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Old Jul 10, 2007 | 02:14 PM
  #31  
Mark S's Avatar
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Its not quite as easy as that as the sensor will operate on a very narrow feq/noise band so you may not be able to sort on a stock ecu where you maybe able to adjust it on a programeble ecu,
Ion sensing looks interesting but we wont know what is realy like until it becomes wide spread.

Mark
Old Jul 10, 2007 | 02:16 PM
  #32  
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Originally Posted by Ted B
Thanks, the good info is appreciated. I'm very curious at this point, especially if the results from comparing audible vs. factory ECU knock detection are useful enough to use the audible method to program the KS noise floor settings for an aftermarket ECU.
Ted do you have a programable Ecu to be able to induce some dett to be able to compare you findings, If so I would induce a small amount of dett over 1 point in the load/rpm table so it goes through it and wont do any damage if done carefully.

Mark
Old Jul 10, 2007 | 03:29 PM
  #33  
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Yes, and that's more or less what I intend to do. I'll reduce boost pressure to where the motor isn't making much power (don't want to break anything), and gradually induce it somewhere in the meat of the torque curve and 'get my ears tuned' that way.
Old Jul 11, 2007 | 12:03 AM
  #34  
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I would love to hear DB's .02 on this subject. Most of his high hp street cars are 2.3L and they all make lots of hp. I'm not sure how much timing he runs with his strokers but it would be interesting to hear how he adjusts the knock on the AEM. I do know that his torque curves are flatter than any others that I have seen.
Old Jul 11, 2007 | 08:39 AM
  #35  
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Im really interested as well. To finding a fix ( in other words having the knock readings being accurate to take full advantage of an AEM EMS with the knock control options.) So even if a car is tuned with head phones (lets say for a glory run) when conditions change or bad gas everything will still be controlled ( as much as possible to save the engine. Especially when in the 500-700 hp range)

The ion sensing is interesting but i would guess it would be rather expensive right now until its more widely used and eventually become cheaper and/or implemented into factory cars.
Old Jul 14, 2007 | 03:06 PM
  #36  
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Ted b

Have you tried this yet.

Mark
Old Jul 14, 2007 | 07:02 PM
  #37  
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From: Philly (Bucks Cty.)
Originally Posted by Jean
The ion sensing is interesting but i would guess it would be rather expensive right now until its more widely used and eventually become cheaper and/or implemented into factory cars.
I had never heard of ion sensing until scanning this thread, but after digging around a bit.....It seems that it IS already used in production applications. Isuzu Rodeo's (of all things - which used a Delphi-developed system), the new E60 BMW M5, and Harleys are using it. Probably I could find more if I looked harder.

Maybe part of a Delphi system could be adapted...you'd have to post-process the ion current supplied by the coil module to detect the knock and feed that information to the ECU in the form it's looking for. Maybe by simulating the frequencies that the knock algorithm is looking for so that it starts pulling timing.

Hmmmmm...
Old Jul 15, 2007 | 06:39 AM
  #38  
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Originally Posted by Mark S
Ted b

Have you tried this yet.

Mark
No, I am beginning the arduous process of piecing together and installing a new engine, clutch, and gearbox, so it will be a little while until I get into the tuning phase. I will report back however when I do. I'm looking forward to it.
Old Jul 15, 2007 | 09:26 AM
  #39  
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If one were to retrofit ion-sensing hardware to the Evo, a Saab would be a fine place to start since they've had by far the most experience with it.

Saab was the first to apply ion sensing knock detection to roadgoing vehicles. Introduced it in the early '90s.
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