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* What voltage indicates negative flow? Does the ECU use it?
* What voltage indicates negative flow? Does the ECU use it?
* Is MAP used in [[characteristic curve]] when ECU detects broken/unplugged MAF?
* Is MAP used in [[characteristic curve]] when ECU detects broken/unplugged MAF?
* Near the top of the MAF range, it seems to have a smaller and smaller effect on fueling. Does this mean that maxing the MAF isn't as bad as many believe?


===[[Lemmiwinks]]===
===[[Lemmiwinks]]===
* The [[load]] discussion in the [[lemmiwinks]] article is a now bit better, but still missing where the open/closed loop decision is made.
* High [[EGT]] (>980°C) and [[IAT]] (>120°F) corrections..
*# is there a flag for each, or is the correction progressive?
*# does it affect both fueling and timing?
*# does it affect req boost?
*# does it affect load calculations?


===[[Generations]]===
===[[Generations]]===
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*# Some are 2001, some are 2001.5 (no verification of this rumor)
*# Some are 2001, some are 2001.5 (no verification of this rumor)
*# Some 2001.5 came with h-boxes and do not appear to have F-hoses (doubtful, probably incorrect report)
*# Some 2001.5 came with h-boxes and do not appear to have F-hoses (doubtful, probably incorrect report)
*# Still trying to figure out what the AGB engine code is
* 05/01 and 06/01 cut-off date for 2001.5 and 2002 MY may not be 100% accurate
*# The 2001.5 Tiptronic is listed with build date of 05/01 with L or M box ECU.
*# The 2002 Tiptronic is listed as build date 06/01 with AA box ECU.
*# However, my 2002 Tiptronic has a build date of 05/01 and came with an AA box ECU.


==Articles that need work==
==Articles that need work==
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* is there tip/6sp variation?
* is there tip/6sp variation?


===[[Engine recode]]===
* different between ESP/non-ESP, but how does it interact with ABS and EDL?


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==Articles that need content==
==Articles that need content==
===[[ECU Explorer]]===
* USB driver howto
* registration key guide

===[[Load]] (aka [[Charge]]?) vs [[Torque]]===
* self study refers to the following "torques"
# external torque requests
# internal torque requests
# nominal inner torque (spec torque?)
* self study refers to the following "charges"
# actual charge (calc load?)
# nominal charging moment (spec load?)
# nominal charge (spec load corrected?)

===[[Open loop]]/[[closed loop]]===
===[[Open loop]]/[[closed loop]]===
* What determines which is used when?
* What inputs are used in each to determine fueling
* What inputs are used in each to determine fueling
** closed loop -> base maps + IAT?/EGT? correction + adapt channels + ltfts? (derived from stfts) + stfts?
** closed loop: req load-> base maps + adapt channels + ltfts (derived from stfts) + stfts?
*** stfts derived from narrow band
*** stfts derived from narrow band
** open loop -> base maps + IAT?/EGT correction + adapt channels + trims? + load (derived from maf)
** open loop: calc load (from maf) + req load -> base maps + EGT enrich + adapt channels
* What inputs are used in each to determine boost
* What inputs are used in each to determine boost
* What inputs are used in each to determine timing
* What inputs are used in each to determine timing
** base maps + IAT/EGT correction + retard (derived from correction factor)
** calc load (from maf) + req load -> base maps + IAT correction + retard (derived from correction factor)
*** correction factor derived from kvs
*** correction factor derived from kvs
* What inputs are used in each to determine throttle plate angle
* What inputs are used in each to determine throttle plate angle
** desired load (based on throttle position during partial throttle or target idle torque if throttle postion is zero) vs calculated load (based on MAF)
** req load (based on throttle position during partial throttle or target idle torque if throttle postion is zero) vs calculated load (based on MAF)
** add in cruise control, traction control, engine protection (e.g. [[throttle cut]])
** add in cruise control, traction control, engine protection (e.g. [[throttle cut]])

===[[EGT enrich]]===
* two thresholds
*# 980C, direct from EGT sensor, which does not read below 945C (1733F)
*# 500C, from calculated EGT, which is derived from load/RPM


===[[O2 sensor]]===
===[[O2 sensor]]===
* Narrow band - only accurate near [[stoichiometric]] A/F
* Narrow band sensor - only accurate near [[stoichiometric]] A/F. Only good for closed loop.
* Why get a wideband sensor for tuning?
* Wideband sensor - accurate everywhere! Great for tuning open loop.


===[[Knock control]]===
===[[Timing]] and [[Knock control]]===
* Relationship between KVs and timing correction factor
* Relationship between KVs and timing correction factor
** Direct?
** Direct?
** Filtered/corrected somehow?
** Filtered/corrected somehow?
** Are logged KV's corrected?
** Are logged KV's corrected?
* Relationship between IATs and timing maps

===[[Characteristic curve]]===
===[[Characteristic curve]]===
* When is it consulted?
* When is it consulted?
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* Is [[MAP]] used?
* Is [[MAP]] used?
* What if ECU detects broken/unplugged MAP?
* What if ECU detects broken/unplugged MAP?

