Are Zippy Lipos safe with a Castle MMM Speedy?

[skellyo]

Originally Posted by fastbaja5b

Even Traxxas tell you to gear up when going from a 2s to a 3s Lipo

Nope, they actually recommend you gear down for 6S. That's the opposite of the HPI manual. Here's the BL E-Revo gearing chart:
http://www.traxxas.com/PDF-Library/5...anual_addm.pdf

[fastbaja5b]

But take a look at the manuals for the Stampede, Rustler and Bandit VXL's!

And that chart tells you to gear down from stock for a 4s, but I don't see any mention of 6s on there

[lincpimp]

Originally Posted by fastbaja5b

But take a look at the manuals for the Stampede, Rustler and Bandit VXL's!

And that chart tells you to gear down from stock for a 4s, but I don't see any mention of 6s on there

A vxl esc cannot do 4s, IIRC... 3s max.

[pasan]

Originally Posted by lincpimp

A vxl esc cannot do 4s, IIRC... 3s max.

Some people have reported running a VXL on 4S and 12 cells with the BEC disabled and cooling fan. But of course that would be voiding Traxxas warranty.

[fastbaja5b]

No I mean the e-revo post refers to a 4s set up using the MMM set up, what I meant was the VXL Manuals saying gear up from 2s to 3s (same principle which contradicts what is said here re - gearing down on more volts to lower temps)

example:



But I know a lot of people run a VXL on stock gearing with 3s and it's fine.

What we are being told here on the Savage Flux is essentially the 20t Flux pinion is for 4s, we MUST run the 25t pinion on 6s otherwise it could blow the ESC, it's happened on a Maxcramps pack http://www.ausrc.com/forum/showthread.php?t=15868 and apparantly on a Zippy as well http://www.rctech.net/forum/electric...os-smoked.html . (Could just be a faulty component but in the case of the Flux blowing they are pointing the finger at people running the 20t pinion and not the 25t)

Now doesn't that sort of contradict the whole premise of gear down, volt up = cooler system???

[sikeston34m]

Originally Posted by fastbaja5b

example:

With this chart, please keep in mind the discharge capabilities of the batteries.

Nimh can NOT and will NOT carry a huge amp load. Top of the line Nimh packs just won't keep up with what quality lipos can do.

[skellyo]

Originally Posted by fastbaja5b

What we are being told here on the Savage Flux is essentially the 20t Flux pinion is for 4s, we MUST run the 25t pinion on 6s otherwise it could blow the ESC, it's happened on a Maxcramps pack http://www.ausrc.com/forum/showthread.php?t=15868 and apparantly on a Zippy as well http://www.rctech.net/forum/electric...os-smoked.html . (Could just be a faulty component but in the case of the Flux blowing they are pointing the finger at people running the 20t pinion and not the 25t)

Now doesn't that sort of contradict the whole premise of gear down, volt up = cooler system???

This is a good question for Patrick to see what his thoughts are. I think most of us here agree that going to a smaller pinion on 6S is the more intelligent thing to do. Perhaps the HPI folks just don't have enough BL knowledge to understand that?

[johnrobholmes]

It is a typo in the manual. It happens, and this time it will cost HPI a ton of money.

[RC-Monster Mike]

Originally Posted by johnrobholmes

It is a typo in the manual. It happens, and this time it will cost HPI a ton of money.

My thoughts exactly. :)

[lincpimp]

Originally Posted by RC-Monster Mike

My thoughts exactly. :)

+1 on this... At least that is what I got when I read it.

[Arct1k]

Actually I'm not 100% sure as they do advertise it IIRC as 62mph out the box...

I think there should be some caveats to this though...

[lincpimp]

Originally Posted by Arct1k

Actually I'm not 100% sure as they do advertise it IIRC as 62mph out the box...

I think there should be some caveats to this though...

They list 62mph with the included 25t pinion and phatlines...

[skellyo]

Originally Posted by Arct1k

Actually I'm not 100% sure as they do advertise it IIRC as 62mph out the box...

I think there should be some caveats to this though...

Yes, there should be. For instance, running the stock tires on 6S with the 25T pinion should be a no-no.

Originally Posted by lincpimp

They list 62mph with the included 25t pinion and phatlines...

Yep, and the speed calc comes up with 62mph for it with a 25T pinion, 6S and Phaltlines, so it's probably pretty close to accurate.

[hoovhartid]

Originally Posted by lincpimp

They list 62mph with the included 25t pinion and phatlines...

that was my point in post #90....

I think that they didnt make it clear enough that when using the 25t pinion you need lighter tires than stock.

[RC-Monster Mike]

The manual DOES say that high quality batteries are required and lack thereof can result in failure. The gearing chart is off base, though.