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Old 05-17-2018, 12:10 PM   #29
mav1178
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Originally Posted by why? View Post
so you can run these with stock everything else? I'd be very interested, I seem to rub on absolutely everything, If the spring rate is oem or higher and the handling won't be destroyed anyways.
I finally got them tested at Eibach.

Chuhatsu lift springs:
Front: 129 lbs/in
Rear: 206 lbs/in

For comparison purposes:

Car: Front OE Spring Rate:
Subaru BRZ 27 N/mm (153 lbs/in)
Scion FR-S 23 N/mm (131 lbs/in)

Rear OE Spring Rate:
Subaru BRZ 34 N/mm (195 lbs/in)
Scion FR-S 37 N/mm (211 lbs/in)
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Old 05-17-2018, 12:25 PM   #30
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A bit of a hijack, but sort of related to Mav's post above: Are there different spring part numbers for our cars based on option packages/vehicle weight, or are all BRZ springs (non including special package models like PP, tS, etc) or FR-S springs the same rate? I've been wanting a set of BRZ front springs for my FR-S, but want to be sure my ride height is going to stay where it is right now. Since our cars have very few items that are optional, I assume they are all the same within a given model, but just want tbe sure.
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Last edited by venturaII; 05-17-2018 at 12:39 PM.
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Old 05-17-2018, 01:42 PM   #31
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Hmm, it looks, like fronts may become a bit overdamped then? As side gain, maybe car will be less understeery then stock even without camber changes.
P.S.
Maybe worth adding those rates to OP.
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Old 05-17-2018, 01:46 PM   #32
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Thank you so much for posting the spring rate information.

Near OEM spring rate and an extra 15mm of wheel travel, I am ready to get a set.

How do I order a set for AT for delivery in the US?
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Old 05-17-2018, 01:49 PM   #33
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Quote:
Originally Posted by mav1178 View Post
I finally got them tested at Eibach.

Chuhatsu lift springs:
Front: 129 lbs/in
Rear: 206 lbs/in

For comparison purposes:

Car: Front OE Spring Rate:
Subaru BRZ 27 N/mm (153 lbs/in)
Scion FR-S 23 N/mm (131 lbs/in)

Rear OE Spring Rate:
Subaru BRZ 34 N/mm (195 lbs/in)
Scion FR-S 37 N/mm (211 lbs/in)
Thanks for that. Interesting...basically close to OEM FRS spring rates.

- Andrew
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Old 05-17-2018, 02:01 PM   #34
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Well, if you have extra travel available, you don't need a stiff rate to control movement in as restricted an area.
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Old 05-17-2018, 03:23 PM   #35
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Hmm, it looks, like fronts may become a bit overdamped then?
The fronts are barely softer than stock FR-S, so it may just be sample variation. Impossible to determine that conclusion based on one single spring test. In N/mm it's 22.68 front on Chuhatsu vs 23 on stock FR-S.
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Old 06-24-2018, 09:29 PM   #36
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Are there any installation instructions in English? Any North American suppliers?
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Old 06-26-2018, 05:01 PM   #37
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Are there any installation instructions in English? Any North American suppliers?
https://frsport.com/chuhatsu-plus-cp...z-zn6-zc6-2013

No need for installation instructions in English unless you're doing spring installation for the first time ever.
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Old 06-28-2018, 10:27 AM   #38
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this is exactly what I need. Now to decide whether to use OEM dampers or get Konis...
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Old 06-28-2018, 11:35 AM   #39
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If not the shortages of Bilstein, i'd also think of B6. Otherwise .. OEMs, if they are in good shape. Used MY2017 when they appear among classifieds. Koni yellows? Hmm, also probably may work.
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Old 06-28-2018, 02:27 PM   #40
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If not the shortages of Bilstein, i'd also think of B6. Otherwise .. OEMs, if they are in good shape. Used MY2017 when they appear among classifieds. Koni yellows? Hmm, also probably may work.
I've had a set for sale for dirt cheap for months... A little damage, but they still work. I don't think anyone really wants them. "Coilovers and slammy McSlamerson, camber, Bruh."
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Old 08-07-2019, 12:56 AM   #41
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Quote:
Originally Posted by mav1178 View Post
I finally got them tested at Eibach.

Chuhatsu lift springs:
Front: 129 lbs/in
Rear: 206 lbs/in

For comparison purposes:

Car: Front OE Spring Rate:
Subaru BRZ 27 N/mm (153 lbs/in)
Scion FR-S 23 N/mm (131 lbs/in)

Rear OE Spring Rate:
Subaru BRZ 34 N/mm (195 lbs/in)
Scion FR-S 37 N/mm (211 lbs/in)
Hi Mav, are the OE springs used for comparison on the BRZ, from the older MY or 2017MY?
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Old 08-07-2019, 11:29 AM   #42
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Hi Mav, are the OE springs used for comparison on the BRZ, from the older MY or 2017MY?
Data pulled from other parts of the forum.
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