matt_gsxr
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| posted on 13/4/10 at 09:44 PM |
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The sampling of the MAP is a bit complicated as it is confounded by the sampling rate of the datalogs (which is much lower than that of the
calculations).
The actual output will be based on all the MAP samples it sees, which (on average) will be a smoothed MAP curve (but with noise). I don't think
that this could give you the bias in the AFR that you have seen under different acceleration conditions.
Sorting the MAP to give a nice smooth function can only help.
Have you considered monitoring the pressure in the plenum. There is an option for a second pressure sensor in the MS. I think that could be a useful
hidden variable.
Matt
[Edited on 13/4/10 by matt_gsxr]
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flak monkey
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| posted on 14/4/10 at 07:15 AM |
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OK, I will look at finding a small filter of some description and see if it helps with the smoothing as well. Like you say it can only be a good thing
anyway.
Compared to the current release code, the map in the alpha code is probably 50% smoother with the new algorithm. I dont have any comparison datalogs
handy though.
I could probably measure the air pressure in the plenum too yes, I'll look into it.
Thanks,
David
Sera
http://www.motosera.com
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flak monkey
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| posted on 14/4/10 at 10:01 AM |
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Just spoken to Omex, and they run blended TPS and MAP when they see problems like this and they have on supercharged duratec and zetecs running
individual throttle bodies. So it is the way to go by the looks of it....
I still may change to omex this winter depending on how the squirt goes this summer....
Sera
http://www.motosera.com
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atspeed racing
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| posted on 14/4/10 at 01:09 PM |
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you'll now probably kick yourself to know we have recently finished a group buy on omex600 ecus, which were 499.99 inc vat and included 1 hour
free mapping.
perhaps once our trader status and site advertising gets sorted out we could arrange another one on here if theres enough interest?
- colin.
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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flak monkey
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| posted on 15/4/10 at 01:58 PM |
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Dammit, never mind though.
Am going to persevere with the MS for a little while yet, and then think about changing this winter if I need to.
I have just ordered a smaller supercharger pulley which should arrive tomorrow which should take me up to around 12psi of boost. Then I just need to
sort out my tensioner to stop that slipping, change the oil and we are away for a full on mapping session.
David
Sera
http://www.motosera.com
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