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Having troubles with enrichment? Hey try this out, it may or may not work for you...
I was browsing through my Bosch fuel injection book and stumbled upon a section that talked about the different styles of warm up regulators. Some of the regulators have an atmospheric compensation port; this port can be used to convert your CIS/lambda or Basic warm up to act as a load sensitive enrichment device. So I popped the little black cap off the port and ran a vacuum hose from the port to intake manifold vacuum. This jacks control pressure up to 70 PSI at idle, when under WOT it drops to 50 PSI. Re-calibrate the fuel mixture so it runs at 50% dwell with the 70 PSI control pressure. The next time the vacuum drops it will drive the warm up to reduce control pressure in synchronization with the engine load! While I was driving I was monitoring the O2 and at WOT it responded with a perfect slightly rich .70V-.75V under a heavy load.
I’m ditching the throttle-activated enrichment; it sucks compared to this!
I was browsing through my Bosch fuel injection book and stumbled upon a section that talked about the different styles of warm up regulators. Some of the regulators have an atmospheric compensation port; this port can be used to convert your CIS/lambda or Basic warm up to act as a load sensitive enrichment device. So I popped the little black cap off the port and ran a vacuum hose from the port to intake manifold vacuum. This jacks control pressure up to 70 PSI at idle, when under WOT it drops to 50 PSI. Re-calibrate the fuel mixture so it runs at 50% dwell with the 70 PSI control pressure. The next time the vacuum drops it will drive the warm up to reduce control pressure in synchronization with the engine load! While I was driving I was monitoring the O2 and at WOT it responded with a perfect slightly rich .70V-.75V under a heavy load.
I’m ditching the throttle-activated enrichment; it sucks compared to this!