Ice mode solution?

ChrisSlicks

That is just for the warning when the outside temperature drops to near freezing (37F) or below. It doesn't have any effect on the vehicle systems.

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Crazy4Z

oh ok. thanks for the info.

Shamu

I suspect the car and driver magazine accident was caused by ice mode and not pad failure. I was at the track for past three days and ice mode was activating almost every hard braking turn. It was scary as heck. Suspect if you aren't having issues your not aggressively braking.

I ended up disconnecting the abs fuse which Nissan put in a cluster of 3 fuses. The car with my monster front brakes had a slight rear bias. That rear bias may be the issue. If you are skilled with non abs braking that is cheapest fix.

Honestly I don't want to experience ice mode ever and I don't think pad changes are going to eliminate the issue. I may go with very expensive alternate abs system made for competition later on.

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Grant

ChrisSlicks

Anyone think a proportioning valve may be a viable option? Disable the ABS, dial in the bias to your liking and then re-enable ABS.

Do you have a proportioning valve Travis or did you dial in the bias with pads only?

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flashburn

What front brakes are you running?

Also what pads are you using?

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cossie1600

the added bonus of removing the fuse is disabling the abls right?

car and driver boiled their pads and fluids, it has nothing to do with ice mode. even with ice mode, the car would eventually calm down and slow the car. they went into the wal with lthe pedal sunk to the floor

ResIpsa

So you are saying that you were experiencing ice mode at the track before pulling the abs fuse? And after pulling the fuse, without any other modification to the brakes, you never experienced ice mode again?

If the answer is yes to both questions this really throws a wrench into my theory that ice mode was only related to heat buildup boiling the brake fluid. In my Z, I have completely cured (or I thought) ice mode by upgrading to CarboTech XP10/8 pads, Castrol SRF brake fluid, and brake ducts. Mind you that I run at Summit Point which has only two heavy brake events both under 125 mph.

My problem with the abs theory on this forum was that all the posts seemed to be speculation. I had never seen (or read) any real substantive evidence pointing to the abs. However, if pulling the fuse completely cured the problem this seems to be the first substantive repeatable evidence that there are some gremlins in the abs system.

I think you may have ruined my day…

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ChrisSlicks

I still standby that it is heat related. The heat in the front is either affecting the brake balance or in some other way affecting the ABS system. At auto-x if I spray down the front brakes after each run (yes I know this is very bad) then I don't get ice-mode at all, if I let them ride then I get spontaneous ice mode once the rotors get above 300F (post run measurement).

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Shamu

I don't think so. I had ice mode into first turns with no heat in brakes, had ice mode mid session and late session. My brakes are Brembo competition calipers with huge floating rotors. No over heating.

No balance issue when we disconnected abs. Nothing but solid pedal and awesome braking force.

I had same ice issues with sport brakes, sport rotors and stop tech pads. Used only good Motul fluid and stainless lines. Pedal to the floor and no brake force

I'm still going to try to hook up abs and work on things but honestly my system without abs is balanced and takes a lot to get wheel lock up.

And I still say car and driver experienced ice mode regarless of what was reported.

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Grant

ChrisSlicks

You likely changed the brake balance when installing the competition calipers to something that made sense for a non-abs race setup, however you seriously would have upset the ABS controller by altering the stock brake bias. In a sense you caused the ice-mode yourself by shifting the braking bias to something the ABS computer isn't programmed to handle.

With the stock setup if your pedal went to the floor then it was hydraulic brake fade due to overheating the caliper and boiling the fluid. I experienced that with the stock setup as well.

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