I have a MMP powering a Viper 5.5XL in a SSC slash 4x4. Static timing is set at 17*. Any recommendation for CHEAT timing? Truck is strictly a basher, running on 2s.

I think my vtx8 is toast. I was at the track, going down a straight and it just stopped, no steering or throttle . Walked out to it and pulled the body and the vport lights were going crazy. I was not able to turn off the esc using the vport, so I pulled the battery and set the truck aside for a while.

The esc will arm fine, everything looks normal. However, instead of profile 5 (my custom), it boots in profile 1. If I hold down the vport button, I can access programming mode. One in programming mode, my provable can access the tuning. But, I cannot change the profile setting on the esc. As soon as I hit the button to change the profile, it reboots the esc into profile 1.

I adjusted profile 1 settings to match my custom and armed the esc. While holding the truck, I am able to rev the motor and I have steering. If I set the truck down, I have steering but the when I give it throttle it will shoot forward then stop and I lose steering and throttle control. Once this happens, the lights on the vport start dimming randomly and the fan will shut off. At this point I can no longer turn off the esc with the vport. If I unplug the battery and plug it back in, it arms as normal and works perfectly fine, until I set it on the ground.

I am at a loss as to what to do. Any thoughts?

Well I pulled the trigger on another VIPER VTX10 with a 7.5 FOR MEEE. lol my boy just loves them....He got TQ'd and got 2nd in the main in 2wd sc and got caught in a first turn wreck in his 2wd buggy and got back to 4th and was still movin up when a caster block broke, so he got 8th. im hoping with a little help from viper that I might find the back of his truck in the main next race LOL

Brian - did you order already? Why not 10r for the SCT? I only run the 10 in my buggy and 10r in the SCT and wheeler.

Just to rule out any weird things, rebind the radio to the receiver and then redo the esc setup. Not saying that will fix it, but it will rule out a set of variables.

Make sure the Radio is in normal speed mode too. Not high speed. Keep us updated on if it helps

Getting a new 17.5 for my b4 and was wondering if a rotor would help with power and which one torque or rpm? I race indoor clay 100x60 track

the stock rotor is 12.5mm It's already more torque than most of the other motors. They usually come with 12.3mm rotors. We do have a 12.3 and a 12.0 so you can fine tune for each track / layout. We also have a 12.8, which is even more torque.

Personally I ran the 12.5 (stock) rotor with 34/69 gearing when I ran the B4.2 Timing on the endbell is at 45 deg. ESC Settings 100% punch, 5000mhz pwm.

That is what I am running now, I was just looking to see if any other rotor would help in the power and speed. The gears and ESC settings is about what I am running. Just need to upgrade to the new firmware.

Well to be Honest I didn't see the need for the 10R in our sct and buggy...im sure we'll never run anything lower then the 7.5 motor and other then maybe a 1/10 scale 4x4 buggy i don't see the need...and as for if and when Brexton not me LOL runs 4x4sct well go with vtx8

Here we go again! VTX8/VST4.5XL in a SCTE 2.0 still shutting down! I am running profile 4 with no changes, 12 tooth pinion and the motor temp cut off is set at 230. Today it didn't have any problems during three qualifiers but in the eight minute main it shut down, again. This happens every week! I have tried turning down the punch, timing, different pinions and raising the motor temp cutoff. There is no binding in my drive train. I am out of ideas. This is the last shot for this set up. I am now know as the guy that always has problems. Any suggestions?

if you aren't running A55 firmware, you are only using about 60% of the total power. The jump that was made in A55 is nothing short of amazing.

Switched out receivers, rebound, re calibrated.

The system still arms and works fine. Light throttle works. A hard pull will stop the fan and I lose steering and throttle. After the lockout, the lights on the vport will flicker and as they flicker my servo (savox, super loud) will lightly try to center itself.

what's the motor temping when you cut off? And I mean what is it when you take a temp gun and hit it from the outside. If you aren't over 160, I would turn off the cut off temp. I've seen as much as 70 deg difference between internal and external temps.

Bob - I wasn't able to temp it right after it cut out because the race had to finish before I could get my truck back. After the qualifiers when it didn't temp out I saw 165 to 177 degrees outside temp. I ordered the pc link this morning. Is it possible I don't have the latest update in my vtx8 and that's the problem? Will loading the A55 update really make a difference? Thanks for your help!

A55 is the original firmware. A61 is the latest.

But If you've confirmed before that the motor is hitting only 160-170, turn the cutoff completely off.