wicked383lt1

I did a search and wasn't able to come up with any answers. I curious to know if I put 110 octane in my car mix with 93, will that improve performance or harm it? Current mods are bolt - ons with a tune.

idle

iTrader: (5)

A higher octane-rating signifies the fuel is harder to detonate under compression. So, unless you're tuned for higher octane fuel or are running high-compression (and thus tuned for it), there's no improvement with an octane booster.

wicked383lt1

So it won't harm performance, just not do anything for it. At least it should clean my fuel system...right? I'm getting it free so it's not a big deal. I just want make sure I don't **** my car up.

idle

iTrader: (5)

Higher octane fuels are not cleaner or 'better' than lower octane unless you require higher octane fuel in high compression or boosted applications. It won't hurt it, but may decrease performance since the fuel is 'harder' to detonate.

My grandfather, for years, purchased 93 Octane fuel for his Prism (4 cylinder econobox) and I always wondered why he did that, but he was the type of guy that you didn't question his motives. Well... he wasn't necessarily a car guy and he wasted a lot of cash on that fuel.

1 FMF

iTrader: (1)

as long as it's unleaded 110 that is safe for catalytic converters then you won't hurt anything. don't expect higher octane to clean better or worse. what does any cleaning would be the detergent additives in gasoline, which has nothing to do with octane. and then how well those additives clean the back side of the intake valve or not leave deposits is unknown as far as i'm concerned, nothing out there conclusive.

wicked383lt1

I have Lts without cats. My o2's should be good...right? I'm asking a lot of questions so I can learn.

Zmg00camaross

iTrader: (11)

If it's leaded race fuel then it's a no go. Your o2s will suffer and cats if you have. If it's unleaded you probably be fine.

RPM WS6

iTrader: (3)

110 in an application that only requires 93 will in fact harm performance or at least MPG. The higher octane is more resistant to combustion (to prevent detonation), so if you don't have a need for the slower, harder burn (such as higher compression and/or more aggressive tuning as mentioned above, and/or hotter combustion temps due to FI, etc.) then you can only stand to lose overall performance with a higher, unnecessary octane.

A given engine will attain best power and MPG when the lowest possible octane is used that still 100% resists detonation (knock, pre-ignition) in said application in a same-conditions comparison.

A point or two of higher than needed octane probably won't make much difference, but if all you need for your current setup is 91-93 octane to resist all detonation, and you dump in a tank of 110, I would expect to see some amount of reduction in overall performance, including MPG.

wicked383lt1

Thanks a lot guys...that's what I love about this site!!

LQfour

More octane per mass of fuel will put more potential energy into your cylinder. Carbon and Hydrogen. Question is can you get it hot enough to burn it all and collect it? Can you collect more energy than when burning 93? maybe

wicked383lt1

I actually found out it's 104 octane.