ORIGINAL: Lewis.
I was talking 16% like this:
http://www.modelsport.co.uk/modelspo...products/29346
The manual for my Firestorm recommends 25% but it seemed a nightmare to tune on that. Kept cutting out and wouldn't start for ****. I have read loads so figure I am pretty clued up. Is it easier to tune the car when running a lower percentage of nitro?
thanks again guys
More nitro is easier to tune and adds power. If it revs slow and really smokey, its too rich. If it cuts out its too lean. The idle needle controls fuel mixture from idle to about 3/4 throttle, and the main needle (high speed) controls that last 3/4-WOT bit. Richen your low speed mixture a 1/4 turn or so and run a WOT pass or two to get the main needle set, then set your idle. Never set it the other way around.
Going from 16% nitro to 25% nitro would probably need the needles richened 1/4-1/2 turn to compensate for the extra nitro. More nitro = richer needles.