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Super Tuning a Dynamic RTR


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#1 dc-65x

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Posted 16 June 2008 - 06:51 PM

I'm a firm believer that you can't have too many projects going at the same time :blink: :D . A few days ago this eBay win showed up "drop-shipped" at my front door. My postman will walk up to my front door, release his grasp of my package from waist high, let it fall to the ground, and walk away not even ringing the door bell :rolleyes: . Anyway here's what was in "Da Box":

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I wanted it for the motor but the chassis looked pretty good from the bottom:

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When I took the body off things looked a little worse but not hopeless:

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This area was pretty ugly though:

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I started to wonder how these old GP12s ran. I called Rodney and asked if we had a running example in our S.H.P.B.A.P.S.C.R (Society for the Historical Preservation of Bay Area Pro Slot Car Racing) museum and to my surprise we didn't :shok: . The birth of a new project!

Time to visit our museum's library for period info...

Rick Thigpen
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#2 TSR

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Posted 16 June 2008 - 07:02 PM

Rick,

They run great once you add an axle tube on each end. :)

#3 mdiv

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Posted 16 June 2008 - 07:05 PM

Rick,

Sounds like a great thread! I'm totally interested in hearing and seeing what you do.

You do know what that "silver corroded" area is probably from, correct? If it is what I think it is, I do the same thing to Flexi cars.

Mikey

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#4 dc-65x

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Posted 16 June 2008 - 07:21 PM

They run great once you add an axle tube on each end. :)

Hi Philippe,

That's exactly what I was thinking. ;) :)

You do know what that "silver corroded" area is probably from, correct?

Hi Mikey,

It looks like a "quarter pounder" of solder. :D

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#5 mdiv

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Posted 16 June 2008 - 07:22 PM

Probably from trying to install a wire manager, right?

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#6 dc-65x

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Posted 16 June 2008 - 08:22 PM

OK, the SHPBAPSCR museum library turned up a few things. I found ads starting in 1969 for these RTRs but I liked this one from:

Posted Image

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I especially like the bottom part that says "with Mura Motors". Since I have other uses for the '68 Mabuchi in the car now it will get a Mura two-hole can motor :) .

Further research at the museum revealed this Mike Morrissey "Hop-Up" article:

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OK, super tuning it shall be ;) . But first it's to pieces with the chassis and off to the tumbler...

Rick Thigpen
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#7 mdiv

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Posted 16 June 2008 - 08:41 PM

Attaboy, Rick! Looking forward to this thread - I earmarked it!

Mikey

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#8 sportblazer350

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Posted 16 June 2008 - 09:54 PM

Looks like a perfect project for real vintage Can-Am racing! This car will be legal in our New Jersey vintage Can-Am class! I picked up one of these, with a body, in clear packaging, but it came without a motor... will finish it off when I find a period correct motor... any ideas on where to buy one??

Looking forward to see how you progress with this one. I have a bunch of the Riggen inline and anglewinder flat pan chassis, a few complete RTR cars, and a few repop bodies to make some vintage club racers!! So far I have one "runner" on the track, but it does not take turns too well... tried soldering the drop arm to the chassis, still hops out of the slot if I take corners hard...

Will keep tuning for better performance... any tips??

Glenn Orban
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#9 TSR

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Posted 16 June 2008 - 10:59 PM

Morrissey forgot the all-important axle tubes... check this 1/32 scale Dynamic frame with the tubing added:

Posted Image

Posted Image

:)

#10 dc-65x

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Posted 16 June 2008 - 11:04 PM

We'll put this sucker together and ring its neck at Eddie's and report back on what works and what doesn't. :)

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#11 dc-65x

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Posted 16 June 2008 - 11:05 PM

Right, Philippe. I'll be adding a rear axle tube and piano wire bracing. ;)

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#12 Prof. Fate

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Posted 17 June 2008 - 10:04 AM

Hi,

I have kept mine running for decades.

Besides converting to pin tubes, I soldered up the drop arm to not drop in the day. Added upstops to the pans limiting movement to about .016". The Swedes had published a set of high-speed photos in "Model Cars" in England to analyze what the car was doing in the corner. I convinced a local photo buff to repeat. The short version is that we started really limiting the up part.

The stock wind that came with the car was the ubiquitous 65/30 wind. I never got the car comfortable with more than a 29.

Early Group 12 motor rules were simple, any unbalanced arm. The conventional wisdom was that much more than a 30 wouldn't work unbalanced. A lot of us ran these early Group 12 races with handwound 29s and 28s and static balanced them with epoxy with "contaminants".

Even with the "in the day" rules; 1/16" clearence, 3/4" fronts, 7/8" rears, they made nice racers. They also benefit with adding a .047" wire along both sides of the main section to stiffen the "rails" and it greatly reduces bending in the wall.

Fate
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#13 Fred_J

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Posted 17 June 2008 - 11:42 AM

The Swedes had published a set of high-speed photos in "Model Cars" in England to analyze what the car was doing in the corner.

Rocky,

Would you happen to remember what issue of "Model Cars" that feature appeared in?
Fred Jespersen

#14 dc-65x

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Posted 17 June 2008 - 12:11 PM

They also benefit with adding a .047" wire along both sides of the main section to stiffen the "rails" and it greatly reduces bending in the wall.

Hi Rocky,

My chassis was pretty tweaked so I spent quite a while getting it flat again. I'll be adding piano wire bracing for sure.

Rick Thigpen
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#15 TSR

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Posted 17 June 2008 - 12:20 PM

Rocky,

If you look closely at that 1/32 scale version of it, I not only added the axle tubing, but there is .063" wire formed and soldered inside the whole rear end, on each side.

