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Our Amp will be built with the RPM servo saver eliminator kit, a metal-geared, waterproof servo and an aluminum servo horn.
Many have posted about the RPM Servo-Saver Eliminator. I figured I'd do a more in depth look at the kit and install. RPM part# 73492 is the kit used for this install. It is done on an Amp MT, but the kit also fits the Boost, Ruckus, Circuit and Torment.
RPM Servo-Saver Eliminator Bellcrank
How to install the RPM Servo-Saver Eliminator Bellcrank in ECX AMP
The packaging:
View attachment 2028
I got this kit to alleviate vague steering as well as a large wobble when going in reverse.
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Here is the complete kit:
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To uninstall the ECX unit start by removing 6 screws. The below photo shows them, they hold the cover plate down.
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Next pop off the ball links on the servo arm and the two on the steering links.
Here is what the underside of that plate looks like. As well as the assembled RPM unit on the left. Two screws removed with the with the link between the two pivot points and the ECX unit comes out.
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Next is the assembly of the RPM unit. Their directions are below.
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Transfer over the ball studs, there are 3. A 7/32 socket is used for this.
You also need to transfer over this bushing:
View attachment 2033
One of my gripes about this kit is the plastic bushings. Lucky for us, the ECX unit has two metal bushings that are the exact same size as the RPM plastic bushings. So I promptly swapped those over. The two metal bushings are in the arm on the right.
View attachment 2034
Now the RPM unit is mounted to the steering cover plate using the 2 screws and link you removed earlier. Don't forget the washers under each pivot point between the plate and servo saver eliminator.
Reinstall the plate in the chassis and hook up the 3 ball links.
Thoughts about the RPM Steering Bellcrank
1. I don't care for the use of plastic bushings that we have to first deburr thanks to the parts tree removal. I will be going to bearings next but wanted to do a apples to apples comparison on this mod alone. The same goes for why I did not do a servo upgrade yet.
2. The RPM kit is quite smooth, but I believe the ECX setup was a little better. If tightened completely the RPM kit binds some. So some care is needed during install.
3. Performance wise, the steering is a bit sharper and I don't notice as much wobble. But.....
View attachment 2035
It's still there......
Hello again Amp fans,
With the RPM steering bell crank, what would be the proper way to free up the steering so that it has less resistance when disconnected from the servo arm? Cheers.
Hi Jerry,You just need to go through every joint, pivot, etc, one by one and find where it is binding...
Answer to my question..... Figured out myself. The angle bothered me, so I took a file to where the linkage hooks on and made sure it was filed straight. I filed down about 3mm. It is parallel now, perfect.What has everyone done with the linkage between the steering horn and RPM saver? No aftermarket?
There has to be something, OEM linkage attached, just does not align straight or parallel to the ground per say, it has a slight angle.
I am going to see if I can do a modification possibly between the two pieces (horn and saver).
Just seeing what everyone else has done.
So what about the following 3 parts all together:
73492 RPM servo saver eliminator
Metal geared servo ( 25t spline for example)
Metal servo horn ( 25t)
Would those 3 bits compliment eachother?
But he has no servo saver mentioned?
The Rpm Servo Saver ELIMINATOR is exactly what it says it is
Sorry, let me clarify.
I run the;
RPM Servo saver eliminator
*The RPM Servo-Saver Eliminator Bellcrank replaces the bellcranks and center-link from ECX1028. This system eliminates any form of servo-saver from the steering linkage. Most stock servos can become damaged if another form of servo-saver is not used.
Right from RPM site
Trackstar metal geared Servo
ECX Aluminum 25T horn
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