what octane fuel to run with rb20det?

[frosted flakes]

What is the minimum octane fuel that can run on the rb20det? I am running 91 octane now and it runs fine, but what is the lowest octane i can run without knocking?

Thanks

Tony

[PROJECTRB240SX]

91+ WHATEVER YOUR PREMIUM IS. ITS NOT WORTH TEMPTING FATE ON AN OLDER TURBO MOTOR WITH ANYTHING LESS, ALTHOUGH MY CAR HAS BEEN RUNNING ON 87 FOR ALL THE TUNING.

[cyris3d]

ive run up to 10psi with the t3/t4 on 91.. any higher and i get knock

[PROJECTRB240SX]

FUEL INJECTORS UPGRADED? IF NOT THEN YEAH YOU WILL GET KNOCK, YOU NEED TO SUPPLY MORE FUEL... BTW 10PSI IS STOCK.

[spec-v5150]

I ran 92 with 2 bottles of that octane booster **** per fill up. It is more habit than anything else. Even my lowly civic gets premium fuel. Just a habit. I got myself in teh habit both mentally and monetarily before i got my RB20. I bought the highest octane always and now it is in my budget to run premium

[Joe]

why put it in a stock civic? it dosent need it just waste of money and increased buildup inside the motor from the wasted fuel

a civic HX does NOT need anything higher than 87. **** it probably runs worse on premium.

[PROJECTRB240SX]

ACTUALLY IF YOU USE CHEVRON THE DEPOSIT BUILD UP IS NOT A PROBLEM BECAUSE OF THE TECHRON "ADDATIVE" CLEANS THE SYSTEMS WHILE IT RUNS.

[spec-v5150]

why put it in a stock civic? it dosent need it just waste of money and increased buildup inside the motor from the wasted fuel

a civic HX does NOT need anything higher than 87. **** it probably runs worse on premium.

Habit...mostly as I said before. Besides why switch?? It is already budgeted and isnt hurting anything. And when I strap that turbo on, I will need to run premium....

[Joe]

you are gonna boost your HX engine? LOL do you know what vtec-e even is?

and switch because its a waste of money! why pay 5$ extra every time you fill up when you dont have to.

[Nameless EJ6]

I run my DX engine on 87. It deserves it too, that POS.

[themadscientist]

Japanese hi octane pump gas is 100 octane, the J-spec turbo engines were designed for this so I would get as high as possible and make sure the intercooler was lowering charge temperatures as much as possible. Backing the timing off a degree or two would help too.

[spec-v5150]

you are gonna boost your HX engine? LOL do you know what vtec-e even is?

and switch because its a waste of money! why pay 5$ extra every time you fill up when you dont have to.

Come on now...I am not that much of a newb. I know what VTEC-E is. I am going to boost it because only a few people have and I cant talk to them about their experience and if it is worth it. So I shall see. Besides if 89 or whatever the lowgrade is is 1.59 and premium at the most is a 1.67 on base, why not. I spend maybe a dollar more. But that isnt the point of this thread.....BACK ON TOPIC