50 mph emaxx? - RC-Monster Forums

rcjmaxx · **50 mph emaxx? -** 01.02.2005, 03:10 PM

I just my hands on an Emaxx roller and wondered......what brushless motor,controller and cell count would it take to reach 50 mph?

HotnCold · 07:17 PM

Fifty mph - are you trying to get up to that speed and thats it or are you trying to run that speed for any sustained periods of time? Are you running 3300 batteries or li-poly - there is really no cut and dry answer unless you give some more info - Im sure Mike will be able to answer this question for you - i mean you could run a 7xl with a 72 tooth spur with a 22 tooth pinion and get 49.78 mph running 5 cell lipo in second gear - for how long i would imagine would depend on the speed controller - that you would need to talk to mike about..... hope this helps you

rcjmaxx · 01.02.2005, 07:40 PM

This rolling chassis weighs 9.9 lbs with 16 GP 3300s and stock wheels and tires.I do have a set of Clodbuster wheels,tires and adapters which are 1 inch taller and not much more weight difference.I know that kind of speed pulls alot of juice but I'd like to make a few passes and still get some bashing in before dying out.I know the Warrior 9918 is good for up to 18 cells,but is this asking to much of it?

HotnCold · 09:36 PM

I would definately waiting for mike to respond - my knowledge is limited on the current you are going to be pulling - but my guess is that you are going to work that speed controller way past its max - especially if you want to get a couple of passes and then do some bashing - based on the 16 cells and running a 66 spur with a 19 pinion you are gonna be at about 31.5 in 1st and 50.75 in 2nd - i would look into the 18130 or the 18150 just to be sure - but like i said i would DEFINATELY talk to mike about the speed controller and current ?'s before i did anything. I made a couple of mistakes with my controllers before i met mike and now i havent had any problems at all.. I am going to be upgrading to the 18150 in the spring - just to make sure i have no problems.......

By the way - thats my Gmaxx in the air indoors at our local track - running 12 cells with a 9L. We were trying to break the lights on the ceiling - We were about 2 inches from hitting them. :D :D :D :D

RC-Monster Mike · 01.02.2005, 09:55 PM

Hot-n-cold was pretty accurate with his advise. The 9918 warrior should handle the current for a speed run, but I would recommend dropping the gearing for bashing (or use first for bashing and 2nd for speed runs as hot-n-cold suggested). The 7xl can pull some current, so the best bet would be to get a speed control, that is a little more in the safe range (18120 should work quite well). On 16 cells, the 7xl will be quite a powerhouse for sure and will easily push 50+ mph. I would make sure you have cvds and upgraded diffs at the least. Your truck could lose over a pound easily by switching your tire/wheel combo to something along the lines of bow-ties (very light). This will make a big impact on run time, heat and current draw as well, because it is pure rotating mass that you are saving. My aluminum race maxx weighs just over 8 pounds (aluminum suspension, diffs, chassis, bulkheads, shock towers, cvds, etc.).

rcjmaxx · 01.04.2005, 10:01 PM

Thanks a lot for your help guys,but the reason I mentioned the Clod wheels and tires was with them being 1 inch taller was that the height would be a plus on the topend side,is my thinking off on that? Hotncold I see you mentioned li-po cells,I've been trying to talk to heli guys in 2 local hobby shops about these for offroad use and they beat the idea down bigtime.I understand the dangers involved being that these can be very explosive,but is there a place to go for accurate up to date offroad info this type of setup?

HotnCold · **li po cells -** 01.04.2005, 10:08 PM

You wanna talk to Mike about them - he is using them more and more - there are some pro's and con's, but if your careful ( charging )the pros outweigh the cons. Im sure mike will be able to give you some more info on this when he gets back into the office....

RC-Monster Mike · 01.04.2005, 11:01 PM

Quote:

Originally posted by rcjmaxx
Thanks a lot for your help guys,but the reason I mentioned the Clod wheels and tires was with them being 1 inch taller was that the height would be a plus on the topend side,is my thinking off on that? Hotncold I see you mentioned li-po cells,I've been trying to talk to heli guys in 2 local hobby shops about these for offroad use and they beat the idea down bigtime.I understand the dangers involved being that these can be very explosive,but is there a place to go for accurate up to date offroad info this type of setup?

Your thinking is on the right track (taller tires = faster top speed), but in reality, you are better off with a lighter tire and gearing up to get the speed. The clod tires are heavy and have poor traction. If you add a tooth to the pinion and run smaller, lighter tires, you will have a quicker, faster truck with more runtime and less stress on the drivetrain. For Lipo, I play with them quite a bit in my on-road car (tc3) and a little bit in my maxxes. The technology is great, but you have to be careful or it can get expensive in a hurry! RCZone has quite a few lipo/brushless users as well. If you have specific questions, I can answer them pretty accurately and help steer you towards the proper set up as well as tips for success.

ryanvm777 · 05:15 AM

Not sure if mine goes 50mph, but it sure feels like it. I have the 7xl running 18 gp3300. I have a 70 tooth spur and 19 tooth pin. I need to make sure to watch were I am going. A crash with this setup would break alot of parts.

HotnCold · 01.12.2005, 07:12 AM

depending on which gear your running you are close....about 30 in first and 47.5 in second. Are you running all stock gear train on your maxx.. I know when i had mine - i ran her hard and melted the driveshafts. A lot of power like that can be extremely hard on a drivetrain - nice maxx - good luck with it...:) :) :) :)

rcjmaxx · 01.12.2005, 05:24 PM

Clean,straight forward and no doubt fast.By the way what speed control are you using?

HotnCold · 01.12.2005, 06:11 PM

im running a schultze 1897kwf with a 8l on 14 cells. It gets out of its own way

ryanvm777 · 01.13.2005, 01:51 AM

I have the Warrior 9918. 1st gear is useless and second gear is still out of control fast. Front end will come up at almost any speed. Not sure how the gearing works but would probably be faster with the correct gearing. It has lots of torque. So top end speed could mabey be faster with correct gearing. Center cvd's is next on the list. Went threw 2 of them on same battery pack.

HotnCold · 01.13.2005, 07:15 AM

Yep - when you start making that much power - the drivetrain is almost definately a necessary upgrade. Very Kool though.....

rcjmaxx · 01.14.2005, 10:41 AM

Quote:

Originally posted by ryanvm777
Not sure if mine goes 50mph, but it sure feels like it. I have the 7xl running 18 gp3300. I have a 70 tooth spur and 19 tooth pin. I need to make sure to watch were I am going. A crash with this setup would break alot of parts.

Wth this much power,any mods to tranny at all?