Sharkey_t

no they dont drop right in, shimming is required. the .56fsa is just like the fs52, the spring pockets are deeper and they use longer springs, however shimming the springs up so they sit above the pockets allow the spring to be used and there is still plenty of room to avoid coil bind.

speedworks

iTrader: (3)

So made it to the track today for a bit. Mixed results, first stock motor stock kyosho 2 speed gearing speed runs- 26mph max off phone GPS.

Next track test, ok for only a bit then lost low end power. Looks like dirt in the 2 speed is causing 2nd gear lockup. This is bad and I'll have to tear down to verify but that's what it looks like. Thinking the kyosho trans may not be the way to go for off-road use. The redcat style will probably be better if it holds up.

Also looks like 15/46 or 15/47 would be a great first gear for truggy. Plenty of get up, but as you can see from GPS it still needs more top end.

Edit-- trans update!!!
No dirt in trans, one of the springs worked it's way through the bolt hole causeing trans to not close all the way! Trans had NO dirt what so ever in it. Very surprised as I have been running it without body and throwing sand all over the inside. All is good

speedworks

iTrader: (3)

Timjs, how did you calculate that speed figure in earlier post? It was real close to what mine ran, I'm wondering what 15/47 first and 20/42 second would give for top speed?

Sharkey_t

i use this gear ratio calculator Gear Ratio Calculator its meant for full size cars but it works just fine for r/c.

speedworks

iTrader: (3)

Cool, now just have to figure out how to calculate the ratios of everything..

Edit.. Ok so looks like my motor is spinning around 16,000 rpm to reach that 26mph. Need about 3,000 more rpm and I'd be at 2stroke race speed.

timjs

Nice update man!
I just do the math. Clutch bell and spur ratio, diff ratio, tire diameter...then you can calculate speed per X amount of RPM and so on..

Or use the gearing calculator of course!

timjs

I just realized..
Do you actually have a 5 tooth spread? I ordered the Kyosho 2 speed from the Inferno gt2 RS. It has the 46/43t spur gears.
I'd love a 5 tooth spread, if it would actually mesh okay. What I mean by that is even though the total tooth count for first and second gear add up to the same number, the relationship between tooth count and gear diameter is not linear so having too much of a spread can cause the gears to mesh differently. I believe Sharky went through this with his two speed.

speedworks

iTrader: (3)

Gotcha, I also found another gear calculator online and it comes out the same. Going to look into a few things on the truck and see where to go from there.

speedworks

iTrader: (3)

Nope I have the same kyosho setup as you bought. But was thinking,,, redcat 2speed with kyosho bell. 15/47 and 20/42. That will probably be my next trans setup.

timjs

Gotcha. I'd be very interested in how the redcat trans works. I'm in no rush to try mine, it just looks so flimsy.

speedworks

iTrader: (3)

Not sure when I'll get a chance to try it either. I do have another truggy chassis sitting here I'd like to put it in. Only thing is I'll need a set of angled motor mounts, intake,servos and so on. Basicly another decent size investment, we'll see maybe down the road. Still have to get the machines also.

timjs

It's here!
Got the Kyosho trans on the way, as well as that copper-tungsten rod.

speedworks

iTrader: (3)

Awesome looking truck, that will be bad ass with the 4 stoke in it! Will be interesting to see how you make everything fit in it. Keep us posted with photos, any idea when you'll start the build?

timjs

I'll definitely post updates and stuff.
I want to start this weekend, but I won't have the Kyosho parts yet I think, so the most I can do is probably removing the Dynamite .28 and see what kind of room I'll be working with.
Also, I have another badass RC project that gets priority which I'm hoping to get finished up this weekend. I have to build engine mounts for that particular truck. When it's done I'll post in that vehicle's RCtech thread and shake it up a bit. I'm pretty sure it will be the first of its kind.

Anywho back to the thumper, did you happen to snap some pics of the clutch shoes with the tungsten rod?
I was also thinking, that stuff seems like a fantastic way to make my flywheel even heavier, which would be great!

speedworks

iTrader: (3)

No pictures of clutch yet but I'll have it tore down again here soon. I just put one piece of rod in each shoe. They come out to 2.8g each, I got me a small scale now.