lost 5 mph from switching esc

I decided to go ahead and set my new MM up to pair with my Medusa 36-60-2000for some runs.Added a cap,bec,fan.Geared the same I lost 5 mph from where it ran with the Quark 80.I tried different settings on the esc,changed punch,motor timing,ect and could get no better performance.The quark was setup for max performance.It's now running at 39mph ,was about 44,interesting though 39 is what the calculator says it should be,yet with the Quark it was always faster then the calculator said.The only thing that made me unhappy with the Quark is it could not disapate heat fast enough from the internals.It has some heat mods done,but I did not pull a heatsink from the bottom fets.After about 10-15 minutes of hard driving it would thermal,but only for a couple seconds.The MM is running cool,but so much slower. I'm gonna slap the quark in later and do more runs,maybe the Erevo is just a little more beat up now. Anyway I found this really interesting,

[BrianG]

Did you just put the ESC in and run it, or did you recalibrate the radio to the ESC? The MM simply might not be seeing the full throttle signal.

The MM is basically the same as a Quark 125B internally (as far as the number and type of FETs used), so the MM should be faster if anything since it can pass more current than a Quark80.

To get the max output from the MM, it should have 0 punch control and timing set to at least "normal".

I calibrated it,then reset my endpoits to 120% and recalibrated.I to ,was surprised by this outcome as that was my understanding also.I'm repeaking my lipos now as they did have a little time on them,then I will try again.Then I'm gonna switch to 24/54-where I ran 52 with the Quark,and try it.Then Switch to the Quark ,and do it all again.Then maybe the MMM and try again.

And now.... ran again all peaked and got 39.4,How sad.So far temps have been no issues today as it is 60 this morning. Ran 54/24, which is what hit 52 with Quark,it hit 47.But the temps were still fine.Esc is definately running way cooler then Quark.

[BrianG]

Something is still up there. Unless the MM is not outputting the full voltage, changing ESCs should not affect speed appreciably.

By any chance, do you have the throttle channel reversed?

Also check solder joints. You'd think that the power lost would go somewhere.

I just changed back to the Quark and pulled 51 mph. No throttle channel reversed,all connectors are 5.5mm to motor and Deans to esc and batterys.I checked all of them and they feel firm.I have 1 2700uf 25v cap on my MM and 2 on the Quark.I know that I set the settings on the Quark for high power lipo.The power difference is pretty big.I now wonder, again,are the wires on the MM to small.The Quark has 12g and the mm 13g,small difference but in something thats trying to get all it can,the little things count.

[t-maxxracer32]

you wouldnt think that 1g difference will affect the speed by 10mph though.

[BrianG]

If the wires were too small, they would get warm from the voltage drop and high current. And, a drop of 5mph for a 2000kv motor would equate to a voltage drop of about 1.7v (assuming you're running 4s). That's a pretty huge drop from just wire and/or FET losses...

Hit 43 on 24/68 with the Quark.But rechecked all connections on the MM,they are fine.I'm ready to just call the Quark better.

Asheck, something's making me think about your epa on your radio.. You calibrated at 100, then again at 120.. maybe if you calibrate it at 100, then set the epa to 120, you'll have similar results as the quark? I've never really been sure how that works.. if you calibrate at 100%, but the tx's epa goes to 120%, would you be stressing the controller more than what it was made for?

Actually thats what I did.I had it calibrated,then tried moving it higher,no difference, then tried recalibrating agian to the higher setting,no difference.

[Takedown]

This happened to me aswell when I switched to a Jeti Advanced Car Sport from a MM. Their was a huge power decrease. I could pop wheelies with easy with the MM and the Jeti struggles. I also lost some top speed.

[Arct1k]

My guess is motor timing and maybe ESC switching effeciency... Odd though that you go from 39 MM 44 Q80 and 51 Q125...

Implies >25% more power with Q125 than MM with same setups...

Are you sure all batteries were fully charged for each run?

[bruce750i]

How about esc motor frequency differences???

Odd though that you go from 39 MM 44 Q80 and 51 Q125...

I'm only using 2 esc's the difference was the gearing.On MM 24/68 =39 24/54=47 Quark 24/68=43 24/54= 51 I was running against some nitros and got pissed that the Quark overheated.So I put my 350(Novak 4.5) back in.