What to datalog?

[C. Brooks]

I would recommend adding throttle position, fuel pressure, RPM and spark
advance. Those four would do a LOT toward helping you correlate your EGT
readings. Nice to have's would include oil temp (Pre/post turbo?), oil
pressure, wideband 02 might be nice for an additional correlation for the
EGT readings. Maybe add driveshaft RPM to use with engine RPM to calculate
tranny/clutch slippage.

How big are your thermocouples? Will the manufacturer give you the response
curve? I believe they are rated in microvolts/millisecond for response time.
That would let you know your fastest effective sample rate.

Charles Brooks
Mid-Atlantic Speed Shop
http://www.massmotorsports.com

----- Original Message -----
From: Jörgen Karlsson <jurg at pp.sbbs.se>
To: <diy_efi at diy-efi.org>
Sent: Friday, July 07, 2000 10:04 PM
Subject: What to datalog?


> I finally started building a display unit for up to eight thermocouples
and
> have planned on logging a few other values too. But when I am almost
> finished with the layouts for a Atmel 90S8535 and a linear devices LTC
1294
> 12bit ADC I started counting.
>
> On my car the only analog values I _need_ to logg are five exhaust gas
> temperatures, intake temperature, temp between turbo and intercooler and
> boost pessure. What do I do with the other eight channels?
>
> Any suggestions?
>
> I think it is best to ask for your opinion before I start logging useless
> things;)
>
> I have been thinking of these(in order of interest):
>
> WBO2, fuel pressure, crank house pressure, oil temp, oil pressure, coolant
> temp.
>
> I have decided that I need the extra two bits of the external ad converter
> to make it easier to identify missfires and detonations, I aim at
> 50-100samples/second. I don't even know if it is possible to detect these
> things with the slow sensors we turbo guys has to use.
>
> Jörgen Karlsson
> Gothenburg, Sweden
>
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