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Right on
14/10 is the standard spring rate for oem divorced type for my Aragostas The thread linked above will explain why the rear rate should be lower on the true type FA’s recommendation is likely based on the oem type setup |
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Here's what FA asked to determine the spring rate: Year/Make/Model Type of Driving (i.e. 90% track 10% daily) Track Surface - Smooth, Bumpy, Both Brand,Model,Width Tires Other Suspension Mods (sway bars, bushings, etc.) Motor Swap? If heavily modified, weight of vehicle? Aero Mods (front splitter, rear wing, rear diffuser, flat undertray) Roll Cage? Y/N If roll cage, welded or bolted? So, I answered all of those questions and they came back with 14k front, 10k rear. Now, I suppose I may need less in the rear, but changing springs can't be that expensive or that hard, no? As for trying all of this out, yes, my performance mechanic who will be performing the corner balance and alignment already warned me to take it very easy the first time out with true coilovers as the car will be completely different than the standard OEM setup. He already availed me of numerous stories of people who did not take his advice and ended up with very wrecked cars. I am lucky to have a very good track close by that offers "lapping days" where you get about 4.5 hours of track time and can go out and test various setups on the car. Definitely something I'll be doing before I even attempt to run this thing at any other tracks in my area. I get it. There is A LOT that goes into the suspension and aero setup of a car. You've got spring rates, swaybars, alignment (caster, camber and toe), shock compression (high and low speed), shock rebound (high and low speed), tire pressure and brake bias. All of these impact how the car handles. I don't profess to be anywhere close to an expert in all of this and also know (from experience) that even a small mistake in our "hobby" can have disasterous results. I'm sending a followup email to FA to see how they go about determining the spring rate and if indeed need something softer in the rear. However, given everything that goes into suspension and handling, I'm guessing that one could also compensate for a slightly firmer rear spring by adjusting other areas of the suspension? |
When i asked Fortune about rates they sent same questions and i answered 90%/10% pretty much same specs, sways, no roll cage, they told me 11/9. i went with 14/10 (i think) and that **** is stiff af. i will probably replace springs with 11/8.
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16nz34, it’s time to get under the car and see for yourself the change in spring location, then educate yourself on advertised spring rate versus “wheel rate” (like hp vs whp).
The rear rate you have is too stiff. It’s not a matter of opinion. It’s math and physics. You just don’t run the same spring rate when the spring is relocated from inboard to closer to the wheel/hub. Imagine using a lobster cracker....put a spring where you grip the handle vs putting there same spring closer to the joint/pivot. You don't have a "slightly firmer rear spring". Your rear springs are way too firm. |
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