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Old 07-23-2013, 09:23 AM   #991
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Gearing question. Medium size outdoor and indoor asphalt tracks. Will be running 10.5 mostly with the stock spur. What pinion range? I also may toss a 4.5 in it now and then just for kicks. What pinion range there also with the stock spur?

Thanks for any feedback. Soldering up the car today and didn't have time to read this whole thread.

Running reventon pro esc and sp motors.
4.5t motor you can start around 19/85. Monitor temperatures closely.

10.5 I don't know sorry.
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Old 07-23-2013, 09:44 AM   #992
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4.5t motor you can start around 19/85. Monitor temperatures closely.

10.5 I don't know sorry.
Ok thanks. I hate posting up gearing questions but was in a hurry. I will start there and temp. I noticed a set up that was a 5.5 89 / 21 so I was way off in my guessing for an 85.
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Old 07-23-2013, 11:04 AM   #993
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Cpt.America, check and see if it's your piston rubbing the sides of your shock body. Maybe the shock shaft is at a weird angle when it is being compressed making the piston scrape against the side of the shock body. The shock will need to be mounted on the car to check this. Look to see if when compressed the shock shaft shifts in the shock body. I've had this happen when my O-rings are shot or when I build the shocks wrong..
It follows the rear of the car, not the shock or the piston. If I swap shocks front to back, it still happens in the rear, and not the front. Off the car, the shocks feel flawless. ON the car, the fronts feel flawless, the rears go "tick tick tick tick" on their way up.

It's not the shock, or the springs. I've tried 3 different sets of springs (not to try and fix this, just in playing/tuning). The only thing I can think of is that either:

A) the control arm actually IS making contact with the bulkhead somewhere, and I didn't remove enough material... and having the shock mounted is what puts enough pressure on the system to make the contact (considering the arms feel perfect with no shock mounted)

or

B) With the shock mounted, there is some strange pressure happening on the pivot balls, making some sort of stiction.

I guess ill try putting a tiny drop of oil down into the pivot balls... then try removing more material from the inside of the control arms.
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Old 07-23-2013, 11:28 AM   #994
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A) the control arm actually IS making contact with the bulkhead somewhere, and I didn't remove enough material... and having the shock mounted is what puts enough pressure on the system to make the contact (considering the arms feel perfect with no shock mounted)
or
B) With the shock mounted, there is some strange pressure happening on the pivot balls, making some sort of stiction.

I guess ill try putting a tiny drop of oil down into the pivot balls... then try removing more material from the inside of the control arms.
A. put a piece of paper on bulk side of arm and move the arm up/down. if it marks then shave a bit more.
B. why not take the pivot ball out of the bushing..perhaps a drop of CA fell on one side, etc. clean off i(if Yes)...then try again.
C. Long shot but perhaps drop screw isn't set right in the bushings...not probable but worth checking.

too many variables...best to just take apart, it's prob something minor with an easy fix.
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Old 07-23-2013, 11:58 AM   #995
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Which position have you on the geardiff and spool for belt tension. Are you using the standard position (white dot) ?

I think the standard dot seems a little to tight for the front belt, ore am I wrong ?

Anyone knows and maybe can link to shims for adjusting the ball studs on the suspension links, and also shims for inside the shocks for removing play.
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Old 07-23-2013, 03:01 PM   #996
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How do you measure the downstop on the new Mi5. I am used to measure underneath the C-hub, but the new design of the plastic part of the wishbone, make it very difficult. I tried to take a Picture about what I mean, hope it make it more clearly. The arrow shows where the plastic part is in the way for the downstop measure Tool.
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Old 07-23-2013, 03:21 PM   #997
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How do you measure the downstop on the new Mi5. I am used to measure underneath the C-hub, but the new design of the plastic part of the wishbone, make it very difficult. I tried to take a Picture about what I mean, hope it make it more clearly. The arrow shows where the plastic part is in the way for the downstop measure Tool.



turn the gauge North-South and measure.. gauge currently is facing West -East.
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Old 07-23-2013, 03:24 PM   #998
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turn the gauge North-South and measure.. gauge currently is facing West -East.
What are you doing in this thread?! Git!

