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Calling all the gurus to please take a look at my timing map and help me why I'm seeing 4ish counts of knock at higher RPM w/ pretty conservative timing.
Fueling - 93 octane
Targeting 26 psi, but this knock has happened with only 23-24 PSI.
Fueling is dialed in and have experienced the knock with AFR at 11.4 and also with it as rich as 10.9. Richening it up didn't seem to help much.
Knock sensor sensitivity has also been adjusted in an attempt to get rid of this. Since knock ADC didn't cross knock BASE, I thought it may be phantom knock, but its already up to 26 on the HIGH setting for my knock sensitivity. I didn't really want to go higher.
I've done a ton of research about timing, and the general consensus is most evos can do 3-4 degrees at peak torque and hit low teens at 8k... anything different for my gsc s3 cams? I'm only at 24-25 psi. I estimated that peak torque should be around 4500-5500?
Can someone chime in about my timing map or suggest what to do?
**not sure if it matters, but i have my Kpa to load set 1:1 ... (500 kpa = 500 load) see last pic.
Sorry, I guess my megalog viewer didn't show RPM.... I am seeing it in higher RPM... Here is an example of getting 3-4 counts at 6300 + RPM @ 270 Kpa (25 PSI)
Knock ADC does not cross Knock Base - and I don't see any crazy spikes, but I also know that ADC can be logged so fast, there's a chance one of the samples missed... I am logging at 5-6 items per second.
Attached are the log and a screenshot. It's worth noting my High RPM knock multiplier is set at 25 (stock is 20), so about 20 percent over that
I'd be pretty confident that Knock ADC has been crossing knock base. I bet you would see it cross if you logged via DMA. I did this a while back and the knock count did accurately reflect the number of crosses. I won't comment on the cause of the knock for you, though. In my case, mine was phantom knock (I think it was caused by the ACD relay ticking on and off during light acceleration around 2500-3000 RPM).
There are two things which you might look into,
- A metal to metal contact somewhere in the car.
-Although you have high flow CAT and O2 dump but their might be some backpressure which can cause this also.
There are two things which you might look into,
- A metal to metal contact somewhere in the car.
-Although you have high flow CAT and O2 dump but their might be some backpressure which can cause this also.
You need to read the plugs as well.
I think the cams are just noisy with the 5041 beehives, or the knock sensor is just sensitive? I ended up tuning with e85, and I was even getting some knock at only 7-9 * of timing @ 6800-7000 RPM on e85.
So this leads me to conclude the knock sensor is either loose or bad. I will be swapping in a new one once I put the new intake manifold on
Sep 10, 2023, 05:27 PM
