Results 1 to 7 of 7

Thread: Closed Loop Compensation Speed

  1. #1

    Default Closed Loop Compensation Speed

    Default is 3. The guide says you should go slower to 1 or 2 if the oxygen sensor is farther away from engine. Wouldn't you want the speed faster 4 or 5 the farther away it is? My wideband is in the downpipe, 16" down from a passenger side mounted turbo. If you add that to the drivers side crossover it's a long distance away. ???

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,733

    Default

    Scroll down to "Closed Loop/Learn Compensation": http://forums.holley.com/showthread....e-Tuning-Notes (EFI Idle Tuning Notes)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  3. #3
    Join Date
    Nov 2014
    Location
    Ont. Canada
    Posts
    1,394

    Default

    What's happening in the engine and what the WBO2 is seeing can be very different because of the time it takes for the exhaust to reach the sensor. If the Advanced Control is too fast, the Closed Loop will start chasing the AFR and the AFR will start oscillating. Slow is better than too fast.

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,733

    Default

    I know you dislike those higher Closed Loop Advanced Control numbers, but I've never used anything less than 4 or 5. The lower settings always made my Closed Loop Compensation lag behind at lower RPM. (1 or 2 is usually just a band-aid for the real problem.)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  5. #5

    Default

    So if you're WOT under boost and AFR is near the target, that's good. But what if it can't keep up and starts to lean out? Do you make it 2 or go up to 4?

  6. #6
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,733

    Default

    If the AFR can't keep up, then increase the number, but ensure the AFR doesn't oscillate.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  7. #7
    Join Date
    Nov 2014
    Location
    Ont. Canada
    Posts
    1,394

    Default

    Quote Originally Posted by lsxmaliu View Post
    So if you're WOT under boost and AFR is near the target, that's good. But what if it can't keep up and starts to lean out? Do you make it 2 or go up to 4?
    It usually doesn't happen at WOT because the exhaust flow is so fast. Under light cruise the exhaust flow is slow. Just look at your CL Compensation in your datalogs and you'll see it chasing the AFR if you have this problem.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
About us
Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR® Sprint® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers, Flowtech Headers, NOS Nitrous, Weiand, Earl's Performance Plumbing, or Diablosport - Holley products can give you the edge you need over the competition.
Join us