What Octane???
 

Hoping to get a Discussion on this. Maybe get some of the turbo manufactuerers involved here as well. What octane do/should you run for these kits. Does 91 cut it? Is 94 with ethanol a bad idea/good idea?

As for me I am currently running 94 Octane with ethanol. But have heard bad things about it. It is supposed to run better but I do not know how true any of this is.

Love to hear what you guys think. Thanks!

Well... I am fortunate to be able to purchase 93, so that's what I use. I don't see anything wrong with using 91 though.. But what do you mean by 94 with ethanol -- You're able to purchase 94 at a gas station and it has a percentage of ethanol? Or... adding ethanol yourself like you would a meth kit...? I hope you don't mean e85.

Use what you were tuned on.

Agreed. My car was tuned on 93. So thats what I use. I haven't tried a lower octane but from what I understand the car won't respond the same way. So personally I'm gonna stick with 93.

I use 93 all gas in de has a percentage of ethanol

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Guys... from what I am understanding, I don't think he has access to 93.. only 91. Either way, I agree with using what you're tuned on. 91 will be perfectly fine...

just search, this is one of the most debated questions

many threads on SL talking about this and every other car forum

my choice is 93 btw

The gas you will want to be tuned on, is most readily available and you plan on running all the time within your budget.

If that's E85, then so be it.

If that's 91, then so be it.

If that's 93, then so be it.

Sadly I am not tuned yet. I've been to 3 different tuners in the city and all of thier obd2 readers will not access the cars fuel trim etc. 94 is available here from the pump through husky gas stations and is blended with ethanol already. 94 is easy to find here 93 not so much.

Thank you all for your input

then 94 it is ;)

I agree with using what your car was tuned with. It certainly could only be better or neglible if you were tuned on 91 but use 93 or even 100 unleaded after. Stock ECM even with Piggybacks at WOT or whatever accessed tables (partial throttle, closed loop) might yield slight increase in power after timing and fuel trims adjust but tuned on 91 and using 100 octane or even leaded C16 would do that; NOT tuned 91 and using 93.

Forgot, if your car is made to run on gasoline, it won't run right with ethanol. Some cars can run a 10% mix of ethanol in gasoline like the tC, but it's not safe to run e85, e95, etc. unless your car is setup to run e85 etc. by a certified person.

You want to run as low of an octane as you can with out predetonation/pinging (the fuel/air mix igniting before your spark plug fires). Agreed with run on what you are tuned on, but also make sure your set-up is optimized for all the components.

Ounce per ounce 87 oct has more power in it than 93. Octane is essentially the 'resistance' to pre-ignition, also the higher the octane the slower the burn of the fuel, so as for 90% of stock vehicles 87 is going to be the best bet, there are the idiots that will waste money and run a higher octane than required for their application. The higher the octane/price does not mean 'better' fuel.

As always, especially when modding, only use a trusted gas station, and never fill up when the gas truck is making a delivery, or right after it rains, the more you mod the chance of something going wrong increases.

I hope this helps....