Ohlins Road & Track for FRS/BRZ suspension install/review thread

[Sleepypistonracing]

Originally Posted by ajc209

Probably better for RCE to answer, but I am using the stock 60N/60N MI20 kit with AD08R 235/40/18 and OEM sways. I like this setup, not too much roll but enough to get a feel for the grip levels. Also the softer rates mean crappy bumpy tracks are not an issue.



I think if you were go go for more grippy tyres like AD048s, then 8kg/8kg would help control body roll.



Is your car lighter than stock?

Cheers

It weighs 1215kg without me in it so a bit lighter than stock.

People are laughing at my rates over here. Even if I would go 8/8 they would still laugh😂

[ajc209]

Originally Posted by Sleepypistonracing

Cheers

It weighs 1215kg without me in it so a bit lighter than stock.

People are laughing at my rates over here. Even if I would go 8/8 they would still laugh😂

Well spring rates are one thing, but really you want to look at wheel frequencies which take into account the corner weights.

60N springs are still about 1.9Hz front and 1.8Hz rear which (generally) is about as far as you'd want to go on a high performance steer tyre like the AD08R without downforce.

[Sleepypistonracing]

Originally Posted by ajc209

Well spring rates are one thing, but really you want to look at wheel frequencies which take into account the corner weights.



60N springs are still about 1.9Hz front and 1.8Hz rear which (generally) is about as far as you'd want to go on a high performance steer tyre like the AD08R without downforce.

😄 I'm using track spec louvers and a SARD wing. Would you say it's enough to be able to go up further?

[ajc209]

Originally Posted by Sleepypistonracing

😄 I'm using track spec louvers and a SARD wing. Would you say it's enough to be able to go up further?

The SARD wing supposedly make downforce. Any idea how much? Cant be too much by the way its mounted on the boot lid.

[Sleepypistonracing]

Originally Posted by ajc209

The SARD wing supposedly make downforce. Any idea how much? Cant be too much by the way its mounted on the boot lid.

Not so sure about the sard, but the louvers increases front downforce by 49%! O dont think the SARD does that much even though mine have extended brackets so that it is further back!

[Sleepypistonracing]

Originally Posted by Sleepypistonracing

Not so sure about the sard, but the louvers increases front downforce by 49%! O dont think the SARD does that much even though mine have extended brackets so that it is further back!

[ajc209]

Originally Posted by Sleepypistonracing

Not so sure about the sard, but the louvers increases front downforce by 49%! O dont think the SARD does that much even though mine have extended brackets so that it is further back!

I know the louvers decrease under hood pressure by 40 -odd % but downforce?

[Sleepypistonracing]

Originally Posted by ajc209

I know the louvers decrease under hood pressure by 40 -odd % but downforce?

Sorry I mixed them up! They were banned in some racing series I Dubai for giving too much down force. How much it is, I don't know.

[Icecreamtruk]

By the size of the wing, and comparing it to a APR GTC-200, I'd say it could generate anywhere from 40% to 60% of the APR's numbers. Those numbers are up for display on APR's website. From experience I can tell you, for example, that my car goes from very neutral (minor slight oversteer) at minimum wing angle to understeering pig at max angle and that the speed at the end of an 800m straight is 15km/h slower at max angle with the APR wing. You can totally feel that wing working back there and 8k springs in the rear feel kind of soft with it. So I'd venture to say the sard is at least making enough downforce to negate all of the lift the rear generates and then some.

[Sleepypistonracing]

Originally Posted by Icecreamtruk

By the size of the wing, and comparing it to a APR GTC-200, I'd say it could generate anywhere from 40% to 60% of the APR's numbers. Those numbers are up for display on APR's website. From experience I can tell you, for example, that my car goes from very neutral (minor slight oversteer) at minimum wing angle to understeering pig at max angle and that the speed at the end of an 800m straight is 15km/h slower at max angle with the APR wing. You can totally feel that wing working back there and 8k springs in the rear feel kind of soft with it. So I'd venture to say the sard is at least making enough downforce to negate all of the lift the rear generates and then some.

Brilliant! I'll try to get some 7/7kg springs and install during the season. Crashed in the rain during the last race and have some repairs ahead of me.

[Icecreamtruk]

Originally Posted by Sleepypistonracing

Brilliant! I'll try to get some 7/7kg springs and install during the season. Crashed in the rain during the last race and have some repairs ahead of me.

Ouch that hurts. I hope you can get it all repair and running soon. Rain can be a bitch sometimes.

[Sleepypistonracing]

Originally Posted by Icecreamtruk

Ouch that hurts. I hope you can get it all repair and running soon. Rain can be a bitch sometimes.

Thanks! I'm not gonna pollute this thread with what happened and what's going on but it was a hard hit and it is crazy that the car is even repairable. Check out my project thread here or Sleepy Piston Racing on FB and you'll see the gopro video!

[thetyrant]

Just to add to this thread as well, im in the market for new suspension to replace Tein Streetflex that was on car when I bought it, having had Ohlins R&T on 3 previous cars ive been researching and speaking to owners with them on these cars to see what people think, like most I was most concerned about the spring rate drop on MP20 but after speaking to my contact at Ohlins im confident for UK roads it will work well, probably too soft for track as you would expect but will be interesting to find out as firmest is not always fastest way


I was lucky to find another GT86 locally who has the new MP20 Ohlins kit fitted and he was kind enough to let me have a good drive of car earlier this week to get a feel for it, I was impressed that despite the soft spring rates it still felt very good and no doubt the higher spring preload and quality dampers play a big part in it all, I didnt push car crazy hard as it wasn't mine (despite owner asking me to!) but you could feel rear was a tad on softer side and turn in under power wasn't the best (lack of neg camber playing a part as below), however was very planted and soaked up the bumps well enough, I think either an uprated ARB or touch firmer on rear springs and it will be nice balance.


One thing we both felt was the lack of Negative camber from using stock top mount dulled the turn in, my car is currently back onto bone stock suspension bar Whiteline camber bolts giving around -1.5deg and felt much nicer for it, finding a solution for the camber on Ohlins will be my first job and im told camber bolts don't fit easily but not sure on details yet, there are a few top mount options much cheaper than Ohlins ones which add nearly another 50% onto price of basic kit!


Anyhows after the testdrive Im now in process of ordering my Ohlins MP20 kit and looking forwarding to fitting and playing around with it


Certainly for track users you need to uprate the springs to at least the 60N from older kits and im assured the damper valving hasn't been changed so no problems with those or even 70n springs, my car will is 80% road, 10% track and 10% sprint events so will be interesting to see what I end up with after playing with springs etc.


Ian

[churchx]

thetyrant: have you tested just on "UK roads" or also been on track? And what tires car had?
In addition to whiteline bolts on top hole one can use SPC ones at lower hole for extra camber. LCA for rear neg. camber will be needed though (one can change bushings to eccentric ones, but parts+labour may cost almost what cheapest rear aftermarket LCAs cost and adjusting is more hassle with just bushings).