You have one car that you are currently doing well with!
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Old 07-23-2013, 03:26 PM   #999
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How do you measure the downstop on the new Mi5. I am used to measure underneath the C-hub, but the new design of the plastic part of the wishbone, make it very difficult. I tried to take a Picture about what I mean, hope it make it more clearly. The arrow shows where the plastic part is in the way for the downstop measure Tool.
I myself never measure downstops... Just ride height, and droop.
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Old 07-23-2013, 03:58 PM   #1000
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Originally Posted by Shock Tower View Post
Which position have you on the geardiff and spool for belt tension. Are you using the standard position (white dot) ?

I think the standard dot seems a little to tight for the front belt, ore am I wrong ?

Anyone knows and maybe can link to shims for adjusting the ball studs on the suspension links, and also shims for inside the shocks for removing play.
I had to set the belt tension a little looser than standard for first few runs in spec. Now running at the white dots in Mod TC. If it's too tight, loosen it a notch or two, just keep an ear out for it, check regularly and tighten if necessary. Usually first place you'll hear skipping is under brakes.

Martin Hofer's website has an excellent build article with tips about shimming, removing slop etc. Article is here: http://hofaaa.wordpress.com/2013/06/...ortance-of-5p/. Basically for shocks he says:
- superglue piston to shaft, or use 0.1mm shims
- 0.3mm shim between shock seal and spacer (4mm inside dia I think)
- also cuts 3mm off shock shaft to shorten overall length

It's a good build article and shows the little extras that can be done to make the tiny differences for a pro-level build.
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Old 07-23-2013, 05:02 PM   #1001
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I myself never measure downstops... Just ride height, and droop.
+1

If I had to measure down stop, I would measure from the center of the axles with digital calipers. For simplicity, I would measure from the top of the axle to the setup board and subtract half of the thickness of the axle + height of support blocks. I don't see a need for it, but if you choose, you can than compare this value against any touring car.
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Old 07-23-2013, 07:26 PM   #1002
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Hey guys on the pics from Martin hofers car what eccentrics is he running on his car?? Are they from a mi4?? They are the purple ones.
Link to that page with the pics.
http://ets.redrc.net/page/10/
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Old 07-23-2013, 08:13 PM   #1003
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What are you doing in this thread?! Git!

You have one car that you are currently doing well with!
darn....i thought no one ever look to see if I was here.

Going to drop a mod in and see if she "Go Fast"
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Old 07-23-2013, 09:02 PM   #1004
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Originally Posted by Potoczak View Post
Hey guys on the pics from Martin hofers car what eccentrics is he running on his car?? Are they from a mi4?? They are the purple ones.
Link to that page with the pics.
http://ets.redrc.net/page/10/
I dont know for sure, but two things:
- probably a pre-production car - production mi5 didn't arrive until after that date
- he has said he likes replacing black with purple where possible - so if mi4 eccentrics fit (which I haven't checked...but bulkhead spacing and bearing size are the same...so probably they do) he might be running them just for the colour

Edit: Mi4 eccentrics don't fit properly into the bulkhead (advise from Schumacher), Martins were modified to fit
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Old 07-23-2013, 09:36 PM   #1005
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Originally Posted by scott_g View Post
I dont know for sure, but two things:
- probably a pre-production car - production mi5 didn't arrive until after that date
- he has said he likes replacing black with purple where possible - so if mi4 eccentrics fit (which I haven't checked...but bulkhead spacing and bearing size are the same...so probably they do) he might be running them just for the colour
Correct Scotty G! They do fit...I contemplated it when kitting out my purple Mi5, but thought they would get too dirty, so kept that black.

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