parnelli97

iTrader: (6)

From what I read a mamba 5400 with the right lipo's and gearing is faster than the 7700, but there isn't any info on their site about the new 6900? Does anyone know which one is the fastest now?

c3fly

iTrader: (3)

The 5700 can be faster because you can use 3S LiPo with this motor which will create more speed than a 6900 or 7700. You will exceed the RPM limitation with 3S on a 6900 or 7700.

parnelli97

iTrader: (6)

Where did you find that info, because I can't find it anywhere on Castle's website. I was trying to find the cell limit on the 6900.

C_Suzuki

4600 5700 have a 3 cell limit and 6900 and 7700 have a 2cell limit

c3fly

iTrader: (3)

Here's one link about the 7700 - It talks more here about the limits. It only states the 4600 and 5700 are OK for 3S - This link also references the cut-off voltage settings for controlling punch and tourque -

parnelli97

iTrader: (6)

I've read all of that, but It looks like they haven't updated their tuning page with the new 6900 motor.

wrxnfx

iTrader: (30)

I've spoken with them directly about this and that is the correct information about the 2 cell limit on the 6900 & 7700. They told me that the physical limitations of the motors are about 60K to 70K RPM at which point the motor will literally start to self-destruct. I've owned both the 5400 & the 7700 and can tell you that the 7700 does put way more strain on all your components both drivetrain & electronics. If you're trying to decide which one to buy, take that into consideration, too. You will have more flexibility with the 5400, but it depends on whether you are willing to spend the money on both 2 & 3 cell lipos.