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threepedals threepedals is offline
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Default Just installed JB4 on Veloster N, please examine first log - 06-01-2021, 01:18 AM

I'm a log-reading newb, please examine and let me know if there's anything concerning here. Thanks!

2021 Veloster N 6-speed
HKS M45XL Spark Plugs gapped .022, no other performance mods yet
93 octane pump gas
MAP2 3rd gear
planning firmware update soon
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File Type: csv P21_M2_R1_mtswithfrank_210531_151519.csv (9.6 KB, 34 views)

Last edited by threepedals; 06-01-2021 at 01:19 AM.. Reason: added csv file
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Default 06-01-2021, 09:10 AM

Looks fine so far to me!


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threepedals threepedals is offline
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Default 06-01-2021, 09:25 AM

Thanks Terry!!! I really appreciate you checking it for me.
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Default 06-20-2021, 08:53 AM

I finally hooked up the fuel control wire on my Veloster N and got another log(attached).
Comparing to the first log I posted (above) AFR doesn't look any different but trim does. Can someone explain that please?
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File Type: csv P21_M2_R1_afterfuelline_210619_174047.csv (11.3 KB, 15 views)
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Default 06-20-2021, 10:36 AM

You got some crappy corrections on this log.
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threepedals threepedals is offline
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Default 06-21-2021, 02:31 AM

"Crappy corrections". Can you talk me through that a little bit? I assume you are talking about the ignition timing in the 0 - 4200 range?

What do I do about it? Should I remove the fuel wire? Terry said my first log (see above) looked OK, that was without the fuel wire.
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Default 06-21-2021, 10:42 AM

You're pulling up to 4.5 degrees of timing...more octane usually resolves that.



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threepedals threepedals is offline
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Default 06-21-2021, 12:13 PM

The car seemed OK on 93 until I connected the JB4 fuel wire. It makes less power and runs worse now. I'm kinda disappointed.

I have no plans to run octane boost or race gas so I guess I'll just disconnect the fuel wire. I really just want to get the most out of this JB4 on pump gas.

Last edited by threepedals; 06-21-2021 at 12:15 PM.. Reason: .
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Jaybone Jaybone is offline
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Default 06-21-2021, 01:31 PM

Your not making less power your showing more boost. Try a reset disconnect the negative on the battery terminal wait 5 min and reconnect and re log. Then just keep an eye on it for awhile (re log in a couple days)


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threepedals threepedals is offline
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Default 06-22-2021, 02:53 AM

True, it shows a bit more boost but timing is down by 4.5 degrees and I can easily feel the power loss. If I enable bit 0, it feels noticeably better and the timing comes back up.

I had disconnected the battery when I connected the fuel wire. So I guess I'll just drive it a little more and get another log as you suggested.

Thanks everyone for your feedback, I do appreciate it!
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Default 06-24-2021, 04:59 AM

I have driven the car a little more, and have taken more logs. Here's graphs for ease of comparison, I can also provide full logs.
First, here is comparison between fuel wire connected and no fuel wire connected:
levels and timing back up.
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Default 06-24-2021, 05:00 AM

Here are two more pulls, one in 3rd and one including 1st,2nd,3rd gear. Each of these graphs is on the same 93 octane pump gas, no fill-ups in between.

Looks dramatically different all of a sudden. Is this thing learning or is there some other explanation?

The 3rd gear pull shows increased boost over no-fuel wire condition and better timing than the first graph above.
The 1-2-3 pull shows boost back down to no-fuel wire levels and timing back up.
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