and put in a different fuel...
I think the scooby had to have its timing changed depending what fuel your going to run.... any issues like this with the Cupra ???

 

[Jonny_Paul]

Ok lets put this one to bed.

The octane rating required by and engine is primarily a function of the Compression Ratio (although timing advance will also have an effect).

The performance of the vehicle in question or the amount of power the engine makes is totally irrelevant except where those things are determined by the compression ratio of the engine.

ALL Leons have compression ratios of 9.5:1 which in the grand scheme of things is not very high. Because of this they will safely run on either 95 or 98 RON petrol.

To put it in to perspective, your average production sports bike has an engine with a compression ratio of between 12:1 and 13:1 and they will all safely work on 95 RON and it states as much in the manuals. Motorbike engines are far more highly tuned than ANY car engine and so if they can run on 95 RON then so can a car (even most Supercars for that matter).

With regard to the bit in the manual that Mitchy quoted. All that is saying is that running the engine on too low an octane rating is dangerous, it does not specifically (or implicitly) state that 95 RON is too low.

The sentence in question being "the octane rating of the available petrol is lower than required by the engine". This does not mean that 95 is too low, it is simply stating an obvious fact ie if you run an engine on fuel that is of lower octane rating than the engine was designed to use you will eventually suffer engine damage. It's not specifying what exactly is too low and it certainly isn't saying that 95 RON is too low.

Also Octane rating has nothing to do with fuel mixture. Changing the octane rating of the fuel used does not cause lean or rich running. Leanness/richness is a determination of the ratio of air to fuel on a mass basis.


For more info see links below:

http://www.faqs.org/faqs/autos/gasoline-faq/part3/section-1.html
http://www.ibmwr.org/otech/octane.html

http://www.leeric.lsu.edu/bgbb/7/ecep/trans/b/b.htm
http://auto.howstuffworks.com/question90.htm

cuprablue

I like him!

 

[andycupra]

I seem to remember a mate buying a new Subaru Impretza, filled it up with OPTIMAX, and the engine went all lumpy on him... he took it back to the dealership, and they had to drain out the OPTIMAX, and put in a different fuel...
I think the scooby had to have its timing changed depending what fuel your going to run.... any issues like this with the Cupra ???

no there isnt this issue with the cupra.

friends subaru once had 95 put in and it went into safe mode and needed dealer to reset it.

the cupra adapts.

 

[Lee M]

Did I spoon up then????

Brough my car on 4k (Ex-Demo) and run it for about 2 - 3k using 95ron...............just down to be being a dinlow. Had a go with optimax and never looked back


In my short period of of using 95ron would I have caused damage?


Now always use vpower or tesco 99 (which seems to return worse MPG).

Cheers

Lee

 

[keaney]

Just to chip in,ive always used optimax but then when tesco brought along the 99oct ive started to use that. To be honset power wise i carnt feel a difference,as with the mpg its almost the same tank after tank,the optimax seems to make the engine sound less grutty when you nail it but thats about it. The biggest difference is £,opti £50ish a tank,tesco £42ish? When your doing 2 to 3 tanks a week you really do start to see the savings.

 

[Davidp]

Brough my car on 4k (Ex-Demo) and run it for about 2 - 3k using 95ron...............just down to be being a dinlow. Had a go with optimax and never looked back

In my short period of of using 95ron would I have caused damage?

Cheers

Lee

If its any help, I ran my leon petrol cupra on cheapo supermarket 95 ron petrol. and covered 60k miles in four years. Never had any problems with the engine whatsover, sweet as a bird.
Spirited driving on mixed roads, averaging around 28mpg.
On the odd occasion when I did use 98 ron I think i discerned a slight increase in acceleration though hard to tell with any certainty.

I'm such a tight a*se got myself a diesel now.

Cheers

 

[tomspikings]

Get your hand in your pocket and buy SHELL V-Power which is 99RON and i only put that in my Leon Cupra, these cars are high performance sports machines so treat them like it1!!

 

[RobM]

Get your hand in your pocket and buy SHELL V-Power which is 99RON and i only put that in my Leon Cupra, these cars are high performance sports machines so treat them like it1!!

Have you read through this thread properly? Well worth it

 

[Lee M]

If its any help, I ran my leon petrol cupra on cheapo supermarket 95 ron petrol. and covered 60k miles in four years. Never had any problems with the engine whatsover, sweet as a bird.
Spirited driving on mixed roads, averaging around 28mpg.
On the odd occasion when I did use 98 ron I think i discerned a slight increase in acceleration though hard to tell with any certainty.

I'm such a tight a*se got myself a diesel now.

Cheers

Thanks for the answer mate...................don't feel half as bad now!!!