Does the ECU have to "learn" you have at cat-back exhaust?

[white trash wagon]

I put a dynomax cat back exhaust in my Ranger. After the install I started it up & let it idle for about a minute.

Then I took a 2-3 mile test drive & the truck didn't seem to have any more power, although the engine did rev easier going through the gears. A couple hours later, I drove over to my girlfriend's house (6 miles), same thing - no real extra power. But when I left to drive home, it was a bit quicker.

Does the ECU have to "learn" the new exhaust & retrim the fuel curves before power is optimized?

[majorownage]

What year?

Eec IV or V?

A cat-back isn't really going to be felt anyways.

[Whiteboy]

What year?

Eec IV or V?

A cat-back isn't really going to be felt anyways.

I agree.
You wont feel the power gains of a catback.

[white trash wagon]

what year?

Eec iv or v?

A cat-back isn't really going to be felt anyways.

2001

[majorownage]

2001

The eec will easily compensate. The long term and short term fuel trims might change a bit, but nothing really other than that.

If you want power, go with a 50 shot.

[Cooter]

very few automotive ECM's have adaptive logic that would compensate for something like that.

an 01 Ranger is not one of them

[majorownage]

very few automotive ECM's have adaptive logic that would compensate for something like that.

an 01 Ranger is not one of them

Ford eecs are very powerful. They'll easily adapt to a cat-back system.

[Cooter]

Ford eecs are very powerful. They'll easily adapt to a cat-back system.

you've already proven you're a fucking moron

the point is the logic doesn't change. it's not a learning/adaptive logic. it's a fixed program. an exhaust system isn't going to change the tuning, and the tuning isn't going to take days/weeks to "adapt"

[shumpertdavid]

He's somewhat correct about the long and short term fuel trims. The computer will compensate for small changes (mostly going to be from small vacuum leaks, old/slow switch o2 sensor, dirty mass sensor, etc), however when they get to a certain point in the threshold (@ + or - 15%) it will set rich or lean codes. Some form of tuning is the only real way to compensate for any changes needing a\f or ignition timing changes.

[majorownage]

you've already proven you're a fucking moron

the point is the logic doesn't change. it's not a learning/adaptive logic. it's a fixed program. an exhaust system isn't going to change the tuning, and the tuning isn't going to take days/weeks to "adapt"

You obviously have proven you know nothing about EEC IV/V.

Now please GTFO of the thread if you don't have anything to contribute.

[majorownage]

He's somewhat correct about the long and short term fuel trims. The computer will compensate for small changes (mostly going to be from small vacuum leaks, old/slow switch o2 sensor, dirty mass sensor, etc), however when they get to a certain point in the threshold (@ + or - 15%) it will set rich or lean codes. Some form of tuning is the only real way to compensate for any changes needing a\f or ignition timing changes.

EEC Vs have long and short fuel trims. It is learned off of low load situations when the AFR is commanded to be stoichiometric. The o2 sensors are used to "tune" the trims in a closed loop feedback system. These values are stored, and extrapolated to high load situations when the AFR is richer and o2 sensors can't be used.

[MstangsBware]

very few automotive ECM's have adaptive logic that would compensate for something like that.

an 01 Ranger is not one of them

Actually most automotive ECU/ECM/PCMs have adaptive logic and have since the mid 80s.

[white trash wagon]

Well, on the way to work I could tell a definate increase in power.
Especially at highway speeds. I'm quite happy with the sound, just a
deeper pitch, not ricey at all (this is a 2.5). No drone at all