WBO2-Tuning Spreadsheet

[dave w]

Question:

All of the changes made to the Open Throttle VE table were a reduction in VE, as I would expect based on the rich AFRs during the capture of that particular log. However, there are 3 cells in Idle VE table that were modified by the spreadsheet that were all an increase in VE.... Two cells in particular, that are the same RPM and KPA between both tables, cells were increased in the Idle VE table, and, decreased in the Open Throttle. Possibly a spike of irrelevant data causing the discrepancy?

Welcome to the complex world of tuning. Change parameters, and see what happens in the spreadsheet (that's tuning). Typically increasing a VE cell value will lower AFR (richer). Typically decreasing a VE cell value will increase AFR (leaner). It's a good plan to have at least 5 data points (counts) in a VE cell, before making changes to the VE cell. It's a good plan the "Smooth" peaks and valleys in the VE Table.

Stating the obvious:
An engine requires less fuel at low RPM's and light engine load.
An engine requires more fuel at high RPM's and heavy engine load.
An engine needs more fuel to accelerate to 70 MPH, yet an engine needs less fuel to maintain 70 MPH once it achieves 70 MPH.

The VE Table is 3 dimensional, Load / Fuel / RPM, understanding the three statements above is 3 dimensional thinking.

dave w

[CDeeZ]

Welcome to the complex world of tuning.

Yeah tell me about it. Sometimes I wish I would have just jammed another LS in this truck like I did in my other TBI era OBS. Ironically, tuning an LS, even with a power-adder is easier for me. But, TBI is where I first started tinkering with EFI and it always has held a soft spot in my heart. It was the first transition from the era of carburetion into injection. And, TBI trucks just run forever and ever. Sure, you'll have burned up 3 or 4 anemic 4L60s in that time but the 300k+ mi TBI SBC is still going and doing what it was intended to do.

In a way it is cool though to have a strong TBI setup and keep the OBD1 era going, becuase OBD1 had to exist before anything that came after it.

In my interpretation of the data I mentioned above, I figured basically what you are saying about ignoring the spikes in the data and smoothing it all down as necessary.

Dave, your spreadsheet (and other contributions) have helped me and many, many others. I know Mark is pleased. I appreciate your efforts and I'll say this.... Just tell me where I need to mail the money for beer and hookers to say, thanks, and I will!

[dave w]

Dave, your spreadsheet (and other contributions) have helped me and many, many others. I know Mark is pleased. I appreciate your efforts and I'll say this.... Just tell me where I need to mail the money for beer and hookers to say, thanks, and I will!

Your public acknowledgement and kind words about my support of the board is both heart warming and very much appreciated!

dave w

[grumbolt]

good morning Dave w,

i am having a problem understanding the spreadsheet from post 25.. i was able to get everything set up and datalog and such...

i copy and pasted the large csv export from tuner pro to the "insert datalog" sheet.

the issue i am having is locating the data that is needed on the "near idle wbo2 correction" and the "off idle wbo2 correction" sheets more specifically i am having issue with locating the "near idle VE table from tunerpro" and the "off idle VE table from tunerpro" tables.

i can find tables in the history "blm (off idle)" and "blm (near idle)" but i read that the spreadsheet ignores blm entirely....

i am using "Advanced $0D TP5 v251.xdf" with "A217 $0Dtp5 v250.adx"

any help would be greatly appreciated.

thanks, grum.

[grumbolt]

i am having issue with locating the "near idle VE table from tunerpro" and the "off idle VE table from tunerpro" tables.

are "Idle VE vs. MAP vs. RPM" and "Open Throttle VE vs. MAP vs. RPM" the correct tables?

sorry to ask so many novice questions but i just dont want to make any mistakes.. i am sure as i become more acclimated to tuning, it will not seem so daunting lol..

thanks again, grum.

[dave w]

Yes, "Idle VE vs. MAP vs. RPM" and "Open Throttle VE vs. MAP vs. RPM" are the correct tables.

dave w

BPW Parameters.JPG

[grumbolt]

Yes, "Idle VE vs. MAP vs. RPM" and "Open Throttle VE vs. MAP vs. RPM" are the correct tables.

dave w

BPW Parameters.JPG

awesome, thanks.

i used that and then copied the prescribed values back to those tables after logging.

then i relogged and did it again with the fine tune numbers..

it seems to be much better now!

all the stuff i am using in tunerproRT including the log files and spreadsheets are located at http://robertweaver.net/tuning/

i think i have things kinda sorted out, i still have to do some logging and tuning while driving it around, but that will require someone to hold the laptop being that the buggy isnt super smooth and the terrain is anything but laptop friendly lol

i did see one thing that bothered me, while it was idling on log 2, everything seemed normal then everything dipped, the engine recovered and seemed ok, but i dont know what made it all dip almost to the point of stalling.

if you wouldnt mind taking a look and seeing if it looks like i am on the right track it would be greatly appreciated.

thanks again,
grum

the reason for the link above is the website would not allow me to upload the logs, xls, or csv files.