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Old 02-19-2014, 05:13 PM   #676
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I finally installed the motor and with the 1000W diff fluid (aka 80W shock oil) the motor holds steady when spinning the rear wheels, though I am praying it loosens up on Sunday, otherwise I'll probably go with 30W shock oil if I decide to refill the diff later.

I also tinkered with a custom rear body post mount to fit my Suzuki Swift Sport Rally body (stock NRX-12 body) where the roof is too narrow for the stock posts to line up, otherwise the stock posts would go through the rear side windows...oops!



The added bracket came in at 7.2g... hopefully that won't effect the HCG too much <fingers crossed>

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Old 02-19-2014, 07:21 PM   #677
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@BillDelong

A 21.5t motor would be better suited for the awd minis. Otherwise, to get any speed your pinion will need to be the same size as your spur.
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Old 02-19-2014, 07:48 PM   #678
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Sydewynder, we're fine with the 25.5T SP motor and big ol' pinions and small spurs. We wanted to create a spec class that's not so fast that we're buying tires weekly.

Bill, don't get centistoke (cSt) confused with SAE oil weight. They are two different units of measure. Centistokes and centipoise are true units of viscosity. To complicate things further, RC oils vary from manufacturer to manufacturer. 1000W = 1000W. 80W does NOT = 1000W. It just happens that Associated 80W measured out to 1040 cSt on a rheometer.

http://www.twf8.ws/php/tip/shock.html
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Last edited by Rodarbal; 02-19-2014 at 08:15 PM. Reason: Added link to actual test data from a rheometer
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Old 02-20-2014, 06:21 AM   #679
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RJ, that's a great link, nice to know the etymology of silicone diff fluids... and yet another reason to dislike SAE measurements with so many variances between brands like that it's just plain silly... cSt FTW!

Tommy, I finally wired up the electronics this morning and broke in the diff for a few minutes while holding each rear wheel in 30 second intervals. The diff loosened up a little, but it's still tighter than I prefer with the 1000cSt fluid... I'll give it a shot this Sunday but I have a feeling that somewhere between 50W-60W is probably going to be the sweet spot.
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Old 02-22-2014, 12:45 PM   #680
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All painted up with my standard race scheme and ready for some action tomorrow!

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Old 02-27-2014, 07:49 AM   #681
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The car was extremely twitchy when I first tested it... I had WAY too much steering and had to dial back the EPA to around 60%, after I dialed evrything back, then the car felt very smooth overall but would tend to spin out on hard acceleration coming out of a tight corner... I think I'm going to work a little more on the rear diff. Tommy mentioned that he sanded the edges of the slots for the diff cups to allow a little more space so the out drives could spin freely without any binding. Other than that, the car tracked straight as an arrow and was very predictable in the sweepers. It handles very much like my TC6.

I was also very impressed with the RIDE (3027 / 3025) tires, after 10+ min of practice, there were no signs of wear and they were just as hooked up as the USGT spec tire equivalent.

Unfortunately I didn't get to race because the other 2 drivers (RJ and Tommy) broke their cars during practice

I'm fairly convinced that a custom Kydex bumper is a must for added durability of this car.



I'll be happy to sell a custom bumper for $15 shipped within the US
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Old 02-27-2014, 07:49 AM   #682
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Last edited by billdelong; 02-27-2014 at 07:50 AM. Reason: dup
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Old 03-02-2014, 11:13 AM   #683
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For sale Lipo Edition

http://www.rctech.net/forum/r-c-item...ies-250-a.html
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Old 03-13-2014, 02:07 PM   #684
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If anyone has and extra VM2 lipo version around a looking to trade i have a TLR 22t with maybe 5mins of practice on it. Would be willing to do roller for roller or possibly more. PM if you have anything in mind.
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Old 10-01-2014, 05:34 AM   #685
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Have to sell my Atomic VM II, folks. If anyone is interested, here's my ad here:
FS: Nearly New Atomic VM II / VM2 M Series with Accessories
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Old 11-16-2014, 03:12 PM   #686
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Looks like you can change the wheelbase just like the Cup Racer or the TOP Racing Sabre?
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Old 11-21-2014, 07:13 PM   #687
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Im stuck in the build of my vm-II.
The silver stud ball will not fit the screws.
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