[ims]

So took the car to the track the other day (Dunnville) open lapping it was fun, a lot of fun. I developed a lot more respect for the car while driving home. However, "UNDERSTEER" the car has tons of understeer and I know coilovers, sway bars, or maybe m3 suspension upgrade would do the trick BUT I have these wheels that rub in the back, every hard bend especially left turns the rear would rub and sometimes hard enough to act like brakes.

This got really annoying but I still managed to overtake cars like Carrera S, 4S, e46 M3, Supra turbo, etc. On the straights the car does phenomenaly well Im no rush anymore to get a ECU tune now I want to get rid of the under steer and rubbing.

My question is if I go for coilover suspension will the stiffness be enough to prevent my rear from rubbing? or will the height drop make it still rub?

Can I improve my handling without lowering any height at the rear and lower it just in the front?

Advice, input, opinion, comments all welcome...

[who's ur daddy?]

Think you should get properly fitted rims and tires for the track. Going at such high speeds and dramatic direction changes - last thing you'd want is to have a tire blowout.

In any event, to reduce understeer, go with a square setup. Anything that would put more rubber up front would be great. Staggered setups just enhance the understter effect by putting too much grip in the rear relative to the front - thus understeer. Sways are another option.

[Orb]

Originally Posted by ims

So took the car to the track the other day (Dunnville) open lapping it was fun, a lot of fun. I developed a lot more respect for the car while driving home. However, "UNDERSTEER" the car has tons of understeer and I know coilovers, sway bars, or maybe m3 suspension upgrade would do the trick BUT I have these wheels that rub in the back, every hard bend especially left turns the rear would rub and sometimes hard enough to act like brakes.

This got really annoying but I still managed to overtake cars like Carrera S, 4S, e46 M3, Supra turbo, etc. On the straights the car does phenomenaly well Im no rush anymore to get a ECU tune now I want to get rid of the under steer and rubbing.

My question is if I go for coilover suspension will the stiffness be enough to prevent my rear from rubbing? or will the height drop make it still rub?

Can I improve my handling without lowering any height at the rear and lower it just in the front?

Advice, input, opinion, comments all welcome...

Well, it seems you bought the wrong wheels...bite it and sell them as you made a mistake. If your rubbing you messed up your scrub radius and causing more under steer. Before you waste your money on another set wheels do try to learn something scrub radius and king pin inclination offset. Changing wheel offset is the same as changing control arms lengths.

Yet another square setup recommendation which only decrease initial under steer and then increase it mid corner only to cause massive over steer late exit. Supper cars are all staggered.....wonder why!!!!!!

The M3 sway bars are the only thing that will help.

Orb

[who's ur daddy?]

Originally Posted by Orb

Yet another square setup recommendation which only decrease initial under steer and then increase it mid corner only to cause massive over steer late exit. Supper cars are all staggered.....wonder why!!!!!!

orb, what does this mean?

[MRQturbo]

a set of springs...some sway bars...lsd...and you'll notice a huge difference in handling and driving....roll your fenders or get proper sized track tires too.....

[Gen_E92]

Like Orb said, I'm starting to understand that square tire set up only solves part of the problem while creating other problems. If you have the money, definitely go for M3 front control arms, set of coilovers with M3 rear camber link, M3 subframe bushings, M3 sway bars, and a LSD.

[jeho]

gen_e92 is in

u got some balls to continue tracking your car that day when you were already rubbing haha...

[Gen_E92]

Originally Posted by J86

gen_e92 is in

u got some balls to continue tracking your car that day when you were already rubbing haha...

dude thats long time ago lol...it doesn't rub when i autox, but normal driving rubs lol

so glad I learned trail braking haha...my car used to understeer as well even with the H&R sway bar when i just brake like a noob but no more understeer with trail braking and still staggered tires adding all the M3 stuff should be perfect now

[ims]

wheel suggestions... nothing beats these RD2's in looks

[samchoi604]

Install LSD and push the gas pedal a little harder when you corner. Say bye to understeer, but say hello to oversteer, and hope you don't crash the car lol.

[Soni]

Originally Posted by ims

wheel suggestions... nothing beats these RD2's in looks

Looks and Performance sometimes doesn't come together!! What I suggest is use the RD2 for road use and get a light track rims with some R compound, you will amaze how much gripping has improved.

[Tonybest]

Originally Posted by Soni

Looks and Performance sometimes doesn't come together!! What I suggest is use the RD2 for road use and get a light track rims with some R compound, you will amaze how much gripping has improved.

Use R compound only if you're an advanced driver. ie many HPDE or similar events. You cannot learn the basics if your car grips tremendously. You get better learning experience if you start off with regular high performance street tires.

my humble opinion...

[Gen_E92]

Originally Posted by samchoi604

Install LSD and push the gas pedal a little harder when you corner. Say bye to understeer, but say hello to oversteer, and hope you don't crash the car lol.

Yep...adding LSD and suspension tuning will be the proper way to fix your underteer problems. Going with square tire set up is a compromise for the stock open diff IMO, although turn in is slightly faster, you won't have enough grip coming out of corners.

Originally Posted by Tonybest

Use R compound only if you're an advanced driver. ie many HPDE or similar events. You cannot learn the basics if your car grips tremendously. You get better learning experience if you start off with regular high performance street tires.

my humble opinion...

+1

[Soni]

Originally Posted by Tonybest

Use R compound only if you're an advanced driver. ie many HPDE or similar events. You cannot learn the basics if your car grips tremendously. You get better learning experience if you start off with regular high performance street tires.

my humble opinion...

+1...
I would suggest take the BMW training courses to learn the basics!