Braking problem - malfunctioning ABS

travisjb

Here's another idea... softer anti-sway bars! Very stiff anti-sway bars are going to cause the inside wheel to lift and 'overspin'. When this happens on the rear axle WHILE BRAKING, that's precisely when our problem seems to occur. Compounded by the fact that the rear end is light... Inside rear corner picks up, inside wheel spins faster than outside, ABS reacts to the extreme wheel speed difference by assuming the car is spinning on ice and it uses a VERY AGGRESSIVE slow speed ABS that is locked in until the car reaches nearly a complete stop.

So now I'm contemplating using the softest setting on the rear sway. It will cause more understeer, which I will have to manage some other way. Like perhaps with a square tire setup (275 widths all the way around).

Just a working theory.

I'm very curious to know if anyone has had this problem with the stock sway bars. I'll have to go back and check notes from early last year before I got my sways.

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2009 370Z #104
*For Sale*

spearfish25

This is probably why C&D introduced their Nismo to a concrete wall...

I have a fully stock suspension and have upgraded my brakes with Motul RBF600 fluid and Carbotech XP10/8 pads. I'll be at Gingerman in three weeks and will report back if I get ice'd. Haven't had it happen before though, even on a wet track with stock pads and fluid (not that pads and fluid really have anything to do with it).

Personally, I'd be happy to kill my ABS and threshold brake. I find it very intuitive and would be a nice flashback to driving my landrover defender in the snow.

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2013 Cadillac V-Wagon, RIP Z

travisjb

Had forgotten about the C&D incident until you mentioned it... you must be right - ABS icing.

If there had been a wall nearby yesterday my car would have been toast. If I remember correctly, the car resisted my steering inputs when it went into icing mode, which made the whole process tremendously difficult and frankly dangerous. I wonder if Nissan intended for the car to stop responding to driver steering inputs in this mode? If they did so deliberately, I think they have a serious liability that will eventually catch up with them and unfortunately some poor driver(s).

Re threshold braking, it is only a solution for a select few drivers. I've driven karts and formula cars like this but for a TT car that I'm pushing to the absolute limit, I like the idea of having ABS to fall back upon. I'd much prefer a real fix to this issue vs disabling.

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2009 370Z #104
*For Sale*

kannibul

More chassis stiffening might help too.