[Diy_efi] tuning question

[Michael Richards]

I would say that the sagem graph is conservative. They want it running 
extra rich in cold weather and to run a little richer when the intake 
temps are unrealistically hot. I think th motec and hydra lines are 
similar enough that there won't be a measurable difference. Off the top 
of my head the hydra is probably more techically accurate.

-Michael

> Interesting that you mention IAT.
> 
> I just finished a little excel graph comparing my
> bikes factory setting for fuel correction for air temp
> against a standard Motec curve and the Hydra EMS curve
> (http://www.mrcontrols.com/installs/nemesis/tuning.htm)
> 
> You can view the graph here:
> 
> http://superxtune.com/AirTempCorrGraph.jpg
> 
> My bikes curve(sagem) seems to be pretty whacked.
> 
> Anybody ever seen anything like this?
> 
> Thanks,
> Tim
> 
> 
> --- Michael Richards <michael at fastmail.ca> wrote:
>> Some of your results will depend upon the accuracy
>> of your WBO2. On my
>> Techedge I typically see within 0.1-0.2 points of
>> repeatability given a
>> specific load site and provided that all the
>> corrections are working
>> properly. If you don't have an accurate IAT signal
>> or CLT for example
>> it could account for the variation you see. Also be
>> aware that ignition
>> advance will have an effect on the measured AFR.
>> 
>> -Michael
>> 
>>> Is +/- 5% variation within the realm of acceptable
>> for
>>> a engine of this type?
>>> 
>>> I have heard that the wideband O2(NTK) reading can
>> be
>>> made more accurrate by correcting for EGT. Does
>> anyone
>>> have an idea of what AFR correction I might apply
>>> based on EGT?
>>> 
>>> 
>>> Thanks,
>>> Tim
>>> 
>>> 
>>> 		
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