I was told this about my AMK 210 LCR a couple of weeks ago 8-Bit. I ran it on the rollers at Monster Performance in Whitburn (Evo specialist)
I have been to a RR before where a lot of the
SEAT Ibiza Cupras (mine included that day) was told that they were running a bit lean. I don't know if this has to do with the way the lambda probe sits up the exhaust, it seems to read ok for other cars though?
Thanks for the response mate, struggling to get anywhere with this and I'm concerned in case my car is running too lean! I had some logs done at the weekend, both with my MAF and with Willie's as his is known to work. Read last night that you can multiply the Lambda readings from block 31 on VAGCOM logs by 14.7 to give the AFR so I did that for both Lambda figures (not sure which one is relevant or both) for the logs with each MAF and came up with these figures and graphs:
I presume that one Lambda figure (and resulting AFR calculation) is requested and the other is actual, like boost figures but I'm not sure. In any case, from the VAGCOM logs on both of these it doesn't look like either is richening up much, the one on Willie's MAF does slightly on one of the Lambda to AFR calculations but not to anything like 12, like was suggested in the OP's post.
There was another LCR at the same RR day, he was on the rollers immediately before me. We think his car is remapped (or he was told it is) and his richened up to about 12.5 which the operator said was ok, so I'm half wondering if the richening up thing is more relevant to remapped cars. Below is the AFR graph that was taken from my car using the exhaust probe on the day:
So I'm not sure where I go from here. Don't think the MAF is at fault, mine only gives slightly worse figures than Willie's and he says his is fairly new (no idea how old mine is, it was on the car when I got it). I'm told that these things should richen up when the engine is under high revs as a way of keeping cylinder temps down so am a bit worried I could be damaging stuff if I drive it hard...