'7060 to '7427 conversion - remaining fuel trim issues

[dave w]

Thanks Dave. Starting to make sense. But what happens when the NBO2/BLM doesn't agree with what the WBO2 is saying? I'll explain with an example. I took my last data log and copied the BLM (off idle) and WBO2 output tables from TP into a spreadsheet. I then normalized both: BLM I divided by 128, WBO2 I divided by 14.7. Then I combined those ratio values into a single table so I could easily see where they differ. In the attached, the first number is the BLM ratio, second number is WB. It actually looks better than I thought it was going to, but there are still a number of cells where one is slightly lean and the other slightly rich. If I tune based on one of the values, won't it make the other one worse? BLM vs WBO2.jpg

I have also noticed the differences between BLM vs. WBO2. I consider WBO2 to more accurate. I tune with either BLM or WBO2.

I recently helped with a California Emission tune. BLM failed, WBO2 passed.

Data Below is California Emissions Pass. BLM's are very lean with AFR's looking good.

BLM - Near Idle.jpg

BLM - Off Idle.jpg

Near Idle.jpg

Off Idle.jpg

PE Active.jpg

[brian617]

Not sure what brand o2 you're using, but I like Denso or NTK heated o2s.

[dave w]

For WBO2 I like the AEM 30-4110 https://www.aemelectronics.com/produ...uego-afr-gauge

The AEM 30-4110 is plug-n-play with 16197427 WBO2 Hack.

dave w

[Daveo91]

Not sure what brand o2 you're using, but I like Denso or NTK heated o2s.

I'm using a Delco AFS74 heated sensor. When I replace I may consider one of these two.

For WBO2 I like the AEM 30-4110 https://www.aemelectronics.com/produ...uego-afr-gauge

The AEM 30-4110 is plug-n-play with 16197427 WBO2 Hack.

dave w

I have an AEM WBO2, but I think it's a different model. It integrates fine with the 7427; no complaints other than it doesn't match perfect with the NBO2 in some areas, but no reason to believe that's the WB's fault. I know the placement of both can make a big difference too. Your post that you have this disagreement between WB and NB sometimes too helped a bunch. It gave me more confidence that I'm not chasing my tail and I've started to worry less about BLMs being off in some areas.

I've actually made some good progress in a number of areas. Still some fine tuning to do in the lower RPM/higher MAP areas of the off idle table. CL idling doing well - after about 10 seconds it stabilizes at high 14s on WB. Has good "butt dyno" feel in pretty much all areas right now. Until today I was having a lot of problems with acceleration from start. It would always swing way rich (WB pegged at 10) and then sometimes swing way lean. Often the rich swing would cause a noticeable bog, especially when cold. I know the rich swing was wrong AE settings so I searched a number of different threads, including this one, specifically post #34, username = dud. His engine specs sounded similar to mine so I thought I'd just try out his AE settings. Wasn't expecting much, but was pleasantly surprised to find the rich swing and resulting bog is gone. It's still too lean at tip-in (in the 16s as soon as I feel movement, for about 2 seconds) so I know I have to increase something. Should I increase MAP by 10% as a start? Across the board, or just to part of the table?

[cgw]

Is there a conversion pinout somewhere to go from 7060 to 7427?

[dave w]

Attached are my notes from a '7060 - '7427 conversion I did several years ago. . . 1 Ton High Cube Van 7.4 liter / 4L80E.

dave w

[Daveo91]

Is there a conversion pinout somewhere to go from 7060 to 7427?

Here's the thread with my notes. Pinout attachments are in the first post. I've tried to keep it updated with a few revisions I've made since I first posted.

http://gearhead-efi.com/Fuel-Injecti...ll-the-trigger

[cgw]

You guys are awesome, thanks!!