190 degrees is certainly a bit on the warm side. What battery are you running?

you're overgeared try a 13T or 14T pinion.

He's maybe one tooth over geared.

The T8i is sensitive to gearing and if you're on a "medium" sized track you're over geared at 16T. Go 15T.

190 after a full run is ok temp wise but I'd wager dropping the tooth will help.

Something that may need to be clarified going forward now that we can see internal motor temps in the log... was it 190° on the outside or inside? I knew the temps iniside would be higher but it seems to be about 50° higher, more than I thought it would be (4x SC)

Maybe not related to old carpet, but previously we always talked about outside of the can temps, now someone may be talking about inside temps that are really high with their setup and gearing correct or at least close leaving everyone scratching their heads.

Thanks for responding everyone, I apologize for the delayed response. The temp is an outside the can. My lipo is a protek 4s 100c 4300mah. I was running 15/43 and temps were 173 after 12min. I want to stay with a 4s, thinking about trying the SMC 4s shorty. I heard good things, I think it's a 70c 4600mah. I will go down to 15 on the pinion, I was running everyone down on the straight.

As Randy and Nick stated earlier, drop a tooth on the pinion. If your using most of that 4300 up in that 12 minutes that will definitely cause temps to rise as well when the voltage drops near cutoff.

Ok cool, I will drop a tooth. I believe I was at about 35% left. I thought it was ok!?

Just a thaught for everyone awaiting the app. You may want to look into getting a cable to connect your phone to your hotwire. My s4 requires a micro usb to mini usb (hotwire). I had to order it on Amazon cause I couldn't find it in any local stores.... It would suck to download the app only to find out that you can't use it till you get a cable.

I'm new to electric and decided to go with tekin gen2 what motor do you recommend for 1/8 buggy I would like smooth usable power I have a trakpower 4s 6800 70c lipo

Gen2 T8 1900 or the 2050 if you want a little extra punch.

SCT PRO4 4300HD

Do I need the fan?

Cant use search feature on this device. .

Thanks

Fans are inexpensive insurance. With your motor I would recommend getting one.

Click the search this thread link then click advanced, that should work. Google is better at finding things in rctech than rctech's search function.
I don't run the HD motor so I can't say but in general if your having heat issues with the motor, use a heatsink. If you gear to max temp with a fan and the fan fails you are running a lot hotter than you wanted and won't know till you pull off the track.
If your talking about the ESC fan, 2 cell short course, probably needed. You can try without and if you thermal, put the fan in.

Very good point.

Pretty much always need a fan in Pro4 as they are 2S setups and pull more current than the 4S 1/8 setups.