Berk Test Pipe install...*^$#ing factory bolts!!!

mjohn617

Your not tuning exhaust pulses, just relieving back pressure, I don't' want to get into detail...wrong thread. I haven't heard anything about single walled pipes or weights on stock exhaust, that is kind of interesting.

As far as your CEL goes, you can get codes at any time....any time! Personally I wouldn't ever use steel wool, just seems like poor mechanics. Not that it is going to cause damage, but your just asking for problems down the road.

http://www.bigdaddiesgarage.com/mini-cat-cel-fix.html <this is one of many sites, look around you will find many more

Get some high quality fittings and do it right the first time, you shouldn't have any problems with a high quality fitting for your O2 sensor. If that doesn't work the steel wool might....but your only buying yourself time and I guarantee that it will fail at the worst opportune time.

Jordo!

The CEL is tripped if the ECU detects the same rate of voltage change between the two O2 sensors in either bank -- that is interpreted as an indication that the cat has failed.

All the defouler (or one with steel wool packed inside) does is allow for more distance/block gas flow so that that the rate of change is different. How different they need to be depends on the ECU logic.

Mine has an extra long, U bend defouler, so it should be fine, but if not another defouler to further extend it or the wool to slow things down should work fine.

Feel free to start another thread under tuning or shoot me a PM to explain -- I still don't see how playing with TPS will affect back pressure one way or the other (although taking out the restriction of the cat does that mechanically).

I guess you might be referring to actually commanding more or less throttle opening via VVEL or throttle blade actuator rather than simply having the ECU read from different load cells in it's fueling map. Is that what you mean? You can do that with your foot too...

Anyway, I don't see how that would work because if the resonance is RPM dependent, which is what I think, you still have to cross over that RPM, even if you physically open the throttle more.

It must be a specific resonance issue -- that would explain why some shops offer resonated test pipes to cancel out some of the vibrations. You can't tune that -- or at least I don't understand how -- with an ECU

I'm not trying to be an *** here -- expertise is relative, so if someone knows something I don't, I'd rather understand it than automatically agree or dismiss it.

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