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Lake Race Mix
This is a more powerful mix and calls for an octane boost. For stock sleds, you want approximately 98 to 100 octane gasoline. This can be reached with any of the popular octane boosters sold at most stores, such as Gold Eagle's 104+ Octane Boost. If you have a sled that already has a higher octane requirement, then you want to use the highest octane gas available.
The same basic procedure is used that was followed in making the trail mix. You need to start with a base gasoline of 98 octane or more adding 4 oz. of Extreme Power per gallon. You will then work up to 8 oz. per gallon while watching your plugs and piston wash.
With the Race Mix, piston wash is far more accurate than plugs, and you're looking for wash spots roughly the size of a nickel, a larger wash spot than you use for normal racing. At this level of added oxygen, you must start your jetting 4 to 6 sizes higher than your race setup. By the time you're done, three to eight increased sizes may be needed on the main jets.
You also want to keep an eye on your idle and midrange to make sure everything is jetted correctly. I always ran the test sled a little rich on the mains, using the stock idle and midrange jetting. Stock Mach Zs are quite rich on the pilot jets from the factory so I didn't have to change pilot jets. If you want to run wide open across a lake for a couple of miles, then jet to a dark brown plug. Like I said, I like to ride instead of wrench.
I have used 8 ounces of Extreme Power per gallon so far with excellent results. The jetting required for the lake race mix means that you can't just fill up the sled with gasoline, and trail ride with the same jetting you use with this mix. This lake race mix is for the rider who is comfortable with jetting the sled before riding or racing. At this level, you're using highly modified gasoline with some serious power boost!
Back out on the lake, with this new lake race mix, the sled really has a strong throttle response. You can really feel it pull hard. I was rewarded with a 4 mph increase in top speed on the Speedchek! It seemed that the acceleration from 0 to 60 was much stronger than 4 mph on the Speedchek seemed to indicate. A trip to the dyno would give this performance gain a number.