How does the HPI 2 speed work?

[nuggetz]

Last time I ran my nitro shortly after installing the 2 speed, I couldn't tell whether or not it was shifting. Is there a video or something explaining how this thing operates? Noob question I know, but I wanna learn.

 

[HeartBreak]

Mechanically: there is an arm on a disc that swings out as the rpms climb. When the rpms' hit the right range, it swings out and grabs a pin, which engages the second gear.

In practice: when the transmission shifts, you will hear a momentary shift in the engine tone. It will sound like your real car does when it shifts gears. Only higher pitched, of course.

 

[nuggetz]

Hmm, here's a pic. Is it installed right?? The 2 bigger gears mesh with the 2 smaller gears. I would imagine only one would be working with its partner gear but I still dont understand how it works. Kinda dirty.

 

[Scrogg]

Centrifugal force overcomes the spring tension on the shifter pawl. All that stuff should be crammed inbetween the two spur gears.

 

[Rs4 drift]

there should be a small whole next to the small gear which has two screws and turn the one closes to the engine counter clockwise