I also re-hinged the side pans with real tubing. The car handles really nice and won its race at the Bordeaux vintage meet in 2003. :)

#16 dc-65x

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Posted 17 June 2008 - 02:42 PM

It was "tumbler time" and this is what I had to start with:

Posted Image

Look at how much "solder blob sucker" it took to get the drop arm pivot joint cleaned up. They must have used a quarter pound of solder :shok:

I followed Steve Okeefe's advice for tumbling. I used Tide Ultra HE detergent for front-loading washing machines. It's low suds and there was no foam blowing out when I took the lid off. Steve has also not had any more of the corrosion problems we were having with other polishing liquids. AND if you like shiny (shiny is my middle name ;) ) you'll get shiny!

Posted Image

Posted Image

Posted Image

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#17 Jairus

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Posted 17 June 2008 - 03:50 PM

Is this a test?

The pans are backwards on the bottom pic... :laugh2:

Hey, I got a nice stock version of that car. My first slot car actually...

Posted Image

Also have nice chassis that is waiting for the same treatment you are planning: BULLETPROOFING! ;)

Are you going to build up the motor, too? Certus arm, Magnum 66 magnets... etc?

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#18 TSR

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Posted 17 June 2008 - 04:34 PM

The pans are backwards on the bottom pic..

It's that pointy look, you know... :laugh2:

#19 dc-65x

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Posted 17 June 2008 - 05:31 PM

You didn't think I was going to put it together stock, did you? ;) :laugh2:

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#20 TSR

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Posted 17 June 2008 - 05:33 PM

You need a Shinoda body for that... :)

#21 okibono

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Posted 17 June 2008 - 07:24 PM

LOL, what kind of tumbler made it that look that good???
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#22 Prof. Fate

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Posted 18 June 2008 - 01:22 PM

Hi,

P... I noticed. It seems that we have been talking to each other about these frames for a long time. I merely observed that you mentioned the tube, but not the rest. The rails are, I think, very important.

A lot of this discussion involves venue! In the day Group 12 was supposed to be super limited. And no track I was doing 12s on would have allowed re-hinging, as an example. or the tube. They DID allow a wire crosspiece and the other bits. I suspect becasue they weren't visible from casual observation.

Now, for me, the cars are restored to the rules I was allowed to run them under. I have no idea what any current retro program would allow. That drop arm hinge was so loosy-goosey that no one objected to a bit of solder, but rehinging that or the pans would have risked the wrath of the tech inspector.

A local friend who owned a track here in Utah (Wayne Motley, "The Slot Spot") used these cars about '70 in a lot of other local track programs with some effect. But the mods he made usually made him run in "open".

Fate
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#23 dc-65x

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Posted 19 June 2008 - 08:11 PM

Is this a test?

The pans are backwards on the bottom pic... :laugh2:

 
Photobucket is finally working for me again so I accept Jairus' test. I reassembled the chassis without looking at any pictures:

DynamicGP12010.jpg
 

LOL, what kind of tumbler made it that look that good???

 
Here is the link to my tumbling post for you :

Tumbling
 

Now, for me, the cars are restored to the rules I was allowed to run them under.


Interesting point, Rocky. I'm going to look through the NCC rules. If I can't find an answer I may brace with piano wire without the axle tubes. I want to be period "korrect." smile.gif


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#24 Jairus

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Posted 19 June 2008 - 08:53 PM

:laugh2: :laugh2: :laugh2:

You so funny... I kill you last! :D

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#25 Régis4446

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Posted 25 April 2015 - 07:53 AM

Hello Rick

Is what you have pictures of this finished frame, I have the same to clean.


Régis Baron

#26 dc-65x

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Posted 25 April 2015 - 10:13 AM

Hi Régis,

 

I've been selling off some of my projects on eBay. The "group racing" production cars like this Dynamic was among them.

 

You should be able to make a great car by following the magazine article above.

 

Rick


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#27 Jairus

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Posted 25 April 2015 - 10:16 AM

Sad to hear this, Rick. :shok:


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#28 dc-65x

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Posted 25 April 2015 - 10:19 AM

No worries, Jairus, I've still got enough projects to keep me busy! I'm just concentrating mostly on scratchbuilding and less on the kit stuff.


Rick Thigpen
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#29 Jairus

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Posted 25 April 2015 - 10:31 AM

I do both. Built two Dynamic kits lately, use Dynamic parts to build a scratchbuilt Maserati 250f for Chris Clark.

 

And am now building a totally scratchbuilt chassis for Max today. He calls it "Nightwing".

But I still have one of those Dynamic Gp 12 RTRs that I am hoping to get to eventually.


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Check out some of the cool stuff on my Fotki!


#30 Régis4446

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Posted 26 April 2015 - 02:41 AM

Hello friends and thank you for the quick répnse.

Like Rick, I like to build, but it is for a vintage racing project.

But first I have to finish my other scratch
Régis Baron

#31 Lone Wolf

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Posted 26 April 2015 - 08:13 AM

Too many Dynamic projects you say? Nonsense  :)

 

These are the neat 1/32 versions. They are on a back burner as I wait for bodies.  The only bodies I ever found for these are done by Victor at Truescale. He has the original Dynamic Ferrari 612 mold I believe. Mr. Sampson is kind enough to be asking him to pull some more for me. 

 

DSC06331.JPG


  • endbelldrive, miko and SlotStox#53 like this

Joe Lupo


#32 SlotStox#53

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Posted 26 April 2015 - 08:31 AM

Very nice collection of Dynamic projects Joe! Never seen the 1/32 ones before .





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