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Mark Payne 12-27-2005 11:22 AM

Hi

Have just updated www.12thrc.com with photos and instructions on the prevention and repair of rear tyre chunking.

Hope you find this helpful

Regards

Mark

tomdav 12-27-2005 11:41 AM

1/12 tips
 
Thanks Mark. Outstanding work.

I have a question for you. When attaching the football(3.2R) I get a tweak. I followed the directions but would get a tweak everytime. My tweak as viewed from the rear looked like a smiley face. Both outside rear edges would raise up. I nailed it down to the football screws that were not perpendicular to the chassis. Do you use the stock hardware or have you had this problem before? Do you use tape to hold the batts in?

DavidAlford 12-27-2005 12:35 PM

Whats a good starting point for tires when club racing on carpet?

Greg45231 12-27-2005 12:35 PM

Tom,

The O ring used for the battery hold down on the CK will cause the chasis to curl up the way you describe. Never store the car with the O ring installed or it will warp the chasis.

I always ran my car using the O ring but I never went to Marks level of checking for tweek so I may introduce some if used.

Greg

tomdav 12-27-2005 01:01 PM

tires
 
How about 1.90 rear and 1.80 front. I usually go down to 1.85 rear and 1.75 front. Smaller to a point will be faster.

Mark Payne 12-27-2005 02:02 PM

Hi Tom

I am not sure what your tweak is. Does the centre pivot (the football) assembly drop onto the chassis bolts without interfearence? Why are the chassis bolts not perpendicular to the chassis?

In answer to the battery tape question ... in the "Total Tweak Guide" at www.12thrc.com, I explain that I do NOT use the CRC rubber O ring to hold the batteries in. I use battery tape.

So I kind of agree with Greg. I am suspect of the O ring. I have no direct proof but last year I had a lot of tweak problems which made me REALLY think about it. A lot of what you read on www.12thrc.com comes from my tweak paranoia. I now have NO tweak issues but I realise some may think I am a little "over the top". So be it.

Cheers

Mark


Originally Posted by tomdav
Thanks Mark. Outstanding work.

I have a question for you. When attaching the football(3.2R) I get a tweak. I followed the directions but would get a tweak everytime. My tweak as viewed from the rear looked like a smiley face. Both outside rear edges would raise up. I nailed it down to the football screws that were not perpendicular to the chassis. Do you use the stock hardware or have you had this problem before? Do you use tape to hold the batts in?


JayBee 12-27-2005 02:07 PM

Hey Mark-
Is the info presented for the 3.2R good for the T-Fource I'm building?

Mark Payne 12-27-2005 02:24 PM

Hi Jaybee

What I know, I know well. I think about stuff and come to conclusions. I change my mind when someone explains where I am wrong. But.....

I am in my 2nd year of 1/12th and I have only run the CK 3.2R. I have never run a T Bar car... so you see I have no insight.

But.. all the front end build info is the same. Some of the tweak principles can be applied.

Hope this helps

Mark


Originally Posted by JayBee
Hey Mark-
Is the info presented for the 3.2R good for the T-Fource I'm building?


rollover 12-27-2005 05:19 PM

Mark Payne, I take offense of your web site. If I make a sandwich every time I fix chunked tires.....I won't fit on the drivers stand! :lol: :ha: :lol:

Seriously your site is the best for explaining 1/12 scale set up and repair I have ever seen. Thanks for your effort.

Scottrik 12-27-2005 05:59 PM

LOL

The BEST instructions tell you to eat, etc, so Mark is right up there. The 1/32 scale racing kits MRRC did a few years ago (from Mark's neighbors on the Jersey Isles) told you to sit down with a large glass of milk and a plate full of cookies and RTFM. The idea was not to rush what shouldn't be rushed.

Scottrik

outlandr91 12-27-2005 06:22 PM

Thanks for the info! I have one question.When looking at the front of the car, the steering turnbuckles are level, I think they should be on a slight downward angle where they connect to the servo.I'm using a Hitec HS225MG servo and a small servo saver.I'm thinking of putting a small washer under the ballstud to raise the outside a bit.What do you think?




Originally Posted by Pro ten Holland
Welcome to the world of 1/12th scale racing!
The Trinity reflex car can suit all your needs. Take your time building it, and make really really sure the front end doesn't bind in any place. You'll need to ream out some parts for that. The upper and lower arm balls and the steering blocks need to be checked for binding. Find the sweet spot between play and binding. Double check that camber and caster setting are exactly the same left and right.
Another important note: make sure the rear pod and main chassis are at the same height when the car is ready to run (with electronics and batteries installed). i.e. make sure the rear pod doesn't "hang low" or is jacked up by the center shock.
Switch the tires left and right every other run.
Stiffen the front tires sidewalls with CA, otherwise your car will easily traction roll.
Just make sure you can get the most of this car before moving on to another. You'll probably find out that you don't even need another car to run at the front of the pack. The Reflex did win some major races when it was just released and Trinity was still suporting it at their best.


Greg45231 12-27-2005 06:45 PM

Jaybee,

I currently run a T-Fource using the side springs instead of the tweek screws on the Tbar. As long as you are setting it up this way the Tbar only acts as a method of attaching the rear pod to the chasis (generally speaking) and Mark's proceedure for tweeking should work just fine.

Greg

Kevin K 12-27-2005 07:45 PM


Originally Posted by outlandr91
Thanks for the info! I have one question.When looking at the front of the car, the steering turnbuckles are level, I think they should be on a slight downward angle where they connect to the servo.I'm using a Hitec HS225MG servo and a small servo saver.I'm thinking of putting a small washer under the ballstud to raise the outside a bit.What do you think?

Guy....The links should be level or just a little bit above level at the servo saver. You might want to think about getting another servo other then the HiTec....for some reason these dont center that well and or hold center....although it was a while ago when I used one. If yours is newer it might not be that bad but just keep that in mind. If you need any help with the front end of the car come see me as I had one of these for a while and I will show you some easy way to check things out.

JayBee 12-27-2005 10:29 PM


Originally Posted by Greg45231
Jaybee,

I currently run a T-Fource using the side springs instead of the tweek screws on the Tbar. As long as you are setting it up this way the Tbar only acts as a method of attaching the rear pod to the chasis (generally speaking) and Mark's proceedure for tweeking should work just fine.

Greg

Thank you, I'll try that but using Mark's method for checking/setting tweak- is it easier?

tomdav 12-27-2005 10:39 PM


Originally Posted by Mark Payne
Hi Tom

I am not sure what your tweak is. Does the centre pivot (the football) assembly drop onto the chassis bolts without interfearence? Why are the chassis bolts not perpendicular to the chassis?

In answer to the battery tape question ... in the "Total Tweak Guide" at www.12thrc.com, I explain that I do NOT use the CRC rubber O ring to hold the batteries in. I use battery tape.

So I kind of agree with Greg. I am suspect of the O ring. I have no direct proof but last year I had a lot of tweak problems which made me REALLY think about it. A lot of what you read on www.12thrc.com comes from my tweak paranoia. I now have NO tweak issues but I realise some may think I am a little "over the top". So be it.

Cheers

Mark

Thanks for the response. I nailed it down to the nuts under the football. for some reason they were not parrallel with the chassis. So no matter how hard you would hold the chassis down and tighten up the football after you let go it would be bowed. These cars look so simple when you start :sneaky:


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