My evo ix knock sum ok?
Originally Posted by P_Tune_C
The datalog was done in 3rd gear. Stock 05 turbo. this knock shows up only during night time for odd reason. on daytime it's fine. Also this is with 100 octane race gas.
Originally Posted by l2r99gst
nj1266,
I have seen you make this statement countless times. Just because you see an increase in ignition advance, it doesn't mean the ECU isn't pulling timing.
The ECU is still going to follow your timing profile based on your ignition maps and what RPM/load you are at. It's just that the the ECU will subtract timing from the value that it should be.
For a quick and completely arbitrary example, let's say that your timing should ramp up like this from peak torque:
3 5 8 10 14 18 (completely arbitrary just to prove a point)
Let's say that you get 6 counts of knock where the 14 and 18 were. Then your timing will look something like:
3 5 8 10 12 16
Of course the ECU will still advance timing. It will just apply the knock correction to it. I just keep seeing you say that you see the ECU ADD timing when there are knock counts. Sure....it is just following the timing maps and correcting as needed.
Eric
I have seen you make this statement countless times. Just because you see an increase in ignition advance, it doesn't mean the ECU isn't pulling timing.
The ECU is still going to follow your timing profile based on your ignition maps and what RPM/load you are at. It's just that the the ECU will subtract timing from the value that it should be.
For a quick and completely arbitrary example, let's say that your timing should ramp up like this from peak torque:
3 5 8 10 14 18 (completely arbitrary just to prove a point)
Let's say that you get 6 counts of knock where the 14 and 18 were. Then your timing will look something like:
3 5 8 10 12 16
Of course the ECU will still advance timing. It will just apply the knock correction to it. I just keep seeing you say that you see the ECU ADD timing when there are knock counts. Sure....it is just following the timing maps and correcting as needed.
Eric
Originally Posted by nj1266
+1 I have little faith in any electrical knock reading device. The more I read about knock, especially on the innovate forums, the more I believe that a well designed hearing aid with a head set will be the best way to go in detecting knock.
For fun, I have hooked up a wire from pin 78 on my ECU to my Innovate logging system. I will log the knock voltage and compare the changes to timing changes. My hypothesis is that increased voltage from the knock sensor pin will not overlap with pulled timing. We will see.
For fun, I have hooked up a wire from pin 78 on my ECU to my Innovate logging system. I will log the knock voltage and compare the changes to timing changes. My hypothesis is that increased voltage from the knock sensor pin will not overlap with pulled timing. We will see.
l8r)
Originally Posted by Ludikraut
If you want to tap into the knock circuit, then you should do so using a knock buffer (like the Chip Torque knock buffer from Vishnu). IIRC, just hooking up a wire to log the signal can change the signal enough to impact the ECU's ability to determine knock.
l8r)
l8r)
The voltage was all over the place. I guess I need to spring for the knock buffer 
Originally Posted by DynoFlash
That is odd as I log knock voltage in all my custom tuning - just as the AEM logs the knock voltage it is a 0 -5 volt signal
The log I get is all over the place the voltage just spikes up and down with little to no meaning. The only time I can make sense of the voltage log is when I set the smoothing to max on that channel. Do you smooht the knock volt channel?
Maybe I am tapping into the wrong pin. What is the color of the wire that goes into pin 78?
Last edited by nj1266; Jul 17, 2006 at 08:49 PM.
Originally Posted by Ludikraut
If you want to tap into the knock circuit, then you should do so using a knock buffer (like the Chip Torque knock buffer from Vishnu). IIRC, just hooking up a wire to log the signal can change the signal enough to impact the ECU's ability to determine knock.
l8r)
l8r)
However, I have seen other people's work (doing crazy things with the innovate aux box) and subsequently had to repair their wiring and all I have to say is proceed with caution.
On the EVO I've tapped the knock sensor wire using my innovative LMA-2 and was able to see voltage spikes that coinsided with timing being pulled as shown on my pocketlogger. This was a couple of years ago when I was using an AFC to tune. I've read some posts on the innovative forums about how you shouldn't interrupt the sensors signal so I stopped using that method. I did however work well for me.
Originally Posted by jcsbanks
Input impedance appears to be 1MOhm on the LMA-3. Surely that wouldn't need any more buffering?
Just know that on the particular car that I repaired the wiring had the injectors tapped for duty cycle...
When that car was running with the AUX box wired in that way, he ended up with cracked ringlands, and is now on its second engine. not sure if that is what caused it for a fact, but to me that is highly suspect.
Originally Posted by JeffR116
I was tuned on 92 with 8 degrees of timing and was knocking like a motherf*cker with 94 octane. I had to pull 2 degrees to cut it down. It was ridiculous.
Couple of quick observations:
1. The AEM does have knock control that utilizes the factory knock sensor and can thus be every bit as good or bad as the factory knock control.
2. Because EvoScan says it is so, does not necessarily make it so.
3. I have also been advised against tapping directly into the knock sensor wiring for logging voltage without a buffer. The AEM isn't tapping into the wiring - it's taking the signal directly from the knock sensor via the factory wiring harness. Hopefully someone with a little better understanding of the magic of electricity can expand on that.
1. The AEM does have knock control that utilizes the factory knock sensor and can thus be every bit as good or bad as the factory knock control.
2. Because EvoScan says it is so, does not necessarily make it so.
3. I have also been advised against tapping directly into the knock sensor wiring for logging voltage without a buffer. The AEM isn't tapping into the wiring - it's taking the signal directly from the knock sensor via the factory wiring harness. Hopefully someone with a little better understanding of the magic of electricity can expand on that.