Results 1 to 15 of 133

Thread: what im missing here

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1
    Fuel Injected!
    Join Date
    Aug 2013
    Location
    Finland
    Age
    42
    Posts
    70

    what im missing here

    ok.. specs first of all

    completly rebuild 4.3 tbi c1500 89 w/700r4

    0.30 over, 9.6:1cr, edelbrock 3714 cam, performer (3713) intake, stock heads, 30deg cut on valves, smoothened ports, stock exht. all sensors and ignition new, msd blaster coil.

    i have modified my stock aksb. bin, egr off, i have used winald to log my blm:s and got new values to VE map, added little spark for mid rpm and adjusted PE and AE values little..

    result... in closed loop, when moving some decent speeds, 30-70mph, i got 14.5-15.3 afr:s on cruise, on light acc afr goes momentarily up o 16-16-5 afr and when adding more tps ill got it richer, 13.5 approx at wot its 12.6-12.9 afr

    its not bad... but... from off idle or low speeds my acceleration is rather poor, rpm:s dont want to go up too quickly, its like having some 10 tons trailer on my tail... acceleration from 40 to 70 is almos twice faster than from 5 to 40 mph, and ill got only some 13.3 13.5 afr @wot...

    but that not all, bigger issue is my idle, when open loop, in park it idles 1150-1230 rpm@ 33-38 map and 15.7 to 16.7 afr.. too lean, little stumbles... dont know if its bad or not but canot get rpm lower... i have adjusted iac steps down (4 steps when warm) and opened the flaps to get better atomization but still no help, winald shows iac value 22 so somethign else opens iac so i wont get rpm:s lower or am i completly wrong?

    when engine is warm(rather warm, cannot get temp above 76C/168F) and been drivig in closed loop stopping in traffic or going in park, after some rpm drop in first few seconds it will run next 10 seconds decent idle... 700-725 rpm @ 14.5 afr and rather fine but soon afr:s goes over 16--> engine starts to stumble, vibrate and nearly dies, rpm( afr and map also) wonders around, rpm from 450 up to 900 rpm.


    im rather new in prom tuning, just trying to learn but now i cannot understant what im doing wrong in the idle and acceleration values.

  2. #2
    Fuel Injected!
    Join Date
    Feb 2013
    Location
    Euless, TX
    Posts
    2,308
    Quote Originally Posted by rytari View Post
    ok.. specs first of all

    completly rebuild 4.3 tbi c1500 89 w/700r4

    0.30 over, 9.6:1cr, edelbrock 3714 cam, performer (3713) intake, stock heads, 30deg cut on valves, smoothened ports, stock exht. all sensors and ignition new, msd blaster coil.

    i have modified my stock aksb. bin, egr off, i have used winald to log my blm:s and got new values to VE map, added little spark for mid rpm and adjusted PE and AE values little..

    result... in closed loop, when moving some decent speeds, 30-70mph, i got 14.5-15.3 afr:s on cruise, on light acc afr goes momentarily up o 16-16-5 afr and when adding more tps ill got it richer, 13.5 approx at wot its 12.6-12.9 afr

    its not bad... but... from off idle or low speeds my acceleration is rather poor, rpm:s dont want to go up too quickly, its like having some 10 tons trailer on my tail... acceleration from 40 to 70 is almos twice faster than from 5 to 40 mph, and ill got only some 13.3 13.5 afr @wot...

    but that not all, bigger issue is my idle, when open loop, in park it idles 1150-1230 rpm@ 33-38 map and 15.7 to 16.7 afr.. too lean, little stumbles... dont know if its bad or not but canot get rpm lower... i have adjusted iac steps down (4 steps when warm) and opened the flaps to get better atomization but still no help, winald shows iac value 22 so somethign else opens iac so i wont get rpm:s lower or am i completly wrong?

    when engine is warm(rather warm, cannot get temp above 76C/168F) and been drivig in closed loop stopping in traffic or going in park, after some rpm drop in first few seconds it will run next 10 seconds decent idle... 700-725 rpm @ 14.5 afr and rather fine but soon afr:s goes over 16--> engine starts to stumble, vibrate and nearly dies, rpm( afr and map also) wonders around, rpm from 450 up to 900 rpm.


    im rather new in prom tuning, just trying to learn but now i cannot understant what im doing wrong in the idle and acceleration values.
    Sounds like a vacuum leak to me and the IAC is one as well.

    This method of setting the minimum idle worked well for me.

    A.) With a warm engine and the Key OFF Jumper A to B on the ALDL connector
    B.) Turn key on and wait 30 seconds
    C.) Unplug IAC and turn off the a/c and all electrical loads.
    D.) Unjumper the connector and start the truck, may take a little throttle to get it to stay running.
    E.) Set the minimum idle about 50-100 rpm below the controlled idle.
    F.) Shut-off engine and reconnect the IAC.

    Have you set the timing correctly by disconnecting the EST connector and setting the base timing to 0°?

    I bet ultimately you need some higher flowing 305 injectors with your setup.

    Post up a .BIN file for us to see where you are now. Datalogs would also be helpful.
    Last edited by Fast355; 10-13-2013 at 10:59 PM.

  3. #3
    Fuel Injected!
    Join Date
    Sep 2012
    Location
    washington indiana
    Age
    69
    Posts
    884
    which ecm are you using? down load tuner pro an post a data log.

