 914 Suspension motion ratios, Comparing notes |
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| groot |
 Nov 27 2004, 09:53 AM
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Dis member  Group: Members Posts: 897 Joined: 17-December 03 From: Michigan Member No.: 1,444  |
I measured my front and rear motion ratios yesterday and wanted to compare notes with any that have done the same.
For the rear suspension I took ~20 data points and did a best fit analysis to come up with 1.00 to 1.00 damper travel to wheel travel with strong statistical correlation. My front geometry is a bit different than a standard 914, so the motion ratio should be different, too. I measure ~10 points and found 0.83 damper travel to wheel travel, again with strong statistical correlation. I'm about to order my rear shocks and this is one of the bits of data they need to build the shocks. |
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| groot |
Nov 29 2004, 09:40 AM
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Dis member Group: Members Posts: 897 Joined: 17-December 03 From: Michigan Member No.: 1,444 |
Angled down towards the wheel (better than parallel) to the ground is a decent rule of thumb, but .... see my signature.....
You can always just drive it and have fun (IMG:style_emoticons/default/wink.gif) and not stress about it. If the roll center is too low, you just need more roll stiffness to counter it. I think that's why there are so many big ARBs for the 914. Since I know I'm not Montoya I need to build a car that is easier to drive and I like the engineering exercise behind it all. |
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Posts in this topic
groot 914 Suspension motion ratios Nov 27 2004, 09:53 AM
groot And....
If anyone had determined the height of th... Nov 27 2004, 12:10 PM Brad Roberts Your making me think.. :D
I have all of this inf... Nov 27 2004, 02:33 PM slivel Kevin,
I realize that I sent the wrong numbers to ... Nov 27 2004, 02:51 PM Brett W Kevin
Who are you having do your shocks?
Steve
W... Nov 28 2004, 10:53 AM slivel Kevin, Brett,
I would love to compare notes with ... Nov 28 2004, 11:21 AM Eric_Shea Nice to have a Brother in the shock business... :... Nov 28 2004, 11:27 AM Thorshammer Kevin,
What do you plan on using for shocks????
... Nov 28 2004, 01:08 PM Jeroen I just uploaded Steve's excell sheets.
You can... Nov 28 2004, 06:11 PM Brett W I too spent hours measuring the points for all the... Nov 28 2004, 08:19 PM groot I'm going with Koni 30s in the rear. They have... Nov 29 2004, 07:49 AM ottox914 So how low is TOO low on the front of a stock 914?... Nov 29 2004, 08:48 AM Bigbohr groot That's how I see it.
I didn't increase th... Nov 29 2004, 03:34 PM groot Well, I re-measured and still get 1:1 on the rear,... Nov 30 2004, 09:51 AM Brett W I was told by someone I trust to figure about 16 i... Nov 30 2004, 10:36 AM groot That sounds like it's in the ballpark.
For re... Nov 30 2004, 02:38 PM Brett W I guess the DOHC V8 moves some of the weigh a litt... Nov 30 2004, 05:32 PM TimT I like this thread Nov 30 2004, 05:36 PM redshift First off, all you guys have lost your lids.. :lol... Nov 30 2004, 05:42 PM Bigbohr If somebody wants some info on front Mac suspensio... Nov 30 2004, 11:24 PM Brett W The factory front suspension geometry moves all ov... Nov 30 2004, 11:56 PM groot Here's a simple front roll center calculation ... Dec 1 2004, 07:26 AM smdubovsky Interesting thread.
Kevin, When I d/l your spread... Dec 1 2004, 07:43 AM groot Excel for XP.... don't know why it does that.
... Dec 1 2004, 08:00 AM groot And now with a simulated lowered 914.... Dec 1 2004, 08:01 AM Jeroen Kevin's excell sheet can be downloaded here:
... Dec 1 2004, 08:31 AM groot Maybe some more explanation would help...
The cha... Dec 1 2004, 08:38 AM Nick I'm reading this thread and wondering if anyon... Dec 1 2004, 09:24 AM groot The Carrol Smith books are a great start.
From th... Dec 1 2004, 09:38 AM jwalters :trophy: You know what somebody needs to do--is de... Dec 1 2004, 09:43 AM TimT FWIW i just read in Paul Freres book "Porsche race... Dec 1 2004, 09:49 AM Brett W Those books that Kevin listed are considered by mo... Dec 1 2004, 10:50 AM groot The moveable suspension pickup points is in theory... Dec 1 2004, 02:57 PM smrz914 For those of us that like engineering, cars, but a... Dec 1 2004, 11:37 PM jwalters groot Oh, I know what you're talking about now. Thos... Dec 2 2004, 08:23 AM slivel groot Steve,
I made some minor modifications......
Lin... Dec 2 2004, 10:00 AM groot slivel ottox914 I've been using MR SEARCH to try to find out w... Dec 1 2005, 06:42 PM groot Typically a strut front suspension has a motion ra... Dec 4 2005, 09:00 AM ottox914 Great, exactally what we were looking for. thank... Dec 5 2005, 07:53 PM maf914 Dec 6 2005, 10:28 AM groot Longer arms reduce the camber, toe and roll center... Dec 6 2005, 11:09 AM
Brett W Kevin's right packaging is a big problem with ... Dec 6 2005, 01:48 PM |
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