Rear roll center correction - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

gpvecchi · 01-03-2025, 10:12 AM

I fit a front roll center correction (lowered 30 mm), I can feel the benefits.
But now, what about the rear?

Racecomp Engineering · 01-03-2025, 11:07 AM

I don't know of anything that you can bolt on easily.

I've been tempted to drill a hole upwards for the inner mounting point of the rear lower control arm but it's not exactly easy. Something like this:

- Andrew

gpvecchi · 01-03-2025, 01:37 PM

There are some japanese brands that have arms for that, but they clam that the ride height will change a lot, like 2 cm.

marco_mc22 · 01-03-2025, 03:04 PM

I think the cheapest mod would be fitting adjustable upper arm bushings, moving the arm in a slightly better position. Ideally you have to raise the inner part (subframe side).

Anyway...considering how the rear end of this car behaves, I wouldn't worry much about the rear RC, especially within 25mm of lowering.

SPL if I'm not wrong makes adjustable shims and bushings for the entire subframe, but raising RC would increase Anti-squat, so you might need a traction mod as well...

01-03-2025, 10:12 AM	#1
gpvecchi Senior Member Join Date: Mar 2018 Drives: Toyota 86 GT Limited PP (Model G) Location: Italy Posts: 1,029 Thanks: 407 Thanked 347 Times in 195 Posts Mentioned: 14 Post(s) Tagged: 0 Thread(s)	Rear roll center correction I fit a front roll center correction (lowered 30 mm), I can feel the benefits. But now, what about the rear?

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01-03-2025, 11:07 AM	#2
Racecomp Engineering Join Date: Nov 2011 Drives: 2016 BRZ, 2012 Paris Di2 & 2018 STI Location: Severn, MD Posts: 5,479 Thanks: 3,511 Thanked 7,369 Times in 3,013 Posts Mentioned: 308 Post(s) Tagged: 9 Thread(s)	I don't know of anything that you can bolt on easily. I've been tempted to drill a hole upwards for the inner mounting point of the rear lower control arm but it's not exactly easy. Something like this: - Andrew

01-03-2025, 01:37 PM	#3
gpvecchi Senior Member Join Date: Mar 2018 Drives: Toyota 86 GT Limited PP (Model G) Location: Italy Posts: 1,029 Thanks: 407 Thanked 347 Times in 195 Posts Mentioned: 14 Post(s) Tagged: 0 Thread(s)	There are some japanese brands that have arms for that, but they clam that the ride height will change a lot, like 2 cm.

01-03-2025, 03:04 PM	#4
marco_mc22 Senior Member Join Date: Jun 2017 Drives: Toyota 86 Location: Italy Posts: 138 Thanks: 42 Thanked 74 Times in 57 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I think the cheapest mod would be fitting adjustable upper arm bushings, moving the arm in a slightly better position. Ideally you have to raise the inner part (subframe side). Anyway...considering how the rear end of this car behaves, I wouldn't worry much about the rear RC, especially within 25mm of lowering. SPL if I'm not wrong makes adjustable shims and bushings for the entire subframe, but raising RC would increase Anti-squat, so you might need a traction mod as well...

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