Does AH activate even when not flashing on the DIC? Dad used up rear pads in 2 days!
10-15-2007, 10:55 AM
#1
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CI 3-5-6-7-8 Veteran
Does AH activate even when not flashing on the DIC? Dad used up rear pads in 2 days!
My father put on brand new oem Z06 pads in prep for the synergy fall fling at VIR-full this weekend. He runs on Kumho ecsta MXs w/ oem pads.
At the end of the last session yesterday he came in and the rears were metal/metal. He said he heard/felt nothing on the track, then when he got in the pits it started scraping.
The fronts were fine, but sure enough the rears were shot as are the rotors. We threw on a spare set of carbotech xp10s I had so he could drive home to Greensboro.
I'd heard about AH wearing out rear pads... but a brand new set on one weekend is that reasonable?
Also, he swears he wasn't using AH much.... at least not on the DIC... I can't remember, does it activate even w/o displaying?
At the end of the last session yesterday he came in and the rears were metal/metal. He said he heard/felt nothing on the track, then when he got in the pits it started scraping.
The fronts were fine, but sure enough the rears were shot as are the rotors. We threw on a spare set of carbotech xp10s I had so he could drive home to Greensboro.
I'd heard about AH wearing out rear pads... but a brand new set on one weekend is that reasonable?
Also, he swears he wasn't using AH much.... at least not on the DIC... I can't remember, does it activate even w/o displaying?
10-15-2007, 11:47 AM
#4
Le Mans Master
I think it will always flash on the DIC but only briefly and when it does you are likely busy with other stuff, hence it kicking on in the first place. 
I would say as you drive harder it does make lots of little corrections that may not be felt inside the car, only the larger "fixes" are felt.
Having driven VIR I would say that 2 days on OEM rear pads under those conditions is about right, XP-8's or 10's would have faired better.
I would say as you drive harder it does make lots of little corrections that may not be felt inside the car, only the larger "fixes" are felt.
Having driven VIR I would say that 2 days on OEM rear pads under those conditions is about right, XP-8's or 10's would have faired better.
10-15-2007, 12:15 PM
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The 2001 cars have DRP and Rear Stability Control which does the following:
When the vehicle performs a high speed turn or curve, the EBCM will enter rear stability control mode. The vehicle speed is greater than 48 km/h (30 mph) and the vehicle lateral acceleration is greater than 0.6 g. The vehicle will exit rear stability control when the vehicle speed is less than 40 km/h (25 mph) or the vehicle lateral acceleration is less than 0.4 g.
During a rear stability control event, the EBCM performs a pressure increase on the outside rear brake and a pressure hold on the inside rear brake. The driver may hear the pump motor run and may feel a vibration in the brake pedal.
This is in addition to active handling.
What you are supposed to do when AH activates is to steer the car in the direction you want to go in. This is normal skid reaction. However, just keep it in that direction and AH will do the response better than you can as it has more precise control over the car than you do since it can apply the brake to just one wheel to yaw the car the way it has to go. Don't fight it use it.
Go find a large empty parking lot and try use it to find out how it responds when you are purposely forcing it to activate.
Bill
When the vehicle performs a high speed turn or curve, the EBCM will enter rear stability control mode. The vehicle speed is greater than 48 km/h (30 mph) and the vehicle lateral acceleration is greater than 0.6 g. The vehicle will exit rear stability control when the vehicle speed is less than 40 km/h (25 mph) or the vehicle lateral acceleration is less than 0.4 g.
During a rear stability control event, the EBCM performs a pressure increase on the outside rear brake and a pressure hold on the inside rear brake. The driver may hear the pump motor run and may feel a vibration in the brake pedal.
This is in addition to active handling.
What you are supposed to do when AH activates is to steer the car in the direction you want to go in. This is normal skid reaction. However, just keep it in that direction and AH will do the response better than you can as it has more precise control over the car than you do since it can apply the brake to just one wheel to yaw the car the way it has to go. Don't fight it use it.
Go find a large empty parking lot and try use it to find out how it responds when you are purposely forcing it to activate.
Bill
10-15-2007, 06:55 PM
#7
Melting Slicks
Bill, thanks for the input, is the 2002 and newer cars different or are the
2000 and older cars different, from what you list as the mode in 2001?
I run with AH on at both Sears Point and at Laguna Seca and while
front pads go 3 or 4 days, the rears last at least twice as long. That is
with Perf. Friction -x pads and stock rotors.
The key from my POV is to smooth out the inputs.
Randy
2000 and older cars different, from what you list as the mode in 2001?
