AFR goes lean on overrun?

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25-01-2009, 11:37 AM

jacko996

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AFR goes lean on overrun?

When backing off the gas AFR goes very lean for split second, Is this normal??

Cheers
Dave

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25-01-2009, 11:43 AM

JTECH James

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on what?

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25-01-2009, 11:52 AM

jacko996

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sorry on yb running 500 bhp

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25-01-2009, 11:57 AM

JTECH James

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it depends how its been mapped tbh, best off asking your tuner.

if its L8 or P8, iirc they have a fuel cut on over run to prevent cat damage, but again it depends on the map

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25-01-2009, 12:08 PM

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Perfectly normal fuel saving strategy

And dont listen to those who say you need rich fuel too cool cylinders as thats crap. !

Most overrun overfuelling is bad mapping and the above excuse is used to get over the fact they havent set it up properly...LOL