I gave in

[DeepSea117]

After a Cruise/BBQ day last Saturday, I used about 11 gallons of fuel. Hearing of this 76 station in nearby (okay 25 miles away) Redwood City, I decided to make a trek down to this area I've never been to, all in the name of 100 octane fuel.

I've been really wanting to put something more than 91 octane since I got it from Minnesota filled to the brim with 93 octane. And I've been lookin for a reason to find another 100 octane-seling station since the closest one to me before I found out about this one was over 50 miles away.So...I put in over 12 gallons, and it hurt my retirement funds ($4.69 a gallon) but I sure felt better. Seeing as this place is less than 10 miles from where I work (not where I live) I was looking for suggestions on how to take advantage of this newfound boost in octane levels.

[Marauderjack]

You will probably see a loss in both performance and fuel mileage....You have to bump the timing up to take advantage of the additional octane!! :argue:

If your tune is for 91 octane....that will give you optimum results!! :beer:

If 91 octane is pinging some a little 100 octane will fix it but a tank full will simply waste your money...IMHO?? :cool:

Marauderjack :(

[SergntMac]

You have to bump the timing up to take advantage of the additional octane. If your tune is for 91 octane....that will give you optimum results. If 91 octane is pinging some a little 100 octane will fix it but a tank full will simply waste your money. Correct.

I'm of the frame of mind that quality control on octane is..."loose?" IMHO, the best use of 100+ octane is to add a few gallons to your 91 octane just for race events, or, other hard driving, and only as a measure of getting the best out of your 91 octane tune. If you have a flip chip, or HHP, you can get a 100 octane tune for racing and switch over, but without that, there is no real benefit from higher octane alone.

[Joe Walsh]

Glad to see this posted.

I am SO TIRED of listening to Ricers describe how their Jap-Turd ran like a Viper after they put 'Race' fuel in the tank.

If you don't bump the timing, chances are that 100 Octane fuel will hurt your performance.

[Cartman]

Is there a difference in adding some (a few gallons) 100 oct to 91 oct compared to one of those octane booster bottles (I saw one on TV that said "104+")?

[DeepSea117]

Correct.

I'm of the frame of mind that quality control on octane is..."loose?" IMHO, the best use of 100+ octane is to add a few gallons to your 91 octane just for race events, or, other hard driving, and only as a measure of getting the best out of your 91 octane tune. If you have a flip chip, or HHP, you can get a 100 octane tune for racing and switch over, but without that, there is no real benefit from higher octane alone.
How accessible is the chip? And will the computer on the car log the fact that a non-factory tune was used?

[Bradley G]

The chip will be detected even if it is removed.The contacts on the edge of the PCM(Power control Module)have to be cleaned from the factory coating that is applied from the factory.

The same changes can be made via a hand held tuner.
This can return the vehicle to it's factory programming with no evidence.

How accessible is the chip? And will the computer on the car log the fact that a non-factory tune was used?

[ctrcbob]

On that 100 octane pump, does it say R+M/2 or does it say Ron?

If it says Ron, or Research Method, or does not say R+M/2 it is probably equal to the 93 octane that you get from most pumps that say R+M/2. (Research Octane plus Motor Method Octane, divided by two, or the average octane of the two methods).

98 Octane Research Method is equal to about 92 R+M/2.
95 Octane Research Method is equal to about 87 R+M/2.