Using VE Analyze and not "tip in from a stop, i stall"...

[ducman82]

ran some "auto tune" while on the highway today and putting around town. cars snappy and runs great.... BUT...... i noticed that off the line "tip in" as it were, she dies some times. stumbles for s split second...... half a second. got a data log of it as i went to pull in my driveway.

idles fine and everything.... so not sure what is up

[kjones6039]

I know nothing about MS3, but I would be reducing your TPSdot value. 200 seems a bit much. (I run mine at ~40 FWIW.... but I use TPS accel. ONLY)

Ken

EDIT: Just curious..... Are you using VE Analyze to tune idle & low rpm?

[slow_hemi6]

According to the logged AFR it is too lean. mostly it is in the 16 to 17:1's.

[kjones6039]

According to the logged AFR it is too lean. mostly it is in the 16 to 17:1's.

Boy howdy!!!! I hadn't looked at his log....... Just looked at the MSQ and noticed that accel might need some work.

Ken

[ducman82]

Hmmm it sure did lean out... odd.

i was just driving around with the Analyze going. ill have to read more in to the TPS dot stuff.

[kjones6039]

Still wondering.... if you are using VE Analyze to tune low rpm and idle.....

Ken

[slow_hemi6]

I think you will find, and why Ken is asking, that when starting to tune most people need to filter out or lock out the VE cells, for idle areas,(set this afr manually) and preferably also filter or lock out the VE cells directly below idle, (decell) area of the map (these should not really be less VE than idle). If allowed VEAL can clobber your idle VE area under decel because the engine does run through this area in that transition but AFR is heavily dependant on the preceeding VE cells in the decell path.