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Data Log - Looks to be a problem

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Data Log - Looks to be a problem

Post by Corepuncher on 11/25/2011, 2:03 pm

Did a WOT run and datalogged it. Here is a chart below. Look at Bank1 vs. Bank2. I talked briefly with Van about this. Bank1 around 0.789 is correct during the big WOT's...but look how my bank 2 will shoot up to 1.6 during the same time. Van said I should replace all my spark plugs and gap at 0.032. They are brand new plugs, but I guess there could be a bad one. He said do that first, if not that, then it could be a vacuum leak or something and I'd have to do a smoke test.

I need a tutorial on this. Is bank 1 and bank 2 referring to the 4 per side on the engine?

Go here to view it: http://www.corepuncher.com/Parts/log1.png

As you can see, bank1 afr drops down low during big WOT / RPM ramps ups...and rises spikes up when I am shifting (and letting off gas). But for Bank 2, it spikes up IN THE MIDDLE of the WOTS...that is the problem from what I can tell.
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Re: Data Log - Looks to be a problem

Post by 07Shelby500 on 11/25/2011, 2:33 pm

You need to get it on a Dyno.

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Re: Data Log - Looks to be a problem

Post by Shelby10' on 11/25/2011, 3:13 pm

+1 for a dyno. Need to check the tune/afr on a loaded dyno with an accurate Air Fuel sensor. You can also datalog during the dyno for your benefit

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Re: Data Log - Looks to be a problem

Post by Corepuncher on 11/25/2011, 3:17 pm

I would be open to doing this but I don't want to drive to Tulsa to do it. I'll have to check around the OKC area, surely someone has one.
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Re: Data Log - Looks to be a problem

Post by Shelby10' on 11/25/2011, 3:20 pm

If you do want to stay local, then make sure the dyno you are using has an ACCURATE A/F sensor. A lot of Dynos just stick a sniffer in the tailpipe and/or are using a junky meter, which is FAR from accurate. It can be a full point off...then your adjusting the tune off of an inaccurate reading and possibly risking the motor.

Kurtis has an AFM1000 A/F sensor, which is the ONLY aftermarket A/F sensor Kenne Bell trusts when you are questioning their tune if that tells you something.

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Re: Data Log - Looks to be a problem

Post by Corepuncher on 11/26/2011, 11:06 am

I think the problem is fixed...thanks to Van's advice. He said to change out all my plugs (which were BRAND NEW BTW) and gap them at 0.032".

I already had gapped them to about that range I had thought, but maybe one was bad. So I removed all the old plugs and also tested the gap. most were right at 0.035...but one was 0.040. That subtle difference, apparently, makes a world of difference when you are talking about high RPM's.

So, I spend a long time with the new plugs, gapping, and regapping, and re re gapping until I thought they were all equal and perfect. Hard to do as sometimes the plugs can "stick" to the gapper if there is a sharp corner.

Put them all in, and did another run. Looks much better. Amazing how such a little thing can make a big difference.
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Re: Data Log - Looks to be a problem

Post by BASixxer on 11/26/2011, 6:30 pm

Hope that fixed the issue. Do you know which cylinder the bad plug was on?
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Re: Data Log - Looks to be a problem

Post by Corepuncher on 11/26/2011, 9:56 pm

No Lee I do not know. Van said the custom is to just replace them all, so I did. It might have been something as simple as mixed gaps, but not sure. I'm glad I didn't have to go looking for some vacuum leak!

Hey let me know when you have those prices for carbon fiber parts, I'm still interested.
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Re: Data Log - Looks to be a problem

Post by Evenflow Solutions on 11/26/2011, 10:58 pm

Not to be a downer but plug gap .035-.032 will yield little to no difference at boost levels lower than 20 psi. When you gain some miles on the new plug set re-log and post the graph please.

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Re: Data Log - Looks to be a problem

Post by BASixxer on 11/27/2011, 12:34 am

If one wasnt seated he could have been losing compression. May not necessarily be the gap that caused the issue on its own.

But yea, wait a week and datalog again.
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Re: Data Log - Looks to be a problem

Post by Corepuncher on 11/27/2011, 10:37 am

One of them was 0.040.
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