poor man's A/F ratio adjustment?

[onZedge]

Just a thought. If the DME temperature sensor controls mixture at different temperatures, would replacing it with a dash mounted potentiometer give you a simple A/F ratio adjuster? I'm thinking: disconnect the signal from the lambda sensor to the DME leaving the lambda heater circuit intact, and connect it to a dash mounted stoichiometric ratio meter of some sort. Any thoughts?

[Britwrench]

Anything is possible, trying to understand what the potential advantage there is? We are talking about a basic Motronic system here, with mapped fuel/air ratio adjustment. The switch would probably look very nice on the dash, but for the real world and street driving (and track use too) any performance increase would likely be none. Get a FRWilk chip.

[Porsche944]

BAD idea.

That temperature sensor is there to help the DME maintain a proper fuel/air mixture as well as trigger "cold start enrichment" based on engine operating temperature. If you screw up and go too lean the engine will knock (ping, detonate) and then you start breaking stuff. Go too rich and you waste fuel, shorten the life of the O2 sensor, and can eventually clog the Cat.

"Going manual" will also make it very difficult if not impossible to pass emissions tesing.