Knock on e85 not a problem?

[slicktop]

Originally Posted by Frostyman

No, knock is fuel detonating when it shouldn't be. No aluminum is slamming into other aluminum.

educate yourself before speaking next time.
Engine knocking - Wikipedia, the free encyclopedia

Thanks for the lesson, I was misinformed until I read that.

[Frostyman]

Originally Posted by slicktop

Thanks for the lesson, ****head.

You're welcome.

[King Tut]

I think his tuner is using the Long Term Knock Correction to add in the extra timing for E85. I have never seen a Knock Correction Learn Value that high. What is the IAM on those runs? Does it ever change? I worry that your AFR is off the scale rich for the entire boost pull as well.

[gdrider77]

Originally Posted by King Tut

I think his tuner is using the Long Term Knock Correction to add in the extra timing for E85. I have never seen a Knock Correction Learn Value that high. What is the IAM on those runs? Does it ever change? I worry that your AFR is off the scale rich for the entire boost pull as well.

What is the IAM ? Don't see that in the logs. Are you referring to the multiplier? It's 1 the whole time. Afr is 12.17 whole time as well

[whitefrs]

Originally Posted by gdrider77

What is the IAM ? Don't see that in the logs. Are you referring to the multiplier? It's 1 the whole time. Afr is 12.17 whole time as well

From what my tuner told me

12.2 is perfect for e85
Maybe @Sportsguy83 can chime in with that


Sent from somewhere

[King Tut]

Originally Posted by whitefrs

From what my tuner told me

12.2 is perfect for e85
Maybe @Sportsguy83 can chime in with that

It isn't 12.2, it is somewhere below that, but the OEM AFR sensor and scaling he is using doesn't allow us to see how low it is going.

[Sportsguy83]

Originally Posted by gdrider77

What is the IAM ? Don't see that in the logs. Are you referring to the multiplier? It's 1 the whole time. Afr is 12.17 whole time as well

Originally Posted by whitefrs

From what my tuner told me

12.2 is perfect for e85
Maybe @Sportsguy83 can chime in with that


Sent from somewhere

Yeah, everything from 10.5-12.5 is good for E85. Being close to 12.5 in E85 is not a problem at all.

Take with grain of salt, this is what I learned through a lot of reading trying to understand why the AFR gauge reads the same for E85 and pump gas even though their stoich points are different.

Edit: Good point by @King Tut yah he would need to scale the OEM AFR differently to be able to read as low as 11.01
@gdrider77 what does your AFR gauge say (if it is a wideband and not an OBDII reading).

[King Tut]

Originally Posted by gdrider77

What is the IAM ? Don't see that in the logs. Are you referring to the multiplier? It's 1 the whole time. Afr is 12.17 whole time as well

Ignition Advance Multiplier (IAM). It sounds like your tuner has defeated the knock control strategy if your IAM is always at 1 while seeing knock.

[jamesm]

Originally Posted by Area86

Here you go.

here it looks like you're running 20% ltft and it's pushing your open loop afr's below 12:1. something isn't right i would think.

edit: just realized you were FI, so < 12:1 afr is good. still why such high ltft on the high range?

[gdrider77]

Originally Posted by King Tut

Ignition Advance Multiplier (IAM). It sounds like your tuner has defeated the knock control strategy if your IAM is always at 1 while seeing knock.

Not sure the "1" i mentioned is right. In ECUtek, logs, where is the IAM reading? I dont see that in my logs? I see something that says "advance multiplier" is that it? I Highlighted it in this image....

[King Tut]

Originally Posted by gdrider77

Not sure the "1" i mentioned is right. In ECUtek, logs, where is the IAM reading? I dont see that in my logs?

It is a parameter that EcuTek added to its logging. I don't remember the exact term for it in EcuTek. I think it is Advance Multiplier or Ignition Multiplier. I believe it gets selected by default, but you might have to click it to have it be logged.

[xjohnx]

Originally Posted by King Tut

It is a parameter that EcuTek added to its logging. I don't remember the exact term for it in EcuTek. I think it is Advance Multiplier or Ignition Multiplier. I believe it gets selected by default, but you might have to click it to have it be logged.

It's advance multiplier, and yes, it's selected by default.

[gdrider77]

Originally Posted by Sportsguy83

@gdrider77 what does your AFR gauge say (if it is a wideband and not an OBDII reading).

Yes, its a wideband.

I will setup a camera to record, hard to watch that while im driving...i will also pull the logs from the aem failsafe and see what it says.

[xjohnx]

Originally Posted by gdrider77

Yes, its a wideband.

I will setup a camera to record, hard to watch that while im driving...i will also pull the logs from the aem failsafe and see what it says.

Probably just easier to pull the AEM logs than try to record it with a camera. The AEM Failsafe logs should show the last 3 hours worth of AFR, RPM and boost (assuming the wires for the last two were connected)