Are Zippy Lipos safe with a Castle MMM Speedy?

[fastbaja5b]

Originally Posted by lincpimp

Back to the OP, the zippy packs you mention will do fine IF YOU GEAR IT BACK DOWN SO IT DOES AROUND 45MPH ON 6S

PLEASE RE-READ WHAT I JUST TYPED, SAY IT ALOUD A FEW TIMES TILL IT SINKS IN. WITH STOCK GEARING THOSE ZIPPYS WILL GET HOT AND PUFF!

A 5000 20c lipo should be able to output around 100amps. That would not be enough for an 1/8 MT geared for 45mph on 4s, you need 150amps or more for 4s useage with that gearing. Now on 6s those cells should be fine.

Look at it this way, a 4s 5000 20c lipo can do 1480watts (theoretical max, no losses factored for this number) at 75% it can do 1110 watts, or 1.5hp, not enough for a 12lb truck with tall gearing.

A 6s 5000 20c lipo can do 2200watts, factor in about 75% effecientcy, and you have 1650 watts, or 2.2 hp. I would not run a MT on 6s with any cell spec'd lower than the 5000 20c you mention. Unless you plan to run 35mph, then you can run less capable cells (maybe even maxamps).

A 12lb truck doing 45mph uses some juice. A good rule of thumb, is 150amps for 4s 125 for 5s, and 100 for 6s. If you plan to squeeze out the 60+ mph claim on the flux, 2 polyquest 6000 25c 3s packs in series will be the best bet... 2500watts after losses, or 3.3hp...

Ok so I understand this yet here in Australia they are being told that ESC's are blowing as they are running the 20t pinion in a flux and not the 25t for 6s? I mean WTF? By your logic I should go down to a 14-15 pinion to lower the amps, by their logic I'll blow everything up!

What is increasingly frustrating is the lack of response to my direct questions on this matter by email to castle creations, there are more and more savage flux - ESC go boom - videos coming onto You Tube, yet I can't get any clarification on this matter, just a lot of theorising.

[lincpimp]

Originally Posted by fastbaja5b

Ok so I understand this yet here in Australia they are being told that ESC's are blowing as they are running the 20t pinion in a flux and not the 25t for 6s? I mean WTF? By your logic I should go down to a 14-15 pinion to lower the amps, by their logic I'll blow everything up!

What is increasingly frustrating is the lack of response to my direct questions on this matter by email to castle creations, there are more and more savage flux - ESC go boom - videos coming onto You Tube, yet I can't get any clarification on this matter, just a lot of theorising.

You can run smaller pinions, but you may find the motor undergeared, and it may run warm because of that. Otherwise it should be fine. If I were to buy a savage flux I would run 5s lipo and regear it to do around 42-45mph. That would most likely mean dropping 2 teeth on the pinion to a 23t. You can run it however you want, just take temps regularly and you will see what is not working. If you plan to run 6s, I would gear down a few teeth. Then keep an eye on the batts and if they get too hot you will need to drop a few more teeth. A MT on 6s that is geared for more than 55mph is generally a handful. That is why most of us gear for 45mph or so.

[skellyo]

Originally Posted by lincpimp

You can run smaller pinions, but you may find the motor undergeared, and it may run warm because of that. Otherwise it should be fine. If I were to buy a savage flux I would run 5s lipo and regear it to do around 42-45mph. That would most likely mean dropping 2 teeth on the pinion to a 23t. You can run it however you want, just take temps regularly and you will see what is not working. If you plan to run 6s, I would gear down a few teeth. Then keep an eye on the batts and if they get too hot you will need to drop a few more teeth. A MT on 6s that is geared for more than 55mph is generally a handful. That is why most of us gear for 45mph or so.

The Flux already does 41mph on 4S with a 20T pinion and a little tire ballooning. Going to 5S, you'll want to drop 2T-3T from the 20T to get back down in the mid 40mph range if you account for ballooning.