Originally Posted by aswracing

The PowrPro doesn't tune to a specific AFR. It works by measuring the acceleration rate and changing the air/fuel ratio to give the best acceleration.

Furthermore, the factory ECM has no knowledge or understanding of wide band sensors. It only understands the stock narrow band sensors. So it's not like you can just go swap out your narrow bands for wide bands. That doesn't work.

There are, however, a couple of products on the market that are designed to essentially teach the ECM how to interpret and utilize wide band sensors. Rev Perf offers one, and the other is a brand new product (starts shipping this week) from Dynojet called "Target Tune" that works with the Powervision to implement closed loop wideband operation.

Dynojet has also been offering, for quite some time, a wide-band add-on kit for the Powervision. But they're only used when autotuning, they are not part of closed loop fuel control, and the factory ECM has no knowledge of them. Still, it's a great system, works very well.

If you want to know the big drawback to the T-Max, google up "Speed-Density vs. Alpha-N".

Personally, I view the Powervision as the best tuner device on market right now. It has a lot of features, not the least of which is how it greatly simplifies everything to have the little control/display unit to monitor everything going on and perform tuning. Thats huge for do-it-yourselfers especially.

Originally Posted by aswracing

Yeah, I didn't mean it as a reference for the T-max. My point is that the Delphi is a Speed-Density system (well mostly, it's actually a bit of a hybrid) and the T-max is an Alpha-N system. There's a fundamental difference between how those two types of fuel injection work. I think that if you read up on it, you'll find that Speed-Density is the better approach for an HD street motor application.

The Delphi EFI is really a very well designed system. Those Delphi engineers did a good job. Tuning it, as opposed to replacing it, makes a lot of sense.