One last look at my shopping cart
 

Well the 7xl are out of stock currently so Im going with an 8xl for the 9920 and power them with 5s.

Does the Li-Saver work with both 5 and 6s?

I have a reciever pack but do I need it for the 9920? It has "3Amp.BEC on/off Function". I dont know what that means. Will that alone provide 6.0v for my servo?

What gearing for a single speed tranny should I start with? Is 16 or 18/66 32p a good start?

You definitely need a receiver pack or UBEC for that cell count. You should be using one for anything over ~9v.

"3Amp.BEC on/off Function" means it has a built-in BEC, but it can be disabled via a jumper (the black one).

I'm sure others will answer your other questions...

The Li-Saver is supposed to auto sense between 2-12 cells. Most everyone on this forum recommends the use of BEC or receiver pack to help keep the ESC cool. As for gearing I again recommend using Brian G.'s calculator (the same link as the wiring diagram in my previous post) to start and see what speeds you are after. Hope that helps.

Ok, Li saver in combination with rx pack it is.

I diddnt understand the "gear calc" but I tinkerd with the "motor selector" and "Random Parameter Solver". Found that an 8xl with 5s and 18/54 gearing is "good" for a for a top speed of +/- 40mph, 20/54 for 45mph and 22/54 for 50mph without any overheating warnings.

Is it OK to use the Li-Saver with a car that is using reverse?
I ran into a problem with another brand of Li-Po cutoff device. Most are made for airplanes so when they do their "pulsing" they pulse down to near 0% throttle. 0% throttle on a car controller is full brake or full reverse if reverse is engaged. After coming to a complete stop it then went to full speed reverse. I really should have known better, but I guess the excitement of a new toy got to me.

Seeing a 8 pound buggy flying backwards down your driveway and into the iceplant at near 40MPH is quite alarming :026:
Perhaps the Li-Saver doesn't pulse below mid throttle (neutral for cars)?
Just thought I would bring this up.

Matt

the one that Mike sells will work good for you.

They have more than one version of the li saver.
It has a plane and car mode.
Mike sells the car mode one.
No worries on wide open reverse.

That is good to know. Since I switched to the Mamba Max, I don't need a LVC any more (I run 4S).

I just wanted to make sure the same thing didn't happen to rustnpede in case the Li-saver did the same thing. He might not have as much iceplant as me :005:

Sounds like he is good to go.

Thanks,
Matt

Like this one http://www.rc-monster.com/proddetail...avercar&cat=22

Thanks for looking out. No ice plant here just rocks, not so r/c friendly. Unless its a crawler:025: