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Bl Cen matrix build
Hey guys im picking up a second hand cen matrix tr FRE edition, it just gonna be a basher. occasional racer.
Setup will be: 5s 4000mah Zippy lipo (blue heatshrink) MMM w/ switch removed Neu 1515 1y-possibly castle's if they release it soon M8 radio Duratrax sx-200 servo http://i152.photobucket.com/albums/s...RE/matrix1.jpg http://i152.photobucket.com/albums/s...RE/matrix2.jpg that mount is old ^^^ http://i152.photobucket.com/albums/s...RE/matrix4.jpg http://i152.photobucket.com/albums/s...RE/matrix3.jpg http://i152.photobucket.com/albums/s...0FRE/mount.jpg I have a few questions: As far as battery trays go, i dont have 45 dollars to drop on a RCM tray as much as i would like.. I currently have a twin force tray, but i would need to cut one side off it to get my batt to fit.. Has anyone run the tekno battery tray? the only problem is that my battery is an odd size 50.8mm wide and 151mm long, i dont know if stuffing the battery into the tray would be such a good idea.. Second is for a motor mount, i am debating between Mike's mount and Tekno's 44mm mount.. any suggestions,questions or concerns, Thanks for the help in advanced -Ben |
Thnks BL rv0 for noticing that im at
2000 POSTSSSSS!!!! WOOOOHOOOO |
Mike's mount FTW!! :lol:
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oh come on guys, i have seen linc, hoovartid and other looking at the thread and no responses??? cmon :no:
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No guarentees it'll be getting sent out friday. I still need to cash the check I just received to get it out.
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ok, well anyways
Also have some hyper st mud guards for the chassis on the way. still havent decided on a mount or tray yet.. |
make your own! i made my tray from the sae plastic (HDPE) that mike uses. the flexiable (somewhat) chopping boards, tell ya what, its 100 times easier to work on comared to acrylic sheet!
i used a mill to cut mine but u could easily use a coping saw or similar to do it. took me a few hrs but im happy with my job. check my hyper 8.5 build thread for pics... the mount, u can always just try making one yourself or saving up and spending the cash on mikes one. ryan |
If you use the Tekno mount, you will need some metal chassis stiffeners to prevent chassis flex which would change the gear mesh. With the RCM mount, you don't have to worry about this because the motor mount is attached to the center diff. I really liked the Tekno battery tray for the Revo, so I am sure the quality of their other battery tray will be as good. Only problem is that you have to drill 4 new holes. With the RCM battery tray, you can use existing chassis holes which is a huge benefit in my opinion, however I found the Tekno battery tray to be more securely mounted to the chassis, but the RCM tray holds the battery more securely, so each have their pluses and minuses. You can't go wrong with either one though. :wink:
Hope this helps. |
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as for battery tray.... still 10 bux vs. 45 bux. Tc3, do you have any other pics of that tray? |
Is Mikes mount designed for the truggy or buggy, buggy has 46t spur, truggy has 66.
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Its designed for the buggy but will work with the truggy. Cant have huge pinions seeing how the spur is big and that the mount is shorter.
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Holy crap a 66t mod1 spur? That's HUGE!!
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my point, i dont know if anything will fit, i would need a 9 tooth to go 38mph...
with the big spur i need like a 14 tooth to do anything decent. i think the tekno mount is a better choice here, i have 2 3.9inch turbuckles that i can use as braces to prevent chassis flex :D |
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thanks magman, im still convused about how to go about this motor mount
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I've got a 10t mod1 5mm pinion I could sell ya.
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You could try something like this.
http://www.rc-monster.com/proddetail.php?prod=KYOIF148 |
hmm maybe, 10t would put that at 41 mph, then my current pinions (16,20) would be of no use :P
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I could use a 20t. You wanna trade?
