I was looking on their site and found this:
<table cellspacing="1" cellpadding="1" bordercolor="#000000" border="1" bgcolor="#ffffff" width="100%" heihgt=""> <tbody> <tr> <td> <p align="center"><font face="Arial" color="#555555">8.5T/S</font></p> </td> <td> <p align="center"><font face="Arial" color="#555555">4000</font></p> </td> <td> <p align="center"><font face="Arial" color="#555555">35.8</font></p> </td> <td> <p align="center"><font face="Arial" color="#555555">52.5</font></p> </td> <td> <p align="center"><font face="Arial" color="#555555">3.17</font></p> </td> <td> <p align="center"><font face="Arial" color="#555555">15</font></p> </td> <td> <p align="center"><font face="Arial" color="#555555">165</font></p> </td> <td><font face="Arial" color="#555555">=stock 19T, fixed timing</font></td> </tr> </tbody></table>does that mean there 8.5t BL equals a 19t brushed?
So how about running this setup on a 11.1vlipo think it can handle it on a 35a esc or go for a 60a esc

anyone?

they go by how many rpm's per volt , so at 7.2v its equivelent to a 19 turn mod motor. and no if this is for the ez run you will need the 60 amp esc as you dont want a esc to draw more than 80% capacity , so there is room for amp spikes if the tires bind up.... but thats just me. you can also use ohms law to get you amp answers watt answers and volt answers
http://www.the12volt.com/ohm/ohmslaw.asp

sorry forgot to add
warning math

so how would i calculate it at 8.4 and or 11.1. can u give an example.

The 60 amp ESC will struggle to handle a 4000kv 540 sized motor.

at 7.2 or 11.1? or doesnt matter?why would they sell it as a combo then?
what it will over heat?

Well, that depends.

Many manufacturers don't advertise the watt and amp ratings of their motors. However, Novak and LRP do. Anything in the range of 4000KV from those companies is rated around 200-300 watts (300 watts being the high end I could find in a 4000KV motor, most were much closer to 200 watts, one was actually 180). Even at 300 watts at 7.4 volts (2S Li-Po) that is only 40 amps. So assuming you use the motor in a application (with the correct gearing) to stay within it's rated parameters, the 60Amp speed control would technically have no problem.

Many people push gearing and temps pretty far, so I suppose the more head room you have the better, but there is too much in play to make a general statement that a 60 Amp speed control would have trouble with a 4000KV 540 motor.

Also, I recently checked the amp draw of my Novak Havok 8.5 turn (5000KV) in my TC3 to make sure it wasn't drawing too hard for a Li-Po I wanted to use. I measured a peak of 30.45 amps at around 8 volts (fully charged 2S Li-Po). That's a 5000KV motor geared properly for the situation and the amperage falls well within the rating of a 60Amp ESC.

so what if u put 8.4 or 11.1v what would it be?

What would what be? Please be specific and I will try to answer the best I can.

My example above is general and non-specific (other than my TC3, and I can give details if you want). I was simply saying that if you stay within the recommended operating range of the motors I mentioned you wouldn't go above 60 amps.

When you increase voltage, if the load on the motor stays the same (gearing, tires, etc.) the amperage will increase. However, if this causes the amperage to go above the safe operating range of the motor then you are going to have to change something to reduce the load.

For example, in my TC3 I am running a stock spur (I don't know the tooth count off hand) a 22 tooth pinion and tires that honestly don't get the best traction (so they spin rather easily). If I used a 3S Li-Po, and kept everything the same (meaning the load on the motor stayed the same) the amperage draw would go up considerably. However, this may cause me to exceed the maximum wattage rating of the motor. If I geared down to reduce the load on the motor and was able to keep my wattage at 280 (the maximum rating of the motor) I would be drawing 25 amps (280 watts at 11.1 volts is 25 amps). Again, I'm not saying it would draw this much, I'm saying that assuming I could change the load to get a draw of 280 watts at 11.1 volts, that would be 25 amps. There is a chance I wouldn't be able to stay within my rated wattage at 11.1 volts.

I realize this is all confusing. Just remember that the load on the motor is the biggest factor in how much amperage it will pull. This is why using the right motor for the application and gearing it properly is so important.

There is no way to list a certain motor and say how much amperage it will draw at a specific voltage. To know this you would have to know the exact load on the motor (as well as motor specs that aren't always available). Since many factors can affect this (vehicle weight, tire size, tire compound, surface traction, drivetrain friction, etc., etc.) you can't simply say "it will draw this much".

I was basing my statement on the basic amp rating of similar motors..............a castle 4600 will pull around 60-70a fully loaded, and most others around the 4000kv range around 50-60 under full loads. I just wouldnt like to be on the edge of the limit..........esc's start shutting down at that point, and folks usually push the limits,i'd rather be safe if it were me, thats basically my point. Good luck wantboost!

fully loaded u mean fully geared etc?