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Tamiya F104 Pro!

Old 07-26-2011, 12:51 PM
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crazy question but...

has anyone noticed that the rear pod doesn't rotate left-to-right evenly? I was playing with mine last nite and noticed it rotated more to the passenger side (if it was a 2 seater), then to the drivers side...I looked at the rear diffuser and saw that some of the webbing was thicker on the drivers side of the piece then the diff side..

am i looking too much into this? or is this something people have modified to get even left-to-right rotation?
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Old 07-26-2011, 12:53 PM
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Originally Posted by monkeyracing.cz View Post
F1 - WET RACE - final movie ...

http://www.youtube.com/watch?v=hGdUO2V10L8

(Watch in HD)

and "Behind the scenes" ...

http://www.youtube.com/watch?v=gi7KE6zT-2I
Brilliant work!
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Old 07-26-2011, 01:47 PM
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Originally Posted by k_bojar View Post
crazy question but...

has anyone noticed that the rear pod doesn't rotate left-to-right evenly? I was playing with mine last nite and noticed it rotated more to the passenger side (if it was a 2 seater), then to the drivers side...I looked at the rear diffuser and saw that some of the webbing was thicker on the drivers side of the piece then the diff side..

am i looking too much into this? or is this something people have modified to get even left-to-right rotation?
Is this with the body on or off?
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Old 07-26-2011, 01:50 PM
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Originally Posted by MikeR View Post
Is this with the body on or off?
the body is off, shock is off, no wires on the motor and no wheels on the rear end...just twisting it by hand and noticed it stopped sooner on the one side...I guess I should have added i have the heavy pivot plate on the car

it may be nothing, but i figured i'd ask in case anyone else noticed this
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Old 07-26-2011, 02:18 PM
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k_bojar, I notice it too...the plastic bottom motor plate does have a rib that comes into contact with the rear chassis bulkhead when twisted to extreme angles. I thought about taking a dremel and trimming the plastic so that it flexes evenly both directions but wondered if we'll ever get that much deflection under normal circumstances. Honestly if your car gets that far out of shape, you're either doing some serious curb climbing, crashing, or offroading
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Old 07-26-2011, 02:21 PM
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Originally Posted by rtypec View Post
k_bojar, I notice it too...the plastic bottom motor plate does have a rib that comes into contact with the rear chassis bulkhead when twisted to extreme angles. I thought about taking a dremel and trimming the plastic so that it flexes evenly both directions but wondered if we'll ever get that much deflection under normal circumstances. Honestly if your car gets that far out of shape, you're either doing some serious curb climbing, crashing, or offroading
well i've been know for doing a little of all that and a lot of time within the same lap or corner

like i said, i was playing with it, and i'm sure it'll never get that much rotation under normal circumstances - but i figured i'd ask to see if anyone else noticed it or did anything to correct it

if you say it's fine, that's good enough for me I know you know your stuff
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Old 07-26-2011, 03:15 PM
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So... I have a low pro servo sitting around and want to try running it so the servo saver is positioned in a way so its easy to remove the massive bump steer the stock geometry gives. Has anyone noticed any weird things this does? Its a huge steering geometry change, and im wondering if I would be wasting my time with it :P. Thanks!!!
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Old 07-26-2011, 03:37 PM
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Originally Posted by Korey Harbke View Post
So... I have a low pro servo sitting around and want to try running it so the servo saver is positioned in a way so its easy to remove the massive bump steer the stock geometry gives. Has anyone noticed any weird things this does? Its a huge steering geometry change, and im wondering if I would be wasting my time with it :P. Thanks!!!
Bump steer is gone using this method Alloy servo saver and 6mm in spacers with Exotek servo mounts and low profile outter balls. Trim under the upper arms to keep from hitting the arm.

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Old 07-26-2011, 03:38 PM
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Originally Posted by Korey Harbke View Post
So... I have a low pro servo sitting around and want to try running it so the servo saver is positioned in a way so its easy to remove the massive bump steer the stock geometry gives. Has anyone noticed any weird things this does? Its a huge steering geometry change, and im wondering if I would be wasting my time with it :P. Thanks!!!


