Dyno questions and associated ramblings

jpit · 12-16-2009, 09:46 AM

Modshack,

I have a dashdyno that reads A/F ratio from three different sensors. The instructions do say that the car must have a wideband sensor (as opposed to narrow) to get a reading. Two of the sensor readings are very similar while the third seems to read very high (very lean). If our cars have a wideband sensor built in why can't they used that instead of installing a sniffer in the exhaust pipe?

Modshack · 12-16-2009, 11:04 AM

Quote:

Originally Posted by jpit

Modshack,

If our cars have a wideband sensor built in why can't they used that instead of installing a sniffer in the exhaust pipe?

Typical Dyno guys are not electronic technicians. Only more recent cars have widebands built in... the difference between a tailpipe sniffer and an on board sensor is not enough to be an issue......Especially when you're only paying a few bucks for a dyno pull.. As I mentioned, guys that do serious tuning using a Dyno compensate for these small differences, knowing that they are there..

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12-16-2009, 09:46 AM	#1 (permalink)
jpit Enthusiast Member Join Date: Feb 2009 Location: Washington State Posts: 440 Drives: 370Z Tour MT w/Spt Rep Power: 17	Modshack, I have a dashdyno that reads A/F ratio from three different sensors. The instructions do say that the car must have a wideband sensor (as opposed to narrow) to get a reading. Two of the sensor readings are very similar while the third seems to read very high (very lean). If our cars have a wideband sensor built in why can't they used that instead of installing a sniffer in the exhaust pipe?