02-01-2022, 08:56 AM | #1 |
Drives: 2018 Camaro ZL1 Join Date: Dec 2021
Location: MI
Posts: 20
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ZL1 1LE Spring Rate, Motion Ratio, and Ride Frequency Info
Greetings. I've been searching for a more street-friendly set of coilovers for my ZL1 1LE. Save the roast fest for later. Michigan roads are brutal! And they're no longer covered under warranty so I would rather save them for the track considering I haven't found a supplier willing to rebuild the Multimatic DSSVs in the case they blow out. I've ran across aftermarket suppliers offering downright silly spring rates across the board, so I decided to do my own research and determine the best spring rate to request for my desired goal.
I will keep everyone in touch this spring/summer with the results in terms of ride frequency & comfort. Comfort may not be your goal, but it will prove that I've got the right calcs/ratios for Frt/Rr spring rates & ride frequency. |
02-01-2022, 09:09 AM | #2 |
Drives: 2018 Camaro ZL1 Join Date: Dec 2021
Location: MI
Posts: 20
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I threw the RS in there since it was my previous vehicle. As you can see, the 1LE has absolutely ridiculous spring rates / ride frequencies. Definitely a track car as advertised!
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02-01-2022, 10:18 AM | #3 |
Drives: 2023 Cadillac CT4 Join Date: Jan 2022
Location: New Hampshire
Posts: 48
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Interesting stuff. On my S197 Mustang GT I had some aftermarket springs on it with 225 lb/in front rates, and 200 lb/in rears. It was stiffer than I'd have preferred for the street but still a bit soft for the track. Normally the S197 guys like 550 lb/in or stiffer up front depending on aero setup for the track so the ZLE is definitely right up there.
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02-01-2022, 10:48 AM | #4 |
Drives: 2016 1ss camaro Join Date: Feb 2016
Location: 909
Posts: 9,817
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reach out to terry at vorshlag i got from my mcs setup from him he can help i did 700 f / 800 r on my car
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16 1SS NIGHTFALL GRAY METALLIC WITH NPP #BECAUSERACECAR #SAVETHEMANUALS
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02-01-2022, 01:12 PM | #5 |
Drives: 2018 Camaro ZL1 Join Date: Dec 2021
Location: MI
Posts: 20
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Definitely stiff! I'm trying to find some information on the spring rate of the Base (non-1LE) ZL1s. If you happen to know those numbers please let me know.
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02-01-2022, 01:19 PM | #6 |
Drives: 2018 Camaro ZL1 Join Date: Dec 2021
Location: MI
Posts: 20
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Fortune Auto recommended 6K (336ftlbs) FRT and 14K (784ftlbs) RR as their default street driving spring rate. I thought they were absolutely crazy. 4K and 10K IMO are plenty and will yield a conservative ride frequency.
I was debating swapping the springs out on the DSSV shocks but I don't believe there's a way to remove the upper cap. |
02-01-2022, 01:35 PM | #7 |
Drives: 2016 1ss camaro Join Date: Feb 2016
Location: 909
Posts: 9,817
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fortune auto bc megan racing godspeed silvers are all the same shit
if you are removing them to replace and have a better ride you want to at least look at mcs or jrz or jri they are all quality coilovers
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16 1SS NIGHTFALL GRAY METALLIC WITH NPP #BECAUSERACECAR #SAVETHEMANUALS
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02-01-2022, 02:22 PM | #8 |
Drives: Chevrolet SS 1LE Join Date: Oct 2019
Location: St. Charles, MO
Posts: 1,446
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Question: where do these factory rates come from? That is, what's the source?
A few thoughts: -Only the Camaro comparisons are completely valid, because we don't know the motion ratios of the other cars. Most likely the Mustang and Challenger are at least somewhat close, but I think the Focus probably has factory coilovers in back rather than inboard springs like the pony cars, so its motion ratio is probably pretty close to 1:1, like the fronts of all these cars. -Remember, you square the motion ratio and multiply it by the spring rate to get the true wheel rate. On a ZLE, then, the wheel rate is .56*.56*1100, for a wheel rate of 345lb/in, vs about 450 for the front wheel rate. -Are the rear springs on these aftermarket coilover kits also true coilovers? It looks like they are. Again, if so the rear motion ratio for them is significantly higher than stock, as the shock mounts outboard of the stock spring pocket (but not as far out as the knuckle).
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Matt Miller
2020 SS 1LE |
02-01-2022, 03:03 PM | #9 |
Drives: Garnet Red / ZL1 1LE Join Date: Apr 2016
Location: Bel Air, MD
Posts: 492
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Look into Tractive coilovers from DSC/TPC Racing. They are about $6,500 before Uncle Sam gets his piece.
The damping can also be adjusted electronically on the fly. Another bonus is all 4 sides can be corner balanced. Michigan roads are garbage compared to roads further south. The state can only do so much with the harsh winters which require constant salting. The roads around me are much smoother and less of an issue with the ZLE. It also helps I'm on Michelin PS4S tires.
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#SAVETHEMANUALS
Last edited by Checkmate1; 02-01-2022 at 05:25 PM. |
02-01-2022, 05:22 PM | #10 | |
Drives: 2017 SS 1LE, 2016 1SS (previous) Join Date: Apr 2016
Location: Metro-Detroit
Posts: 1,863
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Quote:
Something to keep in mind: The Camaro GT4.R has three spring packages homologated to it... Lite = 375/650 Medium = 550/650 Firm = 800/850 |
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02-01-2022, 06:40 PM | #11 | ||
Drives: Chevrolet SS 1LE Join Date: Oct 2019
Location: St. Charles, MO
Posts: 1,446
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Quote:
Quote:
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Matt Miller
2020 SS 1LE |
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02-02-2022, 07:48 AM | #12 | |
Drives: 2018 Camaro ZL1 Join Date: Dec 2021
Location: MI
Posts: 20
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Quote:
And good point on the aftermarket coilover comment though. I don't think they're true coilovers in the rear. Likely just the same as most low-end kits out there. Front coilover, rear shock with spring. I will have to confirm. |
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02-02-2022, 07:55 AM | #13 | |
Drives: 2018 Camaro ZL1 Join Date: Dec 2021
Location: MI
Posts: 20
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Quote:
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02-02-2022, 08:54 AM | #14 | |
Drives: Chevrolet SS 1LE Join Date: Oct 2019
Location: St. Charles, MO
Posts: 1,446
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Quote:
However, we also have a thread on the MCS kit that Vorshlag is selling, and it clearly shows that the rear is indeed a true coilover setup instead of an inboard spring. So the motion ratio and appropriate spring rates are going to be very different. Here's a video showing that the GT4.R options use true coilovers in the rear. So it's just really important to know which configuration one is talking about when comparing rear spring rates. On that note, anybody know the motion ratio for the rear shock in a Camaro6?
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Matt Miller
2020 SS 1LE |
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