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i dunno yet
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ill take some after my torture test today... when i get home from my holiday!
here are some dodgy camera phone pics... ill take some better ones tonight. anyway here here they are.... i used a 7mm chopping board and glued them together using 5 minute epoxy (find something else to use as this cracked and split easily. super glue seemed to work muchbetter but is difficult to get right in 2 seconds... i then milled the center out and used a plane + rasp at school to even it down etc... worked out well. then i used a soldering iron to melt tracks for the velcro. on the bottom i used 3 layers of acrylic sheet (d use this same cutting board material when it breaks, at the moment its too brittle! and DONT use aluminium screws, they just snapped when i was screwing into it... took me 5 screws to learn that lesson!!) to make it sit over the side guards... it flexes now but thats better than being solid i guess. i didnt take the battery out cause its a PITA to remove with all the velcro on the bottom!!! anyway i hope this has helped somewhat... http://i260.photobucket.com/albums/i...09-08_0916.jpg http://i260.photobucket.com/albums/i...09-08_0915.jpg http://i260.photobucket.com/albums/i...09-08_0914.jpg http://i260.photobucket.com/albums/i...09-08_0913.jpg http://i260.photobucket.com/albums/i...09-08_0918.jpg http://i260.photobucket.com/albums/i...09-08_0921.jpg |
ahh it looks nice, i think i might go with the tekno mount, just because i will have more adjustability. i beleive the cen mount by mike is designed for the buggy..
hopefully mike will step in and prove me wrong :D |
So does your dad have any c-clamps or wood laying around in the garage? Go buy yourself a piece of 3/16 lexan, or Centra at the hobby shop. Measure your battery and mark the width lines on the piece of material (add 1/4" to your measurement - its easier to add material than it is to remove it in this case. Use a straight edge or a square to mark the lines.
Now, if you can, cut a piece of wood to match the width of your batteries. Clamp this onto your piece of plastic. Use a heat gun/hairdryer whatever to heat the material and bend it. Do one side at a time. Another thing - dont use too long of a piece of material and wood. Cut them to about 1" longer than needed in length to start with. Once you've heated it, pick up the whole thing and use the surface of the work bench or even the floor to make the bend. Keep in mind, you might have to try it a few times before you get the hang of it. If you end up using lexan, once it starts to bubble, you've heated it too much! |
we do i just wouldnt think that lexan would be structurally sound..
plus i don think any place around here carries lexan |
I responded to your PM Ben.
Yea the CEN stuff has wierd gearing in the diffs... I would do whatever you neeed to do to get rid of that Ferris Wheel 66T center gear. It screws up you gearing choices as well as pushing the battery way out to the side. What I did was replace the front and rear diffs with the Hotbodies 43/10 truggy diffs and then the center spur gear with a normal 46T buggy spur gear. It was a good setup. I took out the spacers that CEN has under the center diff mount that raise it up to work with the stock 66T gear, then the RC-Monster Cen buggy motor mount will work with about a 1/2 or so spacers on the top so the upper chassis brace can bolt on in the stock position. I'm not sure about the exact size of that 1/2" spacer any more. You would have to measure the height of the spacer that goes under the center diff mount and get something the same height for the top of the mount. Not quite sure from memory, and I dont have it any more to measure anything. You can kinda see what I did in this picture. Hope this helped and good luck on the conversion. Its a great truggy for the price and tough as nails. http://i66.photobucket.com/albums/h2...s/CIMG2950.jpg |
replied :D
