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Old 08-25-2012, 09:52 AM   #1
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Default Steering servo, how much torque/speed?

I am in the market for a new steering servo for my RC8. It has the original RTR servo that came with it. Its only 41 oz-in and 0.19 sec. It is super weak, and can barely pull the brakes. I upgraded my steering servo to a Savox 1256tg, but I think that would be overkill for a throttle servo. So the question is, how much torque/speed is enough, without being too much. Trying to save my $$ as much as possible.
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Old 08-25-2012, 10:35 AM   #2
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about 80 oz of torque and .15 or faster speed.
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Old 08-25-2012, 11:29 AM   #3
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80oz is too low for buggy.

150oz minimum, speed .15 or faster
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Old 08-25-2012, 11:45 AM   #4
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Sounds like a good throttle servo is what you are after if I read your post right,

You can go with a Futaba 3305. It's pretty cheap and has metal gears (should last a while). It's got right at or close to 200 oz. of torque and the speed is I think .15. I know a number of racers that use that servo for both steering and throttle in a buggy.

There are many to choose from at all different price ranges. If you can go with something around 120 oz of torque or better and .15 on speed or faster you should be good for the throttle
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Old 08-25-2012, 04:18 PM   #5
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Quote:
Originally Posted by chopper82p View Post
80oz is too low for buggy.

150oz minimum, speed .15 or faster
+1. Been running a JR 9100S for about 6 years now. Have only replaced 2 cases because the design for the center shaft hoggs out and it gets a twitch when the wheels are off the ground.

150+ oz/in @ .15 seconds or better would be more than enough for any 1/8 buggy.
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Old 08-25-2012, 06:31 PM   #6
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I like the Hitec 965MG's on throttle. 0.10 sec and 139 oz/in @ 6v according to their website. Shop around and you should be able to find one for about $60.
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Old 08-25-2012, 06:34 PM   #7
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I run Hitec 7955's on both channels, straight up lipo.
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Old 08-25-2012, 06:45 PM   #8
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The throttle part doesnt need much power, true, but the brake part does, and speed is real important here. You need to be able to get on or off the gas or brakes asap. You have a normal bit of lag in radio transmission and then to the servo and if its slower, it adds up to lost time waiting for stuff to happen. In order to be a smooth, consistent driver, you need to be able to act and not react. Going too cheap on servos only hurts you in the long run. brakes need (IMO) at least 150oz and sub .15 times....preferably sub .13 One of the reasons guys go to high volt servo's now days is due to the speed. Not saying you need those, but its a reason they have gained popularity. Speed for the throttle/brake is more important than speed in the steering actually.
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Old 08-25-2012, 09:00 PM   #9
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Quote:
Originally Posted by chopper82p View Post
80oz is too low for buggy.

150oz minimum, speed .15 or faster
+1, 200oz+ would be best but you can get away with 150oz... IMHO you cant beat the Hobbico CS-170 servo on tower hobbies, it is the Hitec 7955 with a different sticker, exact same servo for less.
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Old 08-25-2012, 09:44 PM   #10
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I used one of the Airtronics 94358 and 94359 for a long time on throttle/brake. 200oz @ .10 And still own them. The only reason I stopped is they are analog and the digital's have better centering.
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Old 08-25-2012, 10:15 PM   #11
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Quote:
Originally Posted by mberta2 View Post
I am in the market for a new steering servo for my RC8. It has the original RTR servo that came with it. Its only 41 oz-in and 0.19 sec. It is super weak, and can barely pull the brakes. I upgraded my steering servo to a Savox 1256tg, but I think that would be overkill for a throttle servo. So the question is, how much torque/speed is enough, without being too much. Trying to save my $$ as much as possible.
most guys here run the 1256 on steering with the 1258 on throttle/brake. the 1258 is a 170oz/in servo and super fast at 0.08s @ 6V. The 1256 being a 280oz/in servo and 0.15se @ 6 V is great on steering. people use them on throttle as well but at almost half as fast as the 1258 it might not be the best choice.
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Old 08-26-2012, 12:00 AM   #12
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Quote:
Originally Posted by Jerm13 View Post
+1. Been running a JR 9100S for about 6 years now. Have only replaced 2 cases because the design for the center shaft hoggs out and it gets a twitch when the wheels are off the ground.

150+ oz/in @ .15 seconds or better would be more than enough for any 1/8 buggy.
I had the same problem with my JR Z9100S
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Old 08-26-2012, 12:42 AM   #13
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Quote:
Originally Posted by jmaxey51 View Post
IMHO you cant beat the Hobbico CS-170 servo on tower hobbies, it is the Hitec 7955 with a different sticker, exact same servo for less.
CS-170 is old Hitec 5955, not 7955. See here: Servo Advice Please!!
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Old 08-26-2012, 01:18 AM   #14
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I run stright lipo with savox 1268 on steering and 1267 on throttle.
I did use the 1258 before with nimh both steering and throttle.
it is faster on the paper but not in the track.Witch means that it is to weak for stable steering.

have even used the 1267 on steering and felt the switch to 1268 was faster and more consistent in my hometrack.That are werry hard and bumpy..



Savox SC-1268SG High Torque Steel Gear Digital Servo (High Voltage)-savsc1268sg
List Price $115.99
Map Price $95.99
You save $20.00!

Dimensions(mm): 40.3x20.2x37.2
Weight(g): 62.0
Speed(@4.8V sec/60): .15
Torque(@4.8V oz-in): 160.0
Speed(@6.0V sec/60): .13
Torque(@6.0V oz-in): 208.3
Speed(@7.4V sec/60): .11
Torque(@7.4V oz-in): 347.2
Gear: Unique Steel
Bearing: 2BB
Case: Aluminum


Case: Aluminum



Savox SC-1267SG Super Speed Steel Gear Digital Servo (High Voltage)-savsc1267sg
List Price $115.99
Map Price $95.99
You save $20.00!

Dimensions(mm): 40.3x20.2x37.2
Weight(g): 62.0
Speed(@4.8V sec/60): .13
Torque(@4.8V oz-in): 130.0
Speed(@6.0V sec/60): .11
Torque(@6.0V oz-in): 180.5
Speed(@7.4V sec/60): .09
Torque(@7.4V oz-in): 291.0
Gear: Unique Steel
Bearing: 2BB
Case: Aluminum
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Old 08-26-2012, 01:38 AM   #15
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Quote:
Originally Posted by xray808-11 View Post
I run stright lipo with savox 1268 on steering and 1267 on throttle.
I did use the 1258 before with nimh both steering and throttle...
the 1258 should not be used on steering
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