RE: use of MAP in FI calcs

[Len Sabatine <sabatine@epix.net>]

  My understanding, on "Startup", scan = "New"
value used for Cal / learn ,current  "run cycle",
  [Engine running time ]. Values are round up / down # from actual
barometer reading.
  Reset on each startup according to the General . Notice in data
scan KOEO ,
  Baro, Map , Ect , Iat,  readings are live [ if present ] on a
specific controller's data display.
  Some config s use the map value to infer bar o # on Key on IGN =
Scan.
  Mother nature enters bleed orifice in MAP sensor.
  Correct me if this information is inaccurate.
 
  Len

> If I remember correctly GM does a baro calc
> when the engine is shut
> down....never did figure out whether this happens at key on
> also...anybody??
> -Carl Summers
>
>
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> -----Original Message-----
> From: owner-gmecm@diy-efi.org
> [mailto:owner-gmecm@diy-efi.org]On
> Behalf
> Of Heelandtoe@aol.com
> Sent: Thursday, September 07, 2000 6:18 PM
> To: gmecm@diy-efi.org
> Subject: use of MAP in FI calcs
>
>
> I've noticed that in most ECM's all the tables that use MAP as an
> index
> stop
> at 100 kPa.  Since its conceivable that MAP could go above 100 kPa
> on a high
> pressure day at WOT, I'm betting that the computer normalizes it with
> the
> barometric pressure as in mapbar = 100 * map/baro. This would account
> for
> the
> day to day variation in barometric pressure and normalize mapbar so that
> it
> better represents true engine load.  Have you guys seen any
> similar
> operations in your disassemblies?
> jc
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