LehmanZ06

Just wondering if I took the car on a trip and couldn't find 93 octane and only could find 91 or 95, could I mix the 91 with 95 to make 93 ?

Would the 95 hurt the car ?

Quadcammer

To be sure, you'd have to datalog the car to see if its pulling timing (i.e. knock retard) on 93. If its not, 95 does nothing for you. If it is, you may see a small benefit.

jimbo1111

There may be a benefit to running higher octane. Newer type ECU's run open loop and will increase ignition and provide greater performance. Tuners these days are extracting a lot of hp from ethanol based fuels as well but I don't see the Porsche platforms being experimented on or supported because of the cost of engine failure may be a little overwhelming for most.

LexVan

Where are you going to find fresh 95 octane fuel that is unloaded?

Dewinator

Sounds like a nice problem to have. I'd be happy just finding some 93 in California.

Diablo Dude

For those in the SF East Bay....


https://www.yelp.com/biz/sunol-super-gasoline-sunol

STG

95 would be just fine! Even better than 91 or 93. Go for it.

OKB

I never see 95 I find 93 everywhere, especially since I use shell nitro+

simplex

Thank you!

erko1905

Actually there are a few very high hp (800+ I think) 991 turbos and turbo S's I've seen around forums/social media, so, you'd be surprised.

As far as the octane goes - I ran 100 (supposedly, claimed by the sketchiest Sunoco in NJ, it was probably 97 tops) octane on the 3.8 NA for a tank or two last year just out of curiosity, the engine did feel like it was running a tiny bit smoother -- but it might've been purely psychological. I'd say no issues w 95, but when in doubt try to avoid 91 --- the mix should be "ok" in theory I presume (people usually do mix high octane ethanol w regular gas for similar purpose, or octane booster chemicals etc)