Renegade

iTrader: (1)

I was filling my car up while distracted by a couple friends... and about 12 bucks into pumping one of my friends says "You run 87 Octane In That?"... Ah crap, I always run Premium 93 Octane in my car and it works fine, with a few bolt ons and all that.

I added some Mag1 octane booster right away but it was after the fill up so I'm not sure how effective it will be. Should I drain the gas somehow or just stick with whats in it now and make sure it doesn't happen again? If I'm taking a risk of any problems I would like to drain it, the last thing I want is a knock in my engine. What do you guys think? I've heard it doesn't matter and I've heard horror stories :-(.

Mattybz28

I'm pretty sure you'll be fine. I'd at least try to not go WOT.

1970judge

iTrader: (12)

i run 87 no probs

lunati397

put some octane booster in and you will be fine or jsut stay aways form the high rpms and WOt like Matty said

BizZzatch350

iTrader: (33)

Just drive it, be fine

z28boysteve

iTrader: (9)

like he said, just burn that gas up, if it knocks, ease off a bit, but nothing will break.

01WS6/tamu

iTrader: (37)

The general built it to run on 87.

HBHRacing

don't bother with ocatne booster. You went from running 87 octane to running 87.1 octane. Your just pissing money away. Top off the tank with 93. That will delute you a good bit. Once your halfway through that fill it up again. You should be fine. Knock retard will take care of any issues that you might have. Just keep the motor cool and keep off the gas.

Renegade

iTrader: (1)

Thanks guys, I was freaking out there for ahwhile... I will just be easier on her until I can burn this gas up and continue running 93 Octane :-).

GR33N GoblinM6

iTrader: (14)

anyone ever seen what that Octane booster does to your plugs, valves and pistons?
i used to have a picture(i'll try and find it) of an engine taken apart.. the owner used 1 bottle of octane booster a month for 6 months for racing..

pistons and plugs(valves too) had this orangey,brown crap residue all over them.

just so you know.. you can mix octanes to produce a different octane level. What makes you always use 93? are you turbo or supercharged? PCM upgrade? i would think 93 would be overkill on a stock engine with a few bolt ons..

JKDZ28

iTrader: (14)

93 octane is a cleaner fuel, helps reduce knock, better fuel economy....

why NOT run 93?

urbanhunter44

iTrader: (1)

Yeah, just burn off that 87 and refill, you'll be fine.

I've ran 87 once in my car, and it pinged, scared the hell out of me so I filled it up with 91 immediately. No problems!

I don't think 93 hurts it anyway, except his pocket book. He could get away with running 91 with no problems on a stock motor though.

METALBEAST

iTrader: (1)

No problem. Remember we DO have the advantage of having reverse cooling as an added preventer of detonation

OldSchoolSS

The PCM senses driving style and conditions and adjusts accordingly. If you run a higher octane gas for a while it will be set the timing slightly more advanced from the higher octane requirement. If you switch over to 87 and get on it right away the pcm has to learn about the lower octane gas. So it might ping depending on the quality of the gas. We have good gas by me in Wisconsin and all I use is 87 Octane. No problems and no abnormal knock readings. I have freescan hooked up to my laptop. In fact the best gas to use is the lowest octane your engine can take. More Octane = harder to spark. There is a guy that i know that runs a iron sbc 12.5:1 static compression street/strip with 87 octane around here and he has 50k miles on it with no problems.

The Big Show

iTrader: (2)

The PCM doesn't sense what kind of gas you have in there. What it senses is the knock and adjust accordingly. It doesn't care what kind of gas you have in there...if the knock sensor is "tripped" then the magic happens.

HBHRacing

Exactly. you could throw 17 octane or 19037 octane in it and the PCM will not tell the difference. like any fuel the adaptives and knock prevention devices will make changes. If you get know the PCM will retard timing no matter teh octane. If you get an uncomplete burn the adaptives will lean the mixture etc etc. Octane has no direct reaction on the PCM

OldSchoolSS

I never said that it senses the octane I said it senses driving conditions. Knock would be a condition most related to octane. So when the octane changes the knock the pcm adjusts the timing accordingly.

BichizleMyNizle

hmmm... u guys think that could be my problem of WOT and its cuttin off spark... it wont go past 2500 or so rpms and hesitates only at WOT and it gets alot more sensitive as the car warms up... i will list everything new... all spark plugs/wires/opti-spark GM OE/water pump/o2 sensors/no cats... 95 lt1 M6... u think previous owner just ran the car on 87 so much it doesnt like the 93? or babied the car and its adjusted to his driving....??? if so how do i fix

OldSchoolSS

I would try to find somebody local with a data scanner so they can look at what the computer is doing. You can also reset the pcm so it will relearn a new driving style/conditions.

BichizleMyNizle

how do i reset the PCM??? just unplug the battery?