What? On what radio does adjusting to 150 EPA give you a physically longer throttle throw???

Jkas10,

Thank you for all the advise. I will follow it and do my best to track temps and not run until I hit the cutoff.

Rheal

If a capacitor fails on a VTX series speed control, what happens to the speed control?

I ask because I just recently has to speed controls shut down mid race in my 22sct and not restart. When the 1st one died I soldered in my spare, I reused the capacitor (http://www.shopviperrc.com/ProductDe...ode=6VSPCAP005). I'm going to try to solder in the old capacitor but I'm doubtful. The 1st speed control ran the capacitor for 3 months.

Any other things to brainstorm as to why the speed control might just die mid race? I'm going to toss the motor, just-in-case. The motor is almost a year old, no overheats though.

Edit: Makes me wish I purchased more then one VTX10r from the Black Friday deal.

Yes, the trigger only travels so far -- but if you increase the end point adjustment it changes how the esc will react to the every little application of the throttle. If the EPA is too high, it might make you feel like you have the pull the trigger more, to get a reaction from the motor. Conversely, if you lower it, it will feel like a "hairpin" trigger.

Exactly. At 150% calibration 1% is more like .75%.

Good Luck to everyone running Viper products this weekend at CRCRC Mid West Champs in OH. I spoke with a couple guys already getting set up and everything last night and this morning. Look around - JP Richards, Paul Sinclair, Bob Barry, Mark Samuelson and more!!!!

I have seen unit stop because the cap came off, I have seen other run. It shouldn't run if it comes off. Generally unless there is some other type of problem, a replacement can be solder on. Make sure to use the Viper capacitor for your unit. Cap sets from other speed controls may not have the proper values to use as a replacement.

Need some help with gearing with my Vtx10/17.5 setup. I am running a RC10 T4.2 with a FDR of 5.48 mid timing on end bell and blinky mode on esc. It had no pop. It felt flat and I really had to concentrate and keep momentum up. Track is a small indoor carpet with the fast guys running 17/18 second laps in their buggies.Motor was temping between 150 and 160.

Ok, question.
How many bits does the ESC sample the throttle signal at? And during calibration is full throttle on the tx (at whatever pwm full throttle on the tx is) mapped to the highest number of bits? ie, if it's 8 bit, is whatever is calibrated as full throttle equals 2^8?

Pumpkin, all signs point to you being over geared. Recommended FDR for 1/10th truck is 7.0 with 17.5. On carpet you could probably take that down into the 6is but I would start your gearing around 28/75. To give it
Even more "pop" turn off your deadband and adjust your throttle pwm down to around 4000.

At this point you are over geared so the motor can't spool up to its optimal RPM which is why you have less low end and high temps.

Building an SC10 4x4 right now. Will be running the Exotek chassis. The chassis weighs about 140g more then stock. Trying to decide on a motor and esc. I had a 4000kv Tekin Pro4 in my SCTE and hated it. It was too much torque and hard to control. I want something smoother. Race on a medium indoor track about 15 second laps. Trying to decide between:
VTX10R or VTX8
and
VST 4.5 XL or VST 5.0 L

I run a 7.5 wheeler and 8.5 in 2wd buggy. Just not interested in 4 pole. Thanks.

I would suggest the VTX8 ESC personally.

Standard 2 pole 550 motors in general feel like they have less torque than the 4 poles.

You may like one of those.

Hi guys,
I'm thinking of trying a VXT1 in my 1/12 scale.
Any feedback about the results you guys have been getting.
Question? I see the specs say up to 5.5v on the bec.
Is this true? Can it go higher?
My current speedy's spec says 6v.

Looks like a very nice speedy

Steve h

Steve,

VTX1 is 2 time and current defending ROAR National 1/12 17.5 class winner -- to mention performance possibilities.

Yes the SBEC is rated at 5.5v, would mean you might use slightly different dual rate or expo, wouldn't be a huge difference overall. I have used it in my 1/10 buggy and didn't notice difference between 5.5v and 6.0v from my VTX10.

chevmaro - I agree with Cain - VTX8 for anything 4wd SC. will run the VST XL motors easily. Using a VXT10R would be making it work at the maximum of its performance range, it could do it, but the VTX8 would be safer overall.

Chevmaro, I ran vtx10r with the 4.5xl for awhile with no issues however... really need to watch the temps because they can creep up depending how hard your running it (size of track and time of the race). I decided to take the worry of overheating and got the vtx8 and ran w/4.5xl. No issues and still quick with the right gear.