Originally Posted by
fyrstormer
Well, I finally had a bit of a breakthrough. I swapped the medium glowplug I was using with a hot glowplug from my dedicated winter nitro truck, and suddenly my RS4 gained 3mph in repeated testing. That's roughtly equivalent to 2000rpm, according to this car's drive ratio and tire size. As if to prove the increase in speed wasn't caused by removing drag in the drivetrain, it also idled higher, so I was able to close the idle gap a little bit. Enriching the fuel mixture 1/24t dropped the top speed to 47mph; leaning it 2/24t did not increase the top speed, only the operating temperature.
What do RCTech's nitro gurus think should be my next step, based on this info?
I already told ya the single most effective thing you can do ! adding the hotter plug just backs up what I said about the engines compression being too low... previously with the cooler plug your ignition was too retarded and you were losing power, adding the hotter plug advanced timing and increased power... reducing shim and a cooler plug in the end will make the absolute best power