Spent the last week and a half tuning the stock 98 LeSabre with the DHP PowrTuner to get some baseline data. Installed the ported LIM yesterday, with no other changes apart from a Bill Buttermore sleeved EGR tube. Butt dyno said YESSSSS!!!!!!!!!!!!!!!
But I wanted some hard data....so I spent today doing a VE tune on the ported LIM. Here are the compared results:
As you can see, the Stock PCM "tune" is crap...in fact, the VE table is ď0.8í*Ē at all MAP and rpm values (GM must have laid off all the engineers in 1997).
On the stock LIM at 100kPa MAP, tuned VE peaked at 0.96 at 4000 rpm. After installing the ported LIM and re-doing the VE tune, VE at 100kPa MAP peaked at 1.01 at 4400 rpm (about a 5% increase in peak VE). Furthermore, the ported LIM was higher in VE at all engine speeds >=2400 rpm.
The torque peak appears to have shifted upward by some 400rpm. I would ballpark estimate an increase in torque of about 15-20 ft lb over stock, peaking at 4400rpm, and an increase of some 10-12 hp over stock, peaking at 5200rpm.
Not only that, but the ported LIM seems to have significantly reduced both the frequency and severity of KR. Looking back over the scans, and including only frames in fuel cells 2, 3 and 4 (i.e., accel only, no decel or idle), I did this analysis on KR:
Average 41% of frames with KR
Median KR value of 3.6 (in frames with KR)
Average 16% of frames with KR
Median KR value of 1.7 (in frames with KR)
These are some truly awesome results overall, and I am very happy with this $40 mod.
EDIT: For those coming late into this thread, bear in mind that this 98 L36 engine is bone stock, except for a 180 degree drilled t-stat.
EDIT 2: All tuning work was done at external temps 70-75 degrees F, and on the same driving route, trying to replicate each drive as closely as possible.