M.Bonanni Project 370Z V3.0 | Clean Slate

the_student

suscribed again lol. i unsuscribed after the last two times i thought you were going to get rid of the car lol.

__________________
2009 370Z PW 6MT Base/Sport/KW/PWJDM/HKS...RIP.

2011 370Z PW 6MT Base/Sport...KW V3/HKS/TE37 SL/Clear Bra

SPOHN

That's a good theory Mike and considering the Vette guys have had the same issue. I assume with your theory the ABS doesn't know how to count for less rotational weight and throws it into ice mode believing it lost traction. Not sure myself. Just throwing that out there. But even so our cars shouldn't have a feature like this.

Glad the splitter worked for you. I'm adding some canards come this weekend.

OS Giken! It's the greatest. So simple.

__________________

travisjb

Mike, if the issue were that tied to the tire circumference, don't you think we would have heard more about it from all the street-oriented folks that are running 20" wheels etc? Also, as you know, I ran those Firebird tracks for a couple years on all manner of tire sizes... I had the most trouble on Firebird "East" with Ice Mode - same for you? the main track was not so bad... I resolved the East track issue by turning ABS off, playing with suspension settings, tire pressures and brake compounds, until I got to a point where braking was optimal... before that with ABS off, the fronts would lock up in almost every braking zone

__________________
2009 370Z #104
*For Sale*

Mike

I don't think its tire size either. I have run several square setups with tires 2" shorter than stock up to slightly larger than stock and have had no issues with it.

Maybe its calibrations of the ABS computer and I'm just lucky mine isn't as sensitive as most?

__________________
NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968

M.Bonanni

Travis, so far I have had this hyper-sensitive ice mode issue on both Firebird West and Buttonwillow. How did you disconnect the ABS without disconnecting the VVEL? And what pad compounds did you end up with?

__________________
MikeBonanni.com
Twitter: http://www.twitter.com/MikeBonanni
Facebook: http://www.facebook.com/MBonanni36
Function > Form

ChrisSlicks

Get hold of a spare fuse module (order from a dealer or online). Pop the cover off the fuse module and snip the fuse for the ABS. Swap modules back and forth as required.

__________________
Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

M.Bonanni

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.

__________________
MikeBonanni.com
Twitter: http://www.twitter.com/MikeBonanni
Facebook: http://www.facebook.com/MBonanni36
Function > Form

ChrisSlicks

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.

__________________
Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

PapaJFresh

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.

__________________
2011 370Z 7AT Touring + Sport + Navi | Stillen G3 CAI | Berk HFC | F.I. CBE CF 18" res | 13.295 @ 102.88 mph

Mike

couldn't you just pull the ABS fuse?

__________________
NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968

travisjb

Pull ABS fuse or disconnect a wheel rate sensor. Both will do it. (all the usual disclaimers for other people reading this...)

I remember running the West track a little over a year ago now... here it is in my journal TravisJB Journal

I did in fact have a couple major ice mode issues there now that I think back to it... coming out of the carousel approaching the turn before start/finish... car locked up a couple times... can't remember which pads I was running probably on page 40-45 somewhere, or maybe a bit later, sorry

I remember thinking this was not a temp issue, but a wheel hop and differential spin rate issue, which is driven by suspension tuning and of course overly conservative abs algorithms

some vid here as well
TravisJB Track Video

__________________
2009 370Z #104
*For Sale*

Perf.Des

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.

__________________
Perf.des carbon and paint//Bride//Personal//Stillen//ARK//Jegs//Zex//RUFF//Eibach

M.Bonanni

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.

__________________
MikeBonanni.com
Twitter: http://www.twitter.com/MikeBonanni
Facebook: http://www.facebook.com/MBonanni36
Function > Form

ChrisSlicks

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.

__________________
Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

M.Bonanni

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?

__________________
MikeBonanni.com
Twitter: http://www.twitter.com/MikeBonanni
Facebook: http://www.facebook.com/MBonanni36
Function > Form