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Old 08-06-2009, 08:20 AM   #16
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Err, has any of this answered your question Ricky?
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Old 08-07-2009, 04:07 PM   #17
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While we're here, anyone know aht HPI pinks are really?

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Old 10-21-2009, 07:43 PM   #18
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While we're here, anyone know aht HPI pinks are really?

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18.0 lbs......
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Old 10-21-2009, 08:08 PM   #19
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18.0 lbs......
Actually HPI Pink measures at 16.79 despite whatever it says on the label!
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Old 10-21-2009, 08:12 PM   #20
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Is there not a "proven" chart showing the pound ratings for all of the black xray springs?
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Old 10-21-2009, 08:12 PM   #21
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Actually HPI Pink measures at 16.79 despite whatever it says on the label!
how did you figure ?
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Old 10-21-2009, 08:58 PM   #22
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Does the HPI HB springs fit on the Xray shocks?
Have anyone try? Do they work ok?
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Old 10-21-2009, 10:26 PM   #23
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how did you figure ?
.
Attached Thumbnails
Xray springs what does the 2.4/2.6 equal in pound/wt?-hpi-pink.jpg  
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Old 10-22-2009, 06:58 AM   #24
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Made this up a while back, not perfect but closer than the manufactures!;

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Old 10-22-2009, 07:12 AM   #25
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Quote:
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HPI gold and silver are indeed linear (see pics). An averaged measured value of 17.49 and 16.21 lb/in respectively. A little bit off from published values of 19.04 and 16.91 lb/in. See the Tryhard website for other measured springs.
Sorry to contradict BUT...

Your graphs both show that at the very beginning the rate deviates from your calculated curve.

This is where the different makes and springs designs have their differences.

You CANNOT ignore the first 5-6mm of the curve because that's where the springs are most of the time when the car's on the track.
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Old 10-22-2009, 08:42 AM   #26
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(.05" = 1.27mm)
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Old 10-22-2009, 10:33 AM   #27
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Sorry to contradict BUT...

Your graphs both show that at the very beginning the rate deviates from your calculated curve.

This is where the different makes and springs designs have their differences.

You CANNOT ignore the first 5-6mm of the curve because that's where the springs are most of the time when the car's on the track.
The test equipment has perfectly flat upper and lower platens that compress the spring. However, when you place the spring on the lower platen, the top of the spring is never 100% flat and parallel relative to the bottom. The curve at the beginning is just the spring settling into the fixture.

If you look at the HPI gold chart - this "nonlinear" region is about 0.01" or about 0.25mm. If you do a best fit to a perfect linear line - the R squared value is 0.9999. That spring is 99.99% linear.
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Old 10-22-2009, 04:23 PM   #28
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when i measured the black xray springs they were linear, to convert from Xray "C" which is N/mm to lb/in you multiply by 5.71.

http://forum.teamxray.com/viewtopic.php?t=9144
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Old 10-27-2009, 11:01 AM   #29
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when i measured the black xray springs they were linear, to convert from Xray "C" which is N/mm to lb/in you multiply by 5.71.

http://forum.teamxray.com/viewtopic.php?t=9144
i finally measured a set as well. pretty solid:

SPRING - RATE - DELTA (L/R)

XR - 2.2 - 12.4 - 0.06
XR - 2.4 - 14.1 - 0.02
XR - 2.6 - 15.1 - 0.10
XR - 2.8 - 16.3 - 0.12
XR - 3.0 - 17.5 - 0.27
XR - 3.2 - 18.4 - 0.18
XR - 3.4 - 20.0 - 0.01
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Old 12-27-2009, 05:56 PM   #30
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Hate to open up this can of worms again, but does anyone know the actual rate of the Tamiya coloured springs, by that I mean measured, not what it say's on the packet

Particularly interested in Tamiya White, Yellow and Blue (as these are the springs I see used a lot.

Thanks
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