Lowering a PP BRZ: Springs vs Coilovers

[TofuTogue]

Hey everyone!
I currently own a 2017 Subaru BRZ with the Performance package and am looking into lowering the vehicle. I was told that lowering the car with springs would be a good idea since the performance package includes performance dampers. However, I am currently looking into an entry level coilover system by Blitz because of the height adjustment, camber adjustment, and because I would be able to run wider wheels and tires without worrying as much about rubbing on the suspension. If you have any suggestions as to what to do to lower my car, please let me know. I am open to all suggestions.

The coilover system I was looking at is this one by BLITZ:

http://www.ft86speedfactory.com/blit...l#.W3Rj8nMpAwA

As I said, I am open to all suggestions. So if you think there is a better coilover option in the same price range ($800) or a reason why I should run springs instead of coils, I would love to hear what you have to say.

Thank you for your time.

-TofuTogue

[weederr33]

I simply stick with springs since I can get a modest drop of an inch and less stuff to adjust. But coils seem appealing because of the adjustability . I just have no need or reason for a lot of that.

[Racecomp Engineering]

First question I usually have for people is: What type of tire do you plan on running?

Tire choice is one of the main considerations when designing a suspension system. Lower grip tires (like OEM) will not see as much benefit from a stiff coilover set up, while sticky tires will leave a lot on the table with softer springs (like OEM or lowering springs).

Your tire choice will also usually tell me what kind of driving you do or if you have certain race class restrictions. Ultimately a driver that is a thinking about a Bridgestone RE71R or similar probably places a higher priority on ultimate performance than one that is sticking with OEM tires or all seasons. Someone on say Michelin Pilot Sport 4S might be splitting the difference between street and track and would benefit from a softer or midrange coilover.

Tire compound is a LOT more important than tire width btw.

- Andrew

[Racecomp Engineering]

It's also good to ask yourself what benefit a low end coilover actually provides you over the factory shocks.

Stiff springs? Well, that's good if you want stiff springs AND if the valving does a good job handling it.

Height adjustment? Yes, that's nice to have if you want to go lower than 20 to 30mm (generally not great to go lower than that on a set of lowering springs)

Damper adjustment? That can be good, if the adjustments are good and usable. A lot of low end coilovers adjust from soft + crappy to stiff + crappy.

Camber plates? Depends on how much camber and tire you need.

The OEM PP valving is pretty good...not amazing but solid. You're not always making an improvement when you trade that for something shiny that has a knob.

- Andrew

[re-animator]

Originally Posted by Racecomp Engineering

First question I usually have for people is: What type of tire do you plan on running?

Tire choice is one of the main considerations when designing a suspension system. Lower grip tires (like OEM) will not see as much benefit from a stiff coilover set up, while sticky tires will leave a lot on the table with softer springs (like OEM or lowering springs).

Your tire choice will also usually tell me what kind of driving you do or if you have certain race class restrictions. Ultimately a driver that is a thinking about a Bridgestone RE71R or similar probably places a higher priority on ultimate performance than one that is sticking with OEM tires or all seasons. Someone on say Michelin Pilot Sport 4S might be splitting the difference between street and track and would benefit from a softer or midrange coilover.

Tire compound is a LOT more important than tire width btw.

- Andrew

in your opinion, with a track tire like the re71 or falken rt615k+ do lowering springs and a sport damper like the sachs or even koni/bilstein do the job or is the damping/stiffness still subpar for autox and lighter track days?

[Thaeyo]

For that same price range, why not the Tein Flex Z? The Blitz doesn't show what their spring rates are.

[Aluma007]

Originally Posted by Racecomp Engineering

First question I usually have for people is: What type of tire do you plan on running?

Tire choice is one of the main considerations when designing a suspension system. Lower grip tires (like OEM) will not see as much benefit from a stiff coilover set up, while sticky tires will leave a lot on the table with softer springs (like OEM or lowering springs).

Your tire choice will also usually tell me what kind of driving you do or if you have certain race class restrictions. Ultimately a driver that is a thinking about a Bridgestone RE71R or similar probably places a higher priority on ultimate performance than one that is sticking with OEM tires or all seasons. Someone on say Michelin Pilot Sport 4S might be splitting the difference between street and track and would benefit from a softer or midrange coilover.

Tire compound is a LOT more important than tire width btw.

- Andrew

boy is this ever true...found out the hard way. Got the extreme contact sport continentals while still running the stock non PP suspension and the car just hooks. No tire spin whatsoever and the increased roll and sudden feeling of the tire folding over is unnerving. Definitely over tired the car...just have to wait it out and go to a lower class of tire once these wear out. I wouldn't mind some of those CSG tein Flex A's but local alignment people have trouble with just normal car stuff...can't imagine with coilovers. :/

[juliog]

Originally Posted by Aluma007

local alignment people have trouble with just normal car stuff...can't imagine with coilovers. :/

Look for a shop specialized in motorsports alignments. Worth your time and money to get it done right.

[86MLR]

Lowering springs if you care more about looks than handling

Quality coilovers if you care about handling and safety

I have a 17 86 Limited with the PP, the best solution for me was MCA Street Performance coilovers

I did my time with lowering springs in my youth, whilst they are a cheap option to kower your car the negative effects far outweigh any positive

[dhuang]

I have RCE yellows w/ my '17 Series.Yellow (basically PP) and I'm very pleased. Running -1.5 front and getting by with -2 in the rear (no LCAs) with a tad of toe in.

Slight drop and I'm not scraping on anything. Slightly more jarring in certain road conditions but definitely feels more planted mid-corner.

[Racecomp Engineering]

Originally Posted by re-animator

in your opinion, with a track tire like the re71 or falken rt615k+ do lowering springs and a sport damper like the sachs or even koni/bilstein do the job or is the damping/stiffness still subpar for autox and lighter track days?

IMO they do the job for a light track day but there is a lot to be gained on the track from something a little more serious.

- Andrew

[ez8911]

Originally Posted by Racecomp Engineering

IMO they do the job for a light track day but there is a lot to be gained on the track from something a little more serious.



- Andrew

I have Sachs Damper SSC on my 86 and the stock spring rate is a little too soft for wider 235 track tire


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[yurikaze]

I'll be following this thread closely. I'm trying to figure out if I want to change out the stock suspension on my BRZ tS with some tein Flex Z's for a setup I can still daily and adjust on the fly. I'll be running RE71's, but probably only 225 or 235 at most. With the stock setup and the factory PS4's it felt decent on the track, but I could still use some additional grip in lower to mid speed corners.

[ez8911]

Originally Posted by yurikaze

I'll be following this thread closely. I'm trying to figure out if I want to change out the stock suspension on my BRZ tS with some tein Flex Z's for a setup I can still daily and adjust on the fly. I'll be running RE71's, but probably only 225 or 235 at most. With the stock setup and the factory PS4's it felt decent on the track, but I could still use some additional grip in lower to mid speed corners.

I think it is very good choice if you use Flex Z with RE-71R !or PS-4 For the road! If you stick with 225 size tire should be perfect match!


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