2revo1maxx
Hardcore RCTalk User
He means gear it up. Larger pinion and/or smaller spur.
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Need for Speed
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Greywolf74
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when I say gear down I'm talking about the gear ratio. lower the gear ratio the higher your top speed will be. If his motor is only running at 100F then he can gear down for more speed. this will increase motor temps but as long as he stays under 150F then he can get more speed out of his rig. That is of course if he wants to. If its fine the way it is then just leave it be 
2revo1maxx
Hardcore RCTalk User
Sorry, but you have to gear higher to increase speed. You need a higher ratio, like a 20 tooth pinion on a 68 tooth spur is higher than a 19 tooth pinion on a 68 tooth spur....for example.
First gear on your car is low gear. 5th is high gear.
First gear on your car is low gear. 5th is high gear.
Greywolf74
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a 16T pinion with a 90T spur give you a gear ratio of 5.625:1 (90/16)....increasing your pinion to lets say 28T and decreasing your spur to say 62T gives you a gear ratio of 2.214:1 (62/26). The closer the spur and pinion are in size (or the lower the gear ratio) the more top speed you have. a 1:1 gear ratio, or the lowest gear ratio there is, is where your pinion and spur are the same size. So I submit to you again in order to get higher top speed you lower your gear ratio or gear down and in order to get more torque you raise your gear ratio or gear up.
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2revo1maxx
Hardcore RCTalk User
That doesn't explain why low gear is low gear and high gear is high gear. 1:1 is the highest ratio possible, before you get into and overdrive ratio.
5.625:1 is a very LOW ratio. You got it backwards.
5.625:1 is a very LOW ratio. You got it backwards.
jtboogie
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I to am lost to because usually higher ratios are for higher top speed and lower is for more torque. Just like a vehicle that you actually drive. Trucks are geared lower to provide torque as where a sports car is higher geared for more top speed. same with r/c I believe.
2revo1maxx
Hardcore RCTalk User
Right!^
Greywolf74
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Do I have it backwards? 5.6 is a higher number than 2.2? how can you call 5.6 a lower number than 2.2? I'm not trying to argue but thats the way it was taught to me and I'm curious is what I was taught wrong or whats going on? Ill call one of the LHS pro's that I kinda sorta know and ask him about it. I'm sure he will know and i'll share what he says on it also. That is of course if he works today.
Even if I do have the low and high terms backward Dbnjzb, the principal is correct...the closer the pinion and spur gear size are together the more top speed you will get. the further they are apart the more torque you get.
Even if I do have the low and high terms backward Dbnjzb, the principal is correct...the closer the pinion and spur gear size are together the more top speed you will get. the further they are apart the more torque you get.
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Greywolf74
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as luck would have it my hobby shop pro doesn't work today. I'll try him back tomorrow. Any one else have any knowledge of this feel free to chime in. If I'm wrong I dont want to continue using the wrong terminology.
Greywolf74
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Ok so after doing alot of reading on the internet I found this:
http://teamassociated.com/pdf/cars_and_trucks/shared/gear_ratios.pdf
If you skip down to the section call Understanding gear ratios it talks about cars that are undergeared and cars that are overgeared. It says that a car thats undergeared has either two small of a pinion or to big of a spur gear. We all know this type of gearing to have a lot of torque and acceleration but less top speed. Then it talks about overgeared cars being just the opposite. So if a car is undergeared and you want more top speed you would want to gear up (or in other words make your ratio a lower number) and if you want more acceleration you would gear down (or make your gear ratio a bigger number). It sounds like the opposite of what would be logical and maybe back when I first learned it I got the two mixed up because it seems like if you were gearing down you would be making your ratio get smaller but from what I just read its the opposite so it looks like you guys were right and I just had to reteach myself. Ill have a hard time keeping that one straight I think lol. Learn something new everyday.
http://teamassociated.com/pdf/cars_and_trucks/shared/gear_ratios.pdf
If you skip down to the section call Understanding gear ratios it talks about cars that are undergeared and cars that are overgeared. It says that a car thats undergeared has either two small of a pinion or to big of a spur gear. We all know this type of gearing to have a lot of torque and acceleration but less top speed. Then it talks about overgeared cars being just the opposite. So if a car is undergeared and you want more top speed you would want to gear up (or in other words make your ratio a lower number) and if you want more acceleration you would gear down (or make your gear ratio a bigger number). It sounds like the opposite of what would be logical and maybe back when I first learned it I got the two mixed up because it seems like if you were gearing down you would be making your ratio get smaller but from what I just read its the opposite so it looks like you guys were right and I just had to reteach myself. Ill have a hard time keeping that one straight I think lol. Learn something new everyday.
2revo1maxx
Hardcore RCTalk User
I should've mentioned that it's all kinda bass-ackwards. Looking at numbers it can be confusing.
The second part of post # 29 is all the OP needs though.
The second part of post # 29 is all the OP needs though.
Greywolf74
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Well they say you learn something everyday. I knew what I was saying I just used the wrong terminology. now I know. Hope I didnt confused the OP to much. what I said was right they just use the gear up and gear down terms back-asswards lol
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2revo1maxx
Hardcore RCTalk User
We're all wrong from time to time, but being able to admit it is what seperates the men from the boys.
2revo1maxx
Hardcore RCTalk User
Sweet! Now just a little research and maybe some temp readings you'll be able to squeeze out all the speed it can produce, safely.
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