Monsters and drag racing
 

Changed over to MMMs from my trusted MMs in my 3S Top Fuel Dragster and 3S Top Fuel Funny Car. I had no idea that there would be a noticeable difference. I am partly correct, except that there is a slight improvement which was noticeable for me.

Here's the numbers from my Dragster:

http://i256.photobucket.com/albums/h...40133Small.jpg

http://i256.photobucket.com/albums/h...40132Small.jpg

http://i256.photobucket.com/albums/h...40131Small.jpg

These were consecutive passes in an open track session after racing today and I was impressed that the changes I made in the ESCs were directly translated to improvements in the numbers. The MM was not that clear cut for me.

Here's from my Funny Car:

http://i256.photobucket.com/albums/h...40134Small.jpg

http://i256.photobucket.com/albums/h...40135Small.jpg

Couldn't do much here since I ran out of tires to test with.

Thanks to CC for putting out great RC electronics at a price point that's light on the wallet (every bit helps right?). I will be getting another 2 MMMs to replace MMs in my other rides as soon as the budget allows. I wonder if I can trade my MMs in for MMMs since I will have 4 lying around after the upgrades.

Any comparison pics? or times?

Can you elaborate? I think the time slips I posted above explains it pretty much :yes:

Just trying to see how big of a difference in times.

I was looking for what you see above. Every small gain helps and it's nice when they happen as planned.

Good to see a 1.3 there Sunny. The MMM does flow more current than the MM, especially at burst. This is where you see the difference. Are you going to take out the heatsink as some other people do? Every little bit of weight loss makes a difference.

Thanks Romano. Yes, I like the way the MMMs flow more amps and yes those are the best off-the-line and mid track numbers I've seen in my rail too. I would like to take the fan, case and heat sink off them but kinda skittish about separating the heat sink from the FETs/board. But I'm OK with running at this weight. The cars seem to like being a little bit on the porky side: funny car is at 48oz and rail is at 45oz. Gonna keep it like this till the gains top out and then I will think about cutting weight.

The MMM heat sink is much like the Sidewinders, you could just clip off the the posts with qaulity nippers and finish w/a dremel sanding drum ?

Not a good idea to sand the aluminum down and potentially get conductive dust on the PCB....

More words of wisdom from the almighty King of Brushless !

Thanks for the words of wisdom Patrick. I'm planning on keeping things the way they are with the MMMs. Thanks for putting out such a great product. This was just the first day of running with MMMs for me. The MMs did fine while I learned the basics and the MMM is turning out to be a great upgrade already.

Since you are using these for drag racing and I would assume there is time between runs and the runs are short I would think that removing the fan and the top of the case wouldn't be to harmful, other than voiding the warranty. I doubt your gonna heat up the esc to 160*+ in 1.4 seconds, and even if you did your not maintaning it for any prolonged time so the fan would essentially be useless, and removing the top of the case would allow the heat to disipate more easily after the run while it's sitting in the pits.

I would guess that the times are quicker with the MMM for two main reasons:

1. The MMM has a little lower resistance than the MM, so currents to the motor will be higher (and thus, more torque).

2. The MMM has a more sophisticated back-EMF circuit and a faster processor, and can lock timing earlier than the MM. (and thus, higher torque earlier...)

So what if any advantages could be had using the MMpro over the MMM. Obviously understanding the MMM is capable of more power. Also I would be noting sensorless vs sensorless running the same theoretical motor since the MMM cannot run sensored.

The mmpro is good when using the cheat mode. Extra 100 watts of power with ease. Higher rollout startups are achievable with the MMpro as well. Smartsense is usefull here.

Thanks snell! I was just curious what the MMpro had over the MMM.

The MMM still has more off the line power over the MMpro, which is a big plus with the fast guys.

Yes, that makes sense. I also love the 10AWG battery wires, which also lend to lower resistance compared to the 13AWG wires on the MMs. I now use 10AWG wires on the motor side as well. Thanks again Patrick.

BTW, YGPM Patrick.

I have found (through trial) that the MMPro is not suitable for pro class drag racing, which is what I primarily participate in. By pro class I mean non-index (bracket included) "heads-up" racing. However, the MMPro is a favorite in index and bracket classes around the country.

