[Chequered Flag Racing]

Catch-Fire's got @ 7700KV but he had in the slower motor in from Sat night's racing

Put loads of lead in the front to keep it earth bound but the bloody thing still wanted to fly

We read this 1st from the Mamba Site

Where are the “real” limits and what is the fastest?
In internal and beta testing, we were unable to find gearing options that would actually thermal the controller when used within spec:
Max input voltage for ESC: 3s lipo or 12 cell NiMH/NiCah
Max RPM for CM36s motors: 65,000 rpm
4600Kv motor max voltage: 4s
5700Kv motor max voltage: 3s
7700Kv motor max voltage: 2s
The Kv of a motor is the number of rpm’s it will turn per volt of input. So the 4600Kv motor will turn 4,600 rpm per volt of battery. On a 6 cell pack we can presume good cells are holding around 1v per cell, so 6v x 4600Kv = 27,600 motor rpm. If we use a 4s lipo pack, lipos carry about 3.5v per cell under load, so 3.5x 4 = 14v. And 14v x 4600Kv = 64,400 motor rpm . This is right at the top of the motor rpm limit and is OK, but is beyond the voltage limit spec of the ESC and cannot be used.
On the other hand, if we take a 3 cell lipo pack with the 7700Kv motor, that gives us 10.5v x 7700Kv = 80,850 motor rpm which is safe for the ESC, but well over the safe motor rpm limit so it cannot be used either.
So how can you get the most speed? You might think the 7700Kv motor having the highest Kv would automatically allow you to have the fastest setup right? Let’s find out:
7700Kv x 2 cell lipo voltage (max with this motor) = 53,900 motor rpm.
5700Kv x 3 cell lipo voltage (max for the motor and ESC) = 59,800 motor rpm
So the fastest 5700Kv motor setup is actually 6,000 motor rpm faster than the fastest allowable 7700Kv motor setup!
Now if you are racing with 6 cell packs only, then obviously the 7700Kv motor will be the fastest option for you, but we are routinely asked “what is the absolute fastest setup for my car/truck?” The answer in this case, is the 5700Kv motor with a high quality and high output 3 cell lipo pack made for 10th scale cars.
How fast will it actually go?
We are working on a speed chart, to show actual measured top speeds with 6 cells, 2s and 3s lipo packs in a variety of vehicles with “normal” or very conservative gearing. We have a confirmed measured speed of 62.4mph with a touring car on 3s lipo and the 5700 motor from one of our beta testers. From our best estimates, very near 60mph should be easily attainable in touring cars, as well as 2wd buggies and stadium trucks with the 5700 motor and 3s lipos.
On 6 cells:
4600 motor ~ 25mph
5700 motor ~ 35mph
7700 motor ~ 45mph
On 2s lipo:
4600 motor ~ 30mph
5700 motor ~ 40mph
7700 motor ~ 50mph
On 3s lipo:
4600 motor ~ 45mph
5700 motor ~ 60mph
Look for software updates with more tuning aids to totally dial in your Mamba Max for any driving situation being constantly added to our website, as well as additions to this tuning guide as we gather more user tips and experiences to pass along!
Now go pull the trigger and light em up!