Differential Ratio: 2.8888888888888888888889 Transmission Ratio: 1 Other Ratio: 1 Spur Tooth Count: 66 Pinion Tooth Count: 13 Total Voltage: 18.5 Motor KV: 2200 Tire Diameter (inches): 5.65 Tire Ballooning (inches): .15 Motor Current Draw: 80 Motor coil Ω: 0.006 Spur/Pinion Ratio: 5.08 : 1 Total Ratio: 14.66667 : 1 Tire Circumference (inches): 18.69 inches (474.79 mm) Total Motor Speed: 39644 RPM Vehicle Speed: 47.85 mph (76.86 km/h) Estimated Adjusted Speed: 45 mph (72 km/h) - 6% loss Effective KV Value: 2142.92 KT constant: 0.61 oz-in/A Motor Torque: 0.26 ft-lbs Final Torque: 3.76 ft-lbs Final Power: 1480 watts (2 HP) thats with the stock diffs and spur. needs a 13t pinion for 45mph. thats doable/ here is with 46t spur Differential Ratio: 2.8888888888888888888889 Transmission Ratio: 1 Other Ratio: 1 Spur Tooth Count: 46 Pinion Tooth Count: 9 Total Voltage: 18.5 Motor KV: 2200 Tire Diameter (inches): 5.65 Tire Ballooning (inches): .15 Motor Current Draw: 80 Motor coil Ω: 0.006 Spur/Pinion Ratio: 5.11 : 1 Total Ratio: 14.76543 : 1 Tire Circumference (inches): 18.69 inches (474.79 mm) Total Motor Speed: 39644 RPM Vehicle Speed: 47.53 mph (76.34 km/h) Estimated Adjusted Speed: 45 mph (72 km/h) - 6% loss Effective KV Value: 2142.92 KT constant: 0.61 oz-in/A Motor Torque: 0.26 ft-lbs Final Torque: 3.78 ft-lbs Final Power: 1480 watts (2 HP) would need a 9t for that, pretty sure no one makes a 9t lol |
I was going to suggest the hb truggy diff gears, but did not know if they would fit the cen cups...
That looks like your best bet BB, plusit looks good, and you will have more room and centralized weight with the smaller spur. |
i would need the whole diffs. i only have 80 dollars to my name right now, will be 60 when i ship the warhead.
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The HB ring gear fits the Cen dif cup with a little minor dremel work for fittng. I know I had a set on the CEN cups in a matrix buggy for a while. In the truggy I just swapped the entire diff to the HB diff. Either way will work I think.
See if you can pick up a used set of the HB diffs on ebay or something. You should be able to find something for that money. |
what do you consider minor dremel work? i can do it on my schools lathe if neccissary..
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Just a little bit on out outside edge of the cup to make the ring gear fit over it. I actually think I just did it with some sandpaper. It didnt take much at all.
I have a brand new Kyosho center dif here with a 50T gear on it. (It think its a kyosho anyway) Not sure where I got it but it doesnt look like it has ever been used and I have no use for it at this point. PM me if you want it. Not sure if a 50T will work for you or not. But it should drop right into the cen if I rmember right. I'll let you have it very reasonably if you can use it. |
Century make a 9t pinion, but only good for a plastic spur.
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Novak also makes a 9t gear:
http://www.shopatron.com/product/part_number=5109/135.0 |
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i know that duratrax makes a spiral cut gearset for the raze (very stong i know from expireince) that might fit for diffs |
I wonder how that novak 9T ould hold up on steel. I tend to have more issues with steel gears hat are smalle rthan 13T. Even the hardened pinions smaller than that against steel whear out quicker. The angle of the teeth on that small of a gear is the problem.
BB: If you not sure the 66T spur with the 9T pinion will fit on the motor mount you can email mike. Basically you need it to have a minimum of 40mm from the center of the diff bearing seat to the center of the motor shaft in it farthest out positin to get that gearing to work. Not sure if it will. I think Mike usually designs them to work with the standard gear for the buggy (46T in this case) and the biggest poinion he makes (25T). That would require a minimum of 37.5mm center to center to work. He might put a little extra in there for safety so its possible it might work. Email him and see what he says. |
ughh 66/13 comes to 41.5mm lol just my luck
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Are you sure you are using the right front/rear diff ratio? I thought that the Truggy came with 38/11 diff gears on the Cen. The RTR Cen buggy comnes with the 26/9 gears and the pro buggy came with the 38/11 gears, but I thought all of the truggies came with 38/11 which changes your gearing picture quite a bit.
Double check the actual ratio you have. I could be wrong, but mine came with the 38/11 (3.455 ratio) if I remember right. Quote:
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i just checked tower, says the truggy is 9/26
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OK then. I'm probably just not rtemebering right anymore. I'm working from memory here and its not what it used to be. lol
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confirmation, just looked in the matrix assembly manual, it is 9/26
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