FIC to log knock.. THEORY.. Test tommrow
12-17-2009, 10:42 AM
#23
12-17-2009, 03:36 PM
#25
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well this is how your aem ems works.. Logs voltage as a form of knock. So technically this should work the same..
I have the 05-06 knock sensor wire color..
Anyone have the 07+ knock sensor wire color?
12-17-2009, 03:36 PM
#26
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12-17-2009, 04:00 PM
#27
Kind of like the theory that the 08+ xB should use all of the tC turbo kits parts and such, but even that has a twist due to chassis changes. Ya know Mike?
12-17-2009, 04:04 PM
#28
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Yes in theory a lot of things work, but practicality is a different story. The EMS is a much more sophisticated piece with much more logic for control over the FIC and datalogging capabilities as well. In theory, your premise should work, but only time will tell.
Kind of like the theory that the 08+ xB should use all of the tC turbo kits parts and such, but even that has a twist due to chassis changes. Ya know Mike?
Kind of like the theory that the 08+ xB should use all of the tC turbo kits parts and such, but even that has a twist due to chassis changes. Ya know Mike?
true.. I will find out tonight.. Do you have the wire color for knock sensor 07+ ?
12-17-2009, 04:07 PM
#29
Also, don't forget that the EMS can datalog up to 250 samples/sec on the internal logger for ultimate granularity and true knock sensor capability. The FIC can only datalog as fast as the PC it's connected to. So transient throttle quick dets can be hard to spot with certain computers.
Let's also mention the fact that knock voltage is not universal all accross the board. One engine may make more "engine noise" than other due to setup, size of the turbo etc which may need more or less filtering on a knock signal than another engine.
The knock voltage curve in the EMS is to be established running conservative no-knock timing and a decenltly safe AFR for the fuel used and setup, a complete RPM run should occur with full throttle and the knock sensor should be logged. Once it's logged with a positive ascertian that no knock occured, a knock curve can be made based off of the datalog of the knock sensor's voltage.
Let's also mention the fact that knock voltage is not universal all accross the board. One engine may make more "engine noise" than other due to setup, size of the turbo etc which may need more or less filtering on a knock signal than another engine.
The knock voltage curve in the EMS is to be established running conservative no-knock timing and a decenltly safe AFR for the fuel used and setup, a complete RPM run should occur with full throttle and the knock sensor should be logged. Once it's logged with a positive ascertian that no knock occured, a knock curve can be made based off of the datalog of the knock sensor's voltage.
12-17-2009, 04:10 PM
#31
HINT:
• The wavelength becomes shorter as the engine rpm
increases.
• The waveforms and amplitudes displayed differ
slightly depending on the vehicle.
12-17-2009, 08:36 PM
#32
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Sounds like a great idea, but I don't believe you can tap a sensor that easily. I know we can't in the HVAC world. I think you would need to wire the sensor into a separate analog input, map it to an output and then wire to the factory harness? Does the FIC have outputs?
12-25-2009, 12:23 AM
#36
