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Old 02-17-2007, 11:00 PM   #1
Gump
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Help! Brushless for dummies (like me)


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Brushless newb needs advice:

Going to the Ontario Indoor Championships and I'm trying to figure out what to do for batteries and gearing for my XXX4G+ so that I'm not left behind on the straight, or left dumping at 4 minutes and 23 seconds.

I'll be running the following:
XXX4G+
MambaMAXX 5700
3300 NiMh 7.2v
All size spur's available
Pretty much all size pinions available

The reason I'm so lost on this issue is because I've only been running around r/c niagara with a 19turn quad mag and a big old spur and a tiny little pinion doing 11 second laps - never ran the car anywhere else, and definitely need some advise.
Any help is greatly appreciated!
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Old 02-18-2007, 12:08 AM   #2
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i dont think anyone will know till they go see the track and try it out
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Old 02-18-2007, 08:58 AM   #3
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surely someone must have an idea as to weather or not a 3300 will last 5 minutes with a 5700 brushless and what area to start with for pinions and spurs.
Was anyone running a 5700 at sids, for example? were they just putting in a 12 tooth pinion with the biggest supr they could find?
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Old 02-18-2007, 09:00 AM   #4
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Hi Gump,
OK, did some digging around for you.
The Mamba Max 5700 is somewhere between an 10 and 12 turn brushed equivalent.
With that in mind, I would start with a 20 tooth pinion if you are using a 96 tooth spur.
You would normally start with an 18 or 19 tooth pinion, But.......
The track should be high grip knowing Matt . It will probably be fairly open for 1/10 scale, since 1/8 scale is also running.

The internal drive ratio for the xxx4 is 2.1
So your final drive ratio formula follows as such

2.1 x ( spur divided by pinion ) = final drive ratio

2.1 x ( 96 / 20 ) = 10.08 final drive ratio

That should get you started. After a couple of practice laps you will know if you need to go up or down.
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Old 02-18-2007, 09:07 AM   #5
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Quote:
Originally Posted by Gump
surely someone must have an idea as to weather or not a 3300 will last 5 minutes with a 5700 brushless and what area to start with for pinions and spurs.
Was anyone running a 5700 at sids, for example? were they just putting in a 12 tooth pinion with the biggest supr they could find?
The 3300's should make the 5 minutes OK, provided you don't overgear it.
Don't run 23 or 24 tooth pinions.
Start with the 20 I mentioned, and decide from there.
If you make the time with some juice to spare, and, you feel you can use more speed go up one or two teeth and check your time again.

There isn't a definate answer until you get on the track, but this should get you on your way.
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Old 02-18-2007, 12:34 PM   #6
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look at it this way, 3300's used to be the biggest batts you could get, and people were using them with low turn brushed mod motors, so if anything, they will last longer with the brushless, its all gearing and being smooth on the trigger,
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Old 02-18-2007, 12:39 PM   #7
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It looks like others have given some useful info.

I would add, make sure the drive train in your car is free running.
Check how smoothly the drive train feels without the pinion installed on your motor by rolling the car, turning the wheels by hand, etc...

This is very often overlooked and is sometimes the cause of:
- Motor over heating
- ESC over heating
- Premature battery drain
- Unnecessary wear and heat

Check bearings, belts, bent shafts, etc....
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Old 02-18-2007, 12:42 PM   #8
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Quote:
Originally Posted by bobf24
look at it this way, 3300's used to be the biggest batts you could get, and people were using them with low turn brushed mod motors, so if anything, they will last longer with the brushless, its all gearing and being smooth on the trigger,
Exactly......
Also, I used GP 3300's in my B4 at SID's for some races. I was using a 13x2 and had no problems running 5 and 6 minutes.
Granted, the B4 does not have the drag of the Belt drivetrain in a 4wd, but there should not be a problem.
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Old 02-18-2007, 11:13 PM   #9
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Thanks for the useful info gentlemen - seems I should grab a couple in between pinion sizes for this event, just to make sure I'm not falling short. Glad my batteries should not be an issue!
The drivetrain check is a valuable lesson - one I already learned early on this season when I incorrectly reassembeled my tensioner. Needless to say, the car is in check in that department at this time!
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Old 02-19-2007, 09:01 AM   #10
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Obviously you wont be using reverse at a race but make sure you leave it disabled even if you are bashing.
every time you grab reverse the belt derails
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