Results 1 to 7 of 7

Thread: Deceleration Fuel adjustment

  1. #1
    Supporting Member Turbo Mopar Contributor turbo84voyager's Avatar
    Join Date
    Jul 2008
    Location
    Nanticoke PA
    Posts
    805

    Deceleration Fuel adjustment

    I need some advice as to where I should make adjustments to the fuel curve when decelerating. In my 2.5 g-head cal when decelerating my wideband goes full lean when decelerating. If I just slightly rest my foot on the throttle it stays in range. Do I adjust fuel baseline?? and is there anyway to increase it higher than the next point. D-cal seems to limit it to the same or less than the next point. Any advice would be appreceiated.


    Justin
    Justin
    84 Plymouth Voyager LE 2.5 Intercooled Turbo 5-spd - Only 84 Turbo Van!
    89 Dodge Caravan ES 2.4 SRT-4 Intercooled Turbo (46 trim, OS Valves, CP Pistons, Eagle Rods, NPR IC) Built 31th trans
    91 Dodge Shadow Convertible 2.5 Intercooled Turbo A555 5-spd
    01 Pontiac Grand Prix GTP - 3.8 supercharged! Only 5K miles....
    01 Subaru Forester - Daily Driver
    07 Yamaha FJR 1300 140+ HP on 2 wheels
    85 Honda Nighthawk 450
    94 Bobcat 763 Skidloader 2.2 Kubota Diesel
    SV-SDAC Member

  2. #2
    Supporting Member II Turbo Mopar Contributor A.J.'s Avatar
    Join Date
    Feb 2006
    Location
    Mesa, AZ
    Posts
    2,427

    Re: Deceleration Fuel adjustment

    I adjusted mine to shut fuel off under lighter vacuum (23"HG as oppose to the factory 26"HG). I forgot what tables I adjusted. I'll look it up when I go to work tomorrow and post it when I get home.

    What do you mean by:

    Quote Originally Posted by turbo84voyager View Post
    and is there anyway to increase it higher than the next point. D-cal seems to limit it to the same or less than the next point. Any advice would be appreceiated.
    Justin
    Could you phrase it another way so I can understand what you want to do.

    A.J.

  3. #3
    turbo addict
    Join Date
    Dec 2005
    Location
    Spokane, Wa
    Posts
    9,046

    Re: Deceleration Fuel adjustment

    what's wrong with the a/f going full lean when your off the gas and coasting in high vacuum?? It's saving you fuel and not hurting anything.

  4. #4
    Heroes never die, they just reload! Turbo Mopar Staff Frank's Avatar
    Join Date
    Dec 2005
    Location
    California, MD
    Posts
    9,183

    Re: Deceleration Fuel adjustment

    He is saying that it goes way lean when he just barely touches the throttle after deceleration. Similar problem to me.
    Frank Katzenberger
    Squirrel Performance - Home of the best turbo calc!!!
    http://www.squirrelpf.com


    91 Daytona Shelby - It is getting there

    87 Shelby CSX #418 - Near stock is a good thing!

    94 Bronco 302 XLT - Shorty Headers, 3" exhaust, cold air intake, & Soft top



    "... to get the best out of it, you have to go beyond the line. Where bravery becomes insanity. Shall I turn into this hairpin bend at a 100mph? Why not!"



    Visit the new Knowledge Center today!

    Check out the one and only Shelby Dodge Registry!

  5. #5
    Supporting Member II Turbo Mopar Contributor A.J.'s Avatar
    Join Date
    Feb 2006
    Location
    Mesa, AZ
    Posts
    2,427

    Re: Deceleration Fuel adjustment

    When I'm in decel my fuel shuts off. I barley touch the throttle and it's back into the 14's. I don't have the problem your having. But I'll still look to see which tables I adjusted for fuel shut off. Now that I think about it, I think I adjusted all three to shut it off. I'll try to take a snap shot of the screen and post it.

    A.J.

  6. #6
    Supporting Member Turbo Mopar Contributor turbo84voyager's Avatar
    Join Date
    Jul 2008
    Location
    Nanticoke PA
    Posts
    805

    Re: Deceleration Fuel adjustment

    Sorry for the first message. I guess my cal is ok. Mine is only lean when decelerating, when I hit the throttle it goes back into the 14's. I wasnt sure if it was a problem being as lean as it was decelerating. For example exiting a highway with no throttle my AEM wideband reads 17.0 to --- (full lean). I want sure if this would be a problem on one of our engines. What I meant in the first message is that if I would barely touch the throttle decelerating, it would shoot to the 14's.
    Justin
    84 Plymouth Voyager LE 2.5 Intercooled Turbo 5-spd - Only 84 Turbo Van!
    89 Dodge Caravan ES 2.4 SRT-4 Intercooled Turbo (46 trim, OS Valves, CP Pistons, Eagle Rods, NPR IC) Built 31th trans
    91 Dodge Shadow Convertible 2.5 Intercooled Turbo A555 5-spd
    01 Pontiac Grand Prix GTP - 3.8 supercharged! Only 5K miles....
    01 Subaru Forester - Daily Driver
    07 Yamaha FJR 1300 140+ HP on 2 wheels
    85 Honda Nighthawk 450
    94 Bobcat 763 Skidloader 2.2 Kubota Diesel
    SV-SDAC Member

  7. #7
    turbo addict
    Join Date
    Dec 2005
    Location
    Spokane, Wa
    Posts
    9,046

    Re: Deceleration Fuel adjustment

    nope you're good.

Similar Threads

  1. Fuel cut with stage 4 cal?? wtf?
    By Mysterio in forum "I need help!"
    Replies: 11
    Last Post: 05-24-2007, 06:58 AM
  2. something not right in my fuel system.....(long)
    By Murphy in forum Electrical & Fuel System
    Replies: 3
    Last Post: 01-10-2007, 01:48 AM
  3. Fuel problem again?!?!
    By tryingbe in forum Electrical & Fuel System
    Replies: 13
    Last Post: 08-13-2006, 12:47 AM
  4. Fuel System
    By Frank in forum Old FAQ Info
    Replies: 0
    Last Post: 12-17-2005, 02:46 PM

Posting Permissions

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