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Old 08-30-2006, 08:45 PM   #15421
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Originally Posted by drew85
I heard there is something that had to be filed down on the MR car, like block?? true...
Yes...2 areas...

1st the delrin outdrives for the spool

2nd, the most painful, the blue alu steering parts...

This is the 1st time, I've got to shave metal off....!
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Old 08-30-2006, 08:53 PM   #15422
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Why does something hit?
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Old 08-30-2006, 09:30 PM   #15423
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Originally Posted by drew85
Why does something hit?

The edges cliamed by Tamiya will hit the belt. So they say its safe to shave a little off there...
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Old 08-30-2006, 09:49 PM   #15424
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its talking about the steering arms, they can get very close to the belt.

i havent filed mine yet, i figured id look after a few weeks, and see if it is rubbing. nothing after 2 weekends of running...
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Old 08-30-2006, 11:04 PM   #15425
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Originally Posted by Turbonium
its talking about the steering arms, they can get very close to the belt.

i havent filed mine yet, i figured id look after a few weeks, and see if it is rubbing. nothing after 2 weekends of running...

Darnn...!! I've done all those shaving and grinding for nothing?!~


By the way, does the TA05 centre and front one-way fit the MRE??
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Old 08-31-2006, 06:49 AM   #15426
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Originally Posted by xtrememadness
rick is correct. i just checked my 4mm chassis and the new steering rack wont fit. i agree with carl you dont really need the new rack on the rug. i got alot of slop out of my msx steering with a couple of shims. if you run 7 turn mod motors like mark r you could probably use all the steering you can get. i only run stock and 19t and i have more steering than i need. just my $.02 cents.
xtrememadness,
What carpet tracks you are you racing at? If, Horsham R/C is one of them, when will you be going there? Maybe, we bounce some ideas off of each other?
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Old 08-31-2006, 06:59 AM   #15427
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Quote:
Originally Posted by Ben.C
Darnn...!! I've done all those shaving and grinding for nothing?!~


By the way, does the TA05 centre and front one-way fit the MRE??
Still, prefer to know that mine won't hit regardless

And No the neither the TA05 front or centre one-way will fit. Centre one-way won't as the belts are the other way round (Front belt is on the right on the '05, on the left in the 415), and the front oneway is also offset to the right, and not central.

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Old 08-31-2006, 07:01 AM   #15428
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Originally Posted by TryHard
Jay,
It was the HPI / HB arms for deffiently. Basically, the arms are have the pin holes closer, which is ment to be better on carpert (one of the reasons why most of the TRF team liked to use the old 414 style suspension on carpet).

Now, given Tamiya have released the short arms... which are 0.5 and 1 mm shorter than the std LWT arms, and 0.5mm longer (at the pin holes) than the HPI arms... coincidence, doubt it

(HPI arms F= 53.0mm, R=53.5,
Std LWT F=54.0, R=55.0,
Short LWT F=53.5, R=54.0)

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TryHard,
What's the part number on the new Short LWT arms?
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Old 08-31-2006, 07:29 AM   #15429
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Quote:
Originally Posted by TRF415boy
I wouldn't think you'll have enough belt tension by dropping a whole 3 teeth on your pulleys. I'm using 18T pulleys with the TA05 diff/one way pulleys and longer belts to good effect, especially in terms of lifetime of the belts and centre pulleys.
I'll know this weekend...someone asked why I'm looking into this...my response

Does this make sense for you guys...keep in mind I'm racing carpet foams on an tight twisty track...you feedback is appreciated.

This is what I was thinking.

> figure the same 56mm tire size and 102 spur...to get to a total roll-out between 28.3-28.5, probably good for stock on this track

> with 32T diff gears, internal ratio is 2.00 you need a 33 pinion to get roll out of 28.460

> with 35T diff gears, internal ratio is 2.25 you need a 37 pinion to get roll out of 28.364

> so I figure the smaller pinion would give better rip off the corner...not sure if this is true...which is why I asked

If you notice the 35T gears were first seen during the worlds for modified racing.
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Old 08-31-2006, 08:19 AM   #15430
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Quote:
Originally Posted by Carl Giordano
I'll know this weekend...someone asked why I'm looking into this...my response

Does this make sense for you guys...keep in mind I'm racing carpet foams on an tight twisty track...you feedback is appreciated.

