First log with JB4 installed

[22WhiteStinger]

Can someone review the attached log and let me know what you see.

Visual graph

 

[22WhiteStinger]

Well after more researching I found information that says ign1 is true timing and all other cylinders are logging adjustments. I have a lot of adjustments high end

 

[Thomby]

Ign1 is your base/absolute timing advance: 10 means 10 degrees BTDC. Ign2-6 are individual cylinder corrections: so 3 would mean (10-3) degrees in that cylinder.

In your log, you just have a couple quick WOT bursts with closed throttle between, but you can see Ign1 increase from 8-9 to around 14 through the rev range. If you did a longer pull through a few gears, say 20-80mph, your chart would show it climb through the rev range and drop after each shift.

Rule of thumb for corrections is that 3+ degrees means knock. So all those 2.3s aren't a big deal, but the 3.8s, 4.5s, and 6.8s may mean you're octane limited. Here's a writeup I did with some more info, and the link to BMS's parameter definitions:

T

Post in thread 'Wondering if anyone could let me know if I am running at a safe level I have no idea. What my air fuel ratio should be. Please help someone.'

Mar 21, 2023

I’ve had my JB4 for a while now just installing it what a difference it makes I’m only a little concerned that I am not really able to read the logs do you know if I am running in a safe range love how fast it is but I really don’t want to hurt my car

I'm still an amateur at this, but here's BMS's guide, and how I'm learning to look at these:

JB4 Logging Parameters - JB4tech.com - International Turbo Tuning Discussion

Hey guys, We’ll use this thread for details and discussions on Kia specific JB4 logging parameters. Fuel trims and wideband o2 sensor control explained here...

www.jb4tech.com

I start by looking at Pedal, Gear, and MPH (light orange) to get my bearings...

• Thomby

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[22WhiteStinger]

Thank you. I definitely was misreading the log. Also it was hard to find an area to do a full pull. I will try to get better data tomorrow.

 

[22WhiteStinger]

New WOT log. I think it got worse for timing retard.

 

[Thomby]

Yeah base timing, trims, AFR, and fuel pressure all look good, but those 4.5, 5.3, 6.8, 8.3 corrections in most cylinders aren't good.

I do see your ECU calling for as much as 15.1 psi, which I think is on the high end of stock (it's load based, but I'm used to seeing ~12psi in winter, ~14psi summer, and your IATs aren't crazy high at 87 degrees).

What kind of fuel are you running? If it's some kind of crappy California 91, and your total boost is closer to what's typical for Map 2, that might explain things. Can you try another brand of gas, ideally 93?

 

[22WhiteStinger]

I'm running the highest octane available which is 91. Unfortunately in my area theres nothing higher.

 

[22WhiteStinger]

I am going to pull the spark plugs this afternoon and verify they are still good and gapped correctly. I got advice they might be the culprit.

 

[22WhiteStinger]

Spark plugs were fine. I'm going to add octane booster to see if it's the fuel.

 

[Thomby]

Spark plugs were fine. I'm going to add octane booster to see if it's the fuel.

On the next fillup, try a different brand/station. I'm generally skeptical of the "bad batch of gas" theories, but if nothing else it'll eliminate that as a variable.

 

[22WhiteStinger]

On the next fillup, try a different brand/station. I'm generally skeptical of the "bad batch of gas" theories, but if nothing else it'll eliminate that as a variable.

I also don't believe those theories however I do know mistakes happen and the truckers aren't perfect. They have no idea they could cost someone an engine lol.

On the bright side I did find something! On the suggestion of another member I checked my jb4 firmware and it wasn't up to date. I have now updated it. I am extremely hopeful this could be adding to the issue.