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Old 21-02-2010
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Default Gearing?
Just wondering what the experianced guys may suggest for my LRP s8bxe team car? Its on an lrp 2800kv motor running 4s. Its as box I think, but thats not always the right way I'm finding. Thanks chaps. Also, could anyone point me in the right direction for connectors for my battery/speedo please? The battery has the big red one peice plug with what appears to be a male and female inside. Where can I purchase some more to get this show on the road/track, prefferably uk if poss. Thanks again.
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Old 21-02-2010
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EC5 connectors seem to be one of the best http://cgi.ebay.co.uk/EC5-battery-CO...item518fe71d9a

Got some from this person on ebay all good other day.

Looks to me like you have too high KV motor there for 4S? I read around 30,000rpm is the sweet spot 41,440rpm seems alot, 2000kv for 4S by my reckoning?
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Old 21-02-2010
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I would put 2800KV on 4S as a little high as well, but the LRP motors are a little underpowered in comparison with the Castle, Neu motors that we have based that hypothesis on, so maybe the LRPs like to run a little higher RPM.

According to the manual, for 2800KV on 4S, you want to run 11/44 gearing on an S8BXe (11T pinion, 44T spur). By my rather rapid (and probably wrong) calculations, the differentials in the S8BXe are at 14/49.

According to my calculations, that comes out at about 48 mph including tyre ballooning (using the same methods and constants as I always do when calculating gearing), which is a touch high. I'd suggest bringing the pinion down to a 10T for 44 mph, or a 48T spur with the 11T pinion (preferred, as the teeth won't wear as quickly).
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Old 21-02-2010
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Oh yes, and I'd also go with EC5s, like BRS suggested - I've been using them a long time now.

The trouble with the 'red plugs' you speak of is that there are so many slightly different types, whilst an EC5 (even a copy EC5) is still an EC5 - in the same way as all Deans work together technically.
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Old 21-02-2010
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Mint. Cheers fellas. I appreciate the info. I'll get the parts ordered tomorrow.
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Old 27-02-2010
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Just looked at the car and its actually on a 13t pinion with a 44t spur! Crikey. Overgeared???
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