GTS wing compared to std rear lip spoiler

[Expressivedrives]

Hi, does it make sense to add wing to improve rear traction in fast 4th gear turns or even improve acceleration from 3rd gear turns?



This is M4 GTS wing indeed, I think that M3 GTS wing is a bit weird....

[dparm]

Are you feeling the rear end of the car getting loose and stepping out on high-speed corners?

[tsk94]

Simply answer: Yes, it will.

There may be other issues at hand that can also help; alignment, damper settings and so on. But in general, additional rear downforce will provide you with more rear end grip - particularly noticeable at higher speeds.

[SYT_Shadow]

I would pair it with a GTS-style front splitter so you balance out the aero, but for sure it makes a difference.

[Expressivedrives]

Originally Posted by dparm

Are you feeling the rear end of the car getting loose and stepping out on high-speed corners?

My main issue is out of corner acceleration. M3 has more power than grip. It becomes so evident, when driving Porsches sometimes, They have due to rear weight much better out-of-corner traction.

[ThunderMoose]

Originally Posted by Expressivedrives

My main issue is out of corner acceleration. M3 has more power than grip. It becomes so evident, when driving Porsches sometimes, They have due to rear weight much better out-of-corner traction.

What tires are you running?

[kyippee]

+1, what tires and suspension?

I'm on JRZ RS One + 700/1000 springs + 295 square nankang AR-1 and corner exit isn't bad, it's more understeer than oversteer for my setup. I have a replica GTS wing but it's more of a spoiler than a wing

[dparm]

Originally Posted by Expressivedrives

My main issue is out of corner acceleration. M3 has more power than grip. It becomes so evident, when driving Porsches sometimes, They have due to rear weight much better out-of-corner traction.

You will never match a rear-engine car when it comes to accelerating out of a corner.

If you are oversteering on corner exit, you can do one of the following:
1. soften front rebound damping
2. soften rear compression damping
3. lower rear ride height or increase front ride height
4. soften rear springs
5. add rear downforce

This is a bit of an oversimplification but should suffice until we have more information. Everything is about compromises. By adding more rear downforce, for example, you might unbalance the aero and cause the front to wash out (understeer) at corner entry.

So to answer your original question: yes, a rear wing will probably help.

[Expressivedrives]

Originally Posted by ThunderMoose

What tires are you running?

Michelin Cup2, 255/35R19 Front, 275/35R19 Rear

[Expressivedrives]

Originally Posted by dparm

You will never match a rear-engine car when it comes to accelerating out of a corner.

If you are oversteering on corner exit, you can do one of the following:
1. soften front rebound damping
2. soften rear compression damping
3. lower rear ride height or increase front ride height
4. soften rear springs
5. add rear downforce

This is a bit of an oversimplification but should suffice until we have more information. Everything is about compromises. By adding more rear downforce, for example, you might unbalance the aero and cause the front to wash out (understeer) at corner entry.

So to answer your original question: yes, a rear wing will probably help.

Thank you for this insightful reply. I start with softening rear suspension and anti roll bar. Currently I run blue H&R anti roll bars front and rear. I bet that stiffening rear bar was wrong...

[rhyary]

Originally Posted by Expressivedrives

Thank you for this insightful reply. I start with softening rear suspension and anti roll bar. Currently I run blue H&R anti roll bars front and rear. I bet that stiffening rear bar was wrong...

I am on 750/1000 with H&R blue and the setup feels very good.

When I put a grippy front Cup2 with Rear RR the car indeed oversteer easily when my rear was setup for less grippy front. I took the rear compression down from HS 16 to 6 and front +1 on HS compression and that helped a lot.

So if you can adjust your compression, there is a good chance you can control your oversteer.

I do have the GTS wing, but my speeds are 110mph - 70mpg and the GTS wing is
mostly for over 120mph and counter the lift, rather than actually creating a downforce.