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Originally Posted by t-maxxracer32
motor braking? what is that? how much slower will a 9xl be compared to an 8xl?
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You do have plans to stop the truck don't you? :);) I don't see man brakes in there, so you will have to stop w/ the motor. The tranny will freespin due to clutch/oneway bearing if its not locked.
BrianG's Speed calc A 9XL on 6S A123 is faster than a 8XL on 5S A123. I'm not a quark expert, but I believe I've read they will run 6S A123 (22.2V), but 6S lipos (25.2V) are teh trouble spot. I'd personally go with 6S A123 w/ a 10Xl over a 5S A123/ 8XL if you are considering 6S an option. Speeds should be close, but the former will be cooler and give better runtime (but weight is more obviously.)