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Old 12-04-2005, 07:09 AM   #2011
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I hear that the 4499 brushes will give you a little more punch then the 767's but must be changed more frequently is this true? And is so after how many runs should the brushes be changed?
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Old 12-04-2005, 11:08 AM   #2012
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Quote:
Originally Posted by teamgp
Some interesting results from yestedays race.

I freshened up the two Brood blueprinted motors (monster and p2k2) and shaved the leading and trailing edges of their new 767 brushes (with no hole this time) down to 1.7 width to match them to their comm widths according to the "scientificus formulaeus" above. The previous brushes were 769's (with holes) that were shaved down to a 1.9 width in the post above. The gearing changed slightly on both.

With the monster my avg lap times were off by one or two tenths, but the power was pretty consistent all the way through to the last lap where it only dropped .15 from my fastest lap time. However, it came off the track a little hot at 204F.

The p2k2 was another story. I had my fastest run (knocked off five seconds) and lap of the day which was only .06 off my record lap time. It came off the track at 177F.

Then I reverted back to my old self and idiotically decided to use one of my buddy's prime motors in the main, instead of sticking with the proven p2k2. Don't get me wrong, he (the Ikenator) does great "personal" motor work and after testing it for the right gearing, it was faster down the straight and had great pull out of the corners. However, it just didn't squirt me out of the corners as fast as the p2k2 and you could see the power fading the last couple of laps. I ended up loosing about a tenth on the average lap with it compared to the p2k2. Considering that very few passes are attempted at the end of the straight where your entering a tight chicane and pileups are frequent, I should have stayed with the Brood p2k2 power and increased the rollout by .5.

In reflection, I think the p2k2's spinup and efficiency are deceptively fast, whereas you think your going slower and are actually going faster. You can gear it to the moon as well.

I'll have a lot more tuning info later this week, as my dyno buddy (aka "The Mad Scientist" in electric drag racing circles), the Ikenator and I will be devoting half a day to tuning a stable of stock and 19t motors in preperation for the upcoming North/South Shootout race in NC. We'll be comparing dyno results from a CE 45, three fantoms (one older and two newer) and the little ol Orion. We'll definitely be playing with brush shaving/holes and such.

Thanks for the info "CJ", your cover is blown.
Cool dude. Glad to hear your at least experimenting with it. Like I said, it may not work as well in all situations. Just have to figure it out. But at least its something to have in your "tuning" back pocket.

I'm gonna do another experiment today with a br00d Monster. Moohahaha
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Old 12-04-2005, 03:30 PM   #2013
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Quote:
Originally Posted by Killa G
I hear that the 4499 brushes will give you a little more punch then the 767's but must be changed more frequently is this true? And is so after how many runs should the brushes be changed?
Is that true EddieO/others?
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Old 12-04-2005, 07:04 PM   #2014
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Hi Eddie, are you will be offering the Power Trix plus Center Cut armatures in the near future? Thanks
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Old 12-04-2005, 07:08 PM   #2015
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Center-Cut Powertrix arms are currently in testing......we will see....main problem is it will be a fairly pricey arm.....more than a whole motor....

As for 4499 and 767.....I think they are very similar brushes....I think the 4499 will give you a little more RPM, while a 767 will be a little more torquey....breakin time is about the same...as for wear, the 767 usually will last a little longer, but its a small difference....

You can run a brush for many runs, it all depends on the length....just make sure you adjust spring tension as the brush gets shorter and the comm gets smaller.....

Later EddieO
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Old 12-04-2005, 07:38 PM   #2016
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Hi Eddie,
what do you think about the Reedy 728 and 729 brushes? for 4 cell 1/12 Reedy Pt Motor. What's the pros and cons of each?
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Old 12-04-2005, 07:43 PM   #2017
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I never use the 728, though I know some of the Reedy guys do.....the 729 we use all the time in the Ti....in both 1/12th scale and Touring Car.....when we won snowbirds.....was a Ti with 729 brushes, full face....

Later EddieO
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Old 12-04-2005, 08:56 PM   #2018
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We are running a special on the 1.20 IB3800 Packs.....

Super Stock 380+ 1.2+ $59.99!!!

Super Mod 400+ 1.2+ $64.99!!


4 cell stuff 1.2+ on sale too....

I don't have a ton left, so you better move on it fast.....

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Old 12-04-2005, 09:20 PM   #2019
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I have some batteries on the way and was wondering your recommendations on charging. thanks
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Old 12-04-2005, 09:26 PM   #2020
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6.5 Amps .02 Peak detect for stock or 19t.....6 amps for modified.....

After you run....discharge to .9 per cell (5.4 6 cell, 3.6 4 cell) at 30 or 35 amps.....let them cool down completely if you want to run them again that day. Tray them before you charge them again till the lights go out...


Later EddieO
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Old 12-04-2005, 09:31 PM   #2021
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Eddie,

I use my LRP Pulsar 2's to discharge my IB's at 10amp until 5.4v for the pack. What tray do you recommend before charging for your IB's? I've heard it's not recommend to take the cells below .9 per cell like most do with the GP cells.
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Old 12-04-2005, 09:45 PM   #2022
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I use the much more trays.....the integy or trinity trays will work also....

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Old 12-04-2005, 09:53 PM   #2023
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Quote:
Originally Posted by Anthony.L
Eddie,

I use my LRP Pulsar 2's to discharge my IB's at 10amp until 5.4v for the pack. What tray do you recommend before charging for your IB's? I've heard it's not recommend to take the cells below .9 per cell like most do with the GP cells.
this one works great....

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Old 12-05-2005, 03:31 AM   #2024
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EddieO ygpm I have another question for ya.
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Old 12-05-2005, 06:38 AM   #2025
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EddieO,

What should I do if I am to use the pack of IB's once a month (race use only)?
Should I store them with charge or just equalize them to 0.9V per cell after last run and store them until the next run (which maybe 1 month later)?
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