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Old 12-26-2003, 03:13 PM   #91
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I hope this info. helps in some way. I run a Yokomo GT4 and the springs can be used front or rear. The following is the spec. chart for them.
AFM

YOKOMO GT4 SUSPENSION SPRING DATA

COLOR WIRE OD COILS LGHT EXTDIA INTDIA LBS/IN
Brown 1.70 5.00 22.15 17.55 14.10 32.99
Grey 1.70 5.50 22.15 17.55 14.10 26.55
Silver 1.70 6.00 22.15 17.55 14.10 23.87
Green 1.60 5.00 22.15 17.55 14.10 23.54
Yellow 1.60 5.50 22.15 17.55 14.10 23.20
Red 1.60 6.00 22.15 17.55 14.10 18.93
Drk Green 1.50 6.00 22.15 17.55 14.10 16.83

All measurements in mm except pound rating.
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Old 12-26-2003, 05:45 PM   #92
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Quote:
Originally posted by sbmon
I only disagree with the point about the spring being designed to bottom out completely(i don't think that they would be designed to actually contact each other)
I will admit this is just what i think and not what i know to be fact and from the view of your posts you are much more knowledgeable about this than I

Very interesting topic
Your quite free to disagree.
Buy tell us why you disagree, remembering that merely "believing" is insufficient basis for a rational proposition - e.g. The Easter Bunny.

Last edited by Taylor-Racing; 12-26-2003 at 05:58 PM.
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Old 12-26-2003, 05:52 PM   #93
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Quote:
Originally posted by afm
I hope this info. helps in some way. I run a Yokomo GT4 and the springs can be used front or rear. The following is the spec. chart for them.
AFM
afm,
Which of these springs come with the YOKOMO GT4 kit?
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Old 12-26-2003, 06:11 PM   #94
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save your time for track side testing. theory is only theory and sometimes will not work in real life.
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Old 12-26-2003, 06:27 PM   #95
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Dunno why I'm persisting here, but I'm hoping these guys will test their beliefs against facts and be a little more knowledgable at the end of the day.
Otherwise, they'll be at the track, furiously working on the assumption that their rear springs are the same rate as the fronts.

However it's true that:
In theory, "practice" and "theory" are the same thing.
But in "practice", they aren't.
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Old 12-26-2003, 08:00 PM   #96
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Ok Taylor,
I'm starting to think that maybe, just maybe, I was wrong

Last night I realized something. The R40 comes with black springs (both front and rear). And just like the silver and gold springs I talked about earlier, the front black spring has a thicker wire but is shorter than the rear black spring and both have the same number of coils.

Building the R40 by the instructions, the only difference between the front shock and the rear shock is the springs. Same oil, same piston, everything is the same except for those freaking springs.

If what I said before were true (springs with the same color have the same rate), then the front and rear shocks of a stock R40 are exactly the same. Well,,,, I really don't think that is correct.

Soooo,,, I stand corrected

The rear spring is softer than the front.

I only wish HPI would include the spring rates along with the other specs they give us for their springs.
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Old 12-26-2003, 11:30 PM   #97
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. . . at last.
But don't feel bad about being wrong - this wasn't a contest.

It's quite common for rear springs to be longer than fronts. As was mentioned, the rear shocks are often mounted more upright and therefore are more direct acting and need more shock travel.
The fronts are often more laid down, and don't travel very much at all.
This is the reason Manticore said that progressive springs are of little use to us.

Just for a laugh, swap the front and rear springs on your R40 one day, and tell us what you find.
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Old 12-27-2003, 07:49 AM   #98
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How to set the ride height?! Is it by winding the colar of shock spring or by screw adjuster of up stop.

Same time ago i didn't adjust the shock colar but I adjust the droop screw to get the ride setting. Meaning - 0 droop. Not sure you all understand this.. But i need to get the correct conclusion here.
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Old 12-27-2003, 08:20 AM   #99
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esham,
The info you want is pretty much on the first page of this thread.
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Old 12-27-2003, 08:20 AM   #100
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Quote:
Originally posted by esham
How to set the ride height?! Is it by winding the colar of shock spring or by screw adjuster of up stop.

Same time ago i didn't adjust the shock colar but I adjust the droop screw to get the ride setting. Meaning - 0 droop. Not sure you all understand this.. But i need to get the correct conclusion here.
Ok, lets try this one more time.

With the tires you are going to race, this matters because of diameter.

Back off the droop screws.

Set ride height with the spring collars and tweak with either a balance beam or at least two scales.

Set droop by lifting the car one end at a time and adjusting the amount the suspension droops (notice the name) with the droop screws. Read one of the many posts as to how much. Basically you need more on bumping tracks then smooth, and the end with less droop with generally have less grip than the one with more...usually! Try about 1 to 2 mm front and a little more in the rear. This is sometimes called down travel, because the arms drop down. Some cars have up stops as well, you set the by pushing the car down and adjusting so that the car just misse the ground.

Ted (Bobby's Dad)
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Old 12-27-2003, 08:59 AM   #101
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Quote:
Originally posted by Taylor-Racing
esham,
The info you want is pretty much on the first page of this thread.
I did go review it afew times carefully ..line per line...before i raise the question. I didn't find any answer on it.. pity me...


Quote:
Originally posted by Bobby Flack
Set ride height with the spring collars and tweak with either a balance beam or at least two scales..
Thank god...Thanks Ted...
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Old 12-27-2003, 09:33 AM   #102
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esham,

you adjust the ride height by winding the collar on the shock spring. If you were to use the droop screw or up travel screw, then you will have taken out any kind of suspension travel. The A-arms cannot move if the screws won't allow it.

Try to image riding in your 1:1 car if the suspension could not move up and/or down. It would be a very bumpy ride wouldn't it? Well the same thing would apply to your RC car.
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Old 12-27-2003, 09:41 AM   #103
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Taylor- Racing

In my first GT4, early 2000, the car came with the SILVER spring up front and the DARK GREEN at the rear.
Now remember, the original GT4 was oriented towards rubber tires.
Then I got the GT4- PRO and it came with the GREY springs allround and the car was more advertised towards Foams.
AFM
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Old 12-27-2003, 05:58 PM   #104
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Thanks, afm.
I just wanted to demonstrate:

The GT4 came with different colour, different rate springs front/rear.
The GT4- PRO came with exactly the same springs front/rear.

Perfect.
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Old 12-27-2003, 06:01 PM   #105
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Quote:
Originally posted by Bobby Flack

Ted (Bobby's Dad)
Hi Ted,
Are you part of a Father/Son team as I am?
Just wondering.

Gavin (Sam's Dad)
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