problems with EFI car idle and pressure sensors

[Rich M]

Turbo engines have specific conditions, ie. throttle position and speed
alone do not uniquely infer manifold pressure conditions under all
conditions like a NA application would, so MAP is always required in these
applications. TPS still required for decent throttle response, as Bruce
says, MAP always lags TPS.
Cheers
Rich

----- Original Message -----
From: Matt Beaubien <mrbeau0 at yahoo.com>
To: <diy_efi at diy-efi.org>
Sent: Thursday, September 20, 2001 2:17 PM
Subject: Re: problems with EFI car idle and pressure sensors


> I would argue that if you move the throttle enough to
> change the airflow, the MAP value would change as a
> result.  The engine responds to manifold conditions,
> so that's really what's controlling the engine.
>
> Put one way: if the TPS change is small enough that
> MAP isn't affected, would the engine run different?  I
> would say no.
>
> Put another way:  if you had a turbo engine where MAP
> and TPS aren't "directly connected" (e.g. turbo lag),
> would you rather fuel based on TPS or MAP...?
>
> My two bits.
>
> Matt.
>
> --- Bruce <nacelp at bright.net> wrote:
> >
> > MAP will lag TPS.
> > Depends on what kind of response you want, and
> > intake tract ducting.
> > Bruce
> >


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