Lowered the bodies on the stage 1b & 1c cars
and added stacked FETs on the forward side of the H-bridge.
Since the 1c car with the bypass mod was noticeably faster I went ahead and added the bypass mod converting the 1b car to a second 1c.
Stage 1c six steps to a 12Km/h* SE.
Start with a stock Shelby - 4Km/h
1. Add a 34K NX Motor - 6Km/h
2. A red gear set - 7Km/h
3. Then FETs - 8Km/h (IRLML 2502 N-Ch & 6401 P-Ch)
4. Stack the forward P & N channel FETs - 9Km/h
5. Forward bypass mod - 10Km/h
6. Finally a LiPo - 12Km/h
* Note, these speeds where measured by holding the car on a Tamiya Speed checker, although great for measuring improvement the accuracy is somewhat suspect.
By using the bypass mod on, and stacking only the forward side of the H-bridge reverse is held down to approx. 8Km/h which is still plenty fast but much more usable, in fact it probably wouldn’t hurt to only mod the forward half of the H-bridge leaving the reverse completely stock.
Jdbugman
here's a link to my ZipZaps gallery it has a couple of fully proportional LiPo ZZMTs including the start of a tutorial.