Got a track related question? I'll try to answer.

[CSG Mike]

Originally Posted by peaches

Anybody here has had the car reach or go past 130MPH? I want to know if you experience vibration or shake. When my car reaches 130 at the track I feel a vibration in the seat (not the steering wheel). I have changed the wheels and tires as it's what everybody said was the problem and there was no change. I have upgraded motor mounts, tranny mount, cf drive shaft, diff brace, clutch, and flywheel.

Any ideas?

You should not be getting any vibrations. Something is loose or worn out, or out of balance.

[Takumi788]

Originally Posted by 86league

Recently have driven on a couple of tracks that have an uphill transition in a heavy braking zone before a corner. I'm using the compression to really help get the car slowed quickly, and am trying to trail brake into the corner.

The steering is really heavy in this circumstance. Normal?

Suspect it is and I'm just now driving hard enough to notice it.

Thanks.

What CSG Mike said. Check your fender liners for damage.

Also the electric power steering stops working when it is stressed too much. It happens to me going into turn 7 at the glen every time. I just muscle through it.

[peaches]

Originally Posted by CSG Mike

You should not be getting any vibrations. Something is loose or worn out, or out of balance.

I'm having the car corner balanced on Wednesday, I will have them check it out

[CSG Mike]

Originally Posted by Takumi788

What CSG Mike said. Check your fender liners for damage.

Also the electric power steering stops working when it is stressed too much. It happens to me going into turn 7 at the glen every time. I just muscle through it.

If electric power steering assist stopped working, you'd get a lighter wheel (at speed), not a heavier one!

Most power steering systems provide a lot of assist at low speed, and then add resistance at high speed, to help stabilize the car.

[Apelsin]

I am wondering if anyone here removed dust shields behind the rotors. Does this help keep brakes cooler? Any downsides?

[gcranston]

Originally Posted by Apelsin

I am wondering if anyone here removed dust shields behind the rotors. Does this help keep brakes cooler? Any downsides?

I have. They were rubbing a bit and making a nasty squealing noise. Hard to say definitively if cooling is better, but maybe a little? No specific downsides to mention so far.

[Apelsin]

Originally Posted by gcranston

I have. They were rubbing a bit

Is it because you have big rotors? Any concerns that without the dust shields the heat from rotors can cause degradation of abs wiring and sensors and etc?

[ka-titties]

Originally Posted by CSG Mike

Your front tires are bottoming out in the wheel well.

I thought these cars have a pretty well known issue with high steering effort under high load situations, like on tracks that have a carousel or similar?

It happens in my car every time at the carousel at NCM, and I know I'm not bottoming out.

[Takumi788]

Originally Posted by ka-titties

I thought these cars have a pretty well known issue with high steering effort under high load situations, like on tracks that have a carousel or similar?

It happens in my car every time at the carousel at NCM, and I know I'm not bottoming out.

Its your power steering. It is a known issue. I went though all of this a year or two ago. I was bottoming out. So I raised the car, now I am not bottoming out but still have the same turning issue. There are a bunch of other threads on this. I choose to ignore it bc it is pretty easy to muscle through.

[Nuts & Bolts Performance]

Originally Posted by Apelsin

Is it because you have big rotors? Any concerns that without the dust shields the heat from rotors can cause degradation of abs wiring and sensors and etc?

Rubbing more than likely came from the dust shields getting bent. It's easy to do when removing and remounting the wheels. Then the dust shield makes contact with the back side of the rotor and makes a "grinding" noise.

The main point of the dust shield is to do exactly like the description, keep dust from components that reside behind it. The other main function is to help keep heat from the brakes off things like ball joints. A combination of corrosive brake dust and heat means that it'll eventually destroy the dust boots of suspension related components.

[treedodger]

Originally Posted by CSG Mike

If electric power steering assist stopped working, you'd get a lighter wheel (at speed), not a heavier one!

Most power steering systems provide a lot of assist at low speed, and then add resistance at high speed, to help stabilize the car.

I've noticed the steering get heavier on high g corners on my stock BRZ w/ stock wheels and 225/17 SX2's. I noticed this on T9 at Laguna, and T3 at Sonoma. No sign of rubbing.

I figured it could also be attributed to g high loads and the self centering forces due to caster angle. Usually the more load the front wheels see, the heavier the steering effort.

It doesn't interfere w/ my driving, so I just muscle through it. No harm, no foul.

Now I would really get worried if the steering wheel got light during a high g turn!!!

[treedodger]

Originally Posted by CSG Mike

If electric power steering assist stopped working, you'd get a lighter wheel (at speed), not a heavier one!

Most power steering systems provide a lot of assist at low speed, and then add resistance at high speed, to help stabilize the car.

Originally Posted by Apelsin

Is it because you have big rotors? Any concerns that without the dust shields the heat from rotors can cause degradation of abs wiring and sensors and etc?

I have.
I also installed Porsche brake ducts that attach to the lower control arms. On my stock car w/ SX2's (TW260 tires), it helps, but I can't say by how much. The inner brake pad wears more slowly than the outers and there is less heat checking (cracking) on the inner surface of the rotor.

I wrapped my lower ball joint and abs sensors w/ reflective heat tape to help protect them from the heat w/out the dust shield.

[ka-titties]

Originally Posted by Takumi788

Its your power steering. It is a known issue. I went though all of this a year or two ago. I was bottoming out. So I raised the car, now I am not bottoming out but still have the same turning issue. There are a bunch of other threads on this. I choose to ignore it bc it is pretty easy to muscle through.

Same... I just muscle through. No sweat.

[Apelsin]

Originally Posted by treedodger

I wrapped my lower ball joint and abs sensors w/ reflective heat tape to help protect them from the heat w/out the dust shield.

Does the tape stay on when the brakes get hot? What kind of tape is it?