Add 2mm spacers under the ball studs...
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Old 07-26-2011, 04:21 PM
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Originally Posted by MikeR View Post
Bump steer is gone using this method Alloy servo saver and 6mm in spacers with Exotek servo mounts and low profile outter balls. Trim under the upper arms to keep from hitting the arm.

That's the picture I was looking for! Thanks Mike!

-Korey
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Old 07-26-2011, 05:06 PM
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Mike!!! Dude that is 1x10^6% pure win! Also you've got the fastest color. That looks to be good for at least half a second per lap
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Old 07-26-2011, 07:09 PM
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Default F104 X1 Build - Step 18

Step 18 calls for assembly and attachment of the front uprights.

Parts for step 18


Please note the following:
  • The kit provides all three different springs. Nice!
  • I replaced the plastic spacers with aluminum spacers. Precision!
  • I used black springs with Tamiya soft damper grease to provide some form of damping

Too help keep everything in place, use blue loctite on the 2mm nuts and 3mm grub screws


Before I tighten the grub screw completely, I pinch the steering upright up against the upper arm. I'm not certain if doing this affects anything, but it can't hurt.

Step 18 completed
Attached Thumbnails Tamiya F104 Pro!-18_parts.jpg   Tamiya F104 Pro!-18_loctite.jpg   Tamiya F104 Pro!-18_complete.jpg  
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Old 07-26-2011, 07:24 PM
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Default F104 X1 Build - Steps 19-22

These steps involve the assembly of shock and roll damper. Not much more can be said about the TRF damper that hasn't already been said before. It's simply the best out there.

Parts for steps 19-22


Note the following:
  • I added a 0.1mm spacer between the bottom c-clip and shock piston. This reduces any slop that the piston may have.
  • The instructions call for Tamiya ball diff lube for the roll damper. Since this is the first X1 I've built, I will go with that. After putting the roll damper on the car, it does feel a little light but very smooth and may just work for the Tamiya track.
  • I was pleasantly suprised when I opened the parts bag to found out that the kit comes with 3 springs for the rear shock. The red spring feels almost like the old gold miata spring and that's what I used.
  • Assembly of the TRF damper is pretty much a no-brainer. While putting the shock together, I used a drop of shock oil on the orings, rod guides, and shock shaft,

0.1mm spacer on top of the shock shaft's c-clip


Steps 19-21 completed


Dampers attached, step 22 completed


From another angle


Once everything was together, the damper feel seems to be very promising. It's got that floppy loose feel, but is smooth at the same time.
Attached Thumbnails Tamiya F104 Pro!-19-22_parts.jpg   Tamiya F104 Pro!-19_spacer.jpg   Tamiya F104 Pro!-21_complete.jpg   Tamiya F104 Pro!-22_complete1.jpg   Tamiya F104 Pro!-22_complete2.jpg  

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Old 07-26-2011, 07:34 PM
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Default F104 X1 Build - Chassis Completed

That pretty much covers the assembly of the chassis. With the exception of a few minor pieces, the car is very close to being finished.





Things to do before the car is ready to run include initial setup, setting steering toe angles, adjust steering end points on the radio, glue tires, mount body, break in of the diff, etc...If you want, I'll post more information about that when I finish prepping the car for it's maiden run.

I hope this build has been informative and I thank you for taking the time to view it. If you have any questions or comments, please let me know.
Attached Thumbnails Tamiya F104 Pro!-22_complete3.jpg   Tamiya F104 Pro!-22_complete4.jpg  
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Old 07-26-2011, 07:40 PM
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To me it looks like all you need to convert is the top plate, the new damper and counterweight. Lets hope those things are worth it.


Now for my own blabering. I posted earlier some pics of my moded front wing. I could deffinetly tell a difference but it got me thinking, is there enough to see a difference in airflow. So I oiled the front wing to get collection of dust on lower pressure areas.



Hard to tell in pics but you can see where it is sucking dirt off the street and sticking it on the part where the airflow detaches as it gets too steep. Another thing i noticed was my suspension was covered in oil and dirt in areas much higher than the front wings


Conclusion, it works better than i expected.
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