The rear suspension of our cars have a split shock/spring setup (called divorced, I believe). If I were to replace that setup with coil-overs in the rear, would that add
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11-25-2019, 04:35 PM | #1 (permalink) |
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Coil-overs and mechanical stress?
The rear suspension of our cars have a split shock/spring setup (called divorced, I believe). If I were to replace that setup with coil-overs in the rear, would that add a lot of stress to where the shock is bolted in? (Since the stock springs are removed, it seems like there would be more stress on the shock / shock mounting area because we are moving the spring to the shock via a coil-over setup.)
Hope you guys understand what I mean. It seems like switching from a 'divorced' setup to a coilover setup would put all of the suspension forces into the single shock area, instead of distributed between two different areas like the divorced setup. I haven't heard of people having issues with this, I just want to know for sure before punching a hole in my frame.
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11-25-2019, 04:45 PM | #2 (permalink) |
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i think there is a company that makes reinforcements for the towers.
I've never heard of anyone running into an issue with the "True rear" coilover style Some manufacturers offer oem style as well. |
11-25-2019, 05:23 PM | #3 (permalink) |
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My guess is, most people don't put enough miles on their Z / sell it before they notice an impact on the metal.
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11-25-2019, 06:12 PM | #5 (permalink) |
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Plenty of guys on the track run true type coils. You'll be fine.
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11-25-2019, 06:15 PM | #6 (permalink) |
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Agreed
I think the THEORY is correct that there is more stress at the mounting spots but in practice basically no one is going to feel it. Maybe at racecar levels, but those folks will have the means to reinforce the area Note that the bigger issue os the geometry change that affects SPRING RATe and its effects T |
11-25-2019, 09:55 PM | #7 (permalink) | |
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11-26-2019, 05:09 PM | #9 (permalink) |
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Read this thread for spring rate discussion when going to true type vs divorced type
Aero and Suspension Tuning With True Type Coilovers
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11-27-2019, 04:33 AM | #10 (permalink) |
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And I thought the curbs in my local track are hard on car
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11-30-2019, 06:26 PM | #11 (permalink) |
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So I went oem style as this was part of my concern as well and also the coil overs I went with don’t have a true type option so that made that easy. That said one thing MCA pointing out when I was considering going that route is that the cars bottom out bumper are on the shocks in oem setup so when the car bottoms out (which is more frequent with oem softer suspension) all the vehicle weight is sent to the strut towers which is a lot more force then hitting regular bumps at speed. So this does make sense to me especially if the z uses longer mcu bump stops on the shock in oem form as many manufacturers do which makes the bumper act as part of the suspension by adding progression and not just a limiter (I forget if they did or didn’t when I removed stock suspension). For me I only change ride height when going to a track day and in those situations I’m already swapping brake pads so I’m kind of in for a project anyway so the added time of being oem type isn’t too big a deal but I am kind of jealous of the ease of adjustment on true type. I do wish there was more clear answer on if you should preload the oem type or not, some manufacturers say to preload the springs and others say not to. In oem suspension the springs are not preloaded but then the shock have more stroke to play with too.
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11-30-2019, 07:11 PM | #12 (permalink) | |
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I think mine maybe the only non-caged Z34 that has strengthened rear shock towers after the "true-type" conversion. Others that have strengthened the rear shock towers are all byproduct of roll cages. But like others have said, we have not heard of any shock tower failures, in the Z34 circle nor the heavier G37 coupe and sedan side of things.
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11-30-2019, 07:31 PM | #13 (permalink) | |
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11-30-2019, 11:23 PM | #14 (permalink) | |
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12-02-2019, 12:06 PM | #15 (permalink) | |
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