Another rear suspension idea, raising the rear trailing points |
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Another rear suspension idea, raising the rear trailing points |
bam914 |
Mar 13 2010, 09:05 PM
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#1
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Member Group: Members Posts: 334 Joined: 23-November 03 From: Atlanta, Ga Member No.: 1,378 Region Association: None |
So there have been a few different ways people on here have raised their rear mounts. Here is my way. I will be able to adjust my roll center by shimming the pickup points on the mount. I will also be able to adjust camber separate of the roll center. I have a few more braces to make before it is all done.
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ME733 |
Mar 13 2010, 09:18 PM
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#2
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Senior Member Group: Members Posts: 842 Joined: 25-June 08 From: Atlanta Ga. Member No.: 9,209 Region Association: South East States |
.........well BAM, what ever happened to the exhaust system you were mocking up?...It looked simple-direct -and functional.(usually a good sign something will work good).....Curious?? .........Murray
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bam914 |
Mar 13 2010, 09:34 PM
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#3
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Member Group: Members Posts: 334 Joined: 23-November 03 From: Atlanta, Ga Member No.: 1,378 Region Association: None |
The exhaust worked great! It sold with the engine that was in my car. Nothing like getting 108whp and 125ft/lbs out of a "stock" FI 2.0L
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ME733 |
Mar 14 2010, 08:52 AM
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#4
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Senior Member Group: Members Posts: 842 Joined: 25-June 08 From: Atlanta Ga. Member No.: 9,209 Region Association: South East States |
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J P Stein |
Mar 14 2010, 08:59 AM
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#5
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
Just my non-engineer .02.
Were it me, I would put the hiem joint attach points in double shear using a C section and tie in the supports at the same level of the pivot point. Your present set up gives the applied forces a mechanical advantage over the structure intended to hold it. Overall, I like the concept but, as is, doubt it's integrity. |
bam914 |
Mar 14 2010, 09:16 AM
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#6
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Member Group: Members Posts: 334 Joined: 23-November 03 From: Atlanta, Ga Member No.: 1,378 Region Association: None |
Like I said I have not added the rest of the braces. I am putting the heims in double shear and adding a couple more braces. It should be fine. But I am no engineer, just a high school graduate.
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J P Stein |
Mar 14 2010, 10:48 AM
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#7
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
Like I said I have not added the rest of the braces. I am putting the heims in double shear and adding a couple more braces. It should be fine. But I am no engineer, just a high school graduate. The only thing that kept me from going to college was high school......so I went to the school of hard knocks for 40 odd years. (IMG:style_emoticons/default/biggrin.gif) After working in various types of construction (planes & boats & trains), like to think have a good eye for how good engineers do what they do. I know you're not done so I fingered I'd get my .02 in before hand...not being critical, tho my form of attempting to help can be seen as so. (IMG:style_emoticons/default/confused24.gif) |
bam914 |
Mar 14 2010, 11:42 AM
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#8
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Member Group: Members Posts: 334 Joined: 23-November 03 From: Atlanta, Ga Member No.: 1,378 Region Association: None |
I appreciate the $.02. I like getting other peoples ideas and concerns when building some of my stuff. I have thought hard about how best to brace the mount. When you see what I have planned it should not move. It already is pretty stiff just being tack welded together.
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Jeff Hail |
May 3 2010, 01:19 AM
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#9
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Senior Member Group: Members Posts: 1,141 Joined: 3-May 07 From: LA/ CA Member No.: 7,712 |
So there have been a few different ways people on here have raised their rear mounts. Here is my way. I will be able to adjust my roll center by shimming the pickup points on the mount. I will also be able to adjust camber separate of the roll center. I have a few more braces to make before it is all done. The rear suspension on the 914 has never been an issue. Go back and look at all the old IMSA racers. They left the rear pretty much alone with the exception of stiffiners. The key to roll center on the 914 is the front suspension. No different than 911's. 935 style aka ERP is the ticket. |
Brett W |
May 3 2010, 11:22 AM
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#10
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Advanced Member Group: Members Posts: 2,856 Joined: 17-September 03 From: huntsville, al Member No.: 1,169 Region Association: None |
The rear suspension on the 914 has never been an issue. Go back and look at all the old IMSA racers. They left the rear pretty much alone with the exception of stiffiners. The key to roll center on the 914 is the front suspension. No different than 911's. 935 style aka ERP is the ticket. That is not entirely accurate. The rear suspension has always been a problem. The front and rear suspensions roll in different directions, the toe curves are radically different thus contributing to weird handling in race trim. The rear suspension is weak and goes from bad to worse when you stick big race rubber on it. All of the top running IMSA cars move the rear suspension points up, the back markers left them alone. |
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