TomRawe

I have a RX8 1900kv combo and need help. It is running really alow and my slash 4x4 on 3s will smoke it. I am running a 4s battery with 16/46 gearing. I feel like it should be screaming and it barely spins the tires. I bought it used so i have never seen it run can anyone help? I am new to this site and just got back into the rc thing after about 12years.

EbbTide

iTrader: (39)

When you got it did you re-calibrate the ESC to your radio? If not, look at the manual online and do the process then retest it.

rskoncepts

iTrader: (37)

Hi TC3MIKE...If you considering using the RX8 for drags that is not a very popular choice. I've also tried it with not very satisfactory results. As Randy has said, the RS Pro Black is the go to. I also use the CC Monster (now the Monster X) for my 3s stuff.

Randy_Pike

iTrader: (6)

Pretty sure I answered this via email, the Rc8.2 correct? if so you're under geared by 4 teeth due to the 4.3 trans ratio

TomRawe

Yes Randy you did i ask on the here before i contacted you. Thank you for the quick response by the way. I ordered the pinions today will find out next week if that takes care of my issue. Thanks again.

grabbem88

iTrader: (1)

That’s odd I’m 17/46 and I’m popping wheelies and spinning tires

On enduro tires though

Randy_Pike

iTrader: (6)

Understand the the Rc8 series of cars went through an internal gear box ratio change at one point. The latest version is 3.31 like many 1/8 cars, whereas the older models was 4.30 which is a 4 pinion tooth difference in FDR.

grabbem88

iTrader: (1)

Hmm forgot about that and mine is only a couple years old too

I was thinking he had it at 50% or something

RookieRacer00

iTrader: (2)

I had the same issue. Tekin had me hold down both buttons on the ESC for 5 seconds to reset it...Problem solved. Apparently, the ESC was in brushed mode. Resetting made it detect a brushless motor.

TonysRacing

Randy_Pike

iTrader: (6)

what car is this?

fredygump

iTrader: (1)

I just had 2 rotors grenade on me, and I'm trying to figure out why.

I'm running a 4038 1350kv on 6S on a MBX7TR. On the first (original) rotor, the fiberglass wrapped around the magnets broke straight across, like it was cut along the edge of one of the magnets. The magnets came out completely intact, not broken. All 4 magnets separated from the rotor core, which came out by itself, leaving the magnets stuck to the inside of the can.

I wanted to keep running my truggy, so I pulled the rotor out of my 4038 2000kv motor in and put it in the 1350kv.

Now it's the next weekend, and half way through the third pack since the rotor swap, that rotor grenaded. This second rotor had a different failure. One of the magnets cracked toward the back of the motor. It looks like there was some rubbing, but I don't know if that caused the failure, or if it happened because of the failure. It looked fine when I installed it.

I don't see anything obviously wrong with the second rotor when I installed it. And the bearings look fine.

I'm running an RX8 ESC, with torque set to 1. I was using a 15T pinion at the time, but had run a 16T on the previous run. Motor temps ended at 180F, so I went back down 1 tooth. I ran the 15T last year.

So yeah, what's the most likely issue? Is something wrong with my motor, or is it somehow set-up related? Should I be geared higher, despite the motor temps?

I ordered 2 new rotors last week, thinking I'd have a spare (out of stock... ), but at this point I'm hesitant to install a new rotor in the motor. I don't want to ruin another rotor if this is going to happen again.

Randy_Pike

iTrader: (6)

I would recommend giving the inside of the can a thorough inspection for debris. There's not a ton of air gap in between the rotor and the stator. If a rock or debris gets between the two, it can cut/destroy the kevlar wrap. The wrap doesn't really hold the magnet segments to the shaft, but is back up in case the segments fail for whatever reason. How old are these?

We have recently updated the rotor to improve reliability and have "locked" the segments with a ring. This prevents the segments from coming off at all.

carpetburner

iTrader: (8)

I would like to hook up a wtf windy trumpet fan to the fan port . The fan pulls .48 amps and I am wondering if that port on the esc is able to handle that amp draw .

Randy_Pike

iTrader: (6)

Should be fine. What's the fan for?