Can I just go get some racing fuel and add it to the 91 octane for a bit better performance? I was told that it helps to keep the car from detonating.....and the indy took a drive with me and said that he could hear a very slight detonation at WOT. I tried to listen and couldn't hear anything except a really great engine sound....but his suggestion was to get some racing fuel and add a gallon or two to the tank. How many gallons of racing fuel...and how many octane should the racing fuel be...how many gallons does someone add to a tank to bring it up to a better octane rating?
The basic issue seems to be one of AFr's at WOT.....he said they measured it and it ran great except for one little spot at WOT...then it only pinged one or two times. How dangerous or ultimately harmful is a periodic "ping"? My hearing is not that good so I can't hear the damn thing ping. Other than that, the car is stock and runs great...the PO shimmed the wastegate to .85 bar.
1987 factory Slantnosed 930 Cabriolet/Guard's red
2002 Midnight Blue 996TT X50
1999 Iris Blue 996 (Dash fire burned and totalled 9/07)