Bens2rs

Been told if you want to live map your car to get a safe reading of afr you need to put a lambda sensor on the downpipe, is this true or can you use lambda in tailpipe?would the readings be any different??

pa_sjo

It's better in the downpipe.. There's very little room for error then.

Karlos G

iTrader: (4)

Agreed better in the downpipe, but when your car is setup on the RR they use a WB lambda that goes up your exhaust so either will be fine as long as its good quality!

Christian and Beccy

iTrader: (14)

Reading AFR from the tailpipe only really causes a problem a low speed because air may get into the exhaust and 'influence' the reading.

Also, any leaks in the exhaust will affect the reading too.

Theoretically, if the exhaust is 100% leak-free, then the difference between measuring from the tailpipe or downpipe is very marginal.