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Alan L Alan L is offline
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Join Date: Apr 2006
Location: New Zealand
Posts: 3,261
It is, in my humble opinion, critical - for best performance, and to prevent melt down with a turbo engine. If you are going to tune the engine for optimum performance using either AFR or CO results, you only get an AVERAGE reading for the 6 cylinders. So a rich cylinder is compensated for by a lean one. But it is the lean one that melts under extreme load (and hesitates etc). So, if you are going to rely on CO or AFR numbers, you need to know that ALL cylinders are the same. Would be preset at factory - but over time injectors deteriorate or get swapped out etc.
You can't tune your car properly unless all the same. Porsche manuals generally mention 10-15% tolerance/variance between worst/best. But if you want the best from the beast you will fiddle till much better (<5%) than that.
Old 04-09-2008, 05:54 PM
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