Quote:
Originally Posted by Blue Angel
I see... I was under the assumption that a 1990 gas VW would already have an EGR circuit! 
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! |
In a newer vehicle the computer should be able to see changes with the O2 sensors. In theory the ECU should be able to achieve stoich with less fuel...
Not really sure how the 90 VW would do... I have zero experience with mechanical fuel injection systems
