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Old 11th November 2010, 20:56   #46
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Originally Posted by sapl View Post
Hi Sutripa - brief answers below:

1. The AFR was measured with the car loaded on the dyno, 5000+ rpm, WOT with a wideband AFR meter.
Wonder what the accuracy limits are? How does one recalibrate/ recertify an AFR meter?
....

4. I do not know what processor it uses. It is not a DIY system. Yes, the tuning tools are powerful, but they give it only to authorised dealers.
Documentation (for the DIY guy)?
Which would be a DIY friendly piggyback?

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Sutripta
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Old 11th November 2010, 21:34   #47
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Documentation (for the DIY guy)?
Which would be a DIY friendly piggyback?

Regards
Sutripta
1. My experience on piggybacks is limited to the Unichip.

I was earlier a skeptic of piggybacks, so I never looked seriously at piggybacks !

2. One regular check you can do is that when a car is running in closed loop, check the reading with the wideband. If it is 14.7 (since the narrow band works only at this figure and is extremely accurate), we have a quick check that the wideband it is ok.

Once in a while, cross check with other wideband meters. If there are differences, it is time to replace the probe.
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Old 11th November 2010, 22:02   #48
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1. My experience on piggybacks is limited to the Unichip.

I was earlier a skeptic of piggybacks, so I never looked seriously at piggybacks !
For ultimate performance, I'd agree. However, cardinal rule in modifying is "one change at a time". So a piggyback to gain knowledge, standalone to gain whatever it is that you are optimising!

2. One regular check you can do is that when a car is running in closed loop, check the reading with the wideband. If it is 14.7 (since the narrow band works only at this figure and is extremely accurate), we have a quick check that the wideband it is ok.

Once in a while, cross check with other wideband meters. If there are differences, it is time to replace the probe.
These are 'sanity checks'. Can anyone (NPL, ERTL etc.) actually certify?

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Old 11th November 2010, 22:21   #49
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These are 'sanity checks'. Can anyone (NPL, ERTL etc.) actually certify?

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Sutripta
I am not aware of any traceable standards for O2 sensors. However, as a long as a sample of air with controlled ratio of oxygen, it should be easy to calibrate. Sensor manufacturer do describe a calibration procedure based on free air.
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Old 12th November 2010, 09:44   #50
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@Sutripta: Piggybacks like AEM's F/IC are geared towards DIYers. Not too excited about the method of ignition control myself (run a standalone/remap myself), but it should do fine for most people.
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Old 12th November 2010, 20:36   #51
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Originally Posted by sapl View Post
I am not aware of any traceable standards for O2 sensors. However, as a long as a sample of air with controlled ratio of oxygen, it should be easy to calibrate. Sensor manufacturer do describe a calibration procedure based on free air.
AFAIK, O2 sensor readings are highly nonlinear. Single point calibration will not be sufficient.

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@Sutripta: Piggybacks like AEM's F/IC are geared towards DIYers. Not too excited about the method of ignition control myself (run a standalone/remap myself), but it should do fine for most people.
Would you have a softcopy of its documentation which you don't mind sharing.

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Old 13th November 2010, 00:47   #52
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Originally Posted by Sutripta View Post
Would you have a softcopy of its documentation which you don't mind sharing.

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Sutripta
AEM F/IC Piggyback

Everything available there including the software, docs, instruction videos and FAQs.
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Old 13th November 2010, 22:52   #53
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^^^^
Thanks. Didn't find what I wanted. Will search some more.

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Sutripta
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Old 13th November 2010, 22:54   #54
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What exactly do you need?
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Old 13th November 2010, 23:14   #55
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^^^
The ECU as an embedded system. Schematic, sample commented source code. If ASICs/ CPLDs used, their functional description. Supposing you were taking a class on ECUs. What you would need/ use in your practical class.

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Old 14th November 2010, 00:09   #56
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Ah, nothing available then. Your only option with that much detail would be a Megasquirt. I don't know much about other ECUs but OBD1 Honda ECUs have been analysed and documented at pgmfi.org over the years. They've lost a lot of info so you'll find it through archive.org when looking through pages from 2005-2007. It's a dying breed at the end of the day so the only purpose is if you want to work with the old Hondas or learn about ECUs themselves. No point going through that info if you're looking to use it on a newer Honda.
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Old 14th November 2010, 20:01   #57
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^^^
Yes, when it comes to openness (of information, not architecture) Megasquirt it is. However, not really designed as a piggyback. And with some limitations.

Thanks for your replies.

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