S4wiki:Community Portal: Difference between revisions

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* What determines which is used when?
* 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 + adapt channels + ltfts? (derived from stfts) + stfts?
** closed loop -> base maps + IAT?/EGT? correction + adapt channels + ltfts? (derived from stfts) + stfts?
*** stfts derived from narrow band
*** stfts derived from narrow band
** open loop -> base maps + adapt channels + trims? + load (derived from maf)
** open loop -> base maps + IAT?/EGT correction + adapt channels + trims? + load (derived from maf)
* 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

Revision as of 23:09, 1 September 2006

What is the Community Portal?

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?

Lemmiwinks

  • High EGT and IAT corrections..
    1. is there a flag for each, or is the correction progressive?
    2. does it affect both fueling and timing?
    3. does it affect req boost?
    4. does it affect load calculations?

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)

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


Articles that need content

Open loop/closed loop

  • What determines which is used when?
  • What inputs are used in each to determine fueling
    • closed loop -> base maps + IAT?/EGT? correction + adapt channels + ltfts? (derived from stfts) + stfts?
      • stfts derived from narrow band
    • open loop -> base maps + IAT?/EGT correction + adapt channels + trims? + load (derived from maf)
  • What inputs are used in each to determine boost
  • What inputs are used in each to determine timing
    • base maps + IAT/EGT correction + retard (derived from correction factor)
      • correction factor derived from kvs

O2 sensor

Knock control

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

Characteristic curve

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

Manifold air pressure

Synchronous path/Asyncronous path

F-hose

  • Why does it exist?
  • Delete howto

Master boost controller

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

Throttle cut defender