power!
If you are not to fussed about engine life. best option from my experience is run a higher concentrated % of nitro methane. e.g 25% is for 21 - 28 engines. not sure what your is? usually smaller engines run 16%. try a higher percentage is my bet.
also what fuel are you putting through it.
byron is a nice blend for race engines, you may see better top end speed.
model technics - cheapest out of the lot but is good on a good tune, although using this fuel requires a slight tune every time started.
the last fuel i ran on my 21 8 port 3.55 cc engine was opti fuel(HPI and optifuel blend)
was very good in the hobao.
regards.
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