SD2006

Have you considered a Neu? Lehners perform well but their rotors aren't very well balanced and with the weakness of the dollar, they might be a bit overpriced for buyers in the US.

1maxdude

Yeah, but that 7700 would whip that velineon around any day. I don't know why so many people are in love with high voltage low kv motors. I'm sure they are more efficient and run cooler, but jeez if it runs that hot, gear it down and/or put a fan on. For speed runs, my esc takes the grunt of it all and the motor never hits past 140. Geared 23 or even 28/83 and with a 3s lipo on a 6900. I've recently added a fan to the esc, so it should dramatically keep things in check as it has already proved itself bashing around off road so far. Speed runs arent as bad as off roadin as far as temps go, so I'm not saying my 6900 always stays cool. When I bash around with a 2s, it hits around 160-170 geared 17/83. I wish all these high h.p. low kv BL systems would come sensored. My rustler has the mamba max, but my stampede will be LRP all the way.

Takedown

My Feedback: (23)

The 7700 isnt fair game for any motor really because it is total crap... The velineon would put up a fair fight for speed trails but torque its a straight win for the velineon.... LRP is a good company, I esspecially like the Sphere COMP ESC because I use to have one. Only downfall of it is that its sensored and underpowered.

warheadforever

I won't say it is junk, but it defiantly has a lack of torque. But it is good if you plan on running a 6 cell.

Takedown

My Feedback: (23)

I just think the CM36s series motors are junk because they are terribly inefficient, run to hot and they definately lack torque... If your going to spend that much money on a motor do some research and get something worth your time and money. Such as Medusa's V1 series 36-50's. Their Neu 1509 knockoffs for $85.

warheadforever

Well I will say one other thing, mine does not run hot at all, I am geared 18/72, and it runs about 120-125 degrees.

Takedown

My Feedback: (23)

Thats a little hot IMO for your gearing... The medusa or another motor of equivalancy would run even cooler.

warheadforever

I do like the Med USA motors, I plan on getting one, when ever I get some money, and when I have all my other stuff fixed.
Also it ain't that hot when it is 104 out....

1maxdude

Those are exactly the two reasons I'm going with it. I want extremely smooth operation at any speed and I really don't want THAT much power. Most fun I've ever had with RC was rompin around through construction sites with the stampede in stock form, but wanted just a little more power.

1maxdude

Warhead, you run 6 cells on your 7700? Never tried lipo? That lack of torque is because of the batteries.

Lilredmachine

Yup, good old traction control from having nimh batteries.

The 7700 has as much torque as the 4600. It just heats up because it tries to rinse more rpm from every volt.

SD2006

The 7700 cannot produce the same torque per amp as the 4600. The only way to get decent torque out of the 7700 is to run huge current through it, and that's why it gets hot.

warheadforever

Well, it still pops wheely whenever I want, all I was saying was that if I geared it any higher, I doubted that it would have the torque to get the job done. Oh, and yes, I still run 6 cell Ni-Mhs, and no I don't want to try Li-Po, I don't have the money, and I just don't like them...[]

1maxdude

Gotcha. Not going to rant about the virtues of lipos here, I did enough of that in that other thread. Sorry take down, 3 pages and still no pictures/videos/proof of any speed builds.

ty2000

Old school bolink 10, 6cell mached 1400's, revolution motown missle (12x1), Novak T-4 speedo geared @ 23/80= 63mph
Most of my gear is older than some of you guys in here, i find that funny.

SD2006

63 MPH on 6 NiCads and a 12T brushed motor? How did you measure the speed? That's almost too fast to believe, even for a road car.

Edumakated

68.7 mph
Electric RC8
5s 4000 Zippy Lipo
Neu 1512 1.5d
Gearing 23/46
MMM Esc

Recorded by GPS strapped to rear wing. Barely got to full throttle before the tires blew off. I think I can get it up to 80mph if the car was lowered and running on foams.

Takedown

My Feedback: (23)

I know that setup is very nice but those claims are a little high. I'd expect 50's range out of it. Pics of the buggy and setup and a vid of the speed passes would be nice...

SD2006

Seems like a reasonable claim, especially with GPS. How do you like the Neu? I'll be running an RC8 on 6s LiPo is with a Neu 1515 1Y (when it gets here). I'm starting to wonder if 2200 Kv is too low...

Takedown

My Feedback: (23)

It doesnt sound right to me. Every setup I see on rcm with vids almost exactly like that hit around 55mph.

SD2006

Got any links handy?

Edumakated

Unfortunately, no vids. I will try to get one next time. A bunch of us go out to a parking lot to bash on Friday nights. It was witnessed by about 20 people, some of which hang out on the RCM board. Completely legit. I made quite a few passes and there was very little deviation on the mph. The 1512 1.5d is a 3300kv motor. It spins fast enough on 3s to beat most nitro buggies easily. On 5s, it is pushing 60,000 rpms. I could barely keep the front end down and I went through 3 sets of tires. My car is really made for racing, not bashing. It was not really set up for speed runs other than on road tires and some stiffer springs. I made the run with no body. That is why I think I can get it up to 80mph.

If you use the RCM calculator it says the theoretical speed would be 77 mph. Drag adjusted is 69mph and I am telling you I hit 68.7mph. This was with the on-road tires in the picture. I forgot that I actually did it with a 21 tooth, not the 23. The 23 tooth pinion was pulling hard but the car would wheelie before I could get it up to full throttle. The 21 tooth allowed me to get full throttle at least for about half a second.

I started running a 1515 2.5d for racing which is what is in the picture which is just a 1650kv motor.

Edumakated

Bashing or racing? The 1515 1y on 6s will be blazing fast. 2200x22.2 volts = 48,840 rpms. That is about the same as the 1512 1.5d on 4s which is stupid fast. Believe me, you will not be disappointed. The 1515 is a great motor. You might need to tune the torque down a bit though. A 1512 can easily wheelie an rc8 and the 1515 is the standard size motor used in truggies so the car might be a bit over powered. I run my 1515 on 5s which is just 30,000 rpms so it doesn't feel as out of control as a higher rpm setup.

SD2006

I don't plan on racing, so it'll be for (gentle) bashing. I figured I'd run a 4s battery for general playing around and a 6s for psycho speed runs. I like the layout of your car, a few questions....

1. What motor mount are you using?
2. What battery tray?
3. It looks like you've got Ofna 86505 tires. Do they balloon badly, how's the balance?
4. Where did you get 21 and 23 tooth pinions?
5. How well is the RC8 drivetrain handling all that power?

Thanks...

ElectricGuy007

Finnally an E-RC8 I have not seen one of those yet. I bet it's fast with that motor you chose.
Did you whoop any nitro's with it yet?