'Need 4 Speed (& traction)' Track specific board build thread. And ERL updates now :)

HV! Nice, and building the battery yourself I tip my hat off to you sir. Going to be insane. Why 16s? I don’t remember if you already said why.

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Man @Tasventouras has a nice box

Super excited for this upgrade, hoping you don’t have any dramas with the escs and keen to see how the extra voltage improves your track times!!!

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Because i have 205kv motors and already feel like I’m pushing the limits wirh 16s. I feel i will get hot motors very quickly.

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totally.

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I have 205kv too :grimacing:

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Yeah i know. Im surprised you’re getting away with it. Cooler weather perhaps?

What’s the hottest you’ve had them at 12s?

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95 degrees. My ESCs thermal throttle before my motors currently. So trying the raised box and heat sink on bottom for upgrade.

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Hmmm that’s already as hot as you wanna be getting :neutral_face: you should need less amps at 16s though. You were only marginally quicker to 30mph and I was only running 110 amps a side.

My motors don’t usually get above 50c t racing

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Maybe cool weather, I am starting to approach 90c with the latest settings lol.

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Those Reachers can handle more. @Tony_Stark said 100° start 115° end for cutoffs fine for those motors (correct me if I’m wrong).

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5 degrees and party is over though

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Yes but ive only got that hot on a hot day. Esc always throttles me first. Look i know it’s a possible problem but it is what it is. Can’t do much about it. If i get throttled I just hope I’m already out in front and i just need to hold a defensive line :crossed_fingers::crossed_fingers::crossed_fingers:

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Just set the cuts to 200 :sweat_smile:

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It was a daunting task taking on a 16s6p p45b battery build that must fit in and enclosure that only just squeezes in 96 cells single stack (especially as my only other battery build was a little 10s3p). Thankfully @glyphiks guided me through like a guide dog leading the blind! Thanks heaps for answering all my questions!!!

I definitely made some errors along the way, the biggest was cutting my nickel too big and it going too close to the edge of the cells thereby not leaving much room for unwanted potential shorts!! If i had more space to play with i would have really liked to squeeze a thin strip of rubber between the groups.





My soldering still needs work but even though the joins dont look the best they are strong. A good yank and holding well.

The BMS was a headache and i gave up trying to avoid crossing balance leads. The top of the pack is fairly well protected anyway as the height of bms id above all the cables so friction will be fairly non-existent with balance leads. I still used fish paper where there were cross overs just in case.


All i have left is the QS8 loop key then running off to xt90 plugs at each end.

I might get a chance to install over the weekend with new esc boxes and escs. :crossed_fingers: it all comes together ok.

There is a small chance the battery is still too long so i may need to do some enclosure trimming but I’m hopeful it will squeeze in.

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Finally ready to test ride after at least 20 hours of work!

I thought it would all come together fairly quickly after finishing the battery but nope!

I had all sorts of issues trying to get the D75 in front and D100s in rear to play nicely. The D75 is original batch with custom FW 5.03. There is no 6.02 available so I have no other option but to use FW 5.03 on D100s as well.

Many, many motor detections, swapping remote recievers around, mucking around with Bluetooth and various versions of vesctool, bugging an Australian builders telegram group and SRB riders telegram group for help. It was a major headache.

In the end it all came together using the latest vesctool on PC, plugging usb into the non-switch side of the D100s, doing a motor detection of all 4 motors over canbus, doing input setup with remote reciever plugged into the non-switch side and having no metr attached (metr module died at some point mucking around with various combinations).

D75 power button functions correctly. D100s only turns on but I have a QS8 loop key so doesn’t bother me too much. I’ve tried changing app setting on the switch side of ESC to ‘turn off after 30’, ensuring the other side is ‘always on’. The change of app setting never sticks.

I am very pleased with the new ESC enclosures. Bonnet scoop with a mesh opening at rear for plenty of air flow. Boxes are raised off deck with aluminum baseplate so acts as a heatsink as thermal tape used to adhere esc to plate.




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Boxes look mint! Looking forward to seeing how it goes on the big track at the end of this month

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ERL are doing a documentary on their Racing League. It’s a pretty cool process to be part of. Here’s a snippet of me from the doco.

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Went out last night to test the new setup and didn’t die so that’s a positive. My board didn’t catch on fire and I didn’t crash so win win!

I had a few front motor screams and cutouts after several laps of T racing so I’m thinking when things get warm something isnt’t happy. Overall I was pleased with the first test run as I was hitting mid 13’s on T racing with my 22/78 gearing (about 80kph) and zero throttle expo. I think once I change to 18/78 and bump up throttle expo this thing will be hard to manage!

Next upgrade to get the second D100s in the front and upgrade to 6.02 so I can use bluetooth app without stuffing everything up. Hopefully I can get the bloody power switches to work properly then too.

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How were your motor temps?