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Old 04-01-2011, 02:35 PM   #1141
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Since I like to use the search function, I did find this regarding the Hara springs:

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Originally Posted by linger View Post
After sitting on my desk for a year - I finally got around to measuring the Hara Springs. I measured two springs and took an average.
I'm impressed - these spring actually measure very close to the rating on the package - that's rare in the RC world.
The graphs show that the springs are completely linear (with best fit R squared value between 0.9988 and 1.0000 for you technical types).
The measurement was done with a Chatillon 10 lb load cell and a test stand with accuracy within .001".


Hara Springs
66961 Yellow
published = 12.88, measured = 12.97
66962 Silver
published = 14.00, measured = 14.37
66963 Black
published = 15.12, measured = 15.44
66964 Purple
published = 16.24, measured = 16.41
66965 Pink
published = 17.36, measured = 17.57
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Old 04-01-2011, 07:50 PM   #1142
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Hi,

anybody know part number for HPI blue and silver spring?

Thank you
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Old 04-01-2011, 08:37 PM   #1143
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Originally Posted by cuboi View Post
Hi,

anybody know part number for HPI blue and silver spring?

Thank you

6542 and 6543. Good luck finding them though. They've been out of stock everywhere for like 2 months!

Last edited by ittjv; 04-01-2011 at 11:31 PM. Reason: Can't spell!!!
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Old 04-01-2011, 10:11 PM   #1144
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Originally Posted by ittjv View Post
6542 and 6543. Good luck finding them though. They've been out of stock everyone for like 2 months!
I'm running into that very problem
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Old 04-02-2011, 01:49 AM   #1145
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I just got some blues in australia where i live and couldnt find silvers but was able to pick up the full set of HPI so i have plenty now
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Old 04-02-2011, 02:23 AM   #1146
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Anyone know where I can find info on converting 64 pitch gearing to 48 pitch? Thanks in advance.
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Old 04-02-2011, 08:15 AM   #1147
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Quote:
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Anyone know where I can find info on converting 64 pitch gearing to 48 pitch? Thanks in advance.
lem isn't the spur gear is all need to change over?
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Old 04-02-2011, 08:38 AM   #1148
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lem isn't the spur gear is all need to change over?
The Spur and pinion. Trying to gear a car for 21.5 requires small spur and a really large pinion. I'm trying the 48 pitch to see if I can make it work with the gears I already have.
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Old 04-02-2011, 09:54 AM   #1149
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not sure quite how to read it, but i hope it's firstly obvious that to use 48dp spurs, you need to use 48dp pinions...

But as a quick reference, it's pretty easy to convert 64dp to 48dp.

(teeth of 48dp spur / 1.5)*2 = Teeth in 64dp

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Last edited by TryHard; 04-02-2011 at 06:08 PM. Reason: corrected formula!
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Old 04-02-2011, 10:34 AM   #1150
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Quote:
Originally Posted by TryHard View Post
not sure quite how to read it, but i hope it's firstly obvious that to use 48dp spurs, you need to use 48dp pinions...

But as a quick reference, it's pretty easy to convert 64dp to 48dp.

(teeth of 64dp spur / 1.5)*2 = Teeth in 48dp

HiH
Ed
Yes this would help. Just to clarify. Target FDR is 3.3. Gears req in 64p 100spur and 63pinion with a 2.13 I.R. So 100/63*2.13=3.38 in 64pitch So using the formula...I would need a 133spur and 84pinion in 48pitch....correct?
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Old 04-02-2011, 11:15 AM   #1151
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Quote:
Originally Posted by piper48 View Post
Yes this would help. Just to clarify. Target FDR is 3.3. Gears req in 64p 100spur and 63pinion with a 2.13 I.R. So 100/63*2.13=3.38 in 64pitch So using the formula...I would need a 133spur and 84pinion in 48pitch....correct?
The formula TryHard provided is the wrong way around. It is from 48p to 64p. So you will need to revert it.

(64p teeth / 2)*1.5

Or just:
(64p teeth / 64)*48
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Old 04-02-2011, 05:51 PM   #1152
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Quote:
Originally Posted by TryHard View Post
not sure quite how to read it, but i hope it's firstly obvious that to use 48dp spurs, you need to use 48dp pinions...

But as a quick reference, it's pretty easy to convert 64dp to 48dp.

(teeth of 64dp spur / 1.5)*2 = Teeth in 48dp

HiH
Ed
Quote:
Originally Posted by Nilks View Post
The formula TryHard provided is the wrong way around. It is from 48p to 64p. So you will need to revert it.

(64p teeth / 2)*1.5

Or just:
(64p teeth / 64)*48
Okay, Well.....guess I'll take both inputs and get a third opinion. Thank you both for your help.
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Old 04-02-2011, 06:09 PM   #1153
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Quote:
Originally Posted by piper48 View Post
Okay, Well.....guess I'll take both inputs and get a third opinion. Thank you both for your help.
yup, my bad, got the formula wrong way round there! Nilks is correct, and i corrected my post.

Ed
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Old 04-02-2011, 08:42 PM   #1154
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I am in the process of trying to decide which TRF car to purchase, a 416x or 417. I come to you with this question. Knowing what you know now, which car would you purchase, a slightly used TRF416x or a new TRF417? I have the opportunity to purchase a TRF416x with a bunch of spare parts for $140 less than a new TRF417 with a few spare parts. I have never raced on-road so I will have a learning curve with both cars. Would you go for the older car at a lesser price or a newer car with the newer technology?
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Old 04-03-2011, 01:43 AM   #1155
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Hello, just concerning setup between tracks, what are the main changes between going from carpet to asphalt ?
What should be the first thing changed or what does everyone tend to change?
I was looking at some setup sheets and I think that most people tend to run shocks more upright, thinner oil, higher roll centeron the inner pivot. And also the longer links .
Am I right ?
Thanks
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