Tuning '94 chev Suburban Big Block

[dave w]

It appears to me the posted .bin file has not been set up for MPFI. Maybe this is not the .bin file you modified for MPFI?

My previous post, with the .pdf files, outlines which Flags, Constants, and Tables in the .bin file must be modified for MPFI.

I think you need to do some homework modifying your .bin file.

dave w

[rsicard]

Dave:

That attached jpeg file has greatly added to an understanding of the conversion. Kept wondering what that table was keyed to. Now I know. Enlightening stuff. Thanks ever so much.

Rolly

[rsicard]

It appears to me the posted .bin file has not been set up for MPFI. Maybe this is not the .bin file you modified for MPFI?

My previous post, with the .pdf files, outlines which Flags, Constants, and Tables in the .bin file must be modified for MPFI.

I think you need to do some homework modifying your .bin file.



dave w

Dave:

In your attached JPEG file, there are five changes to the FLAGS. Is this the complete extent of the changes that need to be made? What was the table formed from? Was it from the HP Tuners fellow? Please advise. Thanks.

[1project2many]

Watching this thread myself, I have about 90% of what it takes to do the conversion on my Suburban. Just need to find the proper RP/Mercruiser injectors and a few other chicken shit items so I can get this thing back together in a timely manner. I hate letting a vehicle sit an extended period of time.

Not to drag this too far OT, but if you have Keihin injectors I've posted some flow info.

[rsicard]

It appears to me the posted .bin file has not been set up for MPFI. Maybe this is not the .bin file you modified for MPFI?

My previous post, with the .pdf files, outlines which Flags, Constants, and Tables in the .bin file must be modified for MPFI.

I think you need to do some homework modifying your .bin file.

dave w

Dave:


In your attached JPEG file, there are five changes to the FLAGS. Is this the complete extent of the changes that need to be made? What was the table formed from? Was it from the HP Tuners fellow? Please advise. Thanks.

[dave w]

Dave:


In your attached JPEG file, there are five changes to the FLAGS. Is this the complete extent of the changes that need to be made? What was the table formed from? Was it from the HP Tuners fellow? Please advise. Thanks.

There are three types of parameters; Constants, Flags and Tables.
You will also need to make changes the Constants and Tables. I've previously posted .pdf files that show what Constants and Tables need to be changed.

The MPFI conversion information was first posted on a HP Tuners website.

Do you need help making the MPFI changes to your .bin file (CHIP)? Setting up the .bin file is a good first step. Ultimately, you will need to "Tune" the CHIP using data logs.

dave w

[rsicard]

There are three types of parameters; Constants, Flags and Tables.
You will also need to make changes the Constants and Tables. I've previously posted .pdf files that show what Constants and Tables need to be changed.

The MPFI conversion information was first posted on a HP Tuners website.

Do you need help making the MPFI changes to your .bin file (CHIP)? Setting up the .bin file is a good first step. Ultimately, you will need to "Tune" the CHIP using data logs.

dave w

Dave:

Thanks much for the response. Now that it is better understood, I will attempt to change the .bin file using the three posted .pdf tables. Will start with original 454 .bin file and modify from there.

Rolly

[rsicard]

Dave:

Have you used this process in the past? Has it worked sucessfully other than having to tune the VE fuel map? Please advise. Thanks.

[dave w]

Dave:

Have you used this process in the past? Has it worked sucessfully other than having to tune the VE fuel map? Please advise. Thanks.

Yes, I've successfully used this process in the past. Tuning can include changing some of the injector values seen in the spreadsheet.

Overall, this process can extremely challenging for a beginner!

dave w

[rsicard]

Yes, I've successfully used this process in the past. Tuning can include changing some of the injector values seen in the spreadsheet.

Overall, this process can extremely challenging for a beginner!

dave w

Dave:

Thanks much for the reply. At first blush, changing constants, flags does not appear to be that difficult. The aspect that is not understood is "...Tuning can include changing some of the injector values seen in the spreadsheet..." Hard to relate to that statement. Please expand on same.

Regards,

Rolly

[rsicard]

Dave:

Please expand on "Tuning can include changing some of the injector values seen in the spreadsheet". Which injector values may have to be changed?

[dave w]

Dave:

Please expand on "Tuning can include changing some of the injector values seen in the spreadsheet". Which injector values may have to be changed?

Injector Flows: See attached screen shot of the previously posted spreadsheet / .pdf files.

dave w