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Old 12-01-2010, 08:23 AM   #9781
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I'm getting conflicting information locally... I'm under the impression that the Final Drive Ratio is supposed to be 4.0 on VTA cars. What are most running? My TC3 with the 25.5 is running exactly at 4.0 using a 50 pinion and 80 spur.

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Old 12-01-2010, 08:24 AM   #9782
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There is no mandatory FDR on Trans Am cars, but for a 25.5, 4.0 is a good place to start.
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Old 12-01-2010, 09:23 AM   #9783
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I found them to be usable, but a massive PITA in most chassis I ever used them in. Not my first choice, when everything else out there is much smaller in footprint now.
Here are links to some of our accessories that may be helpful in making your Novak spec esc more compact:

GTB (Orig) Cooling Plate

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GTB 2 Low Profile HS

Lightweight Power Trans-Cap Module - 2S LiPo
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Old 12-01-2010, 09:40 AM   #9784
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It's not the height I have an issue with, it's the footprint.
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Old 12-01-2010, 09:45 AM   #9785
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It's not the height I have an issue with, it's the footprint.
Are the footprints of other USVTA-approved escs a lot smaller?
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Old 12-01-2010, 09:46 AM   #9786
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Old 12-01-2010, 09:50 AM   #9787
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Are the footprints of other USVTA-approved escs a lot smaller?
Not tremendously smaller, but the Cirtix is small enough that it makes a difference to me to wait until they are available again.

And even in non-USVTA ESCs, you have no options that are smaller than the Kinetic, do you?
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Old 12-01-2010, 09:55 AM   #9788
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Not tremendously smaller, but the Cirtix is small enough that it makes a difference to me to wait until they are available again.

And even in non-USVTA ESCs, you have no options that are smaller than the Kinetic, do you?
Not yet.....
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Old 12-01-2010, 09:59 AM   #9789
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Not yet.....
But something significantly smaller in footprint is in the works?
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Old 12-01-2010, 10:13 AM   #9790
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But something significantly smaller in footprint is in the works?
Stay tuned....if I say more I will be 'disappeared"....
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Old 12-01-2010, 10:13 AM   #9791
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VTA Enduro....OMG!!!!!.....

oh my gosh...I bet some southern guy has done a couple of those recently...hummm.....looking for another real soon...

maybe Rob and Eric can add it into next years Nats?
.....
Enduro at the Nats would be cool!
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Old 12-01-2010, 10:15 AM   #9792
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We have had some guys wanting to run 27T with a 2s lipo and we have pushed their FDR Up into the 7 range to try and make it similar. The only real issue is they have got loads more torque but since we only allow simple green for tires the traction is quite low which a softer motor is better.


For those running a standard traction compound it will be an issue. I would say a 1S lipo might be tried with unlimited gearing but again that is getting away from the keeping things standard purpose to this class

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2s/27 turn is about the same as 17.5 on the very early, NO BOOST, brushless speed controls.

I used to run a 27 turn for fun at my local track in RCGT over a year ago. It was fun while it lasted.... and then performance dropped off and i went back to brushless.

I guess the real question you should pose to your club members is why do they want to hold on to old technology? Brushless motors last pretty much forever with little to zero maintenance. Their power and efficiency BARELY drops off over time.

Now that 25.5 is the brushless motor of choice my club discovered that we could run two and sometimes three 5 minute qualifiers back to back (to back) without charging and with minimal loss of performance.

I understand change can be scary for some, and maybe it's a money issue since 27 turn motors can be had dirt cheap. But brushless is very, VERY nice.
Here in the Tidewater area of VA, we've been running a "Muscle Car" class based on 27T brushed with a 2S lipo, spec Jaco Blue (favored for indoor carpet/ useable on the outdoor asphalt) or the true VTA spec tires (favored for outdoor) mostly because so many people had some older chassis/hardware and motors and wanted SOMETHING to be able to use 'em up in. Also, it provided an intermediate step to VTA while the VTA rules were in flux. Now that VTA is accross the board 25.5, we may see a shift either to true VTA or over to 17.5 limited timing RCGT.

Other than wearing out all of your old equipment, there's really no good economic reason to START a 27T class. On the surface, it seems like it's a cheaper set up, but brushed motors require CONSTANT maintenance (for example:a comm lathe, brush cutter, alignment tools) and replacement 27T armatures are getting harder and harder to find, as well as brushes. Even if you don't get the tools to make a 27T competative, by the time you've gone through a few burned motors for being 2 teeth off and sacraficed your race entry fees, you'll see that the initial investment of $150ish for a brushless set up is the best bargain going. Source higher quality slightly used components, and it's a no brainer.

As an unfortunate side effect, our 27T/2S is our starter/slow class, which has it's good and bad points. I'll admit, it's about as fast as a non-boosed 17.5, and there's tons of torque available. It's the motor issues that's the killer (if you want to stay competative).

The point about brushed vs. brushless maintenance and durability is well taken. If you have to go brushed, work it out to have a line in the sand where that class switches to brushless (probably about the same time that EVERYONE but the last few hold outs runs out of new 27T armatures to rebuild their motors!).
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Last edited by Buckaroo; 12-01-2010 at 10:34 AM.
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Old 12-01-2010, 11:12 AM   #9793
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Originally Posted by IndyHobbies.com View Post
I'm getting conflicting information locally... I'm under the impression that the Final Drive Ratio is supposed to be 4.0 on VTA cars. What are most running? My TC3 with the 25.5 is running exactly at 4.0 using a 50 pinion and 80 spur.

Scott
There is no FDR limit.
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Old 12-01-2010, 01:44 PM   #9794
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I'm getting conflicting information locally... I'm under the impression that the Final Drive Ratio is supposed to be 4.0 on VTA cars. What are most running? My TC3 with the 25.5 is running exactly at 4.0 using a 50 pinion and 80 spur.

Scott
I ran a 3.6 final ratio. My son ran a 3.4 and was 3rd qualifier last Sunday. (Silver Cuda) And there is no FDR limit.
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Old 12-01-2010, 09:39 PM   #9795
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Im running a TC5 and all my stuff is nice and neat in there with my Havok Pro....no stacking the rec on the servo....all eletronics are flat and laid neat....my Havok takes as much space as my SPX or my Tekin RS...when I switched out esc's...I didnt move anything else around....

just my $99.99 worth

Havok/GTB.......ESC Footprint: 1.16” x 1.49” (29.5 x 37.8 mm)

LRP SXX..........Dimension: 30.5x34x16mm

LRP SPX...........33.1x37.6x14.9mm

Tekin RS...........Dimensions: 1.3 x 1.00" x .45" (33 x 25.4 x 11.5mm)
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Last edited by DARKSIDE; 12-01-2010 at 09:52 PM.
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