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What is lambda value for stock fpv GT335 tune?


Fgxxr8

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You can check this by opening up the stock tune file or reading it from the vehicle. Lambda stoich is usually 14.63 from the factory which they will command at idle and cruise. This is a typical base fuel map for an XR8. Remember there are lambda modifiers as well. Eg exhaust/cat overtemp (0.7 lambda) and enleanment for torque reduction (1.05 lambda).

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Basically, the 500 load cell is your WOT fuel, like Roland said, once it hits around 590AD counts, the computer thinks your at WOT. So .87 lambda would be around 12.7AFR then it dips down 11.8AFR @ 5k RPM, then 11.0AFR at the top end. Please someone correct me if this isn't the right information.

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25 minutes ago, trav1s said:

Basically, the 500 load cell is your WOT fuel, like Roland said, once it hits around 590AD counts, the computer thinks your at WOT. So .87 lambda would be around 12.7AFR then it dips down 11.8AFR @ 5k RPM, then 11.0AFR at the top end. Please someone correct me if this isn't the right information.

Yep this is basically it. The WOT setpoint is defined by another scalar however as this map only goes to 500 the PCM will peg the values at this bottom row from 45% onwards.

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