Quote:
Originally Posted by E92M3Guy
That's nice, but I hope you realize that you're at the mercy of the wide band O2 sensor on the dyno when you do this. We have a local dynojet whose wide band always flat-lines in the 10's, even when the car's wide band is reading in the 13's. Just goes to show that you must always check and verify the wide band on the dyno as well.
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Oh, it can get even worse. If it is the vacuum pump wide band Dynojet offered for years, even if the sensor is remotely accurate, you are seeing A/F information that may have occurred 1000rpm earlier. Effectively rendering any A/F information unreliable. The only proper way to monitor A/F is to mount the sensor directly in the exhaust stream and bypass the horrible pump.