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

[jvincent]

Engine oil:

You are at 6 months, so you are due on time. As far as mileage goes, if you are tracking frequently, change it at 3K miles tops or every 3 or 4 track days, whichever comes first.

Transmission/differential:
Unless you are tracking really often, once a year is probably fine.

[EAGLE5]

Originally Posted by troek

project mu hc-cs, yes to pedal dance. and hks coil overs. do it at home alignment, and zero signs of any uneven toe wear, but thats not to say my alignment is perfect, its just not eating tires. hankook rs3 205/55r16 on 7" rim.

Left foot braking? That has been known to confuse the stability control, but I haven't heard of it being an issue in a straight line.
If the rears lock first, it will squirm. Those are more dual-purpose pads than track pads.
How good are your home alignment skills? I would get that checked.

I think the rears are locking first if it's only happening when you really, really, really brake hard.

[CSG Mike]

Originally Posted by troek

last time at the track i was testing my brakes/bravery and braking later and later each lap from about 220kph to about 60-70kph. when i started really pushing it and really standing on the brakes, i started to notice some wiggle. it was definitely discomforting. is this normal under severe braking, or is there an issue? brake pads and rotors all look fine, tires almost new. alignment problems?

Are you ABS braking or just threshold? Pedal dance active? VSC?

[troek]

Originally Posted by CSG Mike

Are you ABS braking or just threshold? Pedal dance active? VSC?

Threshold braking, pedal dance.

[CSG Mike]

Originally Posted by troek

Threshold braking, pedal dance.

Perhaps the pads are heating up unevenly front/rear, causing a bias shift as the sessions runs? HC-CS is pretty consistent until it gets toward the upper end of the heat range (600C+)

[troek]

Originally Posted by jsimon7777

Left foot braking? That has been known to confuse the stability control, but I haven't heard of it being an issue in a straight line.
If the rears lock first, it will squirm. Those are more dual-purpose pads than track pads.
How good are your home alignment skills? I would get that checked.

I think the rears are locking first if it's only happening when you really, really, really brake hard.

Yeah im trying to avoid the crazy high price of alignments here lol. I feel 0 abs intervention, so that leads me to believe the rears arnt locking first

[troek]

Originally Posted by CSG Mike

Perhaps the pads are heating up unevenly front/rear, causing a bias shift as the sessions runs? HC-CS is pretty consistent until it gets toward the upper end of the heat range (600C+)

My fronts seem to get significantly hotter judging by the burnt color on the back of the pad. The rear are still legible

[EAGLE5]

Bad alignment, bad caliper, bad suspension component, or improper suspension install/setup?

[ddeflyer]

Originally Posted by jvincent

Engine oil:

You are at 6 months, so you are due on time. As far as mileage goes, if you are tracking frequently, change it at 3K miles tops or every 3 or 4 track days, whichever comes first.

Transmission/differential:
Unless you are tracking really often, once a year is probably fine.

I would add that you should get a used oil analysis too. When the oil costs $100 a change the $25 that black stone charges can be worth alot. Also it can let you know if you have something unusual happening in the engine before it grenades.

I was changing more frequently than I needed to, UOA is saying 8-10 track days and 5K miles on my car with 300V 0w20 (and of course that is going to be different for different people! don't assume your oil will last the same as mine).

[CSG Mike]

Originally Posted by troek

My fronts seem to get significantly hotter judging by the burnt color on the back of the pad. The rear are still legible

I would recommend installing front brake ducts, or try HC+ in the rear so that the rear temp goes up faster.

[Apex_BRZ]

That sounds like a LOT of track abuse and miles for oil. How often are people generally changing oil when tracking their cars?

[jvincent]

Originally Posted by ddeflyer

I would add that you should get a used oil analysis too. When the oil costs $100 a change the $25 that black stone charges can be worth alot. Also it can let you know if you have something unusual happening in the engine before it grenades.

I was changing more frequently than I needed to, UOA is saying 8-10 track days and 5K miles on my car with 300V 0w20 (and of course that is going to be different for different people! don't assume your oil will last the same as mine).

Sorry for the slight off topic here.

I've been struggling with the validity of data from a UOA for the track. As I understand the process, they measure for wear metals and the current viscosity. I don't believe they address viscosity at high temps. So, while a really bad number can be a sign of wear, it's probably too late at that point and a "good" wear report may not be indicative of degraded high-temp viscosity, which is what we care about.

Personally I'd rather change the oil more frequently, a change only costs me ~$60, for the peace of mind.

[Pat]

Originally Posted by Apex_BRZ

That sounds like a LOT of track abuse and miles for oil. How often are people generally changing oil when tracking their cars?

That was my thought, also. My car has no power modifications. I drive it at it's limit on the track, and typically get in four 15 minute sessions each day. I don't have an oil cooler, and am concerned about getting it too hot, so I don't drive the full 20 minutes. I change the oil after ever track weekend (two days). I have never done a UOA, so I don't know if that's good or bad. It's just what I do.

Which brings up another question. How long does it take for oil to get too hot? I know this can be a gray area, but am I helping to protect the car at all by cutting my sessions a little short? I have not measured temps.

[ddeflyer]

Originally Posted by Pat

That was my thought, also. My car has no power modifications. I drive it at it's limit on the track, and typically get in four 15 minute sessions each day. I don't have an oil cooler, and am concerned about getting it too hot, so I don't drive the full 20 minutes. I change the oil after ever track weekend (two days). I have never done a UOA, so I don't know if that's good or bad. It's just what I do.

Which brings up another question. How long does it take for oil to get too hot? I know this can be a gray area, but am I helping to protect the car at all by cutting my sessions a little short? I have not measured temps.

These cars heat up their oil really fast and even on stock power they get it pretty scary hot (unless you've added an oil cooler).