[andrewc]

Hi all

Not a newbie to the sport, but I am to the BMAX4iii, so thought I'd put this in here and hope for more specific advice/experience than in electrics/1/10th off road.

Bought a used BMAX4iii before xmas, great chassis with everything on it, PSM upgrades, lightweight chassis, YZ rear end etc, all the gear. Rebuilt it completely, renewed all bearings etc, chassis rolls a treat, no bind anywhere.

Running indoors, sports hall (20c probably?) on a large 28x17 carpet track with jumps etc, 1066 Racing on FB if you want track pics for an example.

G-Force 160 ESC and 5.5 motor; I'm aware that's running a quick motor but struggled with thermal cut out ON MOTOR all day. Got thermal cut off set at 105c, can up it to 125c but that seems crazy hot??

MOTOR temps/set up from day, (ESC ran at under 60c all day) in brackets my thoughts...EVERY RUN ZERO BOOST ZERO TURBO ON ESC

Practice: geared 18/87, 10% drag brake, 0 timing on motor, thermal 109c at about 3.5 mins. (Figure this was under geared? Also G-force supplied motor at 20 degrees, and I've learned since they possibly don't like running low timing? It wasn't negative timing, I checked electronically, actually read 7 degrees at zero)

H1: geared 19/87, 5% drag brake, 20 timing on motor, ran the 5 minutes came in hot, 98c BUT no warm up/wind down lap. (better gearing? Timing? Drag brake?)

H2: geared 19/87, 0% drag brake, 20 timing on motor, 1 warm up lap, thermaled on 'wind down' lap after 5 mins, 108c (extra laps the problem?)

H3: geared 20/87, 0% drag brake, 20 timing on motor, 1 warm up lap, thermaled about 4 mins 40, 109c. (over geared?)

H4: geared 19/87, 0% drag brake, 10 timing on motor, 1 warm up lap, steering screw dropped out at 4 mins approx... was at 96c at that point. (obviously inconclusive but less timing might have helped?)

Apologies for so much info, just keen to get some answers...had a 6.5 in a B44.2 previously and never had heat issues on longer runs than this.

Could it be a duff motor? (brand new)
Temps are normal and I should suck it in/up the thermal cut off?!
Put a fan on motor? How much temp difference could this make? (I've noticed this on some EOS pics but not all...why would some need it and not others? G-Force known to run hot?)

I did have a very tight to chassis trim on shell but have opened rear up a little for airflow. Not keen on holes in shell...looks crap and want to be able to run on wet astro.

Ideally need to be able to run a couple of warm up laps and not be running the temp gauntlet. Any thoughts/experiences appreciated, Thank you.