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Old 10-21-2003, 06:53 PM   #3901
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Rick- I honestly don't know what they are "supposed" to be but I'll measure mine later tonight and let you know what mine are.
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Old 10-21-2003, 07:23 PM   #3902
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Quote:
Originally posted by Joel Lagace
But if some one is running foams you need to caclute proper roll out and the takes into consideration tire diameter. IF everyone is running rubber then this is fine since most are 62-63mm in diameter but what if your running 60mm foams and im running 54mm? How do we compare ratios then? We need rollout. Your calculation is a final ratio calculation.

You're exactly right. I guess just multiply the rollout number (example: 7.0) times the tire diameter (54mm) and get a final rollout. I'm also running foams, now at about 59mm or so. So for me the rollout is 7 x 59 (413 mm), and you it would be 7 x 54 (378mm). Yes, I know my tires are too big .
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Old 10-21-2003, 09:33 PM   #3903
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Old 10-22-2003, 12:19 AM   #3904
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Rick- all my rayspeed shocktowers measure 3mm in thickness, I guess you got one that's extra thick there

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Old 10-22-2003, 04:11 AM   #3905
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Guys If you are using foams this is the way to work out the rollout

Tyre diam x 3.1416 divided by spur x pinion divided by 2.35(internal ratio SD

ie: 62 x3.1416 divided by70 x 26 divided by 2.35 = 30.78 rollout
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Old 10-22-2003, 04:16 AM   #3906
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Also the ideal tyre size.....to get the car going the fastest with any given motor seems to be between 57/58ml. You might have to go bigger on carpet to get ride height.
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Old 10-22-2003, 04:50 AM   #3907
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i try to get max life from my tires. I start at 60-61mm and run down as low as 53mm.

The good thing about doing a proper roll out calculation is that u can quickly compare ratios to guys running other cars. Since internal ratios and tire diameters will be different.
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Old 10-22-2003, 06:31 AM   #3908
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Built my black SD as kit and shimmed up the diffs as stated in the instructions. I take it the gears will bed in as the transmission is very tight and notchy. Rick
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Old 10-22-2003, 08:54 AM   #3909
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Rick they might be just a tad notchy a first. Mine were pretty smooth from the start but they got better and better after each run til they are smooth. The only thing I did was spray out my bearings and re oiled with lighter oil like WD40. That freed the drivetrain up good amount and then I put some Paragon liquid graphite on my gears (it dries in like 30 seconds) and leaves a black thin coating of graphite on my gears. My car is very smooth and the Paragon stuff does not make a mess in the gear case. I check my gears every week or two to check the wear and after about 12 weeks of running 6 to 8 packs a weekend in stock they still look like new. Now my car also has the stock whitish looking gears but I think the new ones are black. I know all my new gears I bought for spares are black.

Run the car once or twice on the track and check it and I'm sure you trans will not have a notchy feeling.
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Old 10-22-2003, 10:17 AM   #3910
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Hi Rick,

The suggestion from the local Yokomo racers is that run the car with the shims suggest from the instruction, once the gears broken in, then start playing with the amount of shims. Some of the tech calls they get at Yokomo about gear problems usually involves a racer starting to shim the transmission before the gear even breaks in.

On my shaft drive cars, I use a Yokomo MMS and hook it up to a Mabuchi motor, let it run at about 2.5v for 9-12 hours. It makes a huge difference

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Old 10-22-2003, 11:28 AM   #3911
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Wow Steve, that sounds like a long time! Do you just run the car over night or actually watch it, wait to make sure you don't chip a gear? Is there too much wear on the bearings or gears after running the car so long?
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Old 10-22-2003, 12:48 PM   #3912
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any guys using Tobee screws for sd?
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Old 10-22-2003, 01:22 PM   #3913
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I wasn't aware that there were 2 types of SD's going around the time I picked up mine. Didn't have a good look at the box.

I picked up the "Black Special". I would have grabbed the SSG over the black if I was aware.

I've now learnt that the difference in the chassis is that the Black Special is more rigid compared to the SSG. (correct me if i'm wrong).

Would the black special be suited for tarmac tracks? or would the SSG be the better chassis?

The Rayspeed upgrade kit is Black so I guess the black is better? confusing!!

Just getting back into R/C's... still learning!

Here is a pic of my SD



Oh, i just got the tyre warmers. All the guys who race @ Yatabe seem to get their car sticking so much better around the course I finially knew why! tyre warmers!!! Going to run the car again this friday! can't wait to see the difference they make!

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Old 10-22-2003, 01:52 PM   #3914
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Quote:
Originally posted by lonestar1127
any guys using Tobee screws for sd?
I bought one set but the screws have a flat head (not hex), i would suggest you to buy the Ti Take Off set.
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Old 10-22-2003, 02:11 PM   #3915
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the tobee screws doen't come with screw for the shocks??
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