jmc12

What exactly happens when traction control kicks in ????

Bracati

it limits the fun factor

jmc12

Yea I got that, but does it shut a couple of cylinders down, are retard the timing.. I understand the rev limiter shuts down cylinders and when the traction control comes on it does not sound the same...
I have only been on the rev limiter maybe two times, so I know how that sounds.....

Bracati

I'm thinking timing the way it feels and sounds.

Bill Dearborn

Traction control works two different ways. At lower speeds it applies the brakes on one or both wheels while at higher speeds it limits power as that provides a quicker response. One way to sense what it does is swap your front and rear tires and then coast down a hill in nuetral. TC will apply the rear brakes in an attempt to control what appears to it as rear wheel spinning. TC is a function of the ABS brake system not the PCM. When it limits power the ABS controller sends a message to the PCM requesting torque reduction.

Bill

63Corvette

Here's one take: If you attempt to powershift 2nd gear with traction control ON, as you release the clutch with the throttle floored there is NOTHING....like you turned the engine off. Then after you release the throttle and push it down again, the engine will respond normally.

BlackZ06

From the Service Manual .......

Traction Control System (NW9)

When drive wheel slip is noted when the brake is not applied, the EBCM will enter traction control mode.

First the EBCM requests the PCM to reduce the amount of torque to the drive wheels via the requested torque signal circuit. The PCM reduces torque to the drive wheels by retarding spark timing and turning off fuel injectors. The PCM reports the amount of torque delivered to the drive wheels via the delivered torque signal circuit.

If the engine torque reduction does not eliminate drive wheel slip the EBCM will actively apply the drive wheel brakes. During traction control braking, hydraulic pressure in each drive wheel circuit is controlled to prevent each drive wheel from slipping. The master cylinder isolation valve closes in order to isolate the master cylinder from the rest of the hydraulic system. The prime valve then opens in order to allow the pump to accumulate brake fluid in order to build hydraulic pressure for braking. The drive wheel inlet and outlet solenoid valves then open and close in order to perform the following functions
* Pressure hold
* Pressure increase
* Pressure decrease

=====================================

so sayeth the manual ......

SJSZ06

Very interesting... mine felt like it closed the throttle a bit (electric throttle you know...) just before I let up. Weird feeling for us oldies.

jmc12

Thanks blackz06 for the research.. Have had the Z since May of last year and just getting to the point that I will push the car a little.. I don't drive it much only about 2000 miles so far.. Getting brave enough so I did a hard kick down in first and hammerd second and it was like it shut off.. Going to try competitive mode and feed the thottle a bit at a time till I get the feel for this BAD BOY... Like SJSZ06 said weird feeling for us oldies... Been around fast cars a long time but this thing is bad as they come for a old guy like me... I have a 67 goat and a 68 roadrunner and they can't get close to the Z...

BlackZ06

It does take getting used to ..... what amazes me is how quickly TC jumps onto a severe wheelspin .... try it on a wet day .....

Well, I'll tell you what, since the 67 goat can't come close to your Z06, I'll take it off your hands ..... very reasonable offer .... I'll pay the shipping costs, and even throw in a few hundred in cash for you .... you don't want an old car like that cluttering your garage ..... you're just lucky I'm such a nice guy (and have always thought the 67 will ALWAYS be the best looking goat Pontiac ever produced .... freakin AWESOME car .... )

Also, for both SJSZ06 and jmc12 .... consider getting your car to a road course track ..... something like Sebring in Florida, or Roebling Road or Road Atlanta in Georgia. There are a number of clubs that rent time and hold High Performance Driving Events (HPDE). Most chapters of the BMW club, for example, will let non-BMW vehicles attend when they can't fill all their openings. The events are a blast, and if you think the Z06 is amazing on public roads, wait until you discover how it handles a race track .... amazing.

jmc12

Blackz06 since you like 67 goats have a look at this one..
Hold on I don't know what the h*** I am doing...



OK got it figured out... I might do the track thing sometime, have a way to go on feeling comfortable wth the Z... Maybe an autocross... I go to Sebring every year it's only 90 miles from me...
I have too much STUFF so I keep a space at a storage place and take STUFF back and forth, thats why the goat's not at home this day...

BlackZ06

jmc12 .....



That is ABSOLUTELY BEAUTIFUL ....

Thank you for the pics

Over-torque

very nice...i restored a 65 once. almost the same color.