SI with 87 octane gas *Threads merged*

[obert]

DONT DO IT MAN !!!!!!!!!!!!!!!:wigglesmile y:

[bluetwo]

You should never put less than 91 in a Civic Si. The engine can use it because it the ECU will prevent harmful conditions. Regular or 89 octane should only be used in emergencies though.

Personally I want my engine to make it to 180 to 200K or better which isn't that unrealistic if you look at a lot of Honda engines out there. Not that it'll get grandma driven and never rev'd up but I'm going to use decent synthetic oil and use the recommended fuel.

[kenny rogers]

Actually, I was just talking to someone about higher (and therefore colder) elevations such as Colorado... I was told they actually sell less octane gas (85 instead of 87 as "regular). However, that has more to do with the altitude and not the tempurature.

Keep premium in it, you just get more horsepower out of colder air

[rmfa]

The compression of this motor requires the higher octane.

[nayilsi]

High compression ratio.....keep it 91+ always

[lovecheese]

heh... who told you this? I wanna meet them and give them the FAIL trophy.

[ryker]

High compression engines create heat. Hot enough to cause lower octane fuel to pre-ignite or ping. You can run colder spark plugs, cool down the IAT, alter timing, or run high octane fuel.

[darkrom]

Dont be dumb. 20¢ < New engine.

[bluek20z3]

had a friend of mine lolol went to a gas station and it was full servcie right.....Ask to be fulled on on 93 for his 1.8T VW (Which i take all day long intil he moded it ) Anyways make a long story short the gas dude that pumped gas in his car fulled him up with 87 lol. He got a **** load of check engine lights like 2 days later wen t to the dealer and got the gastion to pay for VW to flash his system.

[chaohliu]

Originally Posted by MILOT

Hi
i've been told that I should put regular gas in winter instead of 91+ octane, because the ratio fuel/air isnt the same because of the air temp.
whats your opinion???
thanks
08 Civic SI

I think instead of creating a new thread on a topic that is discussed many times, you should read the merged thread on lower octane in the Si.

[travis_si]

Originally Posted by MILOT

Hi
i've been told that I should put regular gas in winter instead of 91+ octane, because the ratio fuel/air isnt the same because of the air temp.
whats your opinion???
thanks
08 Civic SI

I bet an R18 owner told you this. Jelous bastard....

[huanqi]

to the op...why don't you just ask her? i dont think shes stupid enough to not know what she puts in her car...

[ClydeFG2]

No. Just keep pumping 91. How it always was, is, and will be.

[SiLvErLIgHT06]

Originally Posted by darkrom

Dont be dumb. 20¢ < New engine.

[Ma1donado]

Has anyone actually tried 87 in their si yet? I put 2 gallons in the other day because it was the only gas station around and all they had was 87 for sale...odd i know...anywho, seemed like it just cut timing well over 10 degrees and added more fuel to keep it from detonating. I took it through the rpms a few times to see what actually happens, and I didnt have any detionation or any problems of pinging either. I personally feel if your gentle to it youll be fine. Even acura states in a service news article it is okay for you to use 87 if only excessible and can use for awhile without seeing a problem other than egr clogging problems. Perhaps ill run 87 for 2 weeks and see what happens and review it every few days.

[RTA Supra]

sigh........We (Acura) get so many new cars coming in pinging their ass off due to 87 octane

[polar23]

well, there's really a huge difference when you put a lower octane on the si other than the recommended. I accidentally used an 87 octane during my roadtrip from LA-to-Denver and i felt the difference in throttle response and everything feels so laggy + the rev lag it's like you're being hold back. :SHOCKED:

[Flatulator]

Originally Posted by Ma1donado

Has anyone actually tried 87 in their si yet? I put 2 gallons in the other day because it was the only gas station around and all they had was 87 for sale...odd i know...anywho, seemed like it just cut timing well over 10 degrees and added more fuel to keep it from detonating. I took it through the rpms a few times to see what actually happens, and I didnt have any detionation or any problems of pinging either. I personally feel if your gentle to it youll be fine. Even acura states in a service news article it is okay for you to use 87 if only excessible and can use for awhile without seeing a problem other than egr clogging problems. Perhaps ill run 87 for 2 weeks and see what happens and review it every few days.

Maybe 2 weeks won't do anything long term to your engine, but why risk your investment like that for an experiment?

[2000gsr]

I wouldn't. I have had no problems using 93 and I have ran that all year around for the 4+ years that I have owned my car.

[EchoHawk7]

It really isnt that hard, you bought the si trim knowing its higher performance and spent over 20k on a civic which is unheard of for a civic to begin with. So everyone just put the better gas in your car which your owners manual recommends anyway. If your too dumb and cheap(which obviously you cant be cheap cuz you spent over 20k on a civic) to put the more expensive gas in your tank then maybe you should trade in your si for a ex, lx or maybe a focus, just close this thread.

thread closed the end.