Ice mode solution?

MotorvateDIY

Did you know the Nismo Z has a different ABS module than the rest of the 370s? ... and it might be much better?

The non-Nismo ABS module only broadcast the "side g" values (corning g forces) on the CAN bus. BUT the Nismo ABS module has "side g" and "acceleration / braking g" forces. It doesn't seem to have a sensor for braking/acceleration forces.

I wonder if this extra data can prevent ice mode?
In theory, if you are braking at 1.0+g and the wheels are moving a different speeds (like on ice), it should know it isn't "on ice" and not get into ice mode.

How did I find this out?

With the CAN bus reverse engineering I have done for the "GTR MFD Converter" that will allow any 370/G37 with nav to enable the GTR gauges, I came across this.
Below are some screen captures from the GTR MFD (actually my 2011 G37 Nav system, reconfigured for GTR gauges) showing the braking and acceleration screens with data from when I played back a CAN bus log file from a 2016 Nismo Z (6MT).

On a non-Nismo 370, the brake/acceleration screens always show 0. I looked at the CAN bus data, and it has a bunch of zeros for the braking/acceleration g forces in the data stream.



I guess the (silly) question is: Has any Nismo Z had "ice mode" at the track?
(silly, because I suspect NO ONE tracks their Nismo)

Maybe a Nismo ABS module in a non-Nismo Z the cheaper solution to ice mode???

For reference:
ABS module part numbers:
6MT 47660-3GM3B
7AT 47660-3GM1B

The 6MT Nismo ABS module is about $1400 new from Nissan
(https://parts.nissanusa.com/p/ABS-Hy...660-3GM3B.html)

One last point:
The "yaw sensor" (aka side g sensor) is the same on all 370 and G37. Either 49731-1EA1A or 49731-JK00A.
This is on a dedicated CAN bus directly to the ABS module and only senses/provides "side g" forces on that CAN bus.

This suggests the Nismo ABS module has the braking/acceleration sensor built into it.

Thoughts?

Attached Images

370Z Nismo_sm.jpeg (137.8 KB, 135 views)

Averying

Hope people chime in here and can get you some real world data. Is this for both V1 & V2 Nismos?

Always enjoy reading your posts. Keep it up!


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MotorvateDIY

Great question!
Based on the part Number I gave (6MT: 47660-3GM3B, 7AT: 47660-3GM1B) those are listed as valid for June 2014+ production, so that would mean V2.

If I can get a CAN bus log from a V1 Nismo, I can find out in 30 seconds if the braking/acceleration data is there. I'll try to find a V1 Nismo locally... However just about all the good cars are put away for the winter, so this may need to wait until spring

Rusty

I track my 2011 Nismo. Never had ice mode. But had the VDC do some weird chit.

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MotorvateDIY

I'm guessing the car is stored away for the winter right now.
When is the next time it is on the road or at an event?

SeeThruHead

2017 Nissan 370Z Nismo Trackday / Clubsport / GT

if you read this thread
i don't think StanPoland would have done the teves mod if the Nismo didn't have ice mode issues.

His is a 2018 nismo v2.

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MotorvateDIY

Good point.
I guess the question is: was he being pro-active to prevent a future problem, or reactive to fix the issue?

Anyways... as time permits, I'll continue to look into this. Maybe there is something here, or maybe there isn't. You don't know until you look

Elmo370z

Yaw switch delete, running the proper brake compound, and not stabbing the brakes. I’ve never had issues with ice mode or my buddy with a v1 nismo.

NorthStyle

What brand/compounds are you running recently? Most of the people I recall not having issues were those running "staggered" compounds front/rear.

BillyBoy

I’ve got a few friends here down under that are wondering about this as a way to potentially lessen the likelihood of ice mode issues. Did you ever find some more evidence to support (or possibly rule out) your hypothesis, and figure out whether zeta was just being pro-active?

MotorvateDIY

Nope. The Nismo Z ABS module sends out additional data on the CAN bus. That got me thinking that maybe it is more track focused... BUT it has been reported here that the Nismo also has the ice mode issue... so I've hit a dead end.

abm89

I've had friends hit ice mode on the NISMO 370Zs. Notably the V1

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MotorvateDIY

Thanks for this info and I'll keep that in mind.
Next spring summer, I hope to record a few 370z CAN bus to see what the ABS module is sending out.

FUN FACT:
The 2018+ 370z have an OBD gateway and need a special cable to record the vehicle CAN bus. I've made a few and I'm ready!

abm89

No issues with carbotech 12/10s here with the yaw switch disabled. As mentioned, good braking technique is also key.

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Elmo370z

It was an huge upgrade from the car or tech xp12/10