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You asked (archive)

[ Follow Ups ] [ E36 M3 Message Board ] [ Msg. Board FAQ ]

Posted by Jim Conforti on April 25, 2000 at 14:04:57:

In Reply to: JimC Performance Software posted by Bob ///M3 on April 25, 2000 at 11:19:03:

So I'll answer..

First off, anything anyone else is telling you about my "normal" software working fine with
an intake is BS. The whole reason I developed
the "intake software" is to deal with a self-
protection function in the DME in your car.

Now... what's different between the Intake
and Normal versions.. JUST this function,
which is modified to now work with the Intake.

What happens..

Actually it's simple.. your intake allows more
air in that the stock one.. ANY intake does.

Under certain circumstances (detailed below)
the car will PASS above a threshold WITH an
intake, that it would not have WITHOUT the
intake. When it does this, the DME temporarily
increases the fuel mixture (rich) anywhere from
about 12% to 44%. This causes the car to bog
and is usually detected by the DME as a "misfire"

The conditions are:

1) High ambient air temp
2) High coolant temp
3) High air mass flow
4) Vehicle entering knock retard by some amount.

When all these factors collide, if the air mass
is just high enough and the God's are frowining,
the DME enters Catalyst Protection and FWOOOSH.

It dumps fuel to "cool down the cat"

It all has to do with a catalyst temperature model
inside the DME that never took into effect that
someone might change the intake.

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