General Speed-Running - RC-Monster Forums

MetalMan · **General Speed-Running -** 01.26.2007, 07:27 PM

Doing speed runs with my cars is something I have enjoyed. It first started with my Rustler on 4s 6600mah 8C Lipo and a Feigao 540 12s and then a Mamba Max 4600. Those Lipos couldn't hold their voltage very well, so speed was limited. However, the Rustler did hit 57.5mph (GPS verified). Gearing was 26/87 with HPI Geolandar tires all around.
Soon the Rustler will be running the Mamba Max 4600 system on 4s2p A123 M1 cells. This battery setup can put out quite a bit more power than the Lipos I had been using, so I'm hoping to speeds easily in excess of 60mph.

Yesterday I finished up my HPI MT2 18SS brushless conversion. It's using 4s2p A123 M1 cells (same pack that will be used in my Rustler) with a Feigao 540 8L and a mamba Max ESC. The tires are the ones that come with the 18SS kit. With 4wd, this truck is QUICK. It accelerates very fast, with a lot of control. It's geared 20/49 (38/13 at the diffs). So far, the highest speed I've hit with it is 55.7mph. That's without the body, though. I tried running it with the body since if the truck flips over it'll have some protection, but it went a fair bit slower with the body on. I think it hit something like 50.9mph, almost 5mph slower than without the body.

With both trucks, one major limiting factor has been radio range. The Rustler's range was worse than with the MT2, but the MT2 still isn't getting as much range as I would like it to. The radio is a MX-3 FM 75mhz, a Novak XXL receiver, and "genuine" Airtronics crystals.

It seems at least for 1/10 stadium trucks bodies aren't good to use if you're after speed. Anyone else ever found this?

phildogg · 01.26.2007, 07:39 PM

I used my old stock rustler body back when I had the 8s in it.. (both sold now) but I had great runs.. seems like alittle over 60 like 60.2 or some mph.. never tried it without though..was geared tall seems like I used a 30t pinion.
phil

t-maxxracer32 · 01.26.2007, 07:55 PM

30t piniuon holy crap! that would be for like ONLY top speed im guessing...

sleebus.jones · 01.26.2007, 08:15 PM

Quote:

Originally Posted by MetalMan

With both trucks, one major limiting factor has been radio range. The Rustler's range was worse than with the MT2, but the MT2 still isn't getting as much range as I would like it to. The radio is a MX-3 FM 75mhz, a Novak XXL receiver, and "genuine" Airtronics crystals.

I was using the MX-3 + Airtronics RX and had terrible luck. I switched over to a Novak XXTra and WOW what a huge difference. I get incredible range on anything that I use that combo on. I can just about drive it clear out of sight. I pick mine up used on fleabay, and end up paying about $45. It's a great deal when you consider you don't have to buy any more RX crystals.

Sleebus

phildogg · 10:06 PM

yeah what I used was strictly for 2-3 high speed passes.. never try to run gearing like that..LOL
phil

phildogg · 01.26.2007, 09:52 PM

now you have me wanting another rusty just for speed runs..hey mm why not shoot for the fastest speed comp.
phil

bdebde · 01.26.2007, 11:50 PM

Awesome on the MT2! I want to see some pics, as I have one too.

Here it is

Need a wedge body. I used to have some Dahms bodies on an old RC10T that were pretty wedge shaped, they were supposed to be aerodynamic. Haven't seen any in years.

jhautz · 01.27.2007, 12:34 AM

I found the bandit body on the rustler is much better for speed runs. More arrow dynamic.

bdebde · 01.27.2007, 12:57 AM

"arrow" dynamic huh?

jhautz · 01.27.2007, 01:03 AM

Yea.... You know.... Shaped like and ''arrow'' :005:

MetalMan · 01.27.2007, 01:22 AM

Quote:

Originally Posted by bdebde

Awesome on the MT2! I want to see some pics, as I have one too.

Here it is

Need a wedge body. I used to have some Dahms bodies on an old RC10T that were pretty wedge shaped, they were supposed to be aerodynamic. Haven't seen any in years.

I'll post up a thread some time. But earlier I accidentally drove the front left wheel into my foot at 5mph, and it broke the knuckle :mad:1. Fortunately I work at my LHS, so I should be able to get the part easily.

Quote:

Originally Posted by phildogg

now you have me wanting another rusty just for speed runs..hey mm why not shoot for the fastest speed comp.
phil

Not enough time, not enough money, not enough range (for now). If I ever get a radio setup that gives the range I need, I'll be set.

Quote:

Originally Posted by jhautz

I found the bandit body on the rustler is much better for speed runs. More arrow dynamic.

My rustler is about 95% non-stock. It would take a bit of work to get a bandit body on there (body post mounting). I suppose if I really get into speed running it might be something to look into.

bdebde · 01.27.2007, 01:41 AM

Quote:

Originally Posted by MetalMan

... But earlier I accidentally drove the front left wheel into my foot at 5mph, and it broke the knuckle :mad:1. ...

I sideswiped a curb at about 5mph today and broke the rear hub on mine. Was only a few blocks from hobby shop at the time so I was able to get a new one right away. Time for some aluminum hubs.

crazyjr · 02:14 AM

I have a T4 that will flip out at 45 so i just scored a super RS4 electric to continue my speed quest, 4600 and 5s anyone??

MetalMan · 01.27.2007, 02:19 AM

Be careful! I'm rendering a video of my MT2 from earlier today, that shows it running 55.7mph. Hopefully it will be ready tomorrow morning.

BP-Revo · 01.27.2007, 02:47 AM

Yea...speed runs are way fun - doing drag style passes with the Jato is a blast...even though its nitro

I've been wanting to get a FT TC4 to do some crazy high speed stuff. I've been trying to snag one up off ebay (especially since its out of production). I want the shaft drive...not the belt drive on the soon to be released TC5...

I am planning to put either a MM5700 and run it on 3S, or a Novak GTB3.5 on 2S. Its a big dilemma. I'd probably be happy with either system (I know the MM would smoke the 3.5 though) but its all a matter of cost. The GTB would cost me at least 50 bucks more than the MM, but with the MM I have to spend $100 per 3S Lipo pack...

As for the body, it probably is too high-profile and creates too much air resistance. If you can find a way to mount a Touring Car body on there, I'm sure it would be much better, and might even increase your speed.

Running no body creates drag because the air is moving across an uneven surface, but running with a body can create lots of resistance because more air must be displaced.