Someone help me understand how VSC works...

donee · 12-25-2006, 05:02 PM

Hi BEK,

Yes, that was the jist of my post. If the car does not unintendedly yaw, except when the tires start to slide, the VSC should work only when the yaw is due to sideways tire slide. The result should then be the VSC working for the situations it was designed.

The BT Tech plate turns the car back into what drivers of stock small cars are used to, except for the additional rolling action due to the tall design.

The VSC cannot be designed to fix the chasis flex. It only senses yaw and steering command. If the two do not match, it takes action. Keeping the car stiffer, will make the yaw match steering input more closely in driver controlled manuevers. Which should result in VSC not being triggered unless the tires are sliding sideways. With the body squirminess, the car noticably yaws even when tires are not sliding sideways - the situation the OP was in. If a person can notice this, the VSC sensor can.

Robnerika · 12-26-2006, 06:59 AM

Thanks!

<div class='quotetop'>QUOTE(donee @ Dec 25 2006, 05:02 PM) [snapback]366549[/snapback]</div>

Quote:

Hi BEK,

Yes, that was the jist of my post. If the car does not unintendedly yaw, except when the tires start to slide, the VSC should work only when the yaw is due to sideways tire slide. The result should then be the VSC working for the situations it was designed.

The BT Tech plate turns the car back into what drivers of stock small cars are used to, except for the additional rolling action due to the tall design.

The VSC cannot be designed to fix the chasis flex. It only senses yaw and steering command. If the two do not match, it takes action. Keeping the car stiffer, will make the yaw match steering input more closely in driver controlled manuevers. Which should result in VSC not being triggered unless the tires are sliding sideways. With the body squirminess, the car noticably yaws even when tires are not sliding sideways - the situation the OP was in. If a person can notice this, the VSC sensor can.
[/b]

Bill Merchant · 12-29-2006, 02:34 AM

Stop thinking about it, kdmorse, get better tires!

I think the BT Tech brace is great and highly recommend it, but the first place where slipping occurs is where the rubber meets the road. I'm sure you've read MANY threads here about the driving quality of the OEM tires. On clean, warm, dry roads without curves, they may be OK. On wet roads making 90° turns at greater then "granny speed", they do not yield the performance you desire.

The BT Tech brace will help the mediocre OEM tires grip slightly better, but ComforTreds, HydroEdges, or SVXs will grip better in wet in any case. Get better tires and the BT Tech brace and you'll think your car is on rails. It becomes very hard to activate VSC.

Devil's Advocate · 12-29-2006, 01:04 PM

I trigger the VSC often, usually under heavy breaking when the front tires hit bumps in the road. The effect is that you temprorarily appear to lose braking as the VSC thinks that the bouncing tire (which at that point is locking up) is actually sliding. I am not very impressed with the VSC's response time, but it does do what it is supposed to, correct driving conditions so that the tires stay rolling and on the road.

I can also get the VSC to trigger on dry freeway entry ramps when taken at speed. Its kind of cool to hear the beep beep beep all the way around the ramp. With a little finesse you can actually get a little drift going but not enough to bring the back end around or push the fron t end out from under you.

The key is to know that the VSC one, is somewhat slow to react and two, is not the most intelligent as to your intentions with where you want the car to go.

12-29-2006, 02:34 AM	#13
Bill Merchant absit invidia Join Date: May 2005 Location: USA \| Oregon \| Portland area \| 97004 \| Posts: 4,100 My Car: 2007 Prius Model: Package: #5 Thanks: 18 Thanked 10 Times in 8 Posts Friends: 60	Stop thinking about it, kdmorse, get better tires! I think the BT Tech brace is great and highly recommend it, but the first place where slipping occurs is where the rubber meets the road. I'm sure you've read MANY threads here about the driving quality of the OEM tires. On clean, warm, dry roads without curves, they may be OK. On wet roads making 90° turns at greater then "granny speed", they do not yield the performance you desire. The BT Tech brace will help the mediocre OEM tires grip slightly better, but ComforTreds, HydroEdges, or SVXs will grip better in wet in any case. Get better tires and the BT Tech brace and you'll think your car is on rails. It becomes very hard to activate VSC. __________________ Bill Bill.Merchant@PortlandHSD.info 2007 NL 5 Silver Wraith • 2005 BC 6 Silver Cloud Portland Area HSD Meetup Group: PortlandHSD.info Become carbon neutral: Carbonfund.org or TerraPass.com > < Follow me on

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12-25-2006, 05:02 PM	#11
donee Senior Member Join Date: Aug 2005 Location: Chicagoland Posts: 2,244 My Car: 2006 Prius Model: Package: #2 Thanks: 2 Thanked 54 Times in 47 Posts Friends: 0	Hi BEK, Yes, that was the jist of my post. If the car does not unintendedly yaw, except when the tires start to slide, the VSC should work only when the yaw is due to sideways tire slide. The result should then be the VSC working for the situations it was designed. The BT Tech plate turns the car back into what drivers of stock small cars are used to, except for the additional rolling action due to the tall design. The VSC cannot be designed to fix the chasis flex. It only senses yaw and steering command. If the two do not match, it takes action. Keeping the car stiffer, will make the yaw match steering input more closely in driver controlled manuevers. Which should result in VSC not being triggered unless the tires are sliding sideways. With the body squirminess, the car noticably yaws even when tires are not sliding sideways - the situation the OP was in. If a person can notice this, the VSC sensor can.

12-29-2006, 01:04 PM	#14
Devil's Advocate Senior Member Join Date: Mar 2005 Location: Las Vegas, Nevada Posts: 913 My Car: 2005 Prius Model: Package: #9 Thanks: 0 Thanked 1 Time in 1 Post Friends: 0	I trigger the VSC often, usually under heavy breaking when the front tires hit bumps in the road. The effect is that you temprorarily appear to lose braking as the VSC thinks that the bouncing tire (which at that point is locking up) is actually sliding. I am not very impressed with the VSC's response time, but it does do what it is supposed to, correct driving conditions so that the tires stay rolling and on the road. I can also get the VSC to trigger on dry freeway entry ramps when taken at speed. Its kind of cool to hear the beep beep beep all the way around the ramp. With a little finesse you can actually get a little drift going but not enough to bring the back end around or push the fron t end out from under you. The key is to know that the VSC one, is somewhat slow to react and two, is not the most intelligent as to your intentions with where you want the car to go.