General Speed-Running

[MetalMan]

Doing speed runs with my cars is something I have enjoyed. It first started with my Rustler on 4s 6600mah 8C Lipo and a Feigao 540 12s and then a Mamba Max 4600. Those Lipos couldn't hold their voltage very well, so speed was limited. However, the Rustler did hit 57.5mph (GPS verified). Gearing was 26/87 with HPI Geolandar tires all around.
Soon the Rustler will be running the Mamba Max 4600 system on 4s2p A123 M1 cells. This battery setup can put out quite a bit more power than the Lipos I had been using, so I'm hoping to speeds easily in excess of 60mph.

Yesterday I finished up my HPI MT2 18SS brushless conversion. It's using 4s2p A123 M1 cells (same pack that will be used in my Rustler) with a Feigao 540 8L and a mamba Max ESC. The tires are the ones that come with the 18SS kit. With 4wd, this truck is QUICK. It accelerates very fast, with a lot of control. It's geared 20/49 (38/13 at the diffs). So far, the highest speed I've hit with it is 55.7mph. That's without the body, though. I tried running it with the body since if the truck flips over it'll have some protection, but it went a fair bit slower with the body on. I think it hit something like 50.9mph, almost 5mph slower than without the body.

With both trucks, one major limiting factor has been radio range. The Rustler's range was worse than with the MT2, but the MT2 still isn't getting as much range as I would like it to. The radio is a MX-3 FM 75mhz, a Novak XXL receiver, and "genuine" Airtronics crystals.

It seems at least for 1/10 stadium trucks bodies aren't good to use if you're after speed. Anyone else ever found this?