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Steering servo for my HPI Nitro MT

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Steering servo for my HPI Nitro MT

Old 09-01-2004, 10:06 PM
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Default Steering servo for my HPI Nitro MT

Im looking at a better steering servo for my HPI MT 4x4 stadium truck. I have 2 trucks 1 set up for on road with the 2 speed tranny and another setup for off road with a racing clutch, racing 5.5mm carb, HPI blue hard springs and 45 wgt shock oil. I just installed titanium tie rods on both trucks to replace the stock plastic and want to beef up my steering servos. the off road truck is using futaba s3003 for both servos and the on road is using a airtronics 94102.

What would be a min torq for steering on my ST's and what would be max speed. I was looking at a hitec 645MG in both trucks it would be more torque and faster but is it enough? Or should I go all the way up to the hitec HS-925MG. What will it take to get rid of the UPS like handling on my heavy ass 4x4 ST's? the 40 dollar 645MG or the 73 dollar 925MG?

Stats for all 4 servos in question are below, as well as one more question.

The stats on the s3003
SPECS: Speed: .23sec/60 deg @ 4.8V
.19 sec/60 deg @ 6V.
Torque: 44 oz/in @ 4.8V or 56.8 oz/in @ 6V
(3.2kg/cm @ 4.8V or 4.1kg/cm @ 6V)

The stats on the 94102
SPECS: .22 seconds/60 degrees (tower does not say if this is at 4.8 or 6v)
Torque: 50 oz/in

The stats on the 645MG
SPECS: Speed: 0.18sec/60 degrees at 4.8V
0.15sec/60 degrees at 6.0V
Torque: 5.5kg-cm (76.37 oz/in) at 4.8V
6.8kg-cm (94.43 oz/in) at 6.0V

The stats on the 925MG
SPECS: Transit time: 0.11 sec/ 60 deg. @ 4.8V (0.08 sec/ deg @ 6V)
Torque: 6kg/cm (83 oz/in) @ 4.8V (103 oz/in @ 6V)

Is it true any fm75mhz reciever will work for a fm75mhz transmitter? Reason being I have 2 radios and 2 recievers one is a Futaba 2PL 75mhz AM set, the other is an Airtronics MX3 FM set. I would like to get 1 more reciever and sell the other set. The Futaba reciever can be had for 25 but the airtronics reciever is gonna cost more like 70-80. I would rather keep the nice FM set but not at that price. I also have a 3rd electric truck my son drives so I need 2 more recievers to go down to 1 gun. Would any brand 2 ch 75mhz FM reciever with the right crystal work? Since I only use 2 channels in my trucks.

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