In Reply to: You asked posted by Jim Conforti on April 25, 2000 at 14:04:57:
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"
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With all do respect, isn't such a situation possible with a stock car anyway?
For example, I noticed the M3 pulls a lot like the Porsche Boxster in upper elevations (i.e. Lake Tahoe, NV/CA)
So we have hot uphill climbs, lower density air, and a load on the motor. The BMW DME compensates with the fuel mix and timing and probably more so the power loss is minimal. But the car runs fine. It might ping a bit maybe, but simple to back off the throttle a bit.
A less restrictive intake would allow more air in, that's about it. With the stock software changing mixture, the worst case would seems to be pinging under heavy loads.
Is the intake/modified issue an issue in that sense or does it include the cars stocks programming?