Results 1 to 15 of 91

Thread: Tuning '94 chev Suburban Big Block

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1
    Fuel Injected!
    Join Date
    Mar 2013
    Posts
    315

    Tuning '94 chev Suburban Big Block

    In the process of tuning a 1994 Chevrolet Suburban with a Big Block. Found a 0E mask binary that works good with the 16197427 ECU. The binary file found is a BJKW 0E. The 454 big block was bored and stoked to 489 cu in. The cylinder heads were replaced with Edelbrock Oval Port heads. Also an Edelbrock TBI to batch MPFI conversion intake manifold was installed. The throttle body now has the upper fuel portion taken off and lower portion used as an air valve with TPS and IAC.

    Today adjusted the cylinder displacement and fuel flow constant upward by the percentage of change in displacement. Burned a BJKW+ file to chip and installed in ECU. Set the Autoprom APU1 in the vehicle and recorded the BLMs for on and off idle. The idle BLMs are right on the money at 128. The off-idle BLMs need some adjustment and not all that bad.

    Need help in identifying which parameter to use in the tables of the BJKW 0E mask binary. I have attached a jpeg file of what I believe are the applicable parameters. Would like confirmation from you folks that I am headed in the proper table items to modify the on and off-idle VE tables. Trying to locate and identify the two VE table to use to apply BLM spreadsheet corrections to. Also attached is the BJKW 0E binary file for inspection. Please advise. Thanks.
    Attached Files Attached Files

  2. #2
    Super Moderator dave w's Avatar
    Join Date
    Feb 2011
    Posts
    6,268
    Open Throttle VE vs MAP vs RPM is for adjusting ~ Off Idle

    Idle VE vs MAP vs RPM is for adjusting ~ Near Idle

    It's a good plan to use closed loop data.

    dave w

  3. #3
    Fuel Injected! JeepsAndGuns's Avatar
    Join Date
    Sep 2011
    Location
    alabama
    Age
    41
    Posts
    1,702
    Have you adjusted the injector offset Vs battery voltage? Since you have installed MPFI injectors, this needs to be changed to match the new injectors as it can have a big effect on how it runs. Are you using junkyard injectors or ones from a aftermarket company?
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

    93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver

    99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.

  4. #4
    Fuel Injected!
    Join Date
    May 2011
    Location
    Pocono's PA.
    Age
    50
    Posts
    370
    How is the idle quality with your setup ? I wasn't able to stabilize the idle and have it be respectable with my 502 setup until I went to PFI mode with the '7427. You didn't mention camshaft so that might be a difference.

    Your setup is very similar to mine before I went with the 502 , my original 454 was also bored and stroked to 489 , although it wore first a set of Vortec heads then a set of AFR heads and a few different cams .

    TOM
    1994 3500 Dually , 502 (509) , 264HR , Edelbrock MPFI , PFI '7427
    1992 S-10 434 SBC/Tremec - '7427
    1986 Monte Carlo SS
    1984 S-10 , SAS, 496/700R4/205 , D44/14BFF -'7427
    1980 Z-28 496/700R4
    1979 Corvette 496/700R4
    1977 Olds 98 Regency 403/700R4

  5. #5
    Fuel Injected! JeepsAndGuns's Avatar
    Join Date
    Sep 2011
    Location
    alabama
    Age
    41
    Posts
    1,702
    Quote Originally Posted by Nasty-Z View Post
    How is the idle quality with your setup ? I wasn't able to stabilize the idle and have it be respectable with my 502 setup until I went to PFI mode with the '7427.
    I didnt even think about that. You did do all the required mods to run MPFI right?
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

    93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver

    99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.

  6. #6
    Fuel Injected!
    Join Date
    Mar 2013
    Posts
    315
    Quote Originally Posted by JeepsAndGuns View Post
    I didnt even think about that. You did do all the required mods to run MPFI right?
    As I explained to TOM, the Edelbrock conversion was done some 8 years ago. Unaware of all this stuff when it was done. Worked fairly well. Used Moates APU1 to make changes about which I knew absolutely NOTHING! Still it worked out after capturing the Edelbrock binary supplied on their chip. Also purchased another programmed chip from which to extract data, although I had little idea about what I was doing. Still puzzled as to what the ECU mods really do. Still have not done them and yet the stock, with exception of the flash chip, ECU and Engine run just fine.

