Actual Spring difference BRZ vs FRS

[vividracing]

Originally Posted by Sam Strano

I think the thinking was the Subaru has stiffer front springs to promote more understeer at the limit which is more in keeping with what is typical of a Subaru car. Scion wanted the car more free, hence the softer front springs. But to counter that the Scion has front struts that are valved differently (stiffer). I suspect they are stiffer on compression a bit, not sure how much more, if any more, rebound they possess.

Has it been confirmed that they're different? If so, that's awesome. Most manufacturers would've engineered something that isn't optimal for either spring rate but works fairly well. Using 1 strut saves money.

[Jackson]

Originally Posted by Dave-ROR

Eibach has another set of springs they are going to test to confirm today. I'm sure either Tony will post in here or I'll get an email from him at some point.

Hey guys, Tony from Eibach here.

I just got confirmation on the second set of springs we tested. The first set was a Premium model with the rates posted above by the OP. The second set of BRZ springs was from a Limited model and we just tested them this morning and it has the exact same rates as posted and the Premium model.

These were both production models from local BRZ owners. We never bothered rate testing the pre-production models we used months ago because we knew the rates would most likely change on the production run.

[DarrenDriven]

Hey Tony, did you guys run the tests on the FR-S springs as well?

[Wepeel]

Originally Posted by Jackson

Hey guys, Tony from Eibach here.

I just got confirmation on the second set of springs we tested. The first set was a Premium model with the rates posted above by the OP. The second set of BRZ springs was from a Limited model and we just tested them this morning and it has the exact same rates as posted and the Premium model.

These were both production models from local BRZ owners. We never bothered rate testing the pre-production models we used months ago because we knew the rates would most likely change on the production run.

Thanks for the confirmation

[Jackson]

Originally Posted by DarrenDriven

Hey Tony, did you guys run the tests on the FR-S springs as well?

Yes, we did. The rates the OP posted are from our testing. An email broadcast was sent out just this morning to all of our distributors and dealers announcing the new BRZ/FR-S kit with our specs and OE specs.

Originally Posted by Motopythons

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)

[Wepeel]

Originally Posted by Jackson

Yes, we did. The rates the OP posted are from our testing. An email broadcast was sent out just this morning to all of our distributors and dealers announcing the new BRZ/FR-S kit with our specs and OE specs.

What are the Eibach spring specs (rate, drop)?

[Dave-ROR]

Originally Posted by Wepeel

What are the Eibach spring specs (rate, drop)?

Prokit is 1" front and rear, part # 82105.140

Sportline is 1.4" front and rear, part # 4.10582

I don't have the rates for either.

They are also working on some other stuff as well, but I'll let Tony post that info once it's available.

[Draco-REX]

I wonder where the discreprency between RCE's measured rates and Eibach's measured rates come from.

[denkigrve]

Originally Posted by Draco-REX

I wonder where the discreprency between RCE's measured rates and Eibach's measured rates come from.

Most likely, pre-production suspension setup that was changed last minute before production began. I imagine it still had the JDM suspension setups while they were ironing out the USDM setups.

[Racecomp Engineering]

That's seems to be the case. Interesting either way. The shock dyno was done a production set of dampers which is the important part and we did more of our testing on the production car.

- drew

[Dave-ROR]

Originally Posted by Draco-REX

I wonder where the discreprency between RCE's measured rates and Eibach's measured rates come from.

Possible pre-production vs production?

[Racecomp Engineering]

That's what we're guessing. Shock dyno was done on production version though (thankfully).

- Andrew

[Dimman]

Originally Posted by Racecomp Engineering

That's what we're guessing. Shock dyno was done on production version though (thankfully).

- Andrew

Did you chuck your originals? Can you retest?

I'm curious about maybe different rates for different countries.

Did Eibach USA test their own or was this info passed down from Germany?

[Dave-ROR]

Originally Posted by Dimman

Did you chuck your originals? Can you retest?

I'm curious about maybe different rates for different countries.

Did Eibach USA test their own or was this info passed down from Germany?

Tested local owners vehicles in Cali, including a set today.

The ones RCE tested with was a pre-prod car but I would guess they'd still have the OEM springs from Miles car.