As a side note, the fastest 6ft time that I'd personally witnessed was by Todd Commons from Australia with his 6S Extreme Class Dragster when he came to race in San Antonio for last year's Worlds. It was 0.177s and I believe his ET was 1.26s. My best 6ft from last weekend was 0.186s which is only 0.011 off from Todd's. I shudder to think what my ET's would be on 3S whenever I sought out traction issues on the big end. Todd also uses MMMs in his rides.

I know Im a few days old on this conversation but I have to disagree with the mmp statement Sunny. I ran my mmp 2s setup today with a sensored motor and I was very impressed. I made back to back run with minimum changes because I want to see how consistent it was. 1.64, 1.63, 1.61, 1.67 and 1.60. Fastest mph being 89.7 and slowest 81. I think this esc is great in the pro classes. I also use it in my funnycar and best et so far with it has been 1.430 @ 101. The problems I was having before went away after adding 2 caps. I dont know if caps solved the problem or if I changed something else but that was the noticeable thing. I guess its all in the setup. I like the mmm but I've been more consistent with the pro.

I think I should said it another way. I meant to say sensored set-ups don't do it for me in pro classes.

Another update from this past weekend with my dragster:

http://i256.photobucket.com/albums/h...40136Small.jpg

Still the fastest Top Fuel in Texas :whip:

You need to do something about the reaction tie .42 to .59... but you had a much faster setup... :)

Thats a heck of a 6' time man.. Nice run :yes:

Yeah, I knew it going in so I made sure I didn't red-light and throw the race away :intello:

Thanks man. Yeah, I'm liking this new set-up :yes: Gonna try something next time out to get the mph a little higher and should also get the ET lower if my number-crunching serves me well.

sleeping at the line :)

Car is flying!

It's all good as long as I get the win light :lol:

True story, till you run .02 over and were .03 later at the start :)

Used to Jr. Dragrace.. hated losing on the holeshot.

Yeah, but I kinda knew that I had the faster car by a long shot on that race so I just relaxed and waited for that last yellow to fully light up and Ka-BOOM... off she went. I think I had already caught up to him before mid-track.

Edit: here's the final against the guy who TQ'd with a 1.393 (I'm on the left lane)

http://i256.photobucket.com/albums/h...40138Small.jpg

Thanks to ifloyd for this photo-sequence of the TF final, which the above time slip is from.

http://i256.photobucket.com/albums/h..._0556Small.jpg

http://i256.photobucket.com/albums/h..._0557Small.jpg

http://i256.photobucket.com/albums/h..._0558Small.jpg

http://i256.photobucket.com/albums/h..._0559Small.jpg

http://i256.photobucket.com/albums/h..._0560Small.jpg

SA track looks nice and sticky Sunny.

Wow, very consistent end of track speeds too. Nice hookup. :)

Just did the calculation...

Acceleration is 3.2G average over the whole course. Too bad it doesn't show mid speed -- it would be interesting to see acceleration for the first 1/2 of the track.

Note that Top Fuel dragsters average about the same acceleration (and the world record run was at approx 3.4G.) Top fuelers are considered the fastest accelerating manned vehicles in the world...

How cool is it that an electric scale model performs almost exactly on par with fuel powered full-scale?

Wow.. Being that I dragrace 1:1 cars, thats awesome to know. Now only if we could strap someone to it lol.

Thanks Patrick!

That's too cool! Just based on visual observation, my car seems to pull harder in the earlier stages and the seems to top out a little before the finish line. Too bad nobody includes a mid track mph sensor with the timing systems available these days to record the speed. I for one would love to know how the acceleration is over the course of the run.

That is really freaking cool when put into that light! So it's true scale all the way across.

[QUOTE=Still the fastest Top Fuel in Texas :whip:[/QUOTE]

Dont look in the mirror Sunny I can see you.

Video of the 1.375 pass thanks to Kevin and John of Schneider Racing, SATX.

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:sarcastic: LOL Just kidding bro, I have enough tire left to make one maybe 2 runs on Sat. hope to better 1.39. Was looking around to to get my 2" rims ready to glue foam but cant find one rim so i guess I am just going to make 2 sets of 2" for now.

Nah, not a reply to your post man. John just uploaded that to YT and I just linked it here.

Besides, when you clear 1.39, I should be in the 1.2s :na:..... :lol:

PS: I should have enough 2" wheels for both of us.

LOL,Whatever!!!! I wasnt going to take the car on Sat. I was just going to bracket race but I might just take it to make a hit or 2.lol

You should. Go after the numbers man.