LTH = Installed, Review

Chris@FsP

The ecu only 'learns' in closed-loop mode, which is only used for idle/low load/cruise conditions. During acceleration, deceleration, and WOT (wide open throttle), the ecu relies on its pre-programmed fuel and ignition tables. That's why products like Osiris and Accessport exist, to reprogram what the ecu does at WOT.

UFreefer

That's good to know, I asked this question here the other day: How do you do a proper dyno comparison?

Funny how opinions and wrong info can turn into fact on message boards. Several people in other threads have been saying that the car will get faster and dyno higher after 20-60 miles. Which led me to start that thread. Dynoing would be a real pain if you to drive it around for awhile after each mod.

Daishi

So then why after a modification That hasn't been given time on the car power increases with each pull.

Chris@FsP

I haven't personally seen this trend first hand. I will, however, test this out in a couple of days when I dyno a customers 370Z. We already have baseline dyno's that were ran well after the mods were installed. If the ecu had adjusted for them in open loop, it would have been reflected on those pulls. Before I do these next set of pulls, I will reset the long term fuel settings. If what you are saying is correct, then I should, theoretically, lose power.

If I'm wrong, I'll gladly come back here and eat crow