===[[Manifold air pressure]]===
===[[Synchronous path]]/[[Asynchronous path]]===
===[[Synchronous path]]/[[Asynchronous path]]===
* Synchronous path outputs: [[VVT]], ignition timing, injector pulse width
* Synchronous path outputs: [[VVT]], ignition timing, injector pulse width
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* Delete howto
* Delete howto


===[[Master boost controller]]===
===[[Manual boost controller]]===
* Parallel vs series vs alone
* Parallel vs series vs alone
* Tuning
* Tuning
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* aka [[MAP]] clamp
* aka [[MAP]] clamp


===[[N75]],[[N249]],[[Wastegate]]===
===[[N75]], [[N249]], [[Wastegate]]===
* N75 controls wastegate
* N75 controls wastegate
** how is req. boost related to waste gate duty?
** why delete? (to use MBC, AVCR etc)
* N249 controls [[BPV]]
* N249 controls [[BPV]]
** why delete? (no conclusive proof of any advantages)

===[[RNS-E]] Nav information===
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Latest revision as of 19:49, 28 July 2011

The Community Portal is the central place to find out what's happening on S4Wiki. Learn what articles need to be written, what questions need to be answered, and what articles still need a lot of work.

If you wish to edit this page, please see Wikipedia's Community Portal for an example of how a wiki community portal should look.

If you are looking for other external Audi S4 related sites, check out the external links page!

To do lists

Questions that need answering

MAF

  • Bosch signal characterization
  • What voltage indicates "zero" flow?
  • What voltage indicates negative flow? Does the ECU use it?
  • Is MAP used in characteristic curve when ECU detects broken/unplugged MAF?
  • Near the top of the MAF range, it seems to have a smaller and smaller effect on fueling. Does this mean that maxing the MAF isn't as bad as many believe?

Lemmiwinks

  • The load discussion in the lemmiwinks article is a now bit better, but still missing where the open/closed loop decision is made.

Generations

  • There is some confusion with cars near the 09/00 build mark
    1. Some are 2001, some are 2001.5 (no verification of this rumor)
    2. Some 2001.5 came with h-boxes and do not appear to have F-hoses (doubtful, probably incorrect report)
    3. Still trying to figure out what the AGB engine code is
  • 05/01 and 06/01 cut-off date for 2001.5 and 2002 MY may not be 100% accurate
    1. The 2001.5 Tiptronic is listed with build date of 05/01 with L or M box ECU.
    2. The 2002 Tiptronic is listed as build date 06/01 with AA box ECU.
    3. However, my 2002 Tiptronic has a build date of 05/01 and came with an AA box ECU.

Articles that need work

Long term fuel trim/Short term fuel trim

  • These articles were directly stolen from this BMW OBD-II article. They need to be checked for accuracy wrt. the S4 and ME7.1

Glossary

  • huge disaster in general. currently just redirects to list of abbreviations. Should get rid of redirect and make a good one.

Bypass valve

  • need more part number information
  • need to reformat into a table
  • need more revision information (and pressure specs etc)

Cluster recode

  • verify there is only h-box/m-box encoding
  • is there tip/6sp variation?

Engine recode

  • different between ESP/non-ESP, but how does it interact with ABS and EDL?

Articles that need content

ECU Explorer

  • USB driver howto
  • registration key guide

Load (aka Charge?) vs Torque

  • self study refers to the following "torques"
  1. external torque requests
  2. internal torque requests
  3. nominal inner torque (spec torque?)
  • self study refers to the following "charges"
  1. actual charge (calc load?)
  2. nominal charging moment (spec load?)
  3. nominal charge (spec load corrected?)

Open loop/closed loop

  • What inputs are used in each to determine fueling
    • closed loop: req load-> base maps + adapt channels + ltfts (derived from stfts) + stfts?
      • stfts derived from narrow band
    • open loop: calc load (from maf) + req load -> base maps + EGT enrich + adapt channels
  • What inputs are used in each to determine boost
  • What inputs are used in each to determine timing
    • calc load (from maf) + req load -> base maps + IAT correction + retard (derived from correction factor)
      • correction factor derived from kvs
  • What inputs are used in each to determine throttle plate angle
    • req load (based on throttle position during partial throttle or target idle torque if throttle postion is zero) vs calculated load (based on MAF)
    • add in cruise control, traction control, engine protection (e.g. throttle cut)

EGT enrich

  • two thresholds
    1. 980C, direct from EGT sensor, which does not read below 945C (1733F)
    2. 500C, from calculated EGT, which is derived from load/RPM

O2 sensor

  • Narrow band sensor - only accurate near stoichiometric A/F. Only good for closed loop.
  • Wideband sensor - accurate everywhere! Great for tuning open loop.

Timing and Knock control

  • Relationship between KVs and timing correction factor
    • Direct?
    • Filtered/corrected somehow?
    • Are logged KV's corrected?
  • Relationship between IATs and timing maps

Characteristic curve

  • When is it consulted?
    • During both open/closed loop?
  • Is MAP used?
  • What if ECU detects broken/unplugged MAP?

Synchronous path/Asynchronous path

  • Synchronous path outputs: VVT, ignition timing, injector pulse width
  • Asychronous path outputs: requested boost, throttle plate angle

Variable valve timing

F-hose

  • Why does it exist?
  • Delete howto

Manual boost controller

  • Parallel vs series vs alone
  • Tuning
  • Relation to throttle cut and TCD

Throttle cut defender

N75, N249, Wastegate

  • N75 controls wastegate
    • how is req. boost related to waste gate duty?
    • why delete? (to use MBC, AVCR etc)
  • N249 controls BPV
    • why delete? (no conclusive proof of any advantages)

RNS-E Nav information