Gearing

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GTi_Leo

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heres a topic that may be pretty good info for some people. I just built a 30.5cc king motors engine with a CY stuffer crank, ported and polished it with a Jetpro XB side mounted pipe and 8k clutch spring. its pretty beefy, only thing is my XB came with a 2 speed when I bought it and I'm not sure what brand or what gearing it has and there is to much low down power and not enough top end. its incredibly tough to keep the wheels from slipping to much at launch.


curious as to a gearing set I can go with or should I just find a stock transmission set. am I just able to replace the gears on the 2 speed with some longer gears and is there a spur set that I can swap that is a bit longer then the stock 30 tooth
 
That's a demon rc 2 speed. Unfortunately they seem to be out of business so I don't know where you could get other gear ratios...
 
I thought it was a demon RC just couldn't be sure, I'm not even sure what gear set is on it

question: I've read a few post about one way bearings being backwards, how would I be able to tell if this is the case. I'd hope its not but just would like to make sure
 
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The backwards bearing was in a chinese clone, I doubt you could have such an issue. Regarding the gear set, you can count the teeth.
 
I'm not sure it doesn't seem that both gears move freely seems that they move together, not sure how these things work, I kind of want to take it apart to see, just not sure if i'll be able to put it together again and can't really find a how too take it apart thing
 
GTi_Leo said:
heres a topic that may be pretty good info for some people. I just built a 30.5cc king motors engine with a CY stuffer crank, ported and polished it with a Jetpro XB side mounted pipe and 8k clutch spring. its pretty beefy, only thing is my XB came with a 2 speed when I bought it and I'm not sure what brand or what gearing it has and there is to much low down power and not enough top end. its incredibly tough to keep the wheels from slipping to much at launch.curious as to a gearing set I can go with or should I just find a stock transmission set. am I just able to replace the gears on the 2 speed with some longer gears and is there a spur set that I can swap that is a bit longer then the stock 30 tooth
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I think power might be what's making it wheelspin rather than gearing.

I'm running 1:1 with a belt drive and it still spins up
 
for sure its power, I'm not saying its not the power but with the amount of power I can lengthen the gearing and have things more manageable so I'm not constantly doing donuts.

theres so much power it gets crazy squirrely when trying to control the thing at WOT not to mention I'm still on the stock XB knobby tires, that doesn't help to much. should look to invest in hub adapters and get a set of king motors trenchers and a set of tarmacs, but I'm cheap :p
 
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I can relate to that

I haven't got the power you have but still have to be careful how I apply the power or it's all over the place.
 
I'm the one with the backwards one way bearing. I'm glad tomorrow is Saturday and I'm off work, here lately I get off work at 4:30 and it's dark at 5:00 by the time I get home so I have not been able to drive my rampage at all. I have adjusted the paw spring set screw and will be driving it tomorrow. Anyone have any tricks to remove a stripped set screw that's set in lock tite? My final gear that's attached to the last shaft where the brakes are has a set screw and I stripped it out, guessing locktite did a super job on that one. Reason I want to remove it kind of relates to this post, I have a second set of gears that manufacturer seis Is for really high top end that I purchased while they sent me the correct one way bearing, the gears that are on there now are slightly higher than factory gearing and second set is for a lot higher top end. I have not got to use it much thanks to bad settings on high and low needels causing plug fowling but hoping tomorrow is a good day and really need to figure out how to remove that stripped set screw.
 
Rroberson7805 on the stripped screw try a reversed drill bit or a easy out set. Did you get the message I sent you back on Wednesday about setting up your shift point on your transmission?
 
GCraig said:
Rroberson7805 on the stripped screw try a reversed drill bit or a easy out set. Did you get the message I sent you back on Wednesday about setting up your shift point on your transmission?
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this, but before you try it heat it up with a torch or something to try and melt off the Loctite so its a bit easier to break loose.

which gears are you putting on to get a bit more top end?

GCraig said:
You can replace the gears on the 2 speed. What are you looking for more torque or speed?
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more speed I'm looking to reduce the torque to the wheels to get more speed. I'm thinking the 6k clutch spring may also be enough thrust, the 8k may be a bit more power then the car needs down low, stock XBs aren't that heavy after all
 
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GCraig said:
You can replace the gears on the 2 speed. What are you looking for more torque or speed?
Click to expand...
more speed I'm looking to reduce the torque to the wheels to get more speed. I'm thinking the 6k clutch spring may also be enough thrust, the 8k may be a bit more power then the car needs down low, stock XBs aren't that heavy after all
 
GTi_Leo said:
this, but before you try it heat it up with a torch or something to try and melt off the Loctite so its a bit easier to break loose.which gears are you putting on to get a bit more top end?

more speed I'm looking to reduce the torque to the wheels to get more speed. I'm thinking the 6k clutch spring may also be enough thrust, the 8k may be a bit more power then the car needs down low, stock XBs aren't that heavy after all
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6K is plenty and gentler on the drive train.

Hitting it with more will just wheelspin as you've found.
 
The 8k clutch is great if running on tarmac with tarmac wheels. Otherwise, you're just getting lots of wheelspin.
 
GCraig said:
Rroberson7805 on the stripped screw try a reversed drill bit or a easy out set. Did you get the message I sent you back on Wednesday about setting up your shift point on your transmission?
Click to expand...
Yes I got the message and it worked. The transmission was in 2nd gear the whole time. As soon as I got it running and opened the throttle (it was a lot stronger on take off) I stripped or loosened a drive shaft nuckel (not sure what it's really called but where the set screw is on the drive shaft coupling) and have not had time to find it yet, i have 4 kids and been doing family activities all weekend. I'm thinking it's somewhere right after the brakes and before it splits from front to rear drive shaft. The transmission would just spin, then grab, spin then grab after that first really hard launch. I was on concrete with tarmac busters so it was grabbing good. I do remember when installing the transmission there was something I did not like with a set screw in that area. View attachment 7887uploadfromtaptalk1447639041352.webp

uploadfromtaptalk1447639041352.webp

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GTi_Leo said:
this, but before you try it heat it up with a torch or something to try and melt off the Loctite so its a bit easier to break loose.which gears are you putting on to get a bit more top end?

more speed I'm looking to reduce the torque to the wheels to get more speed. I'm thinking the 6k clutch spring may also be enough thrust, the 8k may be a bit more power then the car needs down low, stock XBs aren't that heavy after all
Click to expand...
It was 2nd highest on their chart of gears. 36t 20t on there now and other set is 40t 15t I think.
 
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