Vtec Octane....

[alphabeatsco]

what octane rating does vtir need to be?
i was previosly using optimax, but they released a red one...unleaded 95 i think
is that enough? to meet the manufacturers requiments?

[civtir]

I think it says 95 or higher is recommended.

[strepto]

VTEC or no VTEC - has nothing to do with your need for octane. Your compression tells you that. The higher your compression, the higher octane you need to prevent knock. On a stock VTi, RON95 will be just fine.

[alphabeatsco]

doesn anyone know what's recommended from the factory on a VTIR?

[DRCVIC]

usually cars from factory are tuned to be able to be used with crappy fuel, this is due to the shit fuel thats avaliable in some countries that cars are shipped too, and people wonder why japan gets more power :P better fuel!

I've seen some cars rated as low as 90 or 91 octane!

[alphabeatsco]

yeah i know
but my car it clearly states use PREMIUM fuel only..
that is why im concerned about wat rating , it needs to be.

[strepto]

Remember that RON ratings vary from continent to continent. If the engine is USDM, it can take everything. They got the crappeist fuel in the world. Europe on the other hand, has the best fuel there is. Most Honda engines has KS's, so it will retard the timing if knock is detected.

[alphabeatsco]

okok, so what RON is expected for the VTIR? it's AUS VTIR..

[ATSE]

Ron (minimum) 95

As stated in the civic manual pg 108 "If you are unable to find premium unleaded petrol, you may substitute an unleaded regular petrol. The engine will compensate for the lower octane, but you may notice a slight decrease in power as a result."

[CeeVicK]

go for 98RON
but if you have to sacrifice.. get the 95RON
dont feed ur EM1 regular unleaded... :(

[wynode]

95 is minimum.

Thread closed!