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Discussion Starter · #1 ·
hey guys,

i need your help...

i have an 02 z06 with about 600 miles on it. i have broken it in pretty easy til about 400 miles. well after that i have gone thru the gears pretty hard and it has done the same thing quite a few times to me.

i will be almost always in second gear going to redline and at abuot 5900-6000 rpms it just dies on me like i hit the rev limiter or hit the breaks. i know for a fact that it is nmot overevving as i am watching the tach VERY closely. also when i try to repeat it it goes way past that to redline.

i also thought it could be active handling , traction control or both but io tried it in all 3 modes and it still does it. now it does not do it every time but it has happened about a dozen times now and it has me worried.

what could be wrong????? :(:(:(

regards
george
www.mgwltd.com
 

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Discussion Starter · #4 ·
no its just like when traction control kicks in. absolutley no power and a almost like i hit the brakes. i guess i never left my foot in it to see if it stayed like that i just shifted or got off of it really fast.

george
 

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Discussion Starter · #6 ·
i know for a fact that traction control lights did not come on because the active handling has come on before and i noticed it right away.

sorry for being dumb but can i scan for codes within the car???

george
 

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MG

SAME thing happened to mine.........ONE TIME............
I thought I maybe pulled the old 3rd to 2nd OVEREV shift...........
It is exactly as you stated, it's not the small BLIP, as when rev limit is hit, it's as though the BRAKES are stomped.......
Mine did it, and it killed the engine, nearly...............scary as heck........:(
 

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Well, it may be the rev limiter.

See, the tach is "low pass filtered" so that it is smooth. What that means is that under full throttle in 1st and 2nd gear, it really cant keep up. so you hit the rev limiter at an indicated 6000 rpm or so, but its really 6600. the car accelerates that fast.

What you really need to do to be 100% sure (and Im 85% sure that the above is your problem), is record an autotap run. I think you will see the RPMs when it happens are higher than the tach can keep up with. Bet it doesnt happen in 3rd or 4th.

Alex
 

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HI there,
I would say that it is torque management kicking in, because it would not show on the DIC, just throttle back the engine.
If you have no codes, I would say that the abuse management part of your calibration has kicked in.
Besttoyou, c4c5:z:
 

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c4c5specialist said:
HI there,
I would say that it is torque management kicking in, because it would not show on the DIC, just throttle back the engine.
If you have no codes, I would say that the abuse management part of your calibration has kicked in.
Besttoyou, c4c5:z:
This blows me away. I'm not doubting your knowledge on this subject...I'm just shocked at the answer. So, I guess if you slam the gas in 1st gear and the car is going sideways that the computer has the capability of "throttling back" the power? Even with ASC off?

I will be sorely disappointed if I can't put the car through its paces b/c the computer "thinks" I'm being abusive. Abusive is powershifting every gear. Trying to put your right foot through the floorboard is not.

Help me understand when the above scenario might occur. It doesn't sound like the original poster was abusing the car at all.
 

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c4c5.....ditto's to Wa 2FST's post

Mine is an '01, I am under the assumption the '01's DO not have this system......just the '02's............

True, or false.........because when mine did this ONCE, it never read any codes or showed any TC modes, etc..........pls explain......

This new management ABUSE system, sounds like something that DOES NOT belong on a HiPo Vette............

This is a dangerous feature if so.........

And IF it is as you described, what is the purpose for coming ON when just running to the redline??......defect?
Pls advise,:(
 

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I had this happen yesterday when trying to show a buddy with a modded F body how his car pulled compared with a Z. I needed to shift my WOT shift point a little earlier than the red line to avoid the lugging you describe. I have an '01 so it is not an abuse protection issue. It doesn't happen in 3rd or fourth so I assume it is rev related. I feel I have to learn where the vehicle has been set up electronically rather than consciously push it to that edge and wish it didn't happen. I would suggest you think about a chip mod that reforms the curves put in by the OEM.
 