  7. #7
    Fuel Injected!
    Join Date
    Mar 2013
    Posts
    315
    Tom:

    No problems with idle quality after installing Edelbrock TBI to batch injected MPFI via the 16197427 ECU. Did not know about the injector offset vs battery voltage. The conversion was done some 8 years ago. Purchased Craig Moates AutoProm APU1 which was of the initial production run. Talked to Craig and received some advice from him. Unaware about modifying the ECU and Edelbrock said nothing about it. Just did the conversion and it worked out. The Edelbrock kit (chose 502 cu in kit w/29 Lb/Hr injectors) came with new Intake Manifold, new Magnetti Marelli Pico Injectors, new fuel pump, and new programmed memory chip for ECU and other small hardware.

  8. #8
    Fuel Injected!
    Join Date
    Mar 2013
    Posts
    315
    Quote Originally Posted by Nasty-Z View Post
    How is the idle quality with your setup ? I wasn't able to stabilize the idle and have it be respectable with my 502 setup until I went to PFI mode with the '7427. You didn't mention camshaft so that might be a difference.

    Your setup is very similar to mine before I went with the 502 , my original 454 was also bored and stroked to 489 , although it wore first a set of Vortec heads then a set of AFR heads and a few different cams .

    TOM
    TOM: Do you have a binary file for 489 or 502 big block that works in a 16197427 ECU? Did you do the upgrades to Edelbrock TBI to MPFI injection? Please advise. Thanks.

    Rolly

  9. #9
    Administrator
    Join Date
    May 2011
    Location
    Lakes Region, NH
    Age
    54
    Posts
    3,847
    Don't understand the PDF file with the table labeled with Constants.
    Rolly... You're over thinking this!

    There are three types of parameters; Constants, Flags and Tables.
    TunerPro has Scalars, Flags and Tables.
    A scalar, by any other name, still does the same job.

  10. #10
    Fuel Injected!
    Join Date
    Mar 2013
    Posts
    315
    Dave:

    Thanks again for the assistance. Don't understand the statement "It's a good plan to use closed loop data". Please expand on the statement please. Thanks.

  11. #11
    Super Moderator dave w's Avatar
    Join Date
    Feb 2011
    Posts
    6,268
    Quote Originally Posted by rsicard View Post
    Dave:

    Thanks again for the assistance. Don't understand the statement "It's a good plan to use closed loop data". Please expand on the statement please. Thanks.
    Closed loop is when the computer takes full control of both fuel and spark based on the information from the sensors (Knock, TPS, O2, MAP, RPM, & CTS). Tune using only the data that was recorded when the computer was in closed loop.

    dave w

  12. #12
    Fuel Injected!
    Join Date
    Mar 2013
    Posts
    315
    Quote Originally Posted by dave w View Post
    Closed loop is when the computer takes full control of both fuel and spark based on the information from the sensors (Knock, TPS, O2, MAP, RPM, & CTS). Tune using only the data that was recorded when the computer was in closed loop.

    dave w
    Dave: Did exactly that with a BJKW 0E altered binary and the Suburban is running fairly well. In the process of using your spreadsheet and BLM data to correct the BJKW binary. Looks to be a VERY good method/process. Again, thanks for all your assistance.

    Regards,

    Rolly
    Tucson, Arizona

Similar Threads

  1. Hello, 93 TBI 454 K2500 Suburban DD/Tow Rig
    By slobrorunner in forum Introductions
    Replies: 2
    Last Post: 08-02-2014, 07:16 AM
  2. '71 Chev pick up 4L60E swap.
    By Six_Shooter in forum Gear Heads
    Replies: 13
    Last Post: 12-13-2013, 05:28 AM
  3. First time start up, too much fuel. 350 chev 7747,
    By live2wheel in forum GM EFI Systems
    Replies: 19
    Last Post: 07-03-2013, 02:58 AM
  4. 1227747 IAC wiring to IAC for Big Block and Small Block
    By EagleMark in forum Fuel Injection Writeups Articles and How to New and Old
    Replies: 0
    Last Post: 10-05-2012, 11:47 PM
  5. Replies: 5
    Last Post: 09-08-2012, 11:24 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •