NitroNation
Mister QUESTION with no SEARCHIES
- Messages
- 211
i recently installed this servo on my savage xs and even this has weak turning strength with only 2s. i have 3s packs ready to go looks like i need a stronger servo....any suggestions??
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
sf-20 servos are weak.......
Pretty much anything else with metal gears will be better. Hitec, futaba, savox, Get something with a lot of torque, but not too much (400oz in is NOT needed)
i recently installed this servo on my savage xs and even this has weak turning strength with only 2s. i have 3s packs ready to go looks like i need a stronger servo....any suggestions??
I have no idea what voltage its set to nor do i know how to set it...
I have no idea what voltage its set to nor do i know how to set it.../QUOTE]
If you don't know what it's set at, then it's set to the default voltage, which is 4.8v. The only way to change it is via castle link or the field programming card. The castle link software is free to download from castle's website, but you'll need the adapter to connect the esc to your comp. I can't remember how much it is, but you can probably find it for a good price on ebay. I got mine free when I origanlly bought my castle MMP for my blitz. I highly suggest you get the adapter and castle link software, the tuning possibilities are endless with it. Also, since you insist on going with 3s, you'll definitely have to add punch control and limit the torque on the motor with 3s. I did and even on 2s it's still a monster. That's why I gave up on using 3s,it's really wasn't that fun to drive. I haven't found a wide open enough space yet to run it on 3s at full throttle. And it also wasn't fun anymore having to walk 200-300 ft. every couple min to flip it back on it's wheels when the torque on 3s makes it flip on it's lid. But, you'll learn the hard way instead of taking veteran members advice.
Your are completely wrong. The sf-20w servo is plenty strong enough for the xs. Unless you actually have an xs, which I do and know what it's needs, more torque isn't always the answer. It has 100% to do with the servo saver. When I bought my xs used, the guy already upgraded the servo to a traxxas one that has about the same amount of torque as the sf-20w,which is plenty. The xs doesn't weigh as much as the full size savage so it doesn't need 150+ in-lbs of torque. 100-125 max in-lbs is all it needs. You've got to remember that the xs isn't actually a 10th scale rc car, it's actually smaller than 12th scale but bigger than 18th scale. He's also limited on torque values because he's only got 4.8v going to the servo. If he takes my advice, which time will tell, then he can program the esc settings and bump up the voltage to 6.0v, which will increase the torque output of the servo. He can also go to 7.4v as long as the servo is designed to handle that voltage.Small or big savage, either way the sf 20 is a weak servo, and more torque is always good, you just need to set the endpoints right so you don't tear stuff up.
Well, I'm done here, no more arguing
This is going to be my last comment on this matter, if it sinks in, it sinks in, if not, oh well... Sometimes "more" isn't always the answer, as with the xs. You still keep comparing it to the full size savage which weighs 3 times as much as the xs. So 150 in-lbs of torque is not needed, and only really need right around a 100 in-lbs of torque. The main problem with the steering is the servo saver. Just like the full size savage, the spring is rather weak and that's where most of your torque is being lost. That's also the reason why HPI came out with an HD spring for the servo saver on the full size savage when companies started coming out with stronger servos. As for speed, when you get a high torque servo you sacrifice speed, as with if you get a high speed sero you sacrifice torque. But with the xs and the high speeds (mph) it can go, a fast response servo is not what you want. If your goin full speed on 3s in the xs, which is a little over 50 mph, and you can't turn the wheel in small, smooth increments, your asking for a damaged truck. Imagine going 120 mph in a ford f150 and jerking the wheel left or right, what do you think will happen?Well, yes, obviously, if he sets the voltage up to 6v then it will be a huge increase in performance.
Still, you can't go wrong with more torque. Is it needed? no. Is it better? yes Remember, the sf-20 is also pretty slow, so a high torque upgrade will most likely increase the speed also.
Another point, the sf-20 breaks easily due to weak plastic gears. A metal geared one will be far more reliable. I have owned 4 or 5 sf-20's, two of them blew up for no apparent reason, and one other one stripped the gears on a tiny little jump. The other two (the older ones that came in the savage x 4.1) are still going.
Welcome to HPISavageForum, a friendly forum to discuss the Savage RC Truck.
Your voice is missing! You will need to register to get access to the following site features:We hope to see you as a part of our community soon!