triumph87

ok, thanks for all the reapplies, i was just wondering, but its not worth it on my stock s2k.

thanks

FO2K

Our cars call for a minimum of 91 octane. What is the ideal octane number to run? Obviously at some point there is no benefit to increasing the octane put in the tank.

As many times as this topic has come up, I've never seen the ideal number stated, other than opinions.

ol' dood

The ideal octane rating would be the one that just barely prevents knocking/pinging under the heaviest of engine loads. What ecomes more important at this point woud be the distillation curve. The distillation curve is what allows the engine to rev freely and cleanly. The octane rating and distillation curve are mutually exclusive. That means that you don't have to select a fuel that is tied closely into both parameters. In my opionion, if you really want to test the outer limits of fuel components, try VP's MR2 or Ultimate-4. The Ultimate-4 will probably be easier on the O2 sensors. That is, price be damned! FYI, I will eventually test the MR-2 myself, probably will mix at a 2:1 ratio with pump premium and go from there.

700+s2000

Leaded gas will also destroy your 02 sensor. i have 2 o2 sensors one for race gas and one for regular. I hope that helps you.

Nick

HBtoS2K

Sorry man, but you need to retune on a lower octane gas. Using 113 and 116 race fuel on a 300WHP setup is ridiculous. If you like the smell of it and like to waste your money, then I guess it's ok.

Stock S2000's should run pump gas. No reason to use race gas, you will not benefit from it. Leaded race gas will eventually ruin the cat and O2 sensor.

ultimate lurker

Even stock S2000s can benefit from the _right_ race gas. VP MS103 and MS109 are capable of producing from 1-3% more power than 91 octane pump gas without changing the tuneup at all. With retuning, those gains can move to 2-5%. Both these fuels are unleaded and will not harm catalytics (well, at least the 103, can't recall on the 109).

Other manufacturers make similar fuels, and they are usually heavily oxygenated.

UL

p.s. - C16 is a very slow burning fuel best suited to high boost applications. There are better choices for moderate hp/boost apps.

m@dm@n

Do you need higher octane? A stock s2000 would not see much (if) a benifit of race gas. My turbocharged cars gain between 30-70 horses upping octane on similar boost.

S2000RAT

HBtoS2K, You need to ask before you tell. You don't know anything about my car.

Back to the civic forums.

Caffeinated21

I was under the impression that anything about 100 octane was leaded.

Slows2k

Not all race fuels are leaded.