To beat the nitros, drive better.

[SpEEdyBL]

From my observation the Tekin 1900 (or a 1512 1.5Y) on 4s w/ zero degrees of timing is a hair more in power than the nitro engines. On 5s it just blows them away.

IMO, it's really runtimes that are the issue especially when the mains are 20 or 30 minutes long. I was running a 20 minute main at a large outdoor track, which I was leading for the 14 minutes by more than a half lap. But when I decided to change my pack at that point, it of course dropped me to second, almost third, and it was hard to adjust to the higher voltage of the fully charged pack. It's difficult because 4s 5000 mah charged to 90% (4500 mah) gives me 19 minutes of runtime geared 14/46. One tooth lower could probably give me that extra minute but it's risky.

One may say to get a bigger pack or go up in voltage and less mah, lower kv motor etc, but I don't really want to add the weight of a higher capacity pack, or have to deal with the higher center of gravity of a pack with more cells. The 1900 on 4s has proven to be a VERY efficient setup with VERY wide gearing range.