Actual Spring difference BRZ vs FRS - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Motopythons · 07-01-2012, 10:17 PM

I found this bit of information regarding the spring rate differences between the twins. The majority of the FRS owners will stick with what they have I assume. But for those BRZ owners who wish to induce a bit more oversteer (while maintaining close to the factory feel):

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)

Source and credit from BRZ Club and Eibach Springs

ayau · 07-01-2012, 10:20 PM

are the dampers also different?

atledreier · 07-02-2012, 01:10 AM

That's a big difference! Surprising.

Good info, thanks!

DarrenDriven · 07-02-2012, 02:03 AM

Cool, thanks for the info.

Can anyone find the OEM part numbers and retail pricing for the stock spring set?

uspspro · 07-02-2012, 02:48 AM

RCE said 185 for both front and rear on the BRZ....

Racecomp Engineering · 07-02-2012, 10:01 AM

Yeah we tested the BRZ springs on a spring tester and saw 185 lbs/in front and rear. Not sure where these numbers are coming from. Also I saw at least 1 other data point agreeing with our measurement.

- Andrew

Dave-ROR · 07-02-2012, 10:16 AM

I'm sending this link to Tony @ Eibach for his input since the OP seems to have implied Eibach measured them.

ZDan · 07-02-2012, 11:08 AM

Might be wheel rates?
(er, scratch that, not likely to get 195 or 211 lb/in wheel rates with 185 lb/in springs...)

uspspro · 07-02-2012, 11:46 AM

Quote:

Originally Posted by Racecomp Engineering

Yeah we tested the BRZ springs on a spring tester and saw 185 lbs/in front and rear. Not sure where these numbers are coming from. Also I saw at least 1 other data point agreeing with our measurement.

- Andrew

Were those springs from a pre-production car? Not sure if that matters, just thinking.

denkigrve · 07-02-2012, 12:04 PM

EDIT:
Original spring rates that were measured were based off of the Toyota 86 in Japan.

DarrenDriven · 07-02-2012, 12:06 PM

I thought that the Subaru was supposed to be more softly sprung and the FR-S a bit stiffer?

vividracing · 07-02-2012, 12:47 PM

Quote:

Originally Posted by ayau

are the dampers also different?

Probably not. Those rates are close enough that the OEM dampers could be engineered to handle both fairly well.

Sam Strano · 07-02-2012, 12:49 PM

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.

Dave-ROR · 07-02-2012, 12:52 PM

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.

07-01-2012, 10:17 PM	#1
Motopythons Let it rain! Join Date: May 2012 Drives: 2012 Subaru Imprezza Location: Richmond, BC Posts: 124 Thanks: 41 Thanked 42 Times in 19 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Actual Spring difference BRZ vs FRS I found this bit of information regarding the spring rate differences between the twins. The majority of the FRS owners will stick with what they have I assume. But for those BRZ owners who wish to induce a bit more oversteer (while maintaining close to the factory feel): 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) Source and credit from BRZ Club and Eibach Springs __________________ "If you no longer go for a gap that exists, you're no longer a racing driver." - Ayrton Senna

07-02-2012, 10:16 AM	#7
Dave-ROR Site Moderator Join Date: Dec 2010 Drives: Stuff Location: Florida Posts: 10,317 Thanks: 955 Thanked 5,965 Times in 2,689 Posts Mentioned: 262 Post(s) Tagged: 8 Thread(s)	I'm sending this link to Tony @ Eibach for his input since the OP seems to have implied Eibach measured them. __________________ -Dave Track cars: 2013 Scion FRS, 1998 Acura Integra Type-R, 1993 Honda Civic Hatchback DD: 2005 Acura TSX Tow: 2022 F-450 Toys: 2001 Chevrolet Corvette Z06, 1993 Toyota MR2 Turbo, 1994 Toyota MR2 Turbo, 1991 Mitsubishi Galant VR-4 Parts: 2015 Subaru BRZ Limited, 2005 Acura TSX Projects: 2013 Subaru BRZ Limited track car build FS: 2004 GMC Sierra 2500 LT CCSB 8.1/Allison with 99k miles

07-02-2012, 12:52 PM	#14
Dave-ROR Site Moderator Join Date: Dec 2010 Drives: Stuff Location: Florida Posts: 10,317 Thanks: 955 Thanked 5,965 Times in 2,689 Posts Mentioned: 262 Post(s) Tagged: 8 Thread(s)	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. __________________ -Dave Track cars: 2013 Scion FRS, 1998 Acura Integra Type-R, 1993 Honda Civic Hatchback DD: 2005 Acura TSX Tow: 2022 F-450 Toys: 2001 Chevrolet Corvette Z06, 1993 Toyota MR2 Turbo, 1994 Toyota MR2 Turbo, 1991 Mitsubishi Galant VR-4 Parts: 2015 Subaru BRZ Limited, 2005 Acura TSX Projects: 2013 Subaru BRZ Limited track car build FS: 2004 GMC Sierra 2500 LT CCSB 8.1/Allison with 99k miles

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07-01-2012, 10:20 PM	#2
ayau Senior Member Join Date: Nov 2011 Drives: Some rust bucket Location: Polar ice cap Posts: 3,058 Thanks: 312 Thanked 1,045 Times in 556 Posts Mentioned: 37 Post(s) Tagged: 0 Thread(s)	are the dampers also different?

07-02-2012, 02:48 AM	#5
uspspro Senior Member Join Date: Mar 2012 Drives: DGM BRZ, MR-S 3.5L V6 swap (sold) Location: Bay Area, CA Posts: 602 Thanks: 28 Thanked 188 Times in 121 Posts Mentioned: 1 Post(s) Tagged: 1 Thread(s)	RCE said 185 for both front and rear on the BRZ....

07-02-2012, 10:01 AM	#6
Racecomp Engineering Join Date: Nov 2011 Drives: 2016 BRZ, 2012 Paris Di2 & 2018 STI Location: Severn, MD Posts: 5,416 Thanks: 3,439 Thanked 7,280 Times in 2,968 Posts Mentioned: 304 Post(s) Tagged: 9 Thread(s)	Yeah we tested the BRZ springs on a spring tester and saw 185 lbs/in front and rear. Not sure where these numbers are coming from. Also I saw at least 1 other data point agreeing with our measurement. - Andrew

07-02-2012, 11:08 AM	#8
ZDan Senior Member Join Date: May 2011 Drives: '23 BRZ Location: Providence, RI Posts: 4,597 Thanks: 1,382 Thanked 3,909 Times in 2,039 Posts Mentioned: 85 Post(s) Tagged: 0 Thread(s)	Might be wheel rates? (er, scratch that, not likely to get 195 or 211 lb/in wheel rates with 185 lb/in springs...)

07-02-2012, 12:49 PM	#13
Sam Strano Senior Member Join Date: Jun 2012 Drives: 2013 FR-S Asphalt Location: Brookville PA Posts: 345 Thanks: 1 Thanked 223 Times in 108 Posts Mentioned: 8 Post(s) Tagged: 1 Thread(s)	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.

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