Re: 7749 guru needed....

["TK" <terryk@foothill.net>]

20 to 100 Kpa in steps of 10.

----- Original Message -----
From: Barry Tisdale <btisdale@cybersol.com>
To: <gmecm@diy-efi.org>; <gmecm@diy-efi.org>
Sent: Sunday, April 02, 2000 1:16 PM
Subject: RE: 7749 guru needed....


> Ok, just did some research in the 7749 SyTy F29 Closed Throttle table,
> trying to dope out the x-axis calibration.  My idle normally runs around
> 14-15"Hg vac, equivalent to ~50kPa, using a 3 bar MAP sensor.
>
> First, I set F29 & F30 back to stock values.
>
> THEN - started reducing only the 50kPa value at 600 & 800 RPMs.
>
> Boom - there it is, works as expected.  Cause & effect 100%.
>
> SO - the x-axis IS in kPas *not* in %age of MAP sensor output.  "50" would
> correspond to somewhere in the low boost range, not an idle value, if
those
> figures depended on the MAP sensor output.  Question remains, where *does*
> the BARO value come from?  Separate sensor in the ECU?  Doesn't seem to
> come from the MAP sensor, as the 3 bar value would be all wrong.
>
> Another thing here, is the 3 bar MAP sensor puts out, say, 2.5v @ 150kPa,
> where the 2 bar sensor puts this out @ 100kPa.  YET, changing the values @
> 50kPa, using a 3 bar sensor, profoundly affects the idle A/F, where even
> taking the values @ 30kPa to zero had no effect on the idle.  It would
seem
> that you'd have to multiply all the x-axis values by 1.5 when using a 3
bar
> sensor (30kPa would = 45kPa) in place of a 2.  Again, not, and how come??
>
> Reason the formerly zero-ed out values in the extreme upper left of the
> table had no effect was that they were *never* being accessed; just my
> reducing values in the F30 table produced the right idle A/F ratio.  Not
> the best way to go about things.
>
> Ok, now to re-do the idle, just using F29 CT table. One step ahead, one
back.
>
> Let's pool our info on this stuff, & I'll put together a "how to" paper
> when all's said & done.
> --------------------------------------------------------------------------
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