I run 100 oct unleaded, but the car has a program for it (2 previous cars). Running it on a regular program won't give you any benefit. If the computer isn't tuned for the fuel, it is a waste. I would like to know where you can find 100 oct for 20 cents more though! I used to have to pay a fortune for it! There was a Sunoco station that carried the 260GT unleaded at the pump, but also a Cam2 station. IIRC from a few years back I was paying around $9 a gallon. You can also buy it in cans with a decent shelf life.
VP-100 Fuel

 

I had an Stage 3 Twin Turbo Audi that had an ECU w/ several programmable options. One was 93 octane (everyday driving) 100/110 octane (race mode) and a water methanol mode. God, I miss that car.

The only differences between the programs were timing, fuel/air, and boost.

 

In all honesty I have been wondering if mixing 110 octane with 93 octane for when you are going to be towing a heavy trailer would have any effect on towing performance with these trucks?
You would be increasing the octane to around 95 so would the ECU be able to make that work or do you guys still think that would be a waste of money?
I dont mean towing a trailer load of lumber across town on the weekend, I mean a fully loaded maxed out in lbs across the state kind of towing.
What do you guys think?

 

You could probably see what the timing advance is with a obd2 scanner. I wonder if ultra gauge can show that data? If so, then you could run a tank of 93 and a tank of "95" and see if it advances more.

 

In most cases, the ECU has a baseline strategy that it tries to use whenever possible. In the event of engine pinging at this baseline, the strategy is modified from baseline (usually timing retardation) until pinging ceases. This also results in reduced performance.

The converse is not true, however. The ECU will not adjust it's strategy until it sees pinging and then back down, it will just continue to run at baseline. For this reason, running a higher octane than recommended will not in fact cause any increase in performance, because the ECU is not adjusting itself for the higher octane.

 

Toluene - Run it 50/50 in my triumph -

 

I had the same car. Stage III as well. Did you forget the all important valet mode too? Lol...that was important. Same on my GTi too! I love the 2.7T a d many friends still have them. I went to the 4.2 after that, but still think about picking one up when I see one!

 

Indeed.

I love having a twin-turbo 6-speed manual that also fullfills all the requirements of its "family sedan" heritage

 

re: Toluene

That can smell too good..... you always wonder what the guys in the paint shop are up to....

 

Makes total sense, thank you.