Optimax/BP Ultimate

[RossyT]

Hi do the above petrols have any effect on the performance of a car, can the octance content really make a difference if so how. Does anyone know which is best if either at all.

 

[Rich-D]

Not really gonna do much in a 1.2 matey...

 

[edde]

You wont notice the difference unleess your engin can take advantage of it ie the 172 one can I think but the 1.2 cannot.

Optimax or ultimate are the same sort of thing there higher RON fuel all it means is the burn is more controlled in the piston to the spark plug can light earlier as the ECU knows exactly when the fuel is going to react with lower RON fuel the burns more uncontrolable so the ECU is less able to time its spark so ignites the ule later on in the compression to ensure the mix doesnt start expanding when the piston is on the way up.

That what my belief is on the matter anyway.

EDD

 

[crono33]

i doubt any engine can take advantage of the (alleged) higher RON unless ignition maps are modified

ECUs cannot yet manage the ignition timing. there is a knock sensor but AFAIK it is just a safety feaature

 

[markh72]

Was speaking to a mate about this today, he always uses a higher rating RON with optimax, he has a honda !!, hes warned me, that if i use it, the car may chug for the first few tank loads, going from 95 - 97/98 RON, but it would do the engine alot more good as its cleaner or something, hope this helps. ( i have a 1.2 extreme myself, and gonna try the 97 RON next time round)

 

[RossyT]

cheers for the help i think ill give it a go, at least ill be able to see if its just gonna be a waste of money. Is there a diffence between super unleaded and optimax etc.

 

[clio__chris]

i find optimax makes the engine slightly smoother and quieter....... no real difference in performance

 

[Eddd]

Read up on octane here:

http://www.grapeaperacing.com/GrapeApeRacing/tech/fueloctane.cfmhttp://www.grapeaperacing.com/GrapeApeRacing/tech/fueloctane.cfm

 

[McBunny]

evian/harrogate spring f**k all difference buy what ever you want lol

 

[BRUN]

even if you wont get better performance from it, its still worth using Optimax/Ultimate......simply because used for a prolonged time they clean the inside of your engine.............very well from the pics they had in EVO a few months back

also Optimax always seemed to last a bit longer to me, dunno why

not used anythin but that in the GTT engine....

 

[BenR]

optimax cleans so well due to all the detergents they add, which also affects the RON rating (resistance to knock)....not exactly the performance fuel its made out to be.