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Post by dave632 on Mar 3, 2018 20:28:22 GMT -7
Started a wet brush test using an AFX chassis with a mean green arm. With stock copper brush + comm lube it ran .676 @ 20 mph with the wet brush it ran almost the same ET at .673 but MPH picked up to 22. Sparks were shooting out of the car at times and the 60' was slightly slower with the wet brush. I used 2.5mm braid with comm lube and simply stuffed it into the AFX brush holders. I took it apart after a few runs, notice that the comm was NOT burned up as I expected. In fact it looked better than it does when using regular brushes as it was shiny as if you had polished it. Might need to do a little more testing with this setup in an unlimited.  Wet brush
 Wet brush times |
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Post by AJR on Mar 4, 2018 4:17:27 GMT -7
That looks good. I always like to see your testing sessions! Interesting results as well. I would be interested in the unlimited application too. I've never run that set up....for one, it's too messy. Hey Dave I'm not looking for things to complain about or change in the rules. In fact, I don't like when people are always questioning rules, etc. But these things came up in my race and I thought they should at least be talked about. I think you said it the best in our group PM....this type set up is best kept to unlimited and silli foams in Super Comp and Unlimited. I agree with that. Kiwidave also made a good comment.....Comp is a step up from stock for the new builder. All they have to do is change the arm and add braids to their stock build. Silli foams and wet comms don't really have a place there. Thanks and look forward to more tests. I may throw together my own 3 gear "Frankenstein" for some testing....lol.
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Post by gnome on Mar 4, 2018 6:36:22 GMT -7
I myself have yet to play with any comm lubes at all ,interested in seeing more testing on this.didn't know thier were rules on the brushes in any classes. If you all could clarify so i don't get labeled a cheater by accident. As far as rules go seems to me you guys have done a great job on forming a class for everyone at every level. You make the rules I'll look for a way to bend them. Ha ha i wanta go fast
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Post by AJR on Mar 4, 2018 9:32:55 GMT -7
I myself have yet to play with any comm lubes at all ,interested in seeing more testing on this.didn't know thier were rules on the brushes in any classes. If you all could clarify so i don't get labeled a cheater by accident. As far as rules go seems to me you guys have done a great job on forming a class for everyone at every level. You make the rules I'll look for a way to bend them. Ha ha i wanta go fast No worries...no labels. We are working on clarifcation in some areas. |
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Post by ecbill on Mar 4, 2018 10:08:46 GMT -7
Comm lube is something I have been curious about and had been considering starting a tread asking about it. Was wondering if there were advantages and disadvantages to using them.
Would like to hear opinions from more experienced drag racers.
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Post by dave632 on Mar 4, 2018 12:13:17 GMT -7
I have used comm lubes at different times. In general they usually help performance but they only last a couple of runs. This is why you see some cars TQ or run their best times then fall off after a few runs. I find they help pancake chassis more than inline, not sure why but I think the larger brush contact area is helped by the lube more.
Gnome I have been trying to go faster since I started racing in any shape or form even as a kid on my bicycle. I remember hitting over 40 mph on my bike going down hill and then trying to stop for a red light which I could not do. Fortunately the oncoming driver saw me and did not go forward.
JJ if you build another Frankenstein we can have a monster match race!
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Post by gnome on Mar 4, 2018 14:30:42 GMT -7
Funny you mentioned Frankenstein, just came up to eat lunch from working on beater bomb old beat up t jet runs fair.if there is room. .. what kind of motor mag you running?
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Post by dave632 on Mar 4, 2018 15:39:54 GMT -7
Stock type ceramic magnets which are available from Dash. Not neo magnets.
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Post by dave632 on Mar 6, 2018 10:03:01 GMT -7
Next step was to run a modified armature with poly magnets. This was done to Frankenstein when it came back from Jeff's race after blowing a gasket. In earlier tests it had ran .41 @ 31 Mph after putting in wet brushes .39 @ 37 Mph. Seemed to make a bigger difference with the hotter arm. Very little or slightly slower in the 60' department, don't know why that is. On the second pass I also added shunts. This made only a slight difference adding about 1/2 mph. That is generally the difference I have found with shunts, very little if the pickups are good.  Frk wet brush 1
 Frankenstiein wet brush 2 |
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Post by gnome on Mar 6, 2018 11:48:41 GMT -7
Wow that little bugger gets it what typ of brush you running. My beater bomb saw the com separate from the arm yesterday during testing. Trying to keep up with you is asking a lot from these cars.the time slip post help me judge how my cars are running. Did the car start ro fall off and if so when.
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Post by ecbill on Mar 6, 2018 15:10:11 GMT -7
Gnome,
Comparing your times to Dave's posted test times is a very useful. Something to keep in mind is that my cars consistently run faster on Dave's track than my own. There have been times where I sent cars to Tenn. thinking they were going to be clobbered but they ended up being competitive. You may find similar results.
The times for the cars that went to Texas also ran better than at home.
Bill
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Post by dave632 on Mar 7, 2018 13:45:07 GMT -7
My track is faster than most mainly because there are 2 30 amp power supplies one for each lane. I also ran 3 #10 inputs, one at the start, one in the middle and one at the end. The Max Trak also makes the cars a little quicker and faster. The power is also applied by relays which cut down any loss thru a controller. Every one of the things I mentioned made all of my cars, even stockers, run quicker and faster. The 2 big power supplies made the biggest difference. Whenever I send my cars elsewhere they run slower, even the 14 ohm stockers. I think if I put 2 12V batteries in series and keep them fully charged some of my cars will go thru the wall. Cars running that setup have hit over 100 mph.
The brush in the little monster is now copper braid stuffed into the brush spot along with comm lube.
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Post by dave632 on Mar 7, 2018 18:42:20 GMT -7
T jet running even better now hitting almost 39 mph in .376. In this match race the other car is an AFX chassis with a hot arm. It usually hits upper 30s but was not running that well here. This aint over yet.  AFX vs T jet |
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Post by gnome on Mar 8, 2018 8:00:31 GMT -7
Was the original dry test run on dry braids? I've been playing with niped sg+ springs dry they have to be broken in on low volts and the wheels con not be spun back wards. I like the braid idea .have some mags and a chassis coming. Will check in on smokey mountain thread.
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Post by dave632 on Mar 8, 2018 8:46:25 GMT -7
Never tried the motor brush braid dry. I think the com lube helps keep the com clean. Every time I take a pancake motor apart the comm is always discolored from the standard type brush. With the braid as a brush it comes out shiny. Personally I thought it would fry the comm.
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