Originally Posted by Stubbs

Randy,

I know it's probably been asked before, but I'm new to the e-buggy crowd (been running nitro for many years). I've got a couple of issues that I'd like your input on.

I've got an RX8-Gen 2 / 1900KV combo in my MBX-7 ECO (16/46 gearing). Ryan Lutz suggested I make the following changes to the base setup to get a smoother power delivery

Current limiter 65
Throttle Min 2
Brake Min 1
Drag Brake 5
Timing Advance 5
Change end RPM to 40,000
Then choose the start RPM that's close to 6000.

I tried that, but didn't like using drag brake, so I dropped that to zero. I also dropped the brake strength down quite a bit to prevent locking up the wheels.

Here's where I'm having concerns....

First, there are a few sections of my local track that require a quick on-off-on pull of the throttle. No brakes, just blips to clear certain jumps. I'm getting what almost feels like a short delay between the time I pull the trigger, and the corresponding acceleration from the car. I'm running a Futaba 4PK, so I doubt it's radio lag. It's also only in those certain sections where I'm having the problem. Could it be one of the settings that's causing the delay?
Actually it can be your radio and I bet in part it is. On the 4pk there's a setting that must be set from "BLS" to "normal" mode on the radio. I can't recall the page in the manual but look up "BLS" in your manual. ANY Esc should be on "normal" since Futaba chose to make "BLS" for their servos only. On top of that in the manual it clearly states that any
non bls servo should be set to normal." AND you should assure your throttle ratio is set to 70/30 on 50/50 which is default. Both of those settings are default actually: BLS On/ 50/50 ratio...silly I know for a competition radio.

Second, on an 80-85 deg. day my motor temp is generally between 175-190. When running the stock 14T pinion, my ESC wasn't even getting to 100 deg, but the motor was still around 175 - 185. I bumped up to the 16T, thinking I was just over-revving the motor. With 16/46 gearing, the motor still gets in that 185 average, and the ESC is around 110-115 after an 8 -10 minute race. I opened up a few holes on the body to get more air flow, but it didn't make much difference. My EPA is usually around 80%......are these temps OK? I considered dropping down to a 15T pinion, but like I said, motor temps have been about the same with a 14T and 16T.
Well you're defeating the purpose of gearing up if you're limiting the epa's to 80%. If that's the case drop to a 15T and put the epa's back to 100%. IF you can't squeeze 100% then you need to play with more current limiter or an even lower KV motor. Your motor temps are fine either way as long as you can make a full race pull (10 minutes) and it's under 190f.

Noithing is binding up in the drivetrain, and it may be fine. I just wanted to make sure I'm not running it too hot.