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Old 07-15-2011, 02:29 AM   #1
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Default How much servo torque for 1/8 buggy?

Seems lots of people run a less torquey servo on throttle - seeing as though I am getting back into it after a while and now the torques are even more than a few years back I thought I'd ask why? We used to run a HS-645MG on both.

Now, about 14kg on steering and 10-12kg (133oz I think) on throttle seems to be common.

Is there such thing as too much torque on the carbie's throttle slider or the brake?


Common seems be see say Hitec 7985 steering and 7965 on throttle.

I am looking at Savox 1258TG and is the 166oz (about 13kg?) too much to use that servo for both steering and throttle?

I can see advantages to same servo on both as then you only need one spare :-)

Last edited by Mark_Australia; 07-15-2011 at 03:54 AM.
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Old 07-15-2011, 02:52 AM   #2
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For well-priced servos with good stats, the 1258 Savox I also would think would be good for both. I have Hitecs already, but if I were outfitting a new buggy, I would probably get 1258's for both.. I have the Spektrum H6040(rebadged Savox 1258) on throttle in my Ofna DM-1 onroad car, and so far totally satisfied.. Very fast, and plenty strong..
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Old 07-15-2011, 03:08 AM   #3
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Id suggest the most powerful servo you can afford. I run Hitec HS5645MG's in most of my RC's. They seem to get the jod done. 150oz+ should be fine.
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Old 07-15-2011, 03:14 AM   #4
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A very good choise of servos are the all new Sav÷x SC-1267MG Digital servo with coreless motor and the 'sister' model SC-1268MG. These servos have steel (metal) gears in stead of titanium and are especially develloped for the use in RC-cars.
The steel gears are wider than the titanium counterparts, and have more 'touch' with each other, which makes the gears more restitant to high impact.

Specs Sav÷x SC-1267MG:
• 0.11 sec/60░
• 13.0 kg/cm torque
• Coreless motor
• Metal gears
• 12 bits - 4096 resolution
Dimensions: 40.3 x 20 x 37.2mm
Weight: 62 g
Case: Aluminium + plastic

Specs Sav÷x SC-1268MG:
• 0.13 sec/60░
• 15.0 kg/cm torque
• Coreless motor
• Metal gears
• 12 bits - 4096 resolution
Dimensions: 40.3 x 20 x 37.2mm
Weight: 62 g
Case: Aluminium + plastic
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Old 07-15-2011, 03:55 AM   #5
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Thanks guys

Still dunno why people run a weaker servo of throttle though - not to save money as often it is the same price
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Old 07-15-2011, 03:58 AM   #6
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the 1258 is good for throttle I would be a little apprehensive with that on steering so to be confident try the 1256 or if you have the battery power go the savox hi voltage as mentioned in the above post, the other servo which is good is the team associated xp1015 now they were flawless in both throttle and steeing strong and superfast and priced at about $100 each but the savox is a little on the cheaper side but down on reliability as I have replaced a 1258 and a 1256 within 6months and zero breakdown on the 1015s.
goodluck
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Old 07-15-2011, 04:13 AM   #7
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i use to use hitech but switch to savox 1257 on all my rc, nice torque & speed
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Old 07-15-2011, 04:42 AM   #8
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Has anyone managed to get a XP 1015 to run in a Hyper 7? It seems just slightly too large. Should I just file the mount out a bit to allow it to fit? I've a couple sitting here not getting used.

Also, will the XP 1015 be rugged enough to cope with the abuse a buggy gets? I used them in my touring cars but never in a buggy.

I'm using a Hitec 645MG for the steering and a Hitec 645 for the throttle.
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Old 07-15-2011, 08:18 AM   #9
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Quote:
Originally Posted by Bart_Banaan View Post
A very good choise of servos are the all new Sav÷x SC-1267MG Digital servo with coreless motor and the 'sister' model SC-1268MG. These servos have steel (metal) gears in stead of titanium and are especially develloped for the use in RC-cars.
The steel gears are wider than the titanium counterparts, and have more 'touch' with each other, which makes the gears more restitant to high impact.

Specs Sav÷x SC-1267MG:
• 0.11 sec/60░
• 13.0 kg/cm torque
• Coreless motor
• Metal gears
• 12 bits - 4096 resolution
Dimensions: 40.3 x 20 x 37.2mm
Weight: 62 g
Case: Aluminium + plastic

Specs Sav÷x SC-1268MG:
• 0.13 sec/60░
• 15.0 kg/cm torque
• Coreless motor
• Metal gears
• 12 bits - 4096 resolution
Dimensions: 40.3 x 20 x 37.2mm
Weight: 62 g
Case: Aluminium + plastic

I run both these servos and both have performed excellently so far.

