2020 HPP, OAR too low & 1 knock always shows on cylinder 2

[JJSSI]

I didn’t log anything until I had driven 1600 miles. The car has the stock tune.
The OAR was 0 even though it was always filled with Shell 93 octane.

I drove the car until it was below ¼ tank and filled up at another station. The OAR then went to -0.26.
At ½ tank I added 2.5 gal of Sunoco 100 octane, which if the remaining fuel was 91 Octane, then it should now be 93.25 octane.
I drove until the car registered empty and the OAR was still at -0.26.

I added 4 gal of Sunoco 100 octane and left to go to another Shell station on the interstate. Within 3 miles the OAR moved up to -0.33.

I filled the rest of the way up with Shell 93 so now my octane should be 94.2.

Since the fill-up I have driven 175 miles (now at 2400 total) and the OAR has remained at -0.33.

The knock control spark adjustment varies from 0 to -2. No DTC error codes.

The other strange thing is that cylinder 2 always shows a knock of 1 even before the car is started. The other cylinders always show a count of 0.

So, does anyone have any ideas?

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[tfribourg]

So my HPP had a lot of knock before i changed out the spark plugs to the NGK ones everyone uses. Currently running stage 1 cobb tune

The KOM (same as OAR) has never not been 1 on mine

Are you running any sort of tune? How does it drive? Even if stock it may benefit you to change out the plugs.

What does your ignition correction look like? Do a log and track that

 

[JJSSI]

What is the best KOM you have had?

No tune.
There is no audible knock. Cylinder 1,3&4 show 0 knock count. Cylinder 2 shows 1 count even before the engine is started.
knock control spark adjustment is 0 to -2 (adding adv).
Car seems to run fine.
Log is after the text.

Thanks for the reply

 

[tfribourg]

Ok so my KOM has been at +1 consistently, it's just inverse of OAR.

I'd def check the spark plugs condition/gap, compare #2 to the rest of them. Maybe rotate them around see if the knock moves with the plug.

Have you looked into getting an accessport / pro tune? They could tell you exactly what is going on. My car feels way better since i got the stage 1 and swapped plugs.

Side note- How do you like the handling package / magnaride? literally couldn't find one available near me it was dissappointing

 

[JJSSI]

I don't believe the #2 knock count is correct because the car must be running to detect knock and it shows 1 before the car is started. The other 3 show 0 before starting.
I want to keep the warranty for a while so no tune.
When I get to empty I think I will drive for a while on 100 octane and see what it does.

The handling package and MagneRide make a big difference. The MagneRide does a great job adjusting to different conditions. I was lazy and decided not to change out the suspension this time myself, so I went with the handling package. I have not had a chance to "really" try it out yet as the roads in coastal Georgia are not as fun as in the mountains. I couldn't find what I wanted so I ordered mine.

 

[ice445]

You should be at -1 or close, sounds like #2 is bringing down the average. I agree with looking at the plug to try and figure out what's going on. Or just straight swap with a new OEM one.

 

[JJSSI]

I will try changing the plug. Cheap and easy.
I think it would be strange that a plug could affect the knock count without starting the car.

 

[JJSSI]

I did swap plugs in #2 and #1 but nothing changed. They looked good and the gap was correct.

So it appears that the Cylinder Knock/Combustion Performance Counter doesn’t work like I thought it did.

This is what ForScan says:

”Cylinder Knock/Combustion Performance Counter.
Counter for the cumulative number of ignition events with abnormal knock/combustion detected. This typically resets when the DTC’s are reset by the service tool.”

So that would mean there was one ignition event with abnormal knock/combustion that occurred and was recorded several months ago. I don’t think that is affecting the OAR/KOM number.

I used the ForScan clear DTC but the counter number still remains. Looks like it may take a service tool to get rid of it. Any way I think I will leave that off my data logs.

When I hit empty, I will fill it with 100 octane and see what happens.

 

[GuardEcoBeast]

Dont run shell gas, its awful for turbo cars.

 

[Cmw458]

I've heard that before with our cars that shell isn't good.

Never know who to trust though. 93 wise all I have around here is sunoco exxon ammoco and then your convenience store brands... Getgo Sheetz speedway etc.

 

[JJSSI]

I have already decided not to use Shell.
Thanks

 

[speedfrk]

Does FP have a tune specific to the HPP cars yet?

 

[JJSSI]

No they don't.

 

[karter8]

No they don't.

Speedway is Top Tier and works well for me.

 

[JJSSI]

Speedway is Top Tier and works well for me.

Thanks, there aren't any close to me but there are some in Jacksonville and I'm down that way occasionally.
Do you race Karts?

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