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Old 09-22-2007, 03:23 PM   #1
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Default Cen Matrix truggy 9 months later

I bought my CEN Matrix TR Arena back in January. It has proved to be a good solid truggy and a capable racer. I have not suffered any major problems other than the substandard engine which I have replaced, first with an OS 30VG and then with a XTM 457 Pro. I have made several upgrades to improve both reliability and performance. I wanted to post this info for those that may be considering a Matrix or already have one and are considering upgrades. First the stock motor had very bad quality control, but CEN has since changed to SH motors which are far better. I went with the OS because of there reputation, I was not happy with the new liner material on the 30VG and switched to the XTM Pro which is a 6 port ABC motor and it has been very strong. I have replaced the following with the CNC alloy pieces, the front spindles because the stock part is very soft and the screws will pull out. I also went with the CNC suspension parts because of the abuse they take, and lastly the servo saver/steering arm (which is weak in stock form). In my opinion that is all that needs to be upgraded to CNC alloy. I am running a Hitech (300oz) servo for steering, some say this is overkill but when those big tires start spinning there is a hugh amount of centrifical force generated that the servo must deal with. On the throttle I have a ACE 1313 which is fast and powerful. I switched to the 17mm hubs from the buggy because of wieght savings and a better selection of wheels. I have the CEN piggyback shock reservoirs and RMV progressive springs because for my track the stock springs were too soft. I added a JP-3 pipe/header and a brace to support the pipe, I found after some big air landings that the pipe would pull apart slightly in the middle causing a momentary air leak, with the brace it is rock solid. I added a NOVA cooling head and an OS air cleaner. You may have also noticed that my truggy has two fuel tanks, I added a second tank to give me more run time during practice sessions, it can be removed in 30 secs for racing. I have the Hickerson diff mod (replaced the LSD with open diffs) and I am running 10K-30K-5K. The steering gets sloppy after a while so I added flanged bearings to the steering plate and Kyosho bolts that are longer than the stock CEN screws and allow you to add a lock nut which really tightens up the steering. Spektrum rx with telemetry. Well I think that's it, if you have questions let me know.



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Old 09-22-2007, 04:52 PM   #2
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the two fuel tanks is sweet good job man
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Old 09-23-2007, 03:53 AM   #3
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yeah i like that fuel tank idea... may try that on my firestorm.
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Old 09-23-2007, 12:47 PM   #4
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Seems like too many "hopups" for a high end kit. However, Id never put 2 fuel tanks in my vehicle unless it was race legal...Ill stick with Losi, Mugen and Xray....
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Old 09-24-2007, 11:54 AM   #5
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Do you race it with both tanks, or is that just your 'Bashin' setup?

Looks like a fun rig!

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Old 09-24-2007, 01:54 PM   #6
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You can't race with 2 tanks. The stock tank with 1 filter and 10" of fuel line is exactly 150cc - the maximum allowed for racing.
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Old 09-24-2007, 02:44 PM   #7
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I just added the 2nd tank recently to get a little more run time during practice sesions on non-race days. As Gene mentioned it is illegal to run more than a 150cc fuel tank in a truggy for racing in sanctioned events. As I stated the tank/bracket is held on by two 3mm cap screws located just next to the tank (top/inboard side) and can be removed in 30 secs. So when I race the tank comes off.
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Old 10-03-2007, 05:56 AM   #8
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Quote:
Originally Posted by rezenclowd3 View Post
Seems like too many "hopups" for a high end kit. However, Id never put 2 fuel tanks in my vehicle unless it was race legal...Ill stick with Losi, Mugen and Xray....
its a RTR kit upgraded, but thanks for coming out,
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Old 10-03-2007, 11:46 AM   #9
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Thanks for this thread, i have been on here shopping for a new truggy and Cen has been the one im leaning towards. So this was very helpful.
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Old 10-03-2007, 01:41 PM   #10
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After 9 months the truggy is still going strong. I practice race at least 8 hours every week. This time is shared between my 1/8 buggy and some brushless cars, but the truggy gets the most action. In the 9 months since I have had the Matrix TR here is what was replaced/broke:
  • Original motor (CEN) - replaced with XTM 457 after metal shavings damaged the stocker, using an OS 203 air filter.
  • Spur - replaced after 6 months, normal wear
  • CNC steering bell - replaced with stronger part
  • CNC spindles - replaced stockers, screw pulled out of stock spindle
  • Piggyback shocks - added for more oil capacity
  • RMV springs - replaced, stock springs too soft for my track
  • Tires/wheels - replaced with Pro-line CF & 17mm hubs (lighter)
  • Hickerson diff mod (all 3 diffs) - replaced LSD with open style
  • Replaced servos - 1 stock servo broke after 4 months replaced both
  • Center drive cups - replaced at 4 months, worn out.
  • Rear wing mount - at 4 months replaced broken part
  • Front body mount (plastic part) - replaced broken part
  • Replaced tx/rx with Spektrum system.
  • Clutch bell bearings, shoes, springs - replaced several times, normal wear
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Old 10-04-2007, 05:19 AM   #11
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Quote:
Originally Posted by Machine's R/C H View Post
You can't race with 2 tanks. The stock tank with 1 filter and 10" of fuel line is exactly 150cc - the maximum allowed for racing.

Is it not just the tank that as to be 150cc.Not counting the fuel line or if you run 1 or 2 filters
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Old 10-04-2007, 08:49 AM   #12
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The tank, fuel line, and filters have to be less then 150cc.

For buggy, 125cc. The Matrix buggy tank is about 119cc, but with fuel line and 2 filters, it is 125cc exactly. If you are at 126cc, you will be disqaulified just like the TQ was at the 2004 IFMAR Worlds in Sweden.
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Old 10-04-2007, 09:41 AM   #13
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CEN Matrix vehicles are quite good for the money you pay. If it wasn't for frustration with Nitro engines and the fact I didn't know much about the whole 1/8 scale buggy electric conversions, I would have kept mine.

I was very impressed with the CEN Matrix TR RTR version, it is one heck of a vehicle out on the track.
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