100 av fuel

[82turboruf]

Any one using 100ll av gas in their 930 turbo.
Any pro or cons?
I mix with 93 non ethenol.

[Rusty Heap]

https://rennlist.com/forums/911-turbo-930-forum/281243-930s-boost-vs-compression-ratio.html

[Fly911]

100 octane av-gas is not suited for car engines. The fuel is formulated for slow revving engines, and the flame front during the combustion process is slower than regular car gasoline. It would be OK if you are driving on 2-3000 rpm, but I guess that's not the purpose.

[GH85Carrera]

Yea, it is also a leaded gasoline. Just get racing fuel if you need high octane.

Redline on a typical Cessna 172 or 182 is 2,500 RPM.

[spuggy]

Originally Posted by 82turboruf

Any one using 100ll av gas in their 930 turbo.
Any pro or cons?
I mix with 93 non ethenol.

If you run a lambda sensor, you should be aware that leaded gas will kill it almost as fast as it'll kill a catalytic converter. Which is pretty darned fast.

None of 100 (leaded/unleaded) or 110 octane race gas made any difference I could detect at all with 8:1 and .8 bar of boost at WOT for me, Kokelyn, headers & K27/HF.

No knock at all WOT, through the gears.

My knock mitigation system was, however, reliably triggered climbing hills part throttle around 3000 RPM - with no boost anywhere in sight. On both US & RoW (slightly more aggressive) advance curve at bone stock factory timing. Which wasn't what I had expected.

When my distributor stuck fully advanced (yeh - 25 degrees at idle), the Safeguard lit up like a Christmas tree: My J&S Safeguard paid for itself last week....

Driving around with high-octane fuel left over from the track in the tank - either no or only very slight difference to amount of timing pulled to pull to stop the knocking.

I settled in the end for setting timing about 5 degrees more advanced than RoW spec (which, with SC cams, made a massive improvement to off-boost pickup/response), and then bleeding off excess timing half a degree per PSI (or something) once the inlet manifold reached atmo. And just admiring the blinky lights climbing hills that meant the Safeguard was working for a living

And then I went EFI. With a different model of Safeguard for coil-on-plug.