Quote:
Originally Posted by razor02097
Yes I believe you are correct. One of the reasons we with older cars seek to improve our ancient EGR systems.... or in the case of the OP... to ADD an EGR system  . |
I see... I was under the assumption that a 1990 gas VW would already have an EGR circuit!
Quote:
Originally Posted by razor02097
In today's vehicles the computers are much smarter about using the EGR system and much of the time it will improve FE as a secondary benefit.
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Yes... also, many of today's cars are not using a dedicated EGR circuit: they are able to use variable cam timing overlap to keep a certain amount of exhaust gas in the chamber. This cuts the cost/complexity of the EGR system completely.
I wonder how the OP's idea would apply on a modern car with a mass air sensor and variable cam timing? I would think the exhaust gasses would need to be introduced post-MAF so the computer was unaware, but then the manifold vacuum/airflow ratio might not make sense to the ECU?
Lots of questions I have... looking forward to this thread!