There is a noticable problem after every upshift where the narrow band reports lean just after the shift and sits there for a while. I'm not going to say how I've tried to fix it because I'd like to hear what some people would do to go about fixing this.
I will say that I've tried adjusting the MAP AE a bit but not drastic and still no change. I'm also registering no knock counts on either the msb or lsb.

 

Two questions :

1) Is this with a constant TPS?

2) BLM/INTs are such that you're not jumping to a cell that's leanting things out after the shift...?

Thanks!

 

Depends alot on how lose/tight the converter is, and stall speed.
A loose 9", 4,500 stall converter, hardly changes.
With so many factors that can change so much from car to car dunno, what common factor there'd be.

Not to mention that the gear spacing means alot. ie 1-2 with a 700R4 is vastly different then with say a 400, or 6 Spd.

And while the first gear change is at like 30 MPH, the second at 60ish, and then high at about 100, the areo loadings are changing as well as the torque multiplication.

 

It isn't nearly as bad at higher throttle positions. It happens at constant throttle opening at say... 15%. Very light acceleration where the transmission shifts all happen below 32mph including the tcc lockup. The converter is a 2800 stall 12" continental lockup. It flashs to 2800 and slips to about 2300 under normal acceleration, 2600 under harder accel.
The lean spot happens and it drives me nutz. The BLM cell changes are definatly happening but I can't see why that would be an issue when all my BLMs are right around 128.

 

Could the throttle following of the IAC be leaning you out for that instant then closing down coming back to stoich again?
Something to try if you havn't already.

 

Good idea I'll take a look.

 

Each gear has progressivley less torque multiplication, so the engine sees more and more load after/during the shift.

Does the Int change, as the AFR comes back?.

How fast of BL update are you using?.

Is it tickling the DE with the RPM drop?.

Is it changing cells during the shift?.