maybe this will put an end to the debate about higher octance fuels

YouTube - Facts about high octane petrol

 

Anybody with a half a brain cell will know that running higher octane fuel will result in your car developing more power

 

Unless the fuel is contaminated, of course.

 

 

good thread, i liked the vid, optimax all the way for me sube

 

top vid !

 

Disappointing Results on the Scoob, considering the Sti is supposed to be about 280bhp out of the box!!

 

Must check later when not at work!!!!

 

"The power output of an engine depends on the energy content of its fuel, and this bears no simple relationship to the octane rating. A common myth amongst petrol consumers is that adding a higher octane fuel to a vehicle's engine will increase its performance and/or lessen its fuel consumption; this is false—engines perform best when using fuel with the octane rating they were designed for and any increase in performance by using a fuel with a different octane rating is minimal or even imaginary."

Wikipedia

 

I was speaking in relation to Scoobs.

And yes I am aware that it's down to more than just the RON rating. It's also to do with the calorific value of the fuel and it's burn rate. That is why V Power performs better than Tesco 99. Even though they are both quoted as being the same RON value the Tesco petrol has quite an aggressive burn rate which is not favourable for a mapper when he's trying to dial in extra ignition to gain more power.

 

Did they reset the ECU each time a different fuel was used??

And, if you have had to use lower octane in your Scoob, do you have to reset your ECU, to get the benefit?

(In other words, can your ECU sense the different octane and readjust itself?)

Thanks.


Alan MaC

 

the sti is 280 at the crank not the wheels ! hence the power loss of 4wd diffs/gearbox etc.......

 

Yes, they did reset the ECU everytime, for convenience, otherwise it would take a few miles of driving for the ecu to adjust itself to the different type of fuel. If you're using super unleade, and then you use normal unleaded, you do not need to reset anything. The ecu will adjust itself accordingly over a few miles of driving.

 

That was with Optimax. Shell now do V-Power which is 99 Octane. In Switzerland V-Power is 100 Octane. Not sure why the "clean healthy" living Swiss should get an extra Octane!

 

Thanks GreggyG.

Kind regards

Alan MaC

 

cause of Ethanol I suspect