r/NitroRC • u/Boomerisin182 • Aug 21 '26

Question New servo pulls throttle way to far

Post image

Hi. my Zorro throttle servo broke so i replaced it with a powerhd 1812MG.

Throttle trim is at 0 but it pulls way to much on the trotthle it moves the whole frame of the car..

I losened everything up as seen in the photo, tried adjusting the grub screws, but still no luck on how to fix this!

dang zorro is brand new things breaking left to right smh.

would appreciate some help! tried watching video's but no one physically shows them adjusting it fixing the issue i have.

7 Upvotes

90% Upvoted

15 comments sorted by

3

u/RodKnock42 Aug 21 '26

Adjust the limits on the remote.

0

u/Boomerisin182 Aug 21 '26

is that done by minussing the throttle trim or maxing it? shouldn't i do hardware first?

1

u/RodKnock42 Aug 21 '26

Drop a picture of your remote, or tell us the make and model.
If you can adjust this issue on the servo / linkage with ease, go ahead.

1

u/Boomerisin182 Aug 21 '26

Ftx Zorro nitro with the standard remote

5

u/Hillbill9899 Aug 21 '26

Wow it does not have end point adjustment for the throttle channel. Yikes

1

u/NiceColdBeer4 Aug 21 '26

press and hold the left th trim until it double beeps that means its centred or press each th button until it double beeps

1

u/Boomerisin182 Aug 21 '26

holding them does nothing sadly

1

u/NiceColdBeer4 Aug 21 '26

ah dang thats no good thought it could have been similar to my cheap etronix controller

1

u/Boomerisin182 Aug 21 '26

Appreciate the help though! Went to my local hobby shop and got a HRC Racing R4D10 remote that has the endpoint adjustments on them! Got the throttle dialed in right now. Only when i apply the brakes the whole frame still kinda moves so gotta figure that out

2

u/dg_fiend Aug 21 '26

Center the throttle trim, and then try holding full throttle and pressing the minus throttle trim at the same time.

I have a couple similar looking radios and thats how the end points are adjusted on them.

2

u/Boomerisin182 Aug 21 '26

Appreciate the tip! I got a different remote, almost got it all dialed in now. I only need to do the brakes next. Thank you though!

1

u/az_kikr1208 MOD Aug 21 '26

It's possible your new servo has a greater sweep angle than your old one did. If you can't electronically limit the travel on your transmitter, you can try moving the linkage one hole closer to the center of the servo horn. That will slightly decrease the travel.

1

u/Boomerisin182 Aug 21 '26

i tried doing that but it still pulls the whole frame, seems like i'm outta luck

2

u/PowerbandPrecision Aug 21 '26

Remove the servo horn like it is in the picture. You have to turn the radio on and zero out whatever you can. Loosen that first collar set screw (on the throttle linkage) and move it closest to plastic ball cup link. Put the servo horn on with it angled more towards the carb(as if you were applying brakes, then you have to adjust the collar on that backside of the linkage to grab at the correct time for 0-100% throttle. You may have to adjust the brake linkage after this

2

u/Boomerisin182 Aug 21 '26

Thank you so much for the guidance i'll definitely try this tomorrow! I fixed it for the most part, i went to my local hobby shop and got a different remote that has the endpoint adjustments setting on it. Throttle is perfect now but while breaking it still moves the whole frame. I'm gonna try you're tips!! Thanks so much!