Ronny

iTrader: (1)

I purchased a rebuilt 8746 and had it EBL'd late summer of 2006. I had no eprom nor calpack. Added a Prominator which replaces the need for eprom. No calpack installed.

I found that the VE tables were quickly maxed to 100 in some areas 2600-3000 rpms during datalogging. To get them under 100 so as to allow further tune I had to increase the BPC. 80 lbs inj at 20 lbs FP(non VAFPR). So I upped BPC 5 from say 88 again and again. I ended up at like 145 before the VE ended at <100%. No vac leaks that I can find. NB heated sensor just behing header flange

Apparently the lack of calpack changes the firing order to the injectors it was said. That would explain the fudged BPC. Also I needed to change the OL coolant based tables. They were stock EBL tables and showed very lean(WB02) even at 145 BPC? I enrichened ratios about 20%(.80). I dont recall changing the cranking or choke tables as on cold cold start it would initially run at 12.5/1 and then after choke timed out would run 14.5/1 using the fudged OL A/F tables untill CL.

Last week added the calpack. Dot on it facing away from harness side of ECU. Did not change the BPC nor the .bin it was running on. Result was that BLM's seemed reasonable and OL cool engine went to 11.9/1 until it flipped CL and showed 14.5/1.

So changed the BPC to 90(80lbs injsat 19 lbsFP) and changed the OL tables to that of stock EBL. That caused some issues. OL tables went very rich 10.9/1 (WB) this morning on cold cold start and car struggled to stay running at idle in driveway. Left driveway at 120 F coolant temps and was drivable but obviously not running right as very rich. Eventually hit 160F and went CL and was 14.9/1 on WB and BLM's pegged at max 172. Did not do Learn at any RPM's over 3000 but will soon. Will need to add to lower VE tables manually outside of Learn.

Why is the OL running excessivly rich? Where did I go wrong?

Ronny

iTrader: (1)

ttt

RBob

iTrader: (1)

The CALPAK was installed, the BPC moved from 145 to 90, and the O/L AFR table was changed. The change in BPC would have reduced the PW. Without the CALPAK the injectors fire together on every other DRP. With the CALPAK the injectors alternately fire on every DRP.

If open loop was truely very rich then it would need to be an issue with that table. The high closed loop BLM shows that the stoich fueling is on the lean side.

RBob.

Ronny

iTrader: (1)

Thank you for explaining the change in PW due to DRP. That explains the need to change(fudge) the BPC way upward.

I will leave the BPC at 90 (well it should have been 115-my error) and will enlean the OL tables. Yes it was really rich. I never saw black smoke out of my tail pipe before on cold start like I did last visit. Car in shop locating an oil leak so will report back in a few days.

va454ss

iTrader: (1)

I thought the EBL came with the calpak installed?

Ronny

iTrader: (1)

I bought a rebuilt off ebay. it had no chip nor a calpack. I believe the 8746 serves multiple differing vehicles and 5.0L and 5.7L so that may explain no chip or calpack.

RBob

iTrader: (1)

It depends. Self-install, no. ECM sent in for conversion: if it has one it goes back out with it (same one). If it is sent in without one, it goes back out without one. In this case it is mentioned by email that one should be installed. Complete package (ECM, install, EBL) has the calpak included.

RBob.