I run with AH on at both Sears Point and at Laguna Seca and while
front pads go 3 or 4 days, the rears last at least twice as long. That is
with Perf. Friction -x pads and stock rotors.
The key from my POV is to smooth out the inputs.
Randy
10-15-2007, 10:23 PM
#8
Instructor
As an instructor, I wouldn't move a student up to an advance group if he/she was still using stability control.
I've also seen BMW TC melt pistons tracking in the rain...
I've also seen BMW TC melt pistons tracking in the rain...
10-16-2007, 03:18 AM
#9
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The 2001 cars have DRP and Rear Stability Control which does the following:
When the vehicle performs a high speed turn or curve, the EBCM will enter rear stability control mode. The vehicle speed is greater than 48 km/h (30 mph) and the vehicle lateral acceleration is greater than 0.6 g. The vehicle will exit rear stability control when the vehicle speed is less than 40 km/h (25 mph) or the vehicle lateral acceleration is less than 0.4 g.
During a rear stability control event, the EBCM performs a pressure increase on the outside rear brake and a pressure hold on the inside rear brake. The driver may hear the pump motor run and may feel a vibration in the brake pedal.
This is in addition to active handling.
What you are supposed to do when AH activates is to steer the car in the direction you want to go in. This is normal skid reaction. However, just keep it in that direction and AH will do the response better than you can as it has more precise control over the car than you do since it can apply the brake to just one wheel to yaw the car the way it has to go. Don't fight it use it.
Go find a large empty parking lot and try use it to find out how it responds when you are purposely forcing it to activate.
Bill
When the vehicle performs a high speed turn or curve, the EBCM will enter rear stability control mode. The vehicle speed is greater than 48 km/h (30 mph) and the vehicle lateral acceleration is greater than 0.6 g. The vehicle will exit rear stability control when the vehicle speed is less than 40 km/h (25 mph) or the vehicle lateral acceleration is less than 0.4 g.
During a rear stability control event, the EBCM performs a pressure increase on the outside rear brake and a pressure hold on the inside rear brake. The driver may hear the pump motor run and may feel a vibration in the brake pedal.
This is in addition to active handling.
What you are supposed to do when AH activates is to steer the car in the direction you want to go in. This is normal skid reaction. However, just keep it in that direction and AH will do the response better than you can as it has more precise control over the car than you do since it can apply the brake to just one wheel to yaw the car the way it has to go. Don't fight it use it.
Go find a large empty parking lot and try use it to find out how it responds when you are purposely forcing it to activate.
Bill
10-16-2007, 11:21 AM
#11
Safety Car
The 2001 cars have DRP and Rear Stability Control which does the following:
When the vehicle performs a high speed turn or curve, the EBCM will enter rear stability control mode. The vehicle speed is greater than 48 km/h (30 mph) and the vehicle lateral acceleration is greater than 0.6 g. The vehicle will exit rear stability control when the vehicle speed is less than 40 km/h (25 mph) or the vehicle lateral acceleration is less than 0.4 g.
During a rear stability control event, the EBCM performs a pressure increase on the outside rear brake and a pressure hold on the inside rear brake. The driver may hear the pump motor run and may feel a vibration in the brake pedal.
This is in addition to active handling.
Bill
When the vehicle performs a high speed turn or curve, the EBCM will enter rear stability control mode. The vehicle speed is greater than 48 km/h (30 mph) and the vehicle lateral acceleration is greater than 0.6 g. The vehicle will exit rear stability control when the vehicle speed is less than 40 km/h (25 mph) or the vehicle lateral acceleration is less than 0.4 g.
During a rear stability control event, the EBCM performs a pressure increase on the outside rear brake and a pressure hold on the inside rear brake. The driver may hear the pump motor run and may feel a vibration in the brake pedal.
This is in addition to active handling.
Bill
10-16-2007, 10:15 PM
#12
I've noticed it working without it lighting up in the dash. I know it was working, even though I didn't see the light, because I could smell the brake dust even when I wasn't using the brakes.
I personally don't like AH at the track. In my experience, I go to correct the car and then the car goes to correct itself. I always end up correcting against the correction. It's very unnerving.
I personally don't like AH at the track. In my experience, I go to correct the car and then the car goes to correct itself. I always end up correcting against the correction. It's very unnerving.
10-17-2007, 09:06 AM
#13
Drifting
a friend of mine had the same problem right before going to nationals. put on new pads and they were gone in a month or so. let me get in touch with him and ill post the response here when i get it.