New hi-speed project - Page 10 - RC-Monster Forums

BrianG · 03:23 PM

It just makes me nervouse to pull currents consistently that much higher than the rating. I was looking for a "solid" 100-120A continuous rating with higher bursts. The Jive 80A might be a better choice, if nothing but peace of mind. And since I'm not using electrical brakes, the proportional brake issue is not important.

What I'm looking for is an ESC with the following features (not necessarily in order of importance):

- 100-120A rating.
- 50v+ rating. I want to run about 15-20% under the max rating for reliability.
- Decent level of programmability.
- NO COGGING! Never had a setup that did, and don't want one now.
- Adequate heatsinking. I'm don't like temps above 130-140*F.
- Fast/easy domestic support/warranty service.
- No special signal translation devices needed (pistix)
- Adjustable LVC (can set the v/cell value). I like a 3.1v-3.2v/cell cutoff.
- Priced at $300-$400.
- High quality. I don't trust those ~$100 100A HV ESCs. If it seems too good to be true, it probably is.

lutach · 01.29.2008, 03:35 PM

Quote:

Originally Posted by BrianG

It just makes me nervouse to pull currents consistently that much higher than the rating. I was looking for a "solid" 100-120A continuous rating with higher bursts. The Jive 80A might be a better choice, if nothing but peace of mind. And since I'm not using electrical brakes, the proportional brake issue is not important.

What I'm looking for is an ESC with the following features (not necessarily in order of importance):

- 100-120A rating.
- 50v+ rating. I want to run about 15-20% under the max rating for reliability.
- Decent level of programmability.
- NO COGGING! Never had a setup that did, and don't want one now.
- Adequate heatsinking. I'm don't like temps above 130-140*F.
- Fast/easy domestic support/warranty service.
- No special signal translation devices needed (pistix)
- Adjustable LVC (can set the v/cell value). I like a 3.1v-3.2v/cell cutoff.
- Priced at $300-$400.
- High quality. I don't trust those ~$100 100A HV ESCs. If it seems too good to be true, it probably is.

The boat guys are having fun with the Power Jazz. From what I know about Kontroniks, the true AMP rating is a bit higher then what they say it is.

Mod Man · 01.29.2008, 06:29 PM

I would go with the HV110. I have 3 of them and LOVE them! Also, I have never needed a pix stix adaptor for any of mine. I am not sure why you say they are needed. I merely set my trim and EPA to work with it. No problem. I have run them with my Futaba 3PK and my DX3.

I love the USB programming. Very cool.

Matt

Mod Man · 01.29.2008, 06:30 PM

Oh, I pull 127 amps out of my HV110 on 12s and it runs fine. No heat issues what-so-ever.

Matt

BrianG · 01.29.2008, 06:38 PM

Well, most aircraft ESCs are meant to use a stick throttle.

- Max throttle (2ms) for a pistol radio is max throttle for a radio.
- Neutral (1.5ms) for a pistol radio is half throttle for an air radio.
- Brake/reverse (1ms) for a pistol radio is min throttle for an air radio.

So, many need something to translate the signal so a pistol radio can be used. That's good that I don't need it! And nice to hear it doesn't heat up even with higher currents (I assume your 127A figure is burst?).

It looks like the HV110 is a winner then!

Mod Man · 07:57 PM

Yup, again, I have never needed any adaptors to run my HV110. It just works! In fact, it is far less throttle position sensitive (for arming) than my MGM Com Pro ESC.

Yes, that 127 amps is burst. I have pulled over 100 amps for relatively extended periods of time, though (6 second runs). I run mine run after run back to back with no heat issues. I did put a fan on it when the weather got really hot. But, it didn't need it. It never got hotter than 130 degrees according to my Eagle Tree temp probe.

I cannot recommend the HV110 enough, especially for the price.

If you have any programming issues or questions about it, call CC and ask for Joe Ford. You can tell him I referred you to him. He gave me great info on setting up my ESC for top speed use.

HV ESCs are all that Nic Case will run. We have spoken for extended periods of time in numerous conversations about this very subject. He and I are both very hard on equipment and we have both had fantastic luck with them.

Oh, wait till you see his TS car for this season! ;)

Matt

BrianG · 01.29.2008, 08:30 PM

That's good to hear. I anticipate the majority of the current draw will be up to about 30-40mph and then drop to a more manageable level, so 110 should be fine. Programming it should be pretty straightforward, so hopefully won't need any help.

