jumpy throttle servo after new steering servo. HELP!

[jkelt]

I just installed a Hitec 7955tg titanium gear servo and ever since my throttle servo is really jumpy. If i pick the front end off the ground and set it back down it mostly stops jumping but as soon as I turn the wheels it starts again. If i unplug the new steering servo the jumping stops also. Any help from the pros here is much appreciated!

Thanks
James

 

[jkelt]

more info

the titanium gear is digital. throttle servo is stock analog. dunno if tx is digital or analog. It is a sanwa mx-3 fg fhss. made by airtronics

 

[Core]

interesting...
i have the 7955tg as a steering servo too and also have the twitching. both the analog throttle and digital steering servo twitch like mad when i hook up my glow igniter or use the rotostart. i'm planning on switching to a new radio ( if i can decide between a spektrum or fubuta 3pm) soon and was gunna wait to see if that mellowed things out a bit.

 

[frddyj]

I just installed a Hitec 7955tg titanium gear servo and ever since my throttle servo is really jumpy. If i pick the front end off the ground and set it back down it mostly stops jumping but as soon as I turn the wheels it starts again. If i unplug the new steering servo the jumping stops also. Any help from the pros here is much appreciated!

is this your Radio Tx James?http://www.rcuniverse.com/magazine/newproduct.cfm?product_id=3691 if so its a 2.4Ghz digital so your in good shape on that end.

given that the twitching stops when you unplug your digital servo, imma guess that your analog t/b servo doesnt like running in digital mode. (i get a bit of 'twitch' when i run my analog servos in dig mode with the Futaba 3PK)

id say it'd be worth a shot upgrading your t/b servo to something digital.

also, if your not already, run a 6v hump pack in your truck.

interesting...
i have the 7955tg as a steering servo too and also have the twitching. both the analog throttle and digital steering servo twitch like mad when i hook up my glow igniter or use the rotostart. i'm planning on switching to a new radio ( if i can decide between a spektrum or fubuta 3pm) soon and was gunna wait to see if that mellowed things out a bit.

Yours sounds like its getting signal interference with the metal on metal contact from your glow ig or roto. Are you runnin a AM Tx/Rx?

 

[Core]

Yours sounds like its getting signal interference with the metal on metal contact from your glow ig or roto. Are you runnin a AM Tx/Rx?

stock from the box, which i guess is AM. even before i touch anything metal to the truck, they're still twitchy. i may just put an analog steering servo back in and wait to go digital and 2.4ghz, seems like the cheaper choice right now, since i'm thinking about picking up a revo vxl

 

[jkelt]

yeah the one in the little box on the left is mine. it is 2.4 Ghz. just threw in a HS-5485hb standard digital hitech in for the t/b and it doesn't twitch now, unless its at full throttle or brake. It also seems like there is a delay every couple seconds. if I pull trigger then hit brake continuously over and over, it doesn't move w/ my finger. It's like it's not getting a signal for a second every few seconds. I bought a hump pack which is charging right now. I'll update once I try that. All problems cease to exist when I pull out the 7955tg though??? ugh

 

[jkelt]

whatever it was the hump pack fixed it! yesssss! must not have been getting enough volts i guess.

 

[frddyj]

whatever it was the hump pack fixed it! yesssss! must not have been getting enough volts i guess.

yep, i thought voltage was suspect. sounds like your all set now. :jamout:

 

[Filabob1]

Way to get jkelt fixed up freddy :resp:

 

[jkelt]

Thanks for your help freddy! Ready to rock n roll. Now I just need free time to go tear around!

 

[Core]

just an update...
i removed the 7955tg and the twitching stopped. did you keep yours in jkelt or did you remove it from your truck ?

 

[jkelt]

I ended up leaving it in and upgraded to the 6 volt hump pack. That solved it for me. Really glad b/c the 7955 servo is awesome!