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Old 10-21-2001, 10:51 AM   #76
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does ne one know what roars rules are on brushes? can u use stand up brushes on a stock motor?
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Old 10-21-2001, 02:12 PM   #77
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I don't think there are brush rules, however you can't change the endbell on a stock motor so I guess you can't??
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Old 10-21-2001, 02:16 PM   #78
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i jsut changed the brush hoods not the endbell....?
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Old 10-21-2001, 05:41 PM   #79
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what do you think of the trinity midnight 2 pro
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Old 10-21-2001, 05:48 PM   #80
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That would still be considered modifying the endbell (again I think) ...my understaning is if you do anything other than turn the com and put different brushes/springs on that you will not pass tech inspection.
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Old 10-21-2001, 07:07 PM   #81
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Quote:
Originally posted by futureal

I ran the P2K2 with a 21T/88T combo in the XXX-S. Before running (and per mr.losi's advice) I broke it in at 2V for 10 minutes, trued the comm, replaced the factory brushes with nicer slotted ones, and then ran another 3 minute break in at 2V.

Overall, my first impression is favorable. Will race with one this weekend.
Hi, I am new to this forum. My question, futureal, is this a very tight track that you were running on? Because I see that u used a 21 tooth pinion. I also have the xxx-s with a p2k. I am very new to the TC world. So I will be asking many stupid questions...lol Last week was my first race, and I just couldn't find the right gearing. I run on a indoor carpet track. It was kinda tight. 4 switchbacks right in a row. And 2 small straights, maybe 50 ft long. I am running Treadz foams, trued to 59mm. I was running a pinion of 27. Was that too high?
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Old 10-21-2001, 09:14 PM   #82
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Wow, yea a 27T pinnion with almost any motor on the XXX-S (stock spur) is going to be overgeared. The first thing to know is how to calculate the FDR (Final Drive Ratio) for your car. The formula is:

[(teeth on spur) / (teeth on pinnion)] * internal drive ratio

On the XXX-S, the internal drive ratio is 1.83 (write that down!) so your 27T pinnion produced a gearing of:

(88T/27T)*1.83 = 5.96

Around here, we typically gear our stock motors in the 6.5-7.8 range. We run on a somewhat open carpet track, it's not huge but it's not really small either. Personally, I try and run a pretty conservative ratio whenever I can, since it not only extends the motor life but often times makes the car easier to control. If you are running a tight, techincal track, I would gear your P2K in the 7.3-7.8 range. On a Losi XXX-S, this translates to a 20T, 21T or 22T pinnion. Also remember that many factors influence speed, and gearing up is NOT always the answer! On a smaller track, the quicker acceleration you'll get from a more conservative ratio will actually help a lot more than top speed.

Today, I ran a P2K2 with a 21T pinnion (7.69 FDR) and I was plenty fast on our track. For the main I swapped in an older P2K and geared it up to a 22T (7.32 FDR). It made a difference, but it was not night & day. With a properly taken-care-of motor, you should be fine running somewhere in these ranges.
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Old 10-21-2001, 09:25 PM   #83
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I will add something to my post...

When you are running on a wide open track (e.g. outdoors) it is common practice to gear much higher. a 27T pinnion on a P2K on an outdoor circuit would not be outrageous. Once again, it depends on the track, on your driving style, and on how well you take care of your motors. The taller the ratio, the more stress on your motors, and the more time you will have to put into maintaining them.
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Old 10-21-2001, 09:39 PM   #84
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I was running a 22 tooth pinion with the 88 spur, with a P2K and 58mm foams on a medium tight carpet track. I asked a local fast racer who runs the XXX-S and he told me to run a 27 or 28 tooth pinion.

To confirm, I asked Todd Hodge and he told me to go for a 28 or 29 tooth pinion with the 90 tooth spur and he used to race at my track before he moved to Cali.

I have not run this yet so I will give it a try. With my TC3 and P2K I used to run a 24-26 tooth pinion with the stock 72 tooth spur.
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Old 10-21-2001, 09:54 PM   #85
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when you are cutting your com, what kind of oil if any do you use before you cut it?
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Old 10-21-2001, 09:57 PM   #86
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Yup, I'm on tight carpet and I'm at 7.54 FDR for my P2K, and an 8.12 on my GM3
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Old 10-22-2001, 12:26 AM   #87
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While I'm not saying that running an insane gear ratio (e.g. 6.0) with a P2K on a carpet track is impossible, I'm just saying that I don't see the need. Speed does NOT come entirely from your gear ratio!

Similarly, unless you are one of the "fast" guys at your track, I don't think you need to be thinking about super top end speed. Concentrate on becoming a better driver first and foremost, and worry about top speed later on. Having an ultra-fast car won't amount to anything if you're not in complete control of it.
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Old 10-22-2001, 06:54 AM   #88
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Speedo- Is you carpet track tight and technical or pretty open? Mine is pretty open and I am running a GM3 geared 88 / 24.

Thanks

Mike Webb
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Old 10-22-2001, 07:40 AM   #89
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I gear more for acceleration and not speed. 80% of the lap time is spent in the infield and my track owner likes to mix it up each week with a new and creative ( I think he likes to torture us with the tight layouts ). With the Cleveland Indoor Champs coming up, lot's of awesome carpet racers are visiting my local track. I saw Mike Blackstock race and he is really fast. And it wasn't just those factory provided motors and batteries. He was able to drive the hell out of his TC3.

I guess I will experiment with the gear ratio and measure it with a stop watch to see which gives consistently better lap times. I'll start with a 23 tooth and work my way up to a 28. I'll let the motor cool between runs and check the brushes. I do not want to overheat my P2Ks and kill my equipment prematurely. I spend enough money on this hobby and I don't want to spend more if I don't have to.
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Old 10-22-2001, 08:24 AM   #90
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Thanks futureal! I will be putting your advice into effect on Wensday night.
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