is it safe to run high octane on a b18? iwas wondeing because bandimere speed way has 111 octane or something high like that and i was going to fill it before i make some runs?

 

First question is what kind of modifications do you have?
Second, what B18 is it, B18b, b18c1, b18c5??

Most likely you are not going to see any benefit.

 

its gsr so b18c1 and header and intake mods... how will i not see any benefit from such high octane?? not trying to be smart *** but i would of thought you would see a noticable difference?

 

Why would you think higher octane fuel make a bit of difference in a car tuned for 91?

Only reason I have ever used higher than 91 in my GSR was because running an HPDE in 105* weather set off the knock sensor, putting the ECU in limp mode. So I added a half tank of 105 just to avoid detonation. That's all higher octane does, prevent detonation.

 

How did the knock sensor get "set off"? I thought it was constantly running to prevent detonation.

 

Constant monitoring, I believe is correct.

Trip it enough (however exactly it decides it has detected a "knock event"), and you end up in limp mode. No power, massively retarded timing, no vtec, inability to rev above 3,500 RPM (think that was right, wasn't paying exact attention to RPM on track when car was misbehaving, just trying to get back to grid), and a CEL.

Reset ECU and went back out. Same thing happened 15 minutes later.

Only code the car threw was for knock sensor. ECU reset by pulling fuse. High octane added as a safety. No issues the rest of the day.

Only speaking from experience. Not as an expert or having a full understanding.

 

Isn't the knock sensor supposed to retard timing enough to prevent detonation?
Did you hear that "tinkling" sound of knocking/detonation?

 

it will only retard timing so much, after awhile it will think something is wrong and set the CEL.

OP: there is no reason AT ALL to put race gas in your GSR

 

i have not deicided weather to get my car tuned on 95 octane or 97 octane

fuel prices will be going up this year

b18c4 gsr motor with i/h/e/im/tp, maybe ek9 cams

 

I don't remember hearing anything that would sound like a knock, but it was during an HPDE. Between the helmet, the windows down, the tire squeal, and the engine noise, I probably wouldn't have noticed it anyway even if it was audible inside the car.

A showroom stock Civic driver there that day mentioned having similar issues on hot days, and suggested adding some high octane to quickly get back out there and see if it happened again. Downtime during an HPDE is no fun...

 

Remember, you use a different octane rating than we do.

Gas pumps in North America are labeled with what is sometimes called the Anti-Knock Index, which is the average of the Research Octane Number (RON) and the Motor Octane Number (MON). In other words, (RON+MON)/2. Gas pumps in most other parts of the world are labeled with the Research Octane Number (RON), which is usually 4-5 points higher than the Anti-Knock Index.

Thus, regular gas is 87 octane in North America, 91-92 octane in Europe. In Europe, your 97 octane would be labeled 92-93 in North America (this is what is sold as premium in most of the United States), and the 95 octane you get would be labeled 90-91 in North America (what is sold as premium in the Western United States).

 

95 octane it is

 

alot of people (expecially rich kids who drive their dadds BMW here in my area) are under the impression that a higher octane fuel will make you go faster because it "burns faster" WRONG!...the higher the Octane the slower it burns...which is why if u have a change in compression ratios or having your timeing adavanced slightly you would run a higher octane to eliminate the "ping"ing or detenation....which is when the fuel in the cylinder ignites before the spark plug even sparks...

 

i agree with you, it doesn't mean the higher the octane the better if your stock, but hey some kids now and day probably know more so let them try it out and see if it works.