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Old 09-18-2019, 11:47 PM   #3669
R2
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Originally Posted by Racecomp Engineering View Post
Front:
Front control arm (front) bushing.
Whiteline ALK
steering rack bushings


Rear:
trailing arm front
crossmember inserts
diff bushings

rear upper control arm bushings (either the camber adjustable or the fixed)

I bolded the ones I recommend most and are the better bang for the buck. The others are good too. Might as well do as many as you can stand at the same time since they're almost all kind of a pain to install.

- Andy
It’s been a few years; do you still feel this list is accurate?
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Old Yesterday, 10:43 AM   #3670
tane
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I am looking to do a suspension upgrade this winter and this is a really great thread. I have a track oriented ’14 BRZ that sees light daily driving. I have upgraded brakes and exhaust/tuning. I generally like the way the car handles on the track, but am looking to increase overall grip, and reduce some of the understeer on corner exit of big sweepers (I am destroying RF tires on a mostly left turn track). I have Michelin PS4S (225/45 R17) and want to stay with those rather than go to a more focused track tire (Cup 2 or other).

I am thinking of something like Ohlin R&T with camber plates. To target something like -2 degrees camber upfront. At stock height I have -1.25 negative camber in rears right now (and zero camber upfront). I will want to test out stock height vs say a 20mm drop to see the difference.

Here is my confusion. I have been told that Ohlin suggests spring rates of 50N/m (443 lbs/in) front and back. And they say those springs were sized assuming that you keep the OEM anti-sway bars in place (18mm and 14mm).

This was surprising to me. This thread seems to suggest that using a combination of softer springs and stiff bars (like the OEM set up) is an “older” approach to suspension and that it is better to try to get the spring rates right directly and then use bars only to tune balance preference.

At 443 lbs/in, this seemed to imply that without the bars, Ohlin was targeting something that had similar stiffness upfront to the OEM, but 35% more stiffness in the rear (using the really great “wheel rate” data on a related suspension model thread https://www.ft86club.com/forums/show...t=26661&page=8). For a road and track suspension, this seemed like a good place to start.

But if you keep the OEM 18mm/14mm bars attached and just add the Ohlins, that is increasing a lot of stiffness all around (plus adding more in the back).

Which outcome was Ohlin targeting when they recommended 50N/m springs in their coilovers?

Or am I misunderstanding something here?
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Old Yesterday, 11:07 AM   #3671
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Originally Posted by R2 View Post
It’s been a few years; do you still feel this list is accurate?
Yes....but...I wish there was an easier or different solution to the ALK. It's a fine piece but not what I really want in that spot.

- Andrew
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Old Yesterday, 01:00 PM   #3672
Racecomp Engineering
 
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Quote:
Originally Posted by tane View Post
I am looking to do a suspension upgrade this winter and this is a really great thread. I have a track oriented ’14 BRZ that sees light daily driving. I have upgraded brakes and exhaust/tuning. I generally like the way the car handles on the track, but am looking to increase overall grip, and reduce some of the understeer on corner exit of big sweepers (I am destroying RF tires on a mostly left turn track). I have Michelin PS4S (225/45 R17) and want to stay with those rather than go to a more focused track tire (Cup 2 or other).

I am thinking of something like Ohlin R&T with camber plates. To target something like -2 degrees camber upfront. At stock height I have -1.25 negative camber in rears right now (and zero camber upfront). I will want to test out stock height vs say a 20mm drop to see the difference.

Here is my confusion. I have been told that Ohlin suggests spring rates of 50N/m (443 lbs/in) front and back. And they say those springs were sized assuming that you keep the OEM anti-sway bars in place (18mm and 14mm).

This was surprising to me. This thread seems to suggest that using a combination of softer springs and stiff bars (like the OEM set up) is an “older” approach to suspension and that it is better to try to get the spring rates right directly and then use bars only to tune balance preference.

At 443 lbs/in, this seemed to imply that without the bars, Ohlin was targeting something that had similar stiffness upfront to the OEM, but 35% more stiffness in the rear (using the really great “wheel rate” data on a related suspension model thread https://www.ft86club.com/forums/show...t=26661&page=8). For a road and track suspension, this seemed like a good place to start.

But if you keep the OEM 18mm/14mm bars attached and just add the Ohlins, that is increasing a lot of stiffness all around (plus adding more in the back).

Which outcome was Ohlin targeting when they recommended 50N/m springs in their coilovers?

Or am I misunderstanding something here?
Hmm...I think we're missing something here. First up, you probably meant 50 N/mm (not N/m) and that does not convert to 443 lbs/in...it's around 285 lbs/in.

To make it more simple, are you comparing these 3 hypothetical set ups with your tires?

1. Stock
2. Ohlins with 50 N/mm springs
3. #2 but with stiffer swaybars

- Andrew
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