meno1103

iTrader: (6)

Yes, I definitely think it would be a bad idea for those running high voltage packs, but for those having problems with 2s and a moderately strong servo (higher amp drain) it might be a temporary solution until they can find a better solution, such as one of the newer escs. I have been seeing higher voltage and amp ratings on various 1/8 scale esc, no doubt those changes will find their way to 1/10 scale soon. On my testing, I just hope to not experience any problems with higher amp loads, so I'll start with a single servo, then increase the amp load as I go.

Has anyone experienced an external bec failure where the bec did not damage other electronics? If so, what bec was it? It may be a better idea to change out the castle bec to one that does not run as high of a risk to other electronics.

turbo2cam

iTrader: (16)

My experiences with my son's car(s) and my own car(s) is that the savox/spektrum brownouts are indeed caused by the receiver. My son and I both run SPektrum DX3C radios. He runs a savox 1268 servo, I run a 1258 servo. Originally we started out both running SR300 receivers...both of us had brown out issues. I used glitch busters on both cars...and that worked well for a while. Then I noticed that whenever flysky radio's were on at the track, we would have to re-bind our radios (that may be an entirely different issue alltogether...but I'm not convinced) that worked most of the time.

Well then I started reading online that it was an issue with the SR300 receiver, So I bought us some SR200 receivers. I initially installed them with no glitch buster on both cars, and all was well. The weird thing though...after a couple months of running that way, my car, developed a glitch. re-binding would cure it for the night, but it would come back the next day, the next race, 2-3 races later....it was really random...so I put the glitch buster back on my car (my son's car still not running one with the SR200)

So then I start reading about people running DSM2 receivers and reporting that the glitch issues were completely eliminated...So I run off and buy a couple knock-off SR3100's to test this. I'm blown away! Not only is the glitching 100% gone, but I notice a faster response, and I also notice that the LED on the reciever is MUCH brighter on the SR3100 (even side by side with an SR200)...

So In short...I'm not sure WHY i got the results that I did....but it is FOR SURE the receiver that is causing or producing the glitch/brownout.

Now, I'm not saying the servo doesn't influence things...because when I was glitching with my car, and my sons car didnt....I swapped our receivers (both were SR200's at that time) and the glitch stayed with my car.....I swapped receivers back....and swapped my 1258 servo for my son's 1268 servo....the glitch FOLLOWED my 1258 servo.

So I would say the servo for sure contributes to the problem....but the SOLUTION was to replace the SR200/SR300 DSM receiver for the SR3100 DSM2 receiver.

Take my info for what its worth....just trying to help people understand whats going on.

ufoDziner

iTrader: (39)

It took a while to get her truck on the track, but here are the results from my wife's 22T with a Savox SC-1258TG powered by a Novak Havoc Pro SC X-Drive. The big gap is when I was taken out by another driver such that it popped out one of the power connectors to the ESC. After the graph is a vertically shot vid (she forgot that she can rotate her phone cam and have the video be correct) of me driving my wife's Mid-Motor 22T today.

+ YouTube Video

Dave H

Very interesting, if not somewhat perplexing. While there is a significant difference, it doesn't appear to match up with some of the other reported (but not as clearly documented) measurements. Wonder if there is any chance Savox has updated the servos, or have you had the servo in question for a while?

Can you export the data? I have data analysis software I use for full scale acquisition, nCode GyphWorks. If you were able to acquire comparable data with say a Futaba BLS servo it might be interesting to find out if I can see anything, say with a frequency spectrum check (or do you have that capability?)

In any event many thanks for your efforts in taking and sharing the data.

ufoDziner

iTrader: (39)

I agree. What I didn't expect is for the draw to be lower than my 2271SG. The 2271 is touted as efficient and low draw, and while it might be, it's more than the 1258TG. We've had the servo in my wife's truck for approx. 2yrs.

I don't see anywhere in the software that allows export other than to Google Earth. I'm happy to send you the eagletree file(s) if you like. Unfortunately the only tools I have are the eagletree, and a multimeter. I posted an open ended offer to test servos that anyeone sends me, but have yet to receive any offers.

kufman

iTrader: (6)

It isn't the average current that is the problem, it is the peak current which is hard to see with an Eagle tree system. When viewed on an o-scope, the peak current on a Savox servo is quite high, but the average is well below what the RX8 or the MMP are supposed to be able to supply. The ESC companies really need to work on their BEC's which can't supply nearly what they rate them for. I have dissected several ESC's and the chips used can put out 3A (for example) if they are at 25 degrees C. As you know, our ESC's are never at 25C and therefor that rating is rubbish. I don't see the receivers being the problem since I can't recall a nitro guy ever complaining about any servo causing a brown out.