This is what I was thinking.

> figure the same 56mm tire size and 102 spur...to get to a total roll-out between 28.3-28.5, probably good for stock on this track

> with 32T diff gears, internal ratio is 2.00 you need a 33 pinion to get roll out of 28.460

> with 35T diff gears, internal ratio is 2.25 you need a 37 pinion to get roll out of 28.364

> so I figure the smaller pinion would give better rip off the corner...not sure if this is true...which is why I asked

If you notice the 35T gears were first seen during the worlds for modified racing.

No it won't change anything, you'll still have the same rollout so same acceleration. To be honest I would use the 35 or 36T pulleys as they'll definately provide better efficiency. The 35T pulleys were first seen on the 415, 32T pulleys were for the 414 series only. Since the very low winds motors started to be used they started using 36T pulleys to have a better gear ratio range, but they also have better efficiency due to less belt wrap.
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Old 08-31-2006, 08:24 AM   #15431
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Went for a little spin today at Cots, ended up on 4.7 on my atlas (blue can) and a one-way . Felt ok, just needs some more turn in

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Old 08-31-2006, 08:28 AM   #15432
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Quote:
Originally Posted by TRF415boy
No it won't change anything, you'll still have the same rollout so same acceleration. To be honest I would use the 35 or 36T pulleys as they'll definately provide better efficiency. The 35T pulleys were first seen on the 415, 32T pulleys were for the 414 series only. Since the very low winds motors started to be used they started using 36T pulleys to have a better gear ratio range, but they also have better efficiency due to less belt wrap.
I agree with your point with respect to the efficiency...something I was concerned with as well...However..the roll-out method is basically a measurement to determine how far the chassis will roll with "1" rotation of the motor. Therefore..."1" full turn of the pinion gear = the chassis will roll 28.5 mm.

So, if you have a smaller pinion..in theory it should enhance the acceleration of a corner...

Real problem I'm having is the lenght of the belts and the most important fact...the white pulleys look too cool.
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Old 08-31-2006, 08:40 AM   #15433
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Quote:
Originally Posted by Carl Giordano
So, if you have a smaller pinion..in theory it should enhance the acceleration of a corner...
That's a misconception, if the rollout is the same then it doesn't matter how big your pinion is you'll have exactly the same acceleration as it is uniquely a function of the rollout (assuming we're not changing the efficiency of the drivetrain, which you're doing with your 32T pulleys but in a worse way IMHO).
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Old 08-31-2006, 09:22 AM   #15434
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Any gains you make on a smaller pinion are squashed by a smaller diff gear, so if the ratio is the same, then no difference in acceleration. As TRF415boy said, you'll gain more in efficiency with the bigger pulleys.

Only reason for changing internal ratios, just so you can use a smaller pinion, is if you using super heavy steel pinions, which im sure your not. the smaller pinion would weight less, which means less rotating mass = better acceleration. The difference in weight of the small pulleys vs the large ones, is basically nothing, so theres no gain in smaller pulleys. Belt efficency would be way more important that rotating mass in this case. well thats the way i see it anyways lol
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Old 08-31-2006, 09:44 AM   #15435
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Carl:

Hi,

I agree with TRF415boy. if the rollout is the same pinion size won't matter. I wonder about the internal ratio of the car though. it seems a higher ratio would be better for stock (everything else being he same). our best stock sedan has the highest internal ratio. having just bought a 415MSX to run on carpet/foams. I have been looking at the TA-05 diff and centre gears for my 415 to raise the internal to 2.25.
also do you guys cut the fronts down at all or just space them out???? I ended up spacing the rims out about .040
so thet won't rub. or do you use a different steering knuckle???
(this is my first Tamiya besides my TA-05. I'm trying to get it ready for Cleveland)

Thanks
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