The only thing I'm a little concerned about is low rpm performance considering that it is geared so high. I'll know more once everything is hooked up.

Mod Man · 01.29.2008, 08:40 PM

Well, my TC4 is geared 1.8 to 1. That is geared for 150 mph wheel speed and I have no low speed issues what so ever. It just launches! It will tool around nice and slow or really launch with no cogging at all.

Oh, I get HUGE tire smoke even when the car is running 100 mph. You cannot appreciate high speed and crazy power to weight ratio untill you drive it!

Matt

its me · 03.25.2008, 04:24 AM

Quote:

Originally Posted by Mod Man

Well, my TC4 is geared 1.8 to 1. That is geared for 150 mph wheel speed and I have no low speed issues what so ever. It just launches! It will tool around nice and slow or really launch with no cogging at all.

Oh, I get HUGE tire smoke even when the car is running 100 mph. You cannot appreciate high speed and crazy power to weight ratio untill you drive it!

Matt

Could I have a link to this build? I have been kicking around the idea of a TC4 but do not see to many people that build them?

Mod Man · 03.25.2008, 09:06 AM

Here's a link. http://www.rcgroups.com/forums/showt...=top+speed+tc4

I do not want to hijack this tread, though. You can PM me with any questions. I can shoot you my number too if you would like.

Also, Nic Case is a friend of mine. We have talked about the TC4 ALOT. Between the experience of the two of us, I doubt there is anything TC4/top speed related I cannot answer (and yes, there are a few MUST DOs with the TC4 that are needed for top speed running).

So, back on topic;

The HV110 will be plenty. Going with the custom HV160 is not needed. I pull close to 130 amps on 12S through my HV110 without any issues at all. It just runs and runs and runs. Amazing ESC. Now if they can just give the darn thing decent brakes.............

Matt

its me · 03.25.2008, 12:26 PM

Quote:

Originally Posted by Mod Man

Here's a link. http://www.rcgroups.com/forums/showt...=top+speed+tc4

I do not want to hijack this tread, though. You can PM me with any questions. I can shoot you my number too if you would like.

Also, Nic Case is a friend of mine. We have talked about the TC4 ALOT. Between the experience of the two of us, I doubt there is anything TC4/top speed related I cannot answer (and yes, there are a few MUST DOs with the TC4 that are needed for top speed running).

So, back on topic;

The HV110 will be plenty. Going with the custom HV160 is not needed. I pull close to 130 amps on 12S through my HV110 without any issues at all. It just runs and runs and runs. Amazing ESC. Now if they can just give the darn thing decent brakes.............

Matt

Thank you very much! Im drooling here :)
K back on topic- brian what speeds are you shootin for?

BrianG · 01.29.2008, 08:43 PM

I can imagine! I'm looking at between 4.5-5HP in my rig!

Mod Man · 01.29.2008, 08:49 PM

I calculated 4.59 HP by taking the 3600 watt draw, calculating the motor and ESC efficiency and I came up with that number.

You will probably be looking at about 3.5 to 3.8 HP of actual power output when you take the efficiency into consideration.

That should be plenty of power for what you are doing.

Matt

BrianG · 01.31.2008, 05:48 PM

Not to throw a wrench in all this, but what about this ESC: http://www.hobbycity.com/hobbycity/s...idProduct=4691

12s @ 100A sounds nice to me. And since I'll be running 9s, it gives me a little headroom on voltage.

All the user reviews seem to think highly of it, and it doesn't need a pistix adaptor. Warranty/service might be an issue, but for the price, it's hard to pass up!

MetalMan · 01.31.2008, 08:13 PM

Quote:

Originally Posted by BrianG

Not to throw a wrench in all this, but what about this ESC: http://www.hobbycity.com/hobbycity/s...idProduct=4691

12s @ 100A sounds nice to me. And since I'll be running 9s, it gives me a little headroom on voltage.

All the user reviews seem to think highly of it, and it doesn't need a pistix adaptor. Warranty/service might be an issue, but for the price, it's hard to pass up!

I've had good luck with it in my MT2 and a 4130 outrunner on 10s1p A123, geared for ~75mph. It runs cool, too bad the same can't be said about the motor. It's just too bad it takes up so much space!