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Old 07-25-2009, 06:50 PM   #1
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Default Torque VS speed in servos

BEing new to rc i just got an 8ight 2.0. I plan on running lipo for my receiver pack but im trying to understand the torque vs speed thing. I would think you want high speed for all aplications but what would e good for spped and what would be good for torque when looking at off road 1/8th scale and wherre would i put what servo?
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Old 07-25-2009, 07:21 PM   #2
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BEing new to rc i just got an 8ight 2.0. I plan on running lipo for my receiver pack but im trying to understand the torque vs speed thing. I would think you want high speed for all aplications but what would e good for spped and what would be good for torque when looking at off road 1/8th scale and wherre would i put what servo?
inmo.........torque goes up front on steering ....speed goes on throttle for the response ....alot of people including myself run the same on both ...last year i ran ace 1015's for both and it worked out great ....this year i ran jr 9100s on throttle and 9100t on steering ....you could definitely notice the difference between .05 and .15 on the speed ....if you run the 79series hitechs you dont need a regulator ..that is what im planning on running next year
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Old 07-25-2009, 07:25 PM   #3
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Usually you want a good torque servo as your steering servo to move those big tires left and right, and you want a high speed servo for your throttle/brake. I have been running the Hitec 7955 for my steering and just a decent speed servo for my throttle/brake. I have used the Hitec 5955 and 7955 for just over two years with no problems. They are a little pricey, but I have had zero issues with them. In my opinion, spending a little more for servos in the beginning will save money in the long run. I have tried airtronics and cheaper JR servos before, but they ended up dying on me anyway. Another one to look at is the JR9100T, I have one in my X-ray and have had no issues with it either.

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Old 07-25-2009, 07:32 PM   #4
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basicaly tork in front for steering speed in back for throttle.

thats its.
you can change the servos around based on how you want the car to handle but that is the main setup most people use.

hope this helps
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Old 07-25-2009, 07:47 PM   #5
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You want the speedy servo on the Throtle/Brake and Torque for steering.
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Old 07-26-2009, 07:17 AM   #6
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I agree with all the others except that there are plenty of servos that deliver both good torque and speed.
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Old 07-26-2009, 09:18 AM   #7
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Originally Posted by zixxer View Post
inmo.........torque goes up front on steering ....speed goes on throttle for the response ....alot of people including myself run the same on both ...last year i ran ace 1015's for both and it worked out great ....this year i ran jr 9100s on throttle and 9100t on steering ....you could definitely notice the difference between .05 and .15 on the speed ....if you run the 79series hitechs you dont need a regulator ..that is what im planning on running next year
Only the hitec 7955 is able to run unregulated on a 7.4 lipo without difficulty. This information comes from hitec directly. (CLICK HERE) Personally I like the faster servos for throttle and brake and I agree you can tell the difference from .05 to .15. I dont like to use anything slower than .10 for the throttle and brake so currently I use a 7955 for steering and a 7965 for the throttle. Until the 7950 and 7940 come out in August. These servos are specificly designed for unregulated 7.4 lipo operation. Last season I used the JR 9100s/t and they were not bad. I just like the hitec servos better. Theres my 2 cents
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Old 07-26-2009, 09:28 AM   #8
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I agree with all the others except that there are plenty of servos that deliver both good torque and speed.
+1
thats why i run jr 9100s on both, and wouldn't think of going any other way.
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Old 07-26-2009, 10:05 AM   #9
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Don't get too hung up on the numbers. 125-150oz torque on steering is plenty for a buggy and if you're running unregulated lipo, whatever you choose will be faster and stronger than the manufacturer's stated numbers. Just make sure the servos you choose can handle it, torched servo notwithstanding, if you cook a throttle servo at the wrong time it could take your engine with it.
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Old 07-26-2009, 11:19 AM   #10
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I think torque is more important than speed. If you dont have the power to turn and hold the wheels it makes no difference how fast the movement is supposed to be.

If you wanna use a lipo then your best bet is to get servos that can handle then unregulated. Regulators have a high failure rate so a set-up that doesnt need one will be far more reliable.

I use a Spektrum radio and Hitec 5955 servos with a Reedy lipo unregulated. When I first went lipo I used Ace 1015 steering and 1313 throttle and frankly I thought they were so fast it made the buggy twitchy and hard to drive. Thats when I bought the 5955 servos. They have tons of torque but a little slow at 6.0v but with the lipo power they are plenty quick.
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Old 07-26-2009, 11:22 AM   #11
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I should also add that you do need some torque on your throttle servo for the brakes. Fortunately all your good modern servos (good ones, not el cheapos) have enough but back in the day before digitals a weak servo could mean very little brakes.
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Old 07-26-2009, 01:45 PM   #12
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Get as much servo as you can afford you will never regret having too much torque. and quality servos from JR , Airtronincs last and yo will have them for a long time. dont scrimp buy it only once..
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