Braking problem - malfunctioning ABS

RCZ

Well they are completely different driving styles... You can tell immediately when someone who does auto-x goes to the track because their driving is very abrupt and violent vs someone who tracks and is smooth. People who track their car never slam on the brakes, it has to be gradual because of the higher speeds/ loads.

My icemode on the track happened at the end of a long braking zone though...I never went into ABS until I got ice mode

bullitt5897

I am a road track guy so I am used to the 120-60 braking and I havent had ice mode in those type conditions... only in conditions where the car needs to stop at zero and that is only every now and then on certain road conditions.

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daleks

Found this on the StopTech FAQ page and it seems to apply here.

StopTech : Balanced Brake Upgrades

semtex

Interesting. It helps to explain what's going on when this happens braking into a turn. But it doesn't explain why it happens when braking in a straight line. (Just making an observation, not knocking the FAQ or anything.)

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bullitt5897

good read but not the same thing...

What we are refering to is straight line braking. What that FAQ was talking about was corner entry braking or trail braking...

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bullitt5897

DAM you Ben always one step ahead!

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Shop Cars: 2013 318whp Nismo VspecII 370z *SOLD*, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054

semtex

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"There are no small accidents on this circuit." -- Ayrton Senna
316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

Valentino

I'm in the same situation. It really sucks when you can't trust your breaks on the track. when ever I want to do a hot lap and start diving in to corners, the ABS start kicking in and this grinding sound comes on (it sounds like the pads are grinding the disc).

I haven't expiration an ice mode yet. But if we can prevent the ABC from kicking in,That will be nice.

Edit: this only happens when the car is diving in to the corner(trail break), and not in a straight line.

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ChrisSlicks

Ironically the car does really well braking mid corner while unbalanced, it just can't brake in a straight line in certain conditions.

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ChrisSlicks

I think you got pad fade. Pad fade seems to really freak the ABS out because the rear brakes are working but the front brakes aren't at full capacity. End result is the ice-mode behavior but for different reasons.

As I recall you haven't had it since upgrading to track pads correct?

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RCZ

I haven't been to the track in a while so I'm not running upgraded pads at this time. I will be soon though if I don't get that S/C.

memorylasts

I am not to familiar with the 370z braking system yet but if the ABS functions anything like it does in my current and previous car, then if the car sense's that you are at a "high load of lateral force with out applying throttle it will initiate the brakes early, what i read in the OP was that you experiencing the abs activate when you are on the brake about 50% or less are you corner braking? Not to bash in anyway i noticed i did it a couple times and the ABS kicked in, i new i braked to late for a corner and it messed me all up, and i quickly learned to brake a second earlier and keep even on the throttle until you are ready to mash it again.

In my GTI and the current A4 the both do it, it is to makes sure they stop the situation from getting out of control, also keeping the throttle open and even or consistent tells the computer you are doing what you need to do, and doesn't allow the ABS to kick in.

Sorry for skipping the stuff in the middle, and jumping to the end but if anything i hope this is somewhat beneficial.

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ResIpsa

I experienced the dreaded ice mode three times at the NASA Spring Slam on the Summit Point Main Circuit. I am running stock sport wheels with 265/35/19 front and 305/30/19 rear RE-11's. I was also running a custom made set of Porterfield R4 full race compounds (they are awful, noisy, grabby, hard to modulate, dirty...wanna buy my set cheap?) Here are my observations.

The ice mode always happened at the very end of large braking events (turn one and turn five) just before turn in. Before going into ice mode there was no perceivable warning.

It always happened when I came in to the braking zone too fast and needed to sharply increase braking force right before the corner.

By the end of my second day I could pretty much predict when my Z was going to go into ice mode.

Although the ice mode felt like there was no braking force being applied, my 370Z was still slowing.

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ChrisSlicks

Sounds like you were getting pad fade, which certainly does trigger the ice-mode in these cars. Despite the large rotors the heat seems to build up very quickly and there isn't adequate ventilation to dissipate it. But the real problem is something in the programming of the ABS controller isn't quite right, and when you do start to get a little bit of pad fade it steps in and makes things a whole lot worse.

I was getting some ice-mode myself the pass weekend at an auto-cross event. Conditions were pretty treacherous to start with, 40 degrees, drizzle, damp track. Everything started out fine, grip levels were obviously a little lower due to the conditions. But once the front brakes got up to a fairly average 400F I started to get some ice-mode behavior in the 5th, 6th and 7th runs of each session. An yes, this is with the Stillen AP Racing BBK installed.

I'm really beginning to wish that we could use the ABS controller out of the previous gen cars (350/G35) as I don't recall having an ABS issue in those.

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Bluemeanie

The Porsche guys are experiencing the same thing even in the GT3's. Some have gone to a BMW ABS system that cures the problem. The only problem with that is.... it's 10K

Driving style or braking style seems to be the issue according to a response I received. It doesn't have to do with pads, brake fade etc. If someone would pm me their email address I will forward the response to this issue and perhaps it can be posted here.

To be continued...