Re: Removing EGR System on '76 530i?

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: : : The engine will run much better if you remove the EGR stuff. If that car has thermal reactors, rip them off too and put on a set of Bavaria manifolds. (The down pipes will need to be made a little longer.) : : : If your conscience is bothering you over this, you can get an aftermarket catalytic converter and put it on there for under $200. That'll do more good than anything that's on there now. (I would.) : : Be careful. You'll need lambda to keep excess O2 levels correct to keep : : cat operating correctly : : My euro had ca with no lambda (hack importer) and : : it overloaded all the time : : Peter : : Talk to Scott Stewart : Thats me. The object here is to assemble a FI system that : is properly tuned, provides good driveability, low fuel : consumption, and has minimal emmissions. : I had my 530i checked for emmissions after I retrofitted my : L-jet with Lambda control FI system from a 528i. It's emmissions : are lower without a catalytic converter than what the original : specs call for on a 1977 530i. The L-jet with lambda control FI : system is leap years ahead of the one on your car now because : it actually monitors the fuel/air (stoichometric) ratio rather : than assuming it is OK. My performance is up, driveability is much : better (my car would flood at high rpms when it was cold before I : changed to the new system)better fuel consumption, and of course the : lower emmissions. : Following is a quick list of the components I assembled for the conversion. : Any questions, additions, or comments are welcome from those that currently : drive "the real thing" 528i or from others who have done this conversion (Marty : Roach). : All parts were removed from a running 1981 528i: : ---122 extension ECU, same connection as the 106 original model in the 530i. Make sure : you plug in the single spade terminal at the ECU that is not part of the FI wiring harness. : I think this plug is the distributor pickup or Pin #1 on the ECU (help here from those in : the know). : ---Complete FI and engine wiring harness from the 528i : ---528i valve cover : ---528i throttle body with 4 contact limit switches : ---528i AFM : ---auxiliary air valve and AC bypass valve off of 528i : ---exhaust manifold downpipe with threaded port for 02 sensor : ---528i combo relay : ---later style vacume advance/retard distributor with : transistorized ignition, ignition module, resistor bank etc. : Mount it on inside of unibody behind the windshield washer : bottle with heatsink grease (resistor bank gets pretty hot). : Don't forget the engine wiring harness coming from the ignition : module to the distributor, ignition coil, temperature sending unit, : alternator (power and spade terminal for idiot light), and oil pressure : sending unit. This harness will have a plug that plugs right into : your fuse box. : ---528i thermostat housing with fittings for vacume retard during cold : running, temp time switch, temp sending unit for gauge and FI (this makes : the FI wiring harness much easier to fit) : ---528i plenum chamber : ---528i fuel rail, fuel pressure regulator, injectors. : I am sure you are saying WHAT!! by now but believe me it is worth the hassle. : I don't know if the exhaust manifold from a 528i is necessary, my car had : headers on it so I never saw the original 530i exhaust manifold. : OK. Thanks to Peter Florance I just happen to know the only mods that are : necessary to the wiring in your car once the FI and engine wiring harness are : in place are: : Remove the purple/green and yellow/green wires from the Fuel pump side plug : in your combo relay (easily done with a knife that will flatten the tab that : holds the terminal in the plug). Remove these same two wires from the Fuel pump : side plug of the combo relay that came on the new 528i wiring harness and replace : these wires with the two out of your harness. Tie wrap everything down and tape : up the old combo relay plug with electrical tape (the main power, red, wire still : has power to it)and start the car. : I hope some of this helps you or anyone else brave enough to perform the upgrade. : Scott Stewart

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