Okay, almost done. Just the receiver needs to be placed somewhere and cables need to be tidied up.
Weight is 4240g now RTR with 8s 4000mAh Turnigy Heavy Duty Lipo made from two 4s Lipos.
ESC is about 250g with cables like on the photo, Motor is 960g, battery 950g. That makes the Powertrain about half the weight of the car and the motor about 1/4 the weight. Sounds like a good ratio to me :D
Gearing is a 32t Kershaw 8mm bore mod1 pinion with 36t Traxxas plastic spur. Theoretical speed with 3.7V per cell, 1130KV and the 97mm GRP tires should be 190kph or 118mph. What I don't like about the Kershaw pinion is that it's quite heavy with 47g, I hope I can use a lighter alternative later.
Springs are now +20% Traxxas springs with 70wt fron and 60wt oil in the rear. Needed one more preload clip in the rear, apart from that it feels about the same as the setup before with 3.6kg car weight, +10% springs and 60wt/50wt. We'll see how it goes.
Shimmed the front bearing carriers and replaced the inner and outer hinge-pins with 4mm pins from a Savage. Also installed the STRC steering. Now the front is almost slop-free.
Powered up the ESC for the first time (on a bench, no running yet). What's strange is the throttle calibration. There is no "calibration-sequence" (so that the ESC can learn the ms-values for the endpoints) you can only choose "Automatic" or fixed ms values in the software.
I am wondering how does the ESC determine this? I mean, when I apply half-throttle, the ESC has to know the ms values for neutral and for full-throttle, so that it can apply half throttle at a ms-value that is in the middle of these two values.
Determining the ms value for neutral is easy of course, it just needs to look at the value that is present after powering-up, but how does it know what the full-throttle ms-value is?
What's also strange is the throttle feel. When pulling the trigger a little, the motor starts, but then stops again, you have to pull it further to keep the motor running. Also, when pulling the throttle very slowly, the motor doesn't start at all, I can pull it (very slowly) fron neutral to full-throttle without any motor movement. Weird.
I hope that is just because it was with only 25% max. throttle setting in the ESC (for testing) and that it will be alright when driven on the street with 100% throttle setting. The Castle Controller was very nice in this regard, lots of settings regarding throttle feel and very good throttle response, controlling all the power was never an issue.
