GrantG

Usually Ethanol is the oxygenate, I think. Ethanol has less energy density than gasoline and requires a richer mixture to burn properly. It also can deteriorate the fuel system more rapidly (particularly rubber lines). But the GT3 is designed to run up to 10% Ethanol, so the small amount used to raise the 98 Octane race fuel to 100 Octane is nothing to lose sleep over. However, if given the choice I think the non-oxy 98 is preferable.

Found this: https://en.wikipedia.org/wiki/Oxygenate

FourT6and2

All CA gas has ethanol. So I don't think it will make a difference either way. The regular 91 octane pump gas is 10% ethanol lol...

GrantG

List of Ethanol-Free stations by state here:

https://www.pure-gas.org/

FourT6and2

Helpful website, but there's nothing anywhere near SF on there.

gtrguyinaz

E- 85 has 40% less power/energy than pump gas.................thus.......injectors must be able to flow 40% more fuel to run E-85.
Torco and Boostane are easy octane boosters and I have used them for 20 years........... Boostane Professional is best.............
1 oz mixed with 1 gallon of 91 pump produces about 95 octane...........

GrantG

Bummer, but I wouldn't worry about it too much (you don't sound worried )

FourT6and2

Bro, I'm sweating buckets over here lol

astolfor

If we base EC in the NIST standard of 1 gallon of 91 Octane is about 33.70 kWh~115,000 BTU or 898.4BTU per oz, then I would buy the manufacturing plant for that octane booster. Then, call NASA and tell them to stop investing in the next plasma engine, because we have the fuel of the future. The math for the EC of your octane booster would come at around 11.12kWh per once and that is better than Pu-239's EC. Pretty incredible indeed.

FourT6and2

I was gonna say something, but figured why bother lol. I looked up both of those products mentioned and they say you need about 15 ounces to raise 20 gallons of 91 octane to 93. But I'm a bit skeptical. I wonder if they're talking about octane points, rather than actually raising the true R+M/2 rating. Neither product's websites were specific. Most octane boosters actually only raise the octane points. So they'll say oh yeah boost your octane by 4 points. But that means going from 91 to 91.4...

astolfor

I will always wander at the power of ignorance...and how some people even get in a position of buying a gallon of milk..
Anyways...unsubscribing from this thread.

PierreTT

Excluding the benefit of pinging avoidance

What is the real power delta between a 91 filled car and the same car filled with 95??
Is it just "butt dyno" or somebody have real data to compare?

FourT6and2

Eh? Did I say something controversial? Hard to understand if you're referring to me or not. Whatever.

FourT6and2

From what I understand, raising the octane does not, in and of itself, increase power. The GT3 is tuned from the factory for 93. So running 95 will do absolutely zero for you. Running pure 100 will do nothing as well. But running 91 = ECU pulls timing to prevent pre-detonation = a little less power. So running higher octane or using octane boosters for people who can't get real 93 isn't about INCREASING power. It's about preventing a DECREASE. Unless you can actually tune the car for 95 or 98 or 100, it will only waste money to use it. UNLESS, you're mixing with a lower grade to bring the average up to 93. If you can get 93 at the pump, just do that.

rick500

Don't think the stuff is sold in Ca but is readily available in Arizona and probably other states. I made the mistake of adding a few gallons of 100 octane to my 997.1 during a fill up. So far no issues but word is o2 and Cat damage is a distinct possibility? So, I'm just waiting now. Have a durametric so can check status of any faults that occur...

FourT6and2

As long as you use unleaded gas without metal additives, you're ok. 100 octane is fine for your car.