Lahainabry

I just found out, one of our local Stations in Newport has 100 octane fuel.
Would there be any problems, computer, system issue, sensors in adding higher octane fuel?

Would it void my warranty if an issue arises form the higher octane?
I really don't know the issues if any. Any help would be appreciated.
I was just thinking the higher octane would run better, I might be wrong.

Thanks in advanced


B

chuck911

Octane ratings reflect how much compression a fuel can take before detonating or igniting, in other words resistance to knocking or pinging. Increasing octane above what's needed to prevent pre-ignition knocking doesn't harm anything, doesn't make more power, but often times does feel smoother and/or more responsive. Mainly though it just puts a really cool looking tinge on the tail pipes.

Bottom line any knocking is bad so higher octane is better than lower. If its readily available, you try it and like it (i.e. worth the extra) then run it and consider yourself lucky.

ADias

The car's ECU is optimized for 93. Higher than that is a waste. To get a 93 blend fill 4 gallons of 100 and the rest of the tank with 91. Octane calculator HERE.

Realize though that high octane gas in CA may have a lot of ethanol...

82_930

Usually 100 octane fuel is marketed as "race fuel", and it comes in two versions, leaded and not-leaded (I've seen both for sale at Sunoco stations). Make sure that it does not contain lead as it will foul your catalytic converter and o2 sensors. Also, if I'm not mistaken, 100 octane fuel will burn cooler than lower octane fuels, which may affect the operation of the catalytic converter as well.

der Geist

I just read something the other day that said using hi octane race fuel on the street was a complete waste of money. It was one of those 10 dumbest mods posts.

Quadcammer

If you don't have knock retard, higher octane fuel is pointless

KNS

If you were pulling a trailer, up hill, in Arizona, in 110 degree heat - then maybe.

Otherwise your 997 doesn't need it.

DC911S

It will only work, i.e., add hp, if the ECU is tuned for it, to advance the timing to take advantage of the higher octane. Pretty sure you can only get leaded gas at a race track, not a public gas station. 100 octane is probably unleaded if its at a regular pump, once you get up to 105 and higher....its leaded.

Quadcammer

Sunoco GT 100 is unleaded.

nwGTS

^^^This.
Waste of $$$ otherwise.

NAM VET

cost/benefit ratio, maybe offer some cylinder cooling under sustained high RPM heat. But few street driven cars spend more than a few seconds occasionally at WOT.

This past summer, ended up taking my wife's Turbo Mini out to the Nebraska Sandhills Challenge, my son drove on the 58 mile road course. Since we were going to run at sustained 120 mph, and the only gas out there was hard to find 91 octane, I took out a five gal can of 100 octane and we put it in just before the event. A modern knock sensor can make a lot of adjustments for "knock", but I just wanted to ensure safe maximal performance, maybe not fully possible with 91 octane.

all the best...

NV

Lahainabry

Thanks for the information, sounds like I don't need it.

Macster

Unless you are going to the track you don't need 100 octane gasoline.

You don't need it on the street as 93 is sufficient. If you are in CA which I believe you are then all you normally get is 91 octane. While this is not ideal it is not cost efficient to blend 100 with 91 to come up with "93".

Also, there is more to 100 octane racing gas than just its octane number. Blending 91 and 100 gasoline is like blending different oils to come up with hybrid oil blend. One almost certainly ends up something less than the sum of its parts, not more.

However, if you want to try 100 octane gasoline there should be no harm provided you are sure you are getting the lead free stuff. Put leaded racing gas in your car's tank and kiss the O2 sensors and converters goodbye.

Based on my trying 100 octane gasoline in my 2002 Boxster I can tell you I noticed no difference. And it cost me $6/gallon for that and that was years ago. God only knows what 100 octane gas costs now. I think I put in around 6 gallons of racing gas too and the tank was quite low so there was little 91 octane gas to pollute the 100 octane gas.

Unless you are just curious my advice is to save your money.

Philster

Even if you could take advantage of the 100 octane, it's not going to return anything significant for such a investment. At least intake and exhausts, which return some worthless HP, offer some sound for the buck.

Lotsa cash for a few ponies = Meh.

.

ezdriver

Like most things in P-world ... it about wanting it ... not needing it. lol