The first day of testing we have been on a loam track where it rained the night before and we had a good overcast and tons of traction during the am.
The second day we have been on a very dry natural soil track with near to none traction at all but a with a layout that forces one to heavily pull the trigger. So on both tracks I have been quite trigger happy to start with.
Plugs has been O.S. P4 on both days, humidity was quite high on the first day and almost absend on the second day. Clutch was a fresh Xray 3-shoe aluminum clutch on both days with a standard 808 flywheel. Tires and rims have been Proline Crime Fighter M3 with blue closed cell inserts on V2 rims on both days to keep the comparison alive. All test-drivers used the same fuel (
www.gt-racing.de we used GT-R Offroad 25%), an AE3-based fuel and I tend to say the best money can buy in our region. It is a small company not aiming for most profit but to make a fuel containing the best ingredients they can buy and therefore have happy customers. I think that the fuel even gained some more runtime than what I would have gotten with some standard castor-oil fuel.
On both days I did not manage to enter the 9 minute time window. As for the location: Testing has been done in Bavaria, Germany. Maybe our altitude takes part in runtime differences. We have been taking the Arrows test quite seriously and watched out for comparable situations. The first test-driver, who is way more experienced than I am and not half as trigger-happy, also managed to run around 8:45 mins. Only the last test-driver who tested with a 6 mm venturi nearly hit the 10 minute marker. So maybe!, if you take EPA to 80%, lean it a bit more that you would with full throttle possible and get in a good flow with your American stlyed tracks, there might be a 10 minute stint planable.
The first test driver, who also reads here, said today, that in the US longer runtimes are mostly common due to your great track layouts which dont force you to abruptly break and accelerate again all the time. I personally can still not see 12-13 mins but maybe, if all plays out well, 10 minutes are doable on a regular basis.