Blowers & the ECM

[Bruce Plecan]

The key to all the WOT stuff is having enough resolution to properly
calabrate it.  If you MAF (as an example) pegs at 255 at 2,800 then your in
trouble.   Because you going to have to run the same fuel when the MAF pegs
as at max load.  So at 2,800 you might be at 9.8 to have 11.8 at 5,600.
   This pasting of things together is from when there were no software clues
about what to do.
   Granted at times some Hardware Kludging is needed, just at this stage
using software makes it alot more tunable.
   His first answer should pretty well clue you in about where he's playing
from... <sigh>
Bruce



From: "Bob Wooten" <r71chevy at earthlink.net>
> as I was talking with the tech @ ATI about their blowers I wondered what
> they did about the MAP sensor.  He said "what do you mean, we don't do
> anything about it".  this lead to my confusion but then it became a bit
> clearer.  he said that all they recommend is that you put in the "proper"
> FMU, a "good" fuel pump & maybe a pressure operated retard system
depending
> on if it starts to knock.  then when I got to thinking about it, it did
make
> some sense.  when the motor is not under "power" (i.e. not in PE mode) it
is
> not going to have a pressure >1 BAR.  if that is the case then all is
happy
> with the map sensor & like wise with the motor.  when you get >1BAR the
> motor is under "power", in PE mode then it assumes 1 BAR @ WOT when it is
> actually >1BAR & it just does not know it.  the other thing that it does
not
> know is that the FMU has cranked up the fuel pressure so the motor ought
to
> be running "OK".
>
> this being said they are kind of tricking the ECM & the tune two ways &
not
> blowing up motors.  am I right in my thinking that this "works" but is not
> "right" or "the right way"?
>
> Tanx.
>
> Bob Wooten
> r71chevy at earthlink.net
> www.r71camaro.homestead.com
>
> --------------------------------------------------------------------------
--
> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>
>

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org