rev limiter or wheel spin?

Rev limiter cuts in above 8,700rpm and it feels as if the engine is intermittently missing. When the ASR cuts in you just lose a lot of power. At 6,500rpm I think you hit the ASR. Sometimes ASR cuts in even before you feel the loss of traction.

 

Yup. And if not careful your whole car will spin too.

 

In a mid engined, most definately.
Then again, a bit of a tail wag is what makes driving 400hp a lot of fun.

 

ASR will appear on the dash inside the rev counter , very hard to miss

 

Same thing here....ASR

I was making a fast approach at a parking lot (where some buddies where waiting for me to pull up).....when I pulled into the parking lot and turned hard right...(I was still in the radius of the turn) and I came on the power but instead of accelerating, the car just buggied-along till I was completely straight and then gave me some umph!

I am familar with this. It's the nature of traction control systems. Let me elaborate:

I have a Hummer H2, it too has a traction control system: if it senses a wheel is spinning more then the other wheel....it figures that wheel has lost traction and then uses the brakes to hinder that wheel from turning. It does this for a simple reason: an open-differential will allow all the power to go to that one wheel that is spinning, the path of least resistance. You can see this on almost any conventional 2 wheel-drive vehicle, just jack the rear-end (provided it rear-wheel drive) up in the air and try to drive away: the tire in the air will just spin, the one on the ground does nothing.

When it comes to offroading there are several ways to deal with this: limited-slip diff's, posi-traction and my personal favorite: the electronic locker which locks the rear-end solid....BUT you lose a degree of control when the axle is locked, especially in the front end where the steering is.

Anyways...the traction control in this case uses the brakes to stop the spinning wheel and divert power to the wheel that has traction. It works, but you have to keep the throttle steady so the detection is maximized.

SO...getting back to our F-cars...I don't think they use braking to stop wheel spin...but they do use a dramatic reduction of power to stop the spinning. Unlike the offroaders, the wheel spin in performance cars is brought about by an excess of power and loss of traction accordingly.

And so....finally getting to it: when you are in a turn, the outside wheels are turning more then the inside wheels, this due to the differing arcs of each radius the tires follow (inside vs. outside wheels). You and I know this is happening due to the turning, BUT the computer doesn't know we are turning and it detects what it senses to be wheel spin (the outside wheels turning more then the inside)...and so it drops the power believing it'll stop the spinning and save our butts.

Ray....did you experience this power-drop while you were perhaps turning? The ASR on the 360 strikes me as a tad bit too sensitive. I've hit the ASR several times and I'm quite certain it's not honestly traction related but instead sharp-turning induced.

 

Steve,

That's probably a good observation, because the 360 would appear to behave somewhat differently that other cars with ASR.

 

Does anybody know how to permanently (i.e. unplug) the ASR?

 

I think you should flip the switch that is for ASR off.
When you stop the engine it will turn on again so just re flip the switch.

Russell

 

are you waiting to make sure that the engine is up to temperature before you stand on the gas? You aren't supposed to go above 4500 rpms (pretty sure thats what it is, would need to check) and I believe you aren't supposed to use 2nd gear until the engine has warmed up. I'm not sure whether or not that may be causing the issue, but it will definitely help prevent any premature wear and tear on the engine.

 

It's probably the traction control.
It happens to me when I get on it a bit.
If I am going to drive fast I use sport mode as it still has traction control but its set to not be so intrusive.
I must say the first time the engine de powers when going hard thru a turn is a bit of a strange feeling.

Russell

 

I always turn off the ASR when driving in a spirited manner. I don't want the car to start correcting itself while I'm trying to control it with throttle and steering. That's all I need is to have someone else (ASR) playing with my throttle while I'm playing on the edge.

G

 

It can be a pain in the butt.....but it can also save your butt, just choose which butt you'd rather be.

I'm willing to admit, when I first got my 360 I was jamming up through some twisty super-tight turns going upwards through a near switch-back.....I was going through the turn, my capristo stage-3 was blaring so loud I couldn't even hear the tires squeling....I apparently got on the power too hard and my back-end started to go out: BUT the ASR caught it and I kept my line. It saved me.

All my 360 buddies assure me I just need to get used to the quicker power-response as compared to my 355. I also think I need to get my throttle re-mapped or something, but still...the ASR is an overall good thing until you begin to approach being an excellent driver, are very familar with the car and don't have young children at home expecting their Dadda to come safely.

Just a thought....

 

Are your tires warmed up? When you first start the car and let it idle for a bit to get to normal running temp your tires are still cold.

Also any upgrades like exhaust/test pipes? On my car with test pipes I need to reset the ecu every so often because the engine bogs down because the air/fuel mixture gets out of wack.