RCCrawler Forums

JoeZilla · 05-20-2005, 05:18 PM

I just upgraded my mostly stock txt to 4ws. The servos don't center that quickly, and don't travel in good unison. They are both jr servos, 650 in front and 590 rear (all that was laying around). They are connected with a y-connector.
Any advice?

BENDER · 05-20-2005, 05:35 PM

It's probably because they are different servos, even with the same servos front and rear it may do this. It depends how your weight is biased on the chassis. If all your weight is in the front, the front will be slower in general.

Independent rear steer is more ideal.

JoeZilla · 05-21-2005, 08:22 AM

Thanks for the reply, i thought the different servos may be some of the cause but had not thought of the weight bias.

Anyone else experience this?

Train Of Thought · 05-22-2005, 01:30 AM

Well, the TXT-1 is a heavy truck with big tires. Even servos with huge torque strain under the load (especially at a standstill). And servo savers just make the situation worse.
Running servo savers?

JoeZilla · 05-23-2005, 05:15 PM

That is another good thought. I have a kimbrough heavy duty, which I thought would not move much, on the front, and just a plastic horn on the back. The front tires are the less responsive (even with the stronger servo), maybe it is that servo saver, I'll take it off and check it out. THANKS!!

old_dog · 05-23-2005, 06:41 PM

I had the same problem you are having when I first built my TXT. The servos were different and each had a servo saver. Replaced them with 645's and got rid of the sevos savers and the improvement was dramatic. Try getting rid of the savers first and then go to matched servos if that doesn't help.

Old_dog

RCMFMaxxMan · 05-24-2005, 01:40 AM

yeah i agree with ditching the savers. If your weight is generally in the center of the rig than matching servos is a good idea. But since you have different ones try putting the stronger one on the end with the majority of the weight if you havn't already.

JoeZilla · 05-24-2005, 04:53 PM

Thanks for the advice guys, I'll pull that servo saver in the next few days and let you know how it worked.

JoeZilla · 05-29-2005, 10:43 AM

You guys were right. taking the servo saver off made a big difference. I would not have guessed a Kimbrough Heavy Duty would still be that spongy. Now I need to find a nice aluminum servo arm with good reach.

Thanks.

RCMFMaxxMan · 05-29-2005, 05:54 PM

http://www2.towerhobbies.com/cgi-bin...vo&FVPROFIL=++
There are some for ya. see if those will work for you. If you want longer you can cut a small piece of aluminum to connect to a servo arm to make it longer.

JoeZilla · 05-30-2005, 02:32 PM

These look great, thanks.

05-20-2005, 05:18 PM	#1
JoeZilla Newbie Join Date: Dec 2004 Posts: 7	4ws advice I just upgraded my mostly stock txt to 4ws. The servos don't center that quickly, and don't travel in good unison. They are both jr servos, 650 in front and 590 rear (all that was laying around). They are connected with a y-connector. Any advice?

05-20-2005, 05:35 PM	#2
BENDER 2006 2.2 National Champ Join Date: Dec 2004 Location: Big Bear Lake Posts: 8,328	It's probably because they are different servos, even with the same servos front and rear it may do this. It depends how your weight is biased on the chassis. If all your weight is in the front, the front will be slower in general. Independent rear steer is more ideal.

05-21-2005, 08:22 AM	#3
JoeZilla Newbie Join Date: Dec 2004 Posts: 7	Thanks for the reply, i thought the different servos may be some of the cause but had not thought of the weight bias. Anyone else experience this?

05-22-2005, 01:30 AM	#4
Train Of Thought Pebble Pounder Join Date: May 2005 Location: Oregon City, Or Posts: 105	Well, the TXT-1 is a heavy truck with big tires. Even servos with huge torque strain under the load (especially at a standstill). And servo savers just make the situation worse. Running servo savers?

05-23-2005, 05:15 PM	#5
JoeZilla Newbie Join Date: Dec 2004 Posts: 7	That is another good thought. I have a kimbrough heavy duty, which I thought would not move much, on the front, and just a plastic horn on the back. The front tires are the less responsive (even with the stronger servo), maybe it is that servo saver, I'll take it off and check it out. THANKS!!

05-23-2005, 06:41 PM	#6
old_dog Pebble Pounder Join Date: Oct 2004 Location: Indianapolis Posts: 182	I had the same problem you are having when I first built my TXT. The servos were different and each had a servo saver. Replaced them with 645's and got rid of the sevos savers and the improvement was dramatic. Try getting rid of the savers first and then go to matched servos if that doesn't help. Old_dog

05-24-2005, 01:40 AM	#7
RCMFMaxxMan RCC Addict Join Date: Jun 2004 Location: ORegon Posts: 1,002	yeah i agree with ditching the savers. If your weight is generally in the center of the rig than matching servos is a good idea. But since you have different ones try putting the stronger one on the end with the majority of the weight if you havn't already.

05-24-2005, 04:53 PM	#8
JoeZilla Newbie Join Date: Dec 2004 Posts: 7	Thanks for the advice guys, I'll pull that servo saver in the next few days and let you know how it worked.

05-29-2005, 10:43 AM	#9
JoeZilla Newbie Join Date: Dec 2004 Posts: 7	You guys were right. taking the servo saver off made a big difference. I would not have guessed a Kimbrough Heavy Duty would still be that spongy. Now I need to find a nice aluminum servo arm with good reach. Thanks.

05-29-2005, 05:54 PM	#10
RCMFMaxxMan RCC Addict Join Date: Jun 2004 Location: ORegon Posts: 1,002	http://www2.towerhobbies.com/cgi-bin...vo&FVPROFIL=++ There are some for ya. see if those will work for you. If you want longer you can cut a small piece of aluminum to connect to a servo arm to make it longer.

05-30-2005, 02:32 PM	#11
JoeZilla Newbie Join Date: Dec 2004 Posts: 7	These look great, thanks.

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