Braking bad...

Skipperdoodle · 08-04-2018, 11:08 AM

Hey guys!

So I’ve done a couple of track days and mountain runs with my Z since purchasing it in April. I have noticed some very odd things while under braking. Not necessarily hard braking, or consistent locations. Sometimes when I’m entering a corner the fronts will trigger the anti lock system and I’m not even on the brakes that hard. Other times I’m in the brakes hard and deep and the car brakes real nice. It’s not a consistent experience at all. My car is stock, with the exception of slotted front rotors and Motul RBF 600. I have no idea what kind of pads are in it, there is lots of meat on the pads still and I’m not going to replace them for better pads until they’re gone. I’m running bf Goodrich comp 2 a/s tires. I know they’re not great at all, but the dealer slapped them on new when I bought the car. So again, I’m not replacing them with something better until they’re wasted.

Usually when it triggers, I have to just deal with the resulting understeer by mashing the gas to get the rear to swing around. (which is one thing the Z does really, really well imo)

It’s my opinion that the electric nannying in our cars is far too invasive. The traction control system cuts in at the littlest bit of slip and the abs triggers whenever it wants. I’ve read some threads about ice mode triggering and I wondering if that’s what I am experiencing. Is there any way to just shut down anti lock? Help, questions and comments are all appreciated thanks in advance guys!

SouthArk370Z · 08-04-2018, 02:00 PM

Are you sure tire diameters are in spec?

Skipperdoodle · 08-04-2018, 02:50 PM

Pretty sure they’re in spec. They are the OEM sizes for the wheels. They’re not flat spotted or anything.

Rusty · 08-05-2018, 09:27 PM

Do you have the VDC off? If not. It will apply brake pressure to a rear wheel to straighten the car out. Most times when it happens. It will point you in the wrong direction.

JARblue · 08-05-2018, 09:59 PM

Quote:

Originally Posted by Rusty

Do you have the VDC off? If not. It will apply brake pressure to a rear wheel to straighten the car out. Most times when it happens. It will point you in the wrong direction.

ABLS still applies the rear brakes when wheel slip is detected even if VDC is off

DIY Yaw Sensor rocker switch

Rusty · 08-05-2018, 10:07 PM

Quote:

Originally Posted by JARblue

ABLS still applies the rear brakes when wheel slip is detected even if VDC is off

DIY Yaw Sensor rocker switch

Not as much. But it will still do it.

JARblue · 08-05-2018, 10:12 PM

Quote:

Originally Posted by Rusty

Not as much. But it will still do it.

Very true. ABLS is far less invasive than VDC. But it still can catch you off guard at the limit, especially if you're not expecting it.

Rusty · 08-05-2018, 10:15 PM

Quote:

Originally Posted by JARblue

Very true. ABLS is far less invasive than VDC. But it still can catch you off guard at the limit, especially if you're not expecting it.

.........and it will always point you in the wrong direction.

dts3 · 08-06-2018, 12:30 AM

Maybe a flakey wheel speed sensor?

Skipperdoodle · 08-06-2018, 02:55 PM

Can uprev or ECUTEK tuning shut all of that "ABLS" along with traction control down entirely?

How would I know if a wheel speed sensor is bad?

Rusty · 08-06-2018, 03:31 PM

Quote:

Originally Posted by Skipperdoodle

Can uprev or ECUTEK tuning shut all of that "ABLS" along with traction control down entirely?

How would I know if a wheel speed sensor is bad?

If it was a wheel speed sensor. You would have a CEL.

Spooler · 08-06-2018, 06:26 PM

Quote:

Originally Posted by Rusty

If it was a wheel speed sensor. You would have a CEL.

That's not always the case. I have fixed several cars that had no CEL. It was caused by a wheel speed sensor that was reading low.

Rusty · 08-06-2018, 06:42 PM

Quote:

Originally Posted by Spooler

That's not always the case. I have fixed several cars that had no CEL. It was caused by a wheel speed sensor that was reading low.

Hmmmmm...........never come across that yet. The ones I replaced had a CEL.

Spooler · 08-06-2018, 06:52 PM

Quote:

Originally Posted by Rusty

Hmmmmm...........never come across that yet. The ones I replaced had a CEL.

That is because the resistance was off which is what happens most of the time. I have had a couple I had to put diagnostics on and drive around watching the wheel speed sensors. The other thing I have found is someone who swapped an axle and forgot to transfer the reluctor wheel on the new axle.

dts3 · 08-07-2018, 01:33 AM

Quote:

Originally Posted by Spooler

That's not always the case. I have fixed several cars that had no CEL. It was caused by a wheel speed sensor that was reading low.

Ditto. It's like a half-a** failure. It's strange

08-04-2018, 11:08 AM	#1 (permalink)
Skipperdoodle Base Member Join Date: Apr 2018 Location: Colorado Posts: 11 Drives: 40th anniv. 370Z Rep Power: 7	Braking bad... Hey guys! So I’ve done a couple of track days and mountain runs with my Z since purchasing it in April. I have noticed some very odd things while under braking. Not necessarily hard braking, or consistent locations. Sometimes when I’m entering a corner the fronts will trigger the anti lock system and I’m not even on the brakes that hard. Other times I’m in the brakes hard and deep and the car brakes real nice. It’s not a consistent experience at all. My car is stock, with the exception of slotted front rotors and Motul RBF 600. I have no idea what kind of pads are in it, there is lots of meat on the pads still and I’m not going to replace them for better pads until they’re gone. I’m running bf Goodrich comp 2 a/s tires. I know they’re not great at all, but the dealer slapped them on new when I bought the car. So again, I’m not replacing them with something better until they’re wasted. Usually when it triggers, I have to just deal with the resulting understeer by mashing the gas to get the rear to swing around. (which is one thing the Z does really, really well imo) It’s my opinion that the electric nannying in our cars is far too invasive. The traction control system cuts in at the littlest bit of slip and the abs triggers whenever it wants. I’ve read some threads about ice mode triggering and I wondering if that’s what I am experiencing. Is there any way to just shut down anti lock? Help, questions and comments are all appreciated thanks in advance guys!

08-04-2018, 02:00 PM	#2 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324197	Are you sure tire diameters are in spec? __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

08-05-2018, 09:27 PM	#4 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 34,871 Drives: 2011 Nismo GM 6M Rep Power: 2684436	Do you have the VDC off? If not. It will apply brake pressure to a rear wheel to straighten the car out. Most times when it happens. It will point you in the wrong direction. Hotrodz likes this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

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08-04-2018, 02:50 PM	#3 (permalink)
Skipperdoodle Base Member Join Date: Apr 2018 Location: Colorado Posts: 11 Drives: 40th anniv. 370Z Rep Power: 7	Pretty sure they’re in spec. They are the OEM sizes for the wheels. They’re not flat spotted or anything.

08-06-2018, 12:30 AM	#9 (permalink)
dts3 Track Member Join Date: May 2018 Location: Farmington Hills, MI Posts: 599 Drives: 08 Expedition Rep Power: 6764	Maybe a flakey wheel speed sensor?

08-06-2018, 02:55 PM	#10 (permalink)
Skipperdoodle Base Member Join Date: Apr 2018 Location: Colorado Posts: 11 Drives: 40th anniv. 370Z Rep Power: 7	Can uprev or ECUTEK tuning shut all of that "ABLS" along with traction control down entirely? How would I know if a wheel speed sensor is bad?