Quote:
Originally Posted by Malek@MRF
The primary catalysts are the ones first in the system. They do the bulk of the work and are the most restrictive. They are 400 cell units as opposed to 200 cell for the secondary units.
I am not sure why Dinan worded their statement the way they did because it is very misleading. The secondary units are NOT the main power killers in the system and that part is not clearly laid out by Dinan. However it clearly states that the system removes the catalysts that will not throw an emissions error. Diagnostically, this would only be possible by remove the catalysts after B1S2 (Bank 1 Sensor 2) and B2S2 (Bank 2 Sensor 2) since their is no monitoring being completed on those units. From an emissions standpoint, all cars have their secondary catalysts after B1S2 and B2S2.
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This was not dinan this was BMW in-house training manual on the e9x m3. So unless bmw itself got it wrong I guess everyone else knows better. Has anyone flow tested the cats?