DIY-WB logging delay and dynos??

[Shannen Durphey]

How would you calibrate a delay?  It varies from car to car.  There's different
levels of signal conditioning and different methods of making the signal
readable.  There's even different configurations for getting the exhust sample.

There is a fair delay in some circumstances.  A careful dyno operator will not
simply crank on the tune after one pass on the dyno, but will watch what's
happening in several areas.  Load based dyno tuning is better (Easier?  More
accurate?) than simple inertial dyno tuning, and tends to reduce or change the
"delay compensation" needed.  It's kinda like trying between stoplights vs
trying to tune on the interstate.  

Like anything, the dyno is a tool and a good operator (and the tuner, they are
not always the same) needs to understand what it does and does not do.  

Shannen


Clute, Mark wrote:
> 
> Do the shops running chassis dynos which have a tailpipe sniffer placement
> have any delay calculations in the software so they get accurate A/F vs. RPM
> measurements or is placement in the headers vs. tailpipe and sensor delay
> not considered a big enough difference at that point??
> 
> Thanks,
> Mark
> 87GN
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