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Old 07-29-2012, 06:44 PM   #3931
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Ed, is it the hpi silver spring that you are using in your setup? If not, do you know their spring rate?
Yup, HPI silvers (original silver coloured ones at that). I played around a lot last week with springs and roll bars, especially on the rear, and the silver silver combo, for me, gives the best feel. I origianlly settled on harder spring, softer roll bar, for better forward traction, but with the diff change I've been able to go up again on the roll bar.

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Old 07-31-2012, 12:49 PM   #3932
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Yup, HPI silvers (original silver coloured ones at that). I played around a lot last week with springs and roll bars, especially on the rear, and the silver silver combo, for me, gives the best feel. I origianlly settled on harder spring, softer roll bar, for better forward traction, but with the diff change I've been able to go up again on the roll bar.

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Ed
What's the spring rate of the HPI Silver? Cant find it ...

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Old 07-31-2012, 02:44 PM   #3933
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What's the spring rate of the HPI Silver? Cant find it ...

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16.90 lb/in
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Last edited by Johnny Wishbone; 07-31-2012 at 02:59 PM.
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Old 08-01-2012, 02:38 AM   #3934
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Got my Exotec chassis in the mail today, Thanks to R.A.B. Hobbies for their super prompt service. Will be installing tonight for this weekends club meet, I'll post some feed back when I've tried it out .
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Old 08-01-2012, 05:52 AM   #3935
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If I go from 2ff/1fr to 1,5ff/1,5fr to have the same ackerman I should take away the shims on the steering links? How much?

PS: where in the set up sheet is the ackerman setting listed?

Thanks
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Old 08-01-2012, 06:38 AM   #3936
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The Serpent Black springs are 16.5, I would like to see if someone has both ( I probabaly do, but have to find them). Which ones are actually stiffer, and which spring is more linear.

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16.90 lb/in
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Old 08-01-2012, 07:42 AM   #3937
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The Serpent Black springs are 16.5, I would like to see if someone has both ( I probabaly do, but have to find them). Which ones are actually stiffer, and which spring is more linear.
Hi Tim and others.

Because the Serpent and the HPI spring have nearly the same rate, you can't say, that they are equal. The Serpent springs are 23 mm high, the HPI 26 mm. The Ride springs are 25 mm and the Tamiya springs 27 mm.

Many racers uses the HPI or Ride outdoors and the Tamiya indoors. I like the Ride outdoors, as the spring rates are pretty close. You can fine tune your car. At the WC we used Ride red in the front and Ride blue in the rear - rated 16,9 and 16,1.

I have made a spring and gearing chart. You can find it in the Serpent forum - page 4 under S411.
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Old 08-01-2012, 08:01 AM   #3938
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Nice... did not even know there was forum over there.. The website is kind of clunky...
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Old 08-01-2012, 06:48 PM   #3940
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Quote:
Originally Posted by Geberit View Post
If I go from 2ff/1fr to 1,5ff/1,5fr to have the same ackerman I should take away the shims on the steering links? How much?

PS: where in the set up sheet is the ackerman setting listed?

Thanks
No, you should add shims, as taking away the sweep moves the front outer axles forward, relative to the steering.
The other option is to move the arms back in the car (more shims in front of the wishbone) to keep the wheelbase the same, and run the same ackerman.

2.0/1.0 gives 1deg of arm sweep, so going to 1.5/1.5, which is straight arms (0deg), means losing a degree of hinge pin angle. It's not exact, but I figure on 0.5mm per 0.5deg of angle removed... So going from 2.0/1.0 to 1.5/1.5 either add 1mm of shims to the steering Ackerman, or add 1mm in front of the arm and leave the Ackerman alone.

HiH
Ed
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Last edited by TryHard; 08-02-2012 at 03:24 AM. Reason: Sweep, not shims!!
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Old 08-01-2012, 08:31 PM   #3941
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i know this is a rookie question so please bear with me.i tried the longer shock spring thing and i was able to get ride height[barely], but now the springs are always bound up. i dont know but i dont think this is a good thing.what is the diff. between springs that are [for lack of a better term] always bound to those that are not
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Old 08-01-2012, 09:56 PM   #3942
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is there a U.S retailer for the ride springs?
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Old 08-01-2012, 10:04 PM   #3943
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Answered My own question http://www.tqrcracing.com
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Old 08-01-2012, 11:58 PM   #3944
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Quote:
Originally Posted by TryHard View Post
No, you should add shims, as taking away the shims moves the front outer axles forward, relative to the steering.
The other option is to move the arms back in the car (more shims in front of the wishbone to keep the wheelbase the same, and run the same ackerman.

2.0/1.0 gives 1deg of arm sweep, so going to 1.5/1.5, which is straight arms (0deg), means losing a degree of hinge pin angle. It's not exact, but I figure on 0.5mm per .5deg of angle removed... So going from 2.0/1.0 to 1.5/1.5 either add 1mm of shims to the steering Ackerman, or add 1mm in front of the arm and leave the Ackerman alone.

HiH
Ed
Great, thanks for the answer!
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Old 08-02-2012, 02:39 AM   #3945
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Hi.

Attached find my gearing and spring chart. For those, who can't find it on the Serpent forum.
Attached Files
File Type: pdf Serpent S411 Gearing Spring English.pdf (92.8 KB, 141 views)
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