Handling issues - need adjustment advice |
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Handling issues - need adjustment advice |
Brian Fuerbach |
Jan 20 2022, 02:57 PM
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#1
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Member Group: Members Posts: 119 Joined: 1-July 19 From: Orange, Ca Member No.: 23,266 Region Association: Southern California |
When driving large sweepers like freeway on ramps at high speed I experience what I can only describe as front end scrubbing. Not understeer, more like the front is just not planted and tracking. Things get better with a full tank of fuel. Is that just the nature of the 914, full tank factored into weight bias, or can the suspension be tuned to emulate the weight.
Here is what Im working with; -19mm adjustable sway-bar set about 1” back from full soft. -Koni yellow adjustable shocks -Stock front torsions -Rear springs are aftermarket (reddish orange color) but I do not know the poundage. Any input would be appreciated. |
slivel |
Jan 23 2022, 11:27 AM
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#2
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Old car....... older driver Group: Members Posts: 514 Joined: 10-July 04 From: San Diego Member No.: 2,332 Region Association: Southern California |
Suspension dynamics were interesting to me as a club racer who spent lots of time and money developing my car over 23 years. When you move away from the factory equipment, you must consider the entire system to achieve a correct and maximum performing result for your purposes. This includes things like springs, shocks, sway bars, corner weight, unsprung weight, wheels tires, alignment settings and probably a few more. I recommend a web search using the search term "suspension frequency". Things like wheel rate and motion ratio and the natural frequency of the suspension will be presented.
This is a cut and paste form a quick search: Common suspension frequencies: 1.0 Hz - passenger cars 1.25 to 1.75 Hz - sports cars 2.0 to 2.5 Hz - autocross and racecars with low downforce 2.5+ Hz - high downforce racecars 1.45 Hz - Subaru BRZ (front and rear) Higher frequency suspensions get jiggly and are obnoxious and street cars and they tend to bounce over rough surfaces. Race tracks that are rough require suspension tuning (lower frequency) to get max performance vice smooth tracks. Auto manufacturers have compromise settings that you can move away from in either direction depending on the result you are seeking - Cadillac ride or McLaren ride. The wisdom and experiences here on this forum can help get you where you want to be, but some research will also help a lot. It's a process. On my car with no wing and little downforce and racing on a wide variety of tracks/surfaces I used less than 2.0 Hz. |
Superhawk996 |
Jan 23 2022, 12:55 PM
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#3
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914 Guru Group: Members Posts: 6,469 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
When you move away from the factory equipment, you must consider the entire system to achieve a correct and maximum performing result for your purposes. (IMG:style_emoticons/default/agree.gif) Truth! |
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