  4. #4
    Fuel Injected!
    Join Date
    Aug 2013
    Location
    Finland
    Age
    42
    Posts
    70
    Quote Originally Posted by Fast355 View Post
    Sounds like a vacuum leak to me and the IAC is one as well.

    This method of setting the minimum idle worked well for me.

    A.) With a warm engine and the Key OFF Jumper A to B on the ALDL connector
    B.) Turn key on and wait 30 seconds
    C.) Unplug IAC and turn off the a/c and all electrical loads.
    D.) Unjumper the connector and start the truck, may take a little throttle to get it to stay running.
    E.) Set the minimum idle about 50-100 rpm below the controlled idle.
    F.) Shut-off engine and reconnect the IAC.

    Have you set the timing correctly by disconnecting the EST connector and setting the base timing to 0°?

    I bet ultimately you need some higher flowing 305 injectors with your setup.

    Post up a .BIN file for us to see where you are now. Datalogs would also be helpful.
    7747 ecm that i use, below bin for you guys... base timing is now 2° and i have change value for it in table also... i have set idle to 700 rpm when iac unplugged (when opening the flaps for better atomization)

    if i have to change injectors, would it be better go up to 350 injectors, just because some day if i get this running well i maybe try to get prom for e+85 fuel also...

    i dont have latest datalog saved, ill have to try drive someday to get it also...
    Attached Files Attached Files

  5. #5
    Fuel Injected!
    Join Date
    Sep 2012
    Location
    washington indiana
    Age
    69
    Posts
    884
    try this bin but it is for a stander trans
    Attached Files Attached Files

  6. #6
    Fuel Injected!
    Join Date
    Feb 2013
    Location
    Euless, TX
    Posts
    2,308
    I found a BIG problem in your old .BIN.....VE1+VE2 = over 100% Values over 100% are limited to 100%. Your fuel adjustments to VE 1 and VE 2 are doing NOTHING with totals above 100%.

    Not to mention I found your timing table full of negative values.

    I also found issues with your air/fuel ratio target tables. Several of the tables are added togather and giving you commanded air/fuel ratios that are hitting the lean limit of 16.5:1!!! LEAVE THESE VALUES ALONE UNTIL AFTER THE VEs are TUNED.
    Attached Images Attached Images
    Last edited by Fast355; 10-14-2013 at 02:09 AM.

  7. #7
    Fuel Injected!
    Join Date
    Feb 2013
    Location
    Euless, TX
    Posts
    2,308
    Quote Originally Posted by Fast355 View Post
    I found a BIG problem in your old .BIN.....VE1+VE2 = over 100% Values over 100% are limited to 100%. Your fuel adjustments to VE 1 and VE 2 are doing NOTHING with totals above 100%.

    Not to mention I found your timing table full of negative values.

    I also found issues with your air/fuel ratio target tables. Several of the tables are added togather and giving you commanded air/fuel ratios that are hitting the lean limit of 16.5:1!!! LEAVE THESE VALUES ALONE UNTIL AFTER THE VEs are TUNED.

    I fixed what I saw and altered a few other things with values from a similar build. The timing map is one I created for a 4.3 Astro Van build I tuned that had flat-top pistons and a CPI cam in it with TBI heads.

    I would cautiously try it while monitoring the AFR and knock. This .BIN is fairly aggressive at higher RPM with 26-28* of timing from 4,600-5,600 RPM and a moderate advance curve for a heavy, undergeared vehicle with a stock torque converter. It shows 22* at 3,600 rpm, but i have the adder set for 2.5/1k and max of 5,600.
    Attached Files Attached Files
    Last edited by Fast355; 10-14-2013 at 02:46 AM.

  8. #8
    Fuel Injected!
    Join Date
    Aug 2013
    Location
    Finland
    Age
    42
    Posts
    70
    Quote Originally Posted by Fast355 View Post
    I found a BIG problem in your old .BIN.....VE1+VE2 = over 100% Values over 100% are limited to 100%. Your fuel adjustments to VE 1 and VE 2 are doing NOTHING with totals above 100%.

    Not to mention I found your timing table full of negative values.

    I also found issues with your air/fuel ratio target tables. Several of the tables are added togather and giving you commanded air/fuel ratios that are hitting the lean limit of 16.5:1!!! LEAVE THESE VALUES ALONE UNTIL AFTER THE VEs are TUNED.

    thats little strange, for the timing, i only added few deg to orginal aksb.bin in middle area rpm range, i got knok over 3k rpm when adding more above it...

    for ve values you are correct.. it seems that i have done something wrong with it.. but that 100% been fine :) it worked.. i got decent afr:s :) for acceleration i think ther might be the reason but none of this helps for my idle still, i think...

    today was cold morning, -6.9C and car started well.. but running lean, 15 to 17 afr when open loop idling and accelerating slightly, cruise and wot fine...

Similar Threads

  1. Seeking Your Advice And One Missing BIN
    By Raven_Mad in forum GM EFI Systems
    Replies: 7
    Last Post: 08-09-2012, 09:54 PM
  2. 8D/8DMOD/super8Dm.xdf missing items
    By 34blazer in forum GM EFI Systems
    Replies: 5
    Last Post: 04-06-2012, 03:00 AM
  3. The case of the missing pictures
    By historystamp in forum GearHead EFI Forum Support
    Replies: 6
    Last Post: 01-06-2012, 11:21 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
  •