CEN R2 Matrix....!! - RC-Monster Forums

jzemaxx · **CEN R2 Matrix....!! -** 03.01.2009, 07:14 PM

Guys I'm about to move up to the 1/8th scale buggy class racing. Going with the new R2...how does this setup look??? Am I missing something?? Going with a 1512 1Y and MMM ESC on twin 2S's in parallel.

Differential Ratio: 2.888888888888889
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 46
Pinion Tooth Count: 20
Total Voltage: 7.4
Motor KV: 2750
Tire Diameter (inches): 4.3
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.0035
Spur/Pinion Ratio: 2.3 : 1
Total Ratio: 6.64444 : 1
Tire Circumference (inches): 13.51 inches (343.12 mm)
Total Motor Speed: 20350 RPM
Vehicle Speed: 39.18 mph (62.94 km/h)
Effective KV Value: 2750
KT constant: 0.49 oz-in/A

Hardstyle · 07:27 PM

I don't know much about buggys, but isn't everyone using something like 4-5s lipos on them? 2s lipos with 2750kv might have a less torque? Personally I would put some lighter kv motor, more voltage and gear it down.. But again I don't have a buggy :D

jzemaxx · 03.01.2009, 07:31 PM

Its to keep the weight down. Also I'm only trying to go 40mph....not 60 like most. Also buggies are VERY light so running higher KV motors and lower voltage is not as bad.

jhautz · 03.01.2009, 10:09 PM

Ummmm.... I agree with the last guy. Your not gonna have much success with 2s in a 1/8 buggy.

I would strongly recoment going with at least 4s.

jzemaxx · 03.01.2009, 10:43 PM

I figured since it was so much lighter, it shouldn't need such a large motor and lots of voltage. Heck 3S on a 1512 1y on my buggies truggy is stupid fast and runs 35-40mph and runs cool. The buggy is another 1-2lbs lighter.

rootar · 03.01.2009, 11:06 PM

go with a 1512 2.5d on 4s or 5s and gear for 40 and youll be golden...

or atleast go 4s on that 1512 1y and gear down for 40...... your gonna have a HOT motor and puffed lipos if you try to put a little 1512 only spinning 20,000 rpm in a 7.5-8 pound buggy and gear it for 40mph.... it just dont work like that.....

jzemaxx · 03.01.2009, 11:09 PM

I was also looking at the 1515 1.5D

brushlessboy16 · 03.01.2009, 11:11 PM

the 1515 1y on 4s seems to be a hot ticket.

jzemaxx · 03.02.2009, 12:01 AM

Quote:

Originally Posted by brushlessboy16

the 1515 1y on 4s seems to be a hot ticket.

Just trying to save weight. Using a 1512 should be a little lighter.

lincpimp · 03.02.2009, 12:32 AM

A 1512 will be fine. I would go with 5-6s and smaller packs. I run a 1600kv medusa 60mm (similar to a 1512) in a hyper8 with 6s 2170 mah 25c fp lipos. It is well under 8lbs with batts and the body. Runs great too!

jzemaxx · 03.02.2009, 02:10 PM

Quote:

Originally Posted by lincpimp

A 1512 will be fine. I would go with 5-6s and smaller packs. I run a 1600kv medusa 60mm (similar to a 1512) in a hyper8 with 6s 2170 mah 25c fp lipos. It is well under 8lbs with batts and the body. Runs great too!

What kind of run time??? Our A-mains are 30 mins......will it make that kind of main??

Arct1k · 03.02.2009, 02:47 PM

No - 30min mains are going to need a battery change...

jzemaxx · 03.02.2009, 02:48 PM

I wonder if I could get away with a 3S setup and run 2 in parallel.

Arct1k · 03.02.2009, 02:58 PM

You will have a faster more reliable setup without - too heavy a battery will just slow you down and cause breakages...

I think you'd be better off with a change - JHautz runs in longer races - I'd listen a lot to him...

jhautz · 03.03.2009, 01:34 AM

2 3s packs in parallel have the same amount of energy as 2 3s packs in series or one 6s pack of double the capacity. Its all going to weigh the same. so what are you gaining by running the lower voltage. You will get better runtimes and lower temps by going with double the voltage and half the capacity as long as you choose an appropriate motor to go with the higher voltage.

Ive been racing my 1/8 buggy and have tried alto of different motors and voltages. 3s,4s 5s 6s etc... and easily a couple dozen different motors. So far the best combo for staying cool and giving long run times on the track without being totally overkill and undrivably powerful has been a 5s setup on either a 1512/3d or 1512/1.5y. Both have been great motors for 5s racing.

I thought you said you were looking to save weight??? Saving weight and trying to run for 30 minutes without a pack swap are totally contradictory to each other. to make 30 minutes you would probably need 6s and 6000mah minimum 5s 8000 or 4s 10,000mah. Thats a heavy pack. you will be better off going with a smaller pack and doing a swap if you want the buggy to handle properly.

Just remember, the lower the voltage you choose the higher capacity pack you will need to carry the same amount of energy.

If 30 minute mains are your goal I'd recommend the 1512/3d and a pair of 5s 4000mah packs and swap them at the 15 minute mark. If you want to be safe on making the runtime go with a pair of 5s 4300mah packs. Neuenergy has a deal going on some nice 5s 4300mah packs right now.