Another Ice Mode Thread
I went out for my first Elise track day in my new-to-me Elise yesterday (I've done probably ~80 track days in various other cars), and immediately got to re-live my old hell -- Ice Mode. From reading a bunch of threads, it seems like no one has really nailed this one down fully.
I ran an Elise in 08-09 in SS for autocross and regularly ran into the ice mode problem when I least wanted it, and could never find a really repeatable cause for it. The best I could figure out was that it seemed to be when you caused any ABS event while the car was even slightly turned, but sometimes that worked and sometimes it didn't for me.
Fast forward to my track day yesterday, and I had 2 really close calls due to ice mode, which is making me really want to track this down, if possible. Our local track has a high speed sweeper into a pretty big braking zone for a lower speed corner, so you're going from ~98mph down to ~50mph, usually starting to roll into your braking while still turned from the previous corner a bit. After one event where I came around there and ice moded straight off the track (fortunately this corner has quite a bit of runoff), I started playing around with it a bit more. It was actually fairly repeatable -- if the wheel was turned at all when you got into the brakes hard, ice mode kicked in and the brakes do nothing. I spent the rest of the day making sure I was only braking in incredibly straight lines, and only had the problem once more when I tried a slightly different line through a corner and ended up braking in a slight corner, which, of course, kicked it right in again.
I'm on stock calipers/discs/lines, upgraded fluid, and carbotech AX6 pads (hybrid autocross pad with decent but not really high temp sensitivity). My autocross car had the same exact setup. I've never tried another setup, so there may be something sensitive about these pads that cause the ABS system to hate it more than other setups.
The car is lowered, on penske doubles, and BWR FSB, with other misc mods, so it really shouldn't be picking up a wheel in a lightly-turned braking event, so it seems likely to be some other sort of thing that the ABS hates.
Any thoughts about how to improve the situation? Different caliper balance, adjustable brake bias to move more to rears help? Just different pad altogether?
David de Regt - Bellevue, WA