Your Own Prediction
 

Hi, as I said befor, I haven't run my t4 with the 1930/9918 setup on 11 cells yet so I would like to hear from all people in this forum about the estimated speed they might be expecting out of the T4 with 1930/9918 setup. You can talk as much as you want since I've started this thread for fun in the first place.:L:

Speed will depend on gearing, but the system is capable of pushing that vehicle to 70+ mph......if you can keep it in a straight line!

Sounds cool. In fact I didn't buy the t4 to race, but to sweep the ground with speed.

good luck keeping it in a strait line. i can barley keep my emaxx on the road:D

I'm still not sure if the motor is performing well? I dont know why, but it still seems weaker than it should be( at 8.4 volts that is).

What turn motor did you get?

It's the LEHNER 1930/5 turn brushless motor with the BK 9918 ESC. This motor is absolutely powerful from what I've heared so far. Some people used it in their TC3 and they've destroyed all the drive shafts of the car and bent the main shaft as well. My motor didn't give me the feeling that my T4 is suffering from overpower at all and that is why I'm worried that it wont deliver any massive power when I'm going to use the 12 cell pack on it. I'm also lacking a good power supply even. O'good lord...troubles are just popping up from every where. AAAAAAAARRRRRRRRGGGGGHHHHHHHHHHHHHHHHH.
May be I should visit a psychiatrist or something?!!

That motor ain't that fast. I'ts only 4200 KV so using 7 cells, you're only getting aobut 32,000 rpm. Using measly 7 cells, a basic 5300 will go faster. A cheap feigao 8s is faster. A Novak SS5800 is comparable... That motor is hardly working with 7 cells. What gearing are you using anyways? What's the tranny ratio? I'll give you some numbers...

Well...if you say so Lipo guy. I thought that the 1930 motor has enough power to pull the T4 to at least 45 mph, however, I knew some how especially after M.Mike had told me that smaller rotors spool up faster than bigger ones that there is really a segnificant difference between the 1930, 1920 and KONTRONIK'S FUN 480-42 motors in terms of acceleration and fast spool ups. The FUN 480-42 wins easily against the rest of the others. I have tried it on 7.2 volts in a B4 and the power was similar to a 13-14 turn brushed motors and the acceleration was okay, but things were absolutely incredible when I supported it with a 12 volts pack. The B4 with an on road tires made back wheelies the whole time and it was almost impossible to drive it at full throttle and when you push the throttle to it's fullest point and steer the buggy it's like a crazy fan rotating on the ground..hehe..that was some experience indeed. The 1920/8 turn however, is not as fast as the 480-42 motor when it accelerate, but it's surely much cooler than the 480-42 after few runs and the 1930/5 turn in the other hand is like an old geezer who can bearly accelerate, but he can give you some good top speeds @8.4 volts so I'm curiuos to see what it can deliver with a 13.2 volts pack. The tranny ratio( this one is the ratio of the T4 which is the same as the B4) is 2.40:1 and the F.D.R is 10.5:1 which is in my opinion a very logical gear ratio comparing it to the huge amount of power the 1930 can put and yes it can only give 4180 rpm@1 volt so I guess that is one reason why it is not fast. Well that's all..for now at least.

Would one of these on 16 cells make an E-Maxx over 70mph? Or does it not contain enough power?

I think their limit is 15 cells and besides, the one I have is a 5 turn one which means it will reach it's peak rpm at 12-13.2 volts since Lehner recommended no more than 50,000 rpm as the limit for the motor's speed, but take this for certain: use a 8+ turn 1930 motors with an E-MAXX weather stock or modified and you WILL experience some true speeds. It can eat a .21 T-MAXX alive with 14 cells. Not to mention that things will get sick if you use a dual system.

The 1930 motor will be capable of outstanding power, torque, speed, etc. but the rest of your electronics must be able to deliver that kind of power. The 1930 5 turn could easily suck up 100+ amps during acceleration so if your batteries or controller isn't up to it, you're not really hitting its potential. Yeah, give it 12 cells or so and that motor should suddenly wake up. Nice thing is that you can probably gear it even taller with this motor vs. the 480 or the 1920 motor.

so with all the speed discussion...what would be the fastest combo for the t4? (assume stock gearing of like 18/87)

So you want to tell me that the 9918 ESC is not the right choice for the 1930/5 turn motor and that I should look for the bigger ESCs that is available in the market like the BK 18120 and 18150? BTW, they're too pricy.

The 9918 will handle that motor in your 1/10 pretty easy.

Well..now the only way to confirm the safty of the motor and that it is not damaged or defective is to throw in a 13.2 volts pack and see what I could see with eyes unclouded. Wish me luck fellas.

Good Luck! I am looking forward to the results!

There is no luck needed. I ran a 1920 5 turn motor with 14.4 volts on my emaxx before. Ran REALLY hot, but thing didn't blow up. Then, the pinion gear fell off and the motor was REALLY screaming (took me a couple of seconds to realize that the pinion was off while I was trying to floor it!!!)

The 5 turn is way over 6000 KV so I was in the realm of like 70-80000 rpm!!!