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Torque management

Hithere,
From document 672602 in GM SI2000, under Powertrain control module, description and operation.:z:
Torque management is a function of the PCM that reduces engine power under certain conditions. Torque management is performed for the following reasons:
1 To prevent overstress of the powertrain components.
2 To reduce engine power during certain TAC system faults
3 To limit engine power when the brakes are applied more than approx 40%
4 To prevent damage to the vehicle during certain abusive maneuvers.
The following are instances when engine power reduction is likely to be experienced:
During transmission upshifts, and downshifts
Heavy acceleration from a standing start
Brakes are applied with a moderate to heavy throttle(with traction system active)
When driver is performing harsh or abusive maneuvers, such as shifting into gear at high throttle angles
The engine power output will be moderate at full throttle.:z:
I hope that this helps, c4c5
 

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c4c5

Thanks for the data........I appreciate you and all your efforts & help.

NOW, on to the show.................

IMHO, this system is :bs: from the standpoint that "IT"(great name for a takeover system)..........does something "IT" thinks is abusive when in reality it is not............

My "IT", event happened when I was UPSHIFTING.......the standard way,2-3rd, wasn't even at the rev limiter when I shifted, at was like I hit a brick wall, or slammed on the breaks............

This was during what I would call NORMAL 1-4 6000 rpm shifts, i.e. running through the gears IN a straight line from a standing start, no clutch dumping, no abusive manuever's, no nada.........

"IT" somehow just decided it was time to do whatever, and scared the bejesus out of me, and IF another vehicle had been behind me, it would have been a major smash up..........

Everyday, I find out that "Christine", has a new widjet, that I have ZERO control over....................

IMHO, these vehicles should have ONLY a rev limiter...........
It's OUR $$$$$ and we should be the judges of how they are driven........we tear em' up, and we get to pay for it........fair enough, but for a system to OVERIDE the drivers wishes, in an accelation mode is not a smart or good idea from my perspective.......(especially a NON abusive one).

Why do they think we BUY these automoboles anywy?........
Like I said before, if I wanted a governor, I would have bought a BIG truck.................

While this only happened ONCE to me, I think it happened under circumstances where it should NOT have come ON........that is the bottom line of my whole diatribe............

Otherwise, I love the car, and it has been a joy to drive.............NOW, I just can't imagine HOW these guy's are running 1/4 mile shots, and NOT have this happening to them on a very REGULAR basis...................:-?

Am I way off base here, or do the rest of you feel the same way???:roll:
 

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Re: Torque management

c4c5specialist said:
The following are instances when engine power reduction is likely to be experienced:
During transmission upshifts, and downshifts
Heavy acceleration from a standing start
Brakes are applied with a moderate to heavy throttle(with traction system active)
When driver is performing harsh or abusive maneuvers, such as shifting into gear at high throttle angles
The engine power output will be moderate at full throttle.:z:
I hope that this helps, c4c5
I guess we/I should take a poll and see how often this is "likely to be experienced". Sounds like a bunch of crap to me. I am buying the car to drive. I assume this isn't happening to very many people who drag race theirs at the track...and some of these guys have some pretty serious mods.

Honestly, if mine does this very much at all...I'll sell the thing in a heartbeat. I did not buy it to play "grandma" in the slow lane.

What a joke. GM should have engineered the parts to take the "abuse". Otherwise, don't mass-produce the hi-po engine if the drivetrain cannot take it. :p
 

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I wonder if the thread has started with a notice of a blown engine if GM would still be getting any heat from folks that they should offer better engineering protection on these hi perf. engines. If it is happening at normal shifts you have a problem. Get it fixed. If you are pushing the envelope as I like to do then learn to adjust to the edge (as I am trying to do) or again defeat their (GM's) upper limit safety margin by negating it and do it at your own risk. Then everyone will be happy, even when they blow their engine. We can't have it both ways........ the good news is you have third to stretch out w/o hitting the wall so lose 341 RMP on your second shift and go back to having fun. A small price for the long run (in my opinion) and it has not cost me any loss of face yet. Another advantage for these GREAT vettes.
 

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FELKEGB

Me thinks you have missed the point, he say's very respectfully...........;)

The point being..........WA's & Mine, is that this SHOULD NOT OCCUR below the rev limiter's setting..........

It did to me, it has to the starter of this thread, and all we want to know is WHY...........( where were your RPM's??).

The GM bulletin is BS.........

It is exactly as WA2 has stated.........it's is called CYA........and iin this case it's CGMCA..............:-?
 
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