I just want to add that they are also both HV and can handle 7.4V direct.

The above specs are for 6.0V.


On 7.4V:

Savox SC-1267SG
Speed(@7.4V sec/60): .09
Torque(@7.4V oz-in): 291.0 (20kg)

Savox SC-1268SG
Speed(@7.4V sec/60): .11
Torque(@7.4V oz-in): 347.2 (26kg)



Quote:
Originally Posted by Mark_Australia View Post
Thanks guys

Still dunno why people run a weaker servo of throttle though - not to save money as often it is the same price
It's not so much wanting to run a weaker servo on you're throttle/brake. You want the higher torque servo on steering to hold your line better especially over ruts and bumps and the faster servo on the throttle.

Technology moves forward so you can't compare the servos of years ago to the ones of today. Even as we speak Savox will be releasing the 71 (25kg) and 72 (30kg) which will be replacing the 67 and 68. Guess what, both will have more torque and speed than the servos they replace.

End of the day run what you want. Two 68's will run fine, just as two 67's would.
I run the 67 on throttle and the 68 on steering, both at 7.4V. No problems with either and both were the same price.
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Old 07-15-2011, 08:23 AM   #10
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servos for my 1/8 buggy.
both st th about 20kg within 0.13 sec.
very good high speep st control, consistance th break respond as well.
Motor work just fine. save batt. long turn use. with good performance.
should try, if u like to jump everywhere on track.
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Old 07-15-2011, 12:44 PM   #11
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I currently use Airtronics 94358's and 94359z's. I also use ace xp1015's also. I think my airtonics servos are about 10 years old or so. One of them finally gave way but it was due too worn pin bushings and gears
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Old 07-15-2011, 01:13 PM   #12
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i run the "Savox" 1268mg in my Buggy and put them in my Truggy in March. Both throt and steering. they have not failed. i beat the heck out of them to, currently on my 23rd gallon of fuel since the first of the year.

they are the only servo i will buy anymore. i have had to many Hitec take a dump on me. leading the B Main Truggy at PMBIV by almost a lap and my Hitec throt servo went south with 2 minutes left, had that sucker won. o well woulda shoulda coulda, no more Hitec for me. guess the Hitec could not handle those gaint air jumps at PNB. IMO
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Old 07-15-2011, 03:12 PM   #13
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Quote:
Originally Posted by kilfish View Post
i run the "Savox" 1268mg in my Buggy and put them in my Truggy in March. Both throt and steering. they have not failed. i beat the heck out of them to, currently on my 23rd gallon of fuel since the first of the year.

they are the only servo i will buy anymore. i have had to many Hitec take a dump on me. leading the B Main Truggy at PMBIV by almost a lap and my Hitec throt servo went south with 2 minutes left, had that sucker won. o well woulda shoulda coulda, no more Hitec for me. guess the Hitec could not handle those gaint air jumps at PNB. IMO
+1 to using the savor 1268 servos. I have had them in a 6t since November on straight lipo and they don't skip a beat. They are the best bang for the buck out there. With torque IMO more is always the goal. The higher the torque the less work the servo actually has to do to turn the tires or apply the brakes. On the throttle it docent take much to open the carb, if your linkage in a clean non-bind install, but it does require some torque to apply the brakes and hold them. The newer cam/ piston style brakes seem to require least torque to hold but stillthe less strain you put on a servo the longer they will last.

Best servo on the market rigt now is the new KO hv line but you will pay double for them compared to savox. I have tried just about every brand there is. Some guys like to run a fast response servo on the steering, personally I have to turn the speed down on my transmitter for it to feel good to me, unless I'm just out spinning doughnuts the new brushless line of hitec looks promising in that they provide huge #'s in torque and suck very little out of the batteries. Those guys that like to shave weight can get away with runnig a smaller lipo with these.
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Old 07-15-2011, 05:24 PM   #14
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I've just switched from the hitec 7945/7950 (23kg/35kg) to the savox 1251/1256 (10kg/20kg) in truggy and the lower rated savox's are working just as good as the hitec's. I mainly went the savox route to save weight
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Old 07-15-2011, 05:38 PM   #15
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I would say a minimum of 200oz on Servos...

As for the Savox I was a team driver for them some time ago. I always found the 1258s started a race well.... But 10 minutes in they would heat up and loose a ton of power.

I did talk to the factory about 4 months ago and they said that was a kown issue and has since been fixed on the HV line of servos. I am sure Bart Bannana would concur.

Over all though the Savox or Spectrum are well worth the quan. .. I NEVER had a single one fail tell my last race. I have been running them for 2 years.
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