BTW, I'm not saying that the 9918 can't handle it, but I know that my 12.97 would thermal under race conditions with the c406s and the 1920 5.

The 12.97 is no match for the 9918 warrior controller in terms of its ability to handle the heat. The lack of a heat sink makes it thermal pretty easy, actually. I meant good luck driving the car! I know the motor and controller will handle the duty no problem.

Thanks, then I'm sure you'll hear some real good news.

Reporting in: 1930/5+9920 ESC = scary fast
 

Hi there everyone, I just got a very good power supply three days ago and I had the chance to charge my 13.2 pack too. I went to visit my relatives and I took my T4 with me and it was equipped with the super brushless setup. I went to the front street of my relatives' house and put down my truck, activated the transmitter, activated my car and it was 12:45 AM. I gave it only 10% of throttle and it went on in a moderate pace around 19-20 MPH then I gave it 40-50% throttle and it behaved like if it was running with a 10 turn double brushed motor( it was pretty cool indeed) eventually I went for 100% throttle and....MWAAAAHAHAHAHAHAHA. The speed is simlpy astonishing and to tell the truth I have not seen its true speed yet because the street was pretty short and the truck instantly flipped on its back the first Time it acelerated to full throttle and it kept crawling on its back for a meter and a half ( the truck was running without its body so I committed the most stupid thing for a first run) as a result the front and rear shock towers almost worn out, but fortunately they did not break. The truck makes wheelies the whole time and the power was devastating (not really) and the speed was beyond any speeds I've ever seen and do not think that I'm lying if I say that the truck reached the realm of the 70s mph. I even saw the rear tires ballooning to the point that I thought It was going to blow out. Now for the drawbacks: At some point the 9920 seemed to thermal a bit and it was very hot as well as the motor and I also found that the truck was lacking acceleration power as well and only after a couple of minutes of running. One possible reason could be the ESC itself and that its not delivering enough power to the motor, because the motor is a Hi-Amp version that sucks a lot of power from the controller either during acceleration or continuos running. Another reason could be the gear ratio which is around 10.2:1 ??! So what do you think everyone?

WOW!

oh and did i say WOW?

70mph is a very nice target! Stick a Venom speed meter in and give us some figures. :)

Anything above 50mph is way too fast for me, is it controllable?

Squee - Use the edit button! ;)

yea forget about that button sometimes

Absolutely it is uncontrollable. Now I'm thinking about putting the 1930/5 in my B4 with 14.4 volts and it could fly away goodby.

What batteries were you using? The controller will deliver the power to the motor with no problem. If it was lacking acceleration, it could be a battery issue(not able to deliver the power). The controller will throttle down if the voltage dips below around 55% of its starting voltage(when it is plugged in). Sounds like you had a good time, though!

Well I really dont know, but probably because of the pressure I was in while I was running it with all that speed in my hands. Do you think that because I have mounted the ESC in the rear shock tower and because the flow of air could not reach it properly it started to thermal a bit? I even took it out to check it and the shrink cover of the controller shrank even more to the point that it ripped at some places. The controller was truly hot( no kidding). And one other thing: the 3PK transmitter has a function called -throttle acceleration-which enables you to increase speed of acceleration even more and maybe that played a role in heating up my controller.!! :C:

You had to be running it pretty hard to get a thermal! dRop a tooth or so on the pinion and see if it happens again.

It is amazing how hard it is to get a RC car over 60 and be under control of it. It took me quite a bit of tuning and the right tires until I finally got it to stop flipping over just before 60 mph.

When a traxxas bandit flips over at 60 it will do approximately 10-15 rolls in about 100 ft of space. Really cool to see lol.

I can finally get over 60 no problem now but still haven't got to 70 mph. I am going to try again next week. I use about 500-600 feet of road for these runs and my best runs have been with my lehner 5300 and 9918.

Get a GPS for that thing Captain. It really sounds like a beast and I would love to here how the T4 handles at speeds over 60.

I bet it's a blast on 13.2 volts:D

I've been thinking seriously about getting a GPS, but later. For now I must achieve my 87 MIIIIIIIIIIIILES PER HOUR whether with the T4 or the B4. I have the RC10L3 though, but I have no interest in running it to such speed..no..no.I would rather take it to an angelic speed over 1500 light years..oops..I bet its a bit tooooo much. Any way I made a change in my plan. I've took out the 1930/5 out of the T4 and I'm going to put it in my B4 (which I've originally decided to make it the vessel that will carry the 1930, but since I didn't have a good ESC for it I bolted it in the T4 along with the 9920) and I will wait for the MAMBA MAXX to come out to couple it with the 1930. As for the T4 I'm going to return the 1920/8 back into it and I might add another cell to my 13.2 volts and make it 14.4 volts pack and might see a change in the behavior of my T4. And about what you said M.Mike I think you are right. I truly ran it extremely hard. I even made the T4 go climbing a pile of sand and stones and the wheels were spinning without making the truck move and I put all the power into the motor to the point where I made a shower of sand and stones( I'm talking true this time) it was truly a scene to be hold and also very scary since one of the stones that were raining almost scratched me. Oh well, wish me luck next time everyone.