That's what I was thinking to do for my next competition. I really really would like to try to figure this problem out, what triggers it, what helps it, etc. but I probably should wait and do that during a regular track weekend instead of a competition weekend.

Were you running the DTC pads? Which compound in the rear?

The DTC's are a little weird on the torque curve as they come up to temp, I remember having some ABS issues with them until they hit the sweet spot in certain braking zones.

In the beginning I thought tire size might be a factor, but I run the same tire size now as I did back then and have had various other combinations and nothing has really made a difference in that regard. Pad compound however has been #1 in controlling the ABS issue. Low torque, low grab but high temp is what works best.

Mike, I was talking with one of the mechanics for the SFR world challenge team and he said that Nissan was looking into an ABS solution for them and would have it ready before Long Beach.

You may want to check with them and see their approach to the problem.

I'll put money on them installing a race ready ABS system. :)

For the front aero balance issue, what Ive done in the past is put slits in the vertical plane between the horizontal plane and the actual bumper (but low enough that the slits are under the front tray panel). Then to adjust downforce, just tape off sections of the slits.

Worked pretty well for me at Road America.

This time I was on DTC-30 front and HP+ rear. I had to brake so lightly that I have completely ruled out pad compound. Theres another guy I know of running DTC-60 pads without ice mode and he is on stock wheels/tires.

Would be awesome, but I would be surprised if they made it available to the public.

Pretty good idea. Hoping I can get a wing on the car and balance it out with that, but chances are looking slim for that to happen in the coming weeks before my next competition. Might try your method or just make a new splitter that has less surface area.

HP+ is more grabby than DTC-30 at lower temperatures, that is my guess as to what was causing the problem. Get rid of the HP+ in the rear and go with something more compatible and it should be good.

This happened with DTC pads out back too, and I have run HP+ on this car before without any issues whatsoever back in 2009 when I was first tracking the car. It's hard to explain, but I can't stress enough just how little brake pressure it would take to get into Ice Mode. So little pressure was used that I don't think it could possibly be the pad compound anymore.

Now I have been asking everyone and their brother about their thoughts on this and I have a new suggested theory, and that's air in the ABS system. Anyone ever experienced this? Are there any other signs that this would be the cause of the ultra hyper sensitivity?

It certainly could cause this especially if air was in the front lines or a single rear line. It would cause a brake pressure imbalance would could cause one wheel to lock prematurely and activate the ABS.

Do you think that air could have been introduced when you had the calipers off? If the air is in the ABS system itself then you will need someone with the Nissan scan tool to put the controller into bleed mode.

Could have been when I sent the calipers off to get powdercoated. That's one of the only things that could have happened between my last track day back in 2010 where I didn't have this issue and these past two current track days.

that could be it. As for the HP+ pads. I used them on my first outing in the car at Znationals on a small track and ran them down to the backing plates in one 20 minutes session. Didn't have ice mode though.


You might want to take the car to a dealership and have them bleed the ABS pump with the consult.

Video I made of my Fast Intentions exhaust installation with a short sound clip of it at the end!

Nice

I know in working with grand am team engineers they were pretty convinced the issue is related to rears having far too much bias. They left area before I had a chance to go to smaller 350z Brembo rear caliper.

Have you kept notes on how much fuel you have and rear tire condition when you experience ice mode? I can tell you my car locks up rears more often even with 5 gallons less than full. Also suspension settings have had influence - lack of bump in dampers in front allow too much weight transfer allowing rear lockup too.

Our cars are nose heavy. Shift weight off light rears quickly and what do have? ...ice. Add poorly programmed abs ice mode and you have constant ice mode issue when you try aggressive late braking.

But it might be air in ABS system? all of us having same issue? Would like to hear more on this theory.

niceee man! I saw Sebs car from s7 on the back lift. I love your Z man, Its inspiring to see your progress~

Jason