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Dyno tuning; tail pipe or LC-1 best?

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Old Aug 19, 2008, 08:03 AM
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Dyno tuning; tail pipe or LC-1 best?
I've noticed that a lot of tuners use the tail pipe for measuring AFRs when tuning on a dyno. If a car has a wideband would it be better to measure the AFRs from the wideband or use the calibrated tail pipe sniffer?
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Old Aug 19, 2008, 08:04 AM
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If both are calibrated, there shouldn't be any difference.

My LC-1 was spot on compared to the sniffer the last time I was at AMS.
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Old Aug 19, 2008, 09:35 AM
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Originally Posted by derekste
If both are calibrated, there shouldn't be any difference.

My LC-1 was spot on compared to the sniffer the last time I was at AMS.
Thanks for the response. I know there is only a few feet difference between the LC-1 sensor and the tail pipe sniffer but I was concerned that the tail pipe sniffer might not get as an accurate reading.
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Old Aug 19, 2008, 09:49 AM
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If you have any leaky gaskets between the lc-1 and the sniffer, the sniffer will read more lean (due to fresh air being venturied into the exhaust pipe)
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Old Aug 19, 2008, 11:13 AM
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Originally Posted by silver_evo
If you have any leaky gaskets between the lc-1 and the sniffer, the sniffer will read more lean (due to fresh air being venturied into the exhaust pipe)
Wouldn't the catalytic converter screw up the tailpipe reading? I mean most wideband manuals specify the sensor to be placed before the cat.
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Old Aug 19, 2008, 01:43 PM
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^ That's IF there is a cat.

I would say the LC-1 would be the best to read off of. Especially if you do any logging when NOT on the dyno since that's the only reading you'll be getting to work with.
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Old Aug 19, 2008, 03:19 PM
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I do have a high flow cat and my LC-1 is obviously before that.

Thanks for the input guys.
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