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

ChrisSlicks

No, for a security convention. We had to visit one of our clients in North Las Vegas while we were here yesterday.

This day job stuff is messing up my racing schedule

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

Mike

My buddy Terry is working that show too.

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

M.Bonanni

In "Track Mode" ready to rock for the Tuner Shootout this weekend!

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Boost_lee

Nice, good luck!

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My TT Z

NYBladeZ

Hey Mike wanna buy back that Kognition wing I bought off you before? I only ask because I'm selling the car

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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling

M.Bonanni

Maybe...PM me a price.

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M.Bonanni

The 2012 Modified Tuner Shootout is in the books! I wish I could say everything went as planned, but yet again my day was plagued with incredibly sensitive "Ice Mode." Good news is, after talking with one of the guys from Whiteline, I have a new theory that I have high hopes for being the cause of this level of sensitivity. Now before I get on with this new theory, realize that I am not saying that this is the case of "ice mode" and the level of severity of my particular case the last two track days is what is in question. The past two track days I have hit ice mode in every braking zone every time. It's sensitive to the point where to avoid it, I have to be so light on the brake pedal that the engine is actually slowing the car down more than the brakes. So long story short, I now think it has to do with tire size, overall diameter to be exact. Corvettes apparently have the same problem. Went online and calculated and sure enough my front tires are over 4% smaller overall diameter than stock and my rears a little over 2%. I am going to research it more but from what I have found so far, you want to be within 3% of stock overall diameter to avoid ABS issues. Currently I am on a 275/35/18 on the front for the track. Tire size in a taller sidewall gets a little limited but Hankook does make an RS-3 tire in 265/40/18 which should be well within "spec." I will have to sacarafice a bit of width, but thats way way way better than not being able to use my brakes. So thats going to be the next test, assuming that I can get a set of 265/40/18s in time for my next event in 3 weeks. I am also going to bring stock brake pads to try out in case the tire size thing doesn't fix it.

I admittedly don't know much about how ABS systems or car electronics work so if there's anyone out there that has some insight on this tire size theory, feel free to chime in. As mentioned, my current track setup is 275/35/18 front, 285/35/18 rear.

In other news, my home-made splitter worked really really well. Even though the track Ir an today was small, very small, like didn't even get into 4th gear small, it was very noticeable that the car had a ton more front aero grip, even at those speeds making the car very loose through the higher speed stuff. I can imagine it will be much worse at a larger track. So there are now two ways to go with this. Number one is to add more aero to the rear with a big 'ol wing. That would be best case, but its expensive and I only have 3 weeks to my next event. Next solution is to make a new splitter that is shorter to reduce front aero. Going to try really hard to get a wing as that's the more beneficial situation.

The OS Giken LSD was absolutely phenomenal. Nothing much more to say about it other than that it is a tremendous advantage over the stock viscous LSD.

Fast Intentions exhaust and UpRev tune by Specialty Z worked awesome as well. Everyone loved the sound and the powerband was super smooth and responsive.

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the_student

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

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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.

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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

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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?

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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?

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Mike

couldn't you just pull the ABS fuse?

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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

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2009 370Z #104
*For Sale*

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.

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