General Weird issue with GVR4

[BagelBoy]

So got a weird issue going on that I figured the wizards here might know. I recently swapped my fuel lines to -6an PTFE fuel lines, and installed a new DW fuel filter 10 micron and its size is 110mm with -6an fittings. I also installed the -6 an bulkhead fitting from STM at the hanger so its all ready for my future e85 swap.

Now I get a weird stutter in 5th gear where its cutting in and out before 3.5k rpm and I get a lot more knock throughout the gears.

I verified my spark gap on 7es at .028, compression test is 140 across, BLT was fine at 30psi, base timing was still good at 5 degrees, and my AFPR is holding at 43.5 with vacuum off. I didn't have this issue before swapping (I had a very slight knock but it was ok at 2 degrees full WOT around 7.2k rpm) but now it fills up to around 5-9 degrees knock on ECMLink.

Basically I am stumped on what else to go through and was hoping if anyone here had some directions for me to go. I believe its fuel related but I am really stumped as it shouldn't have affected my setup that drastically and everything isn't leaking and my pump seems to be fine still. Thank you guys!

 

[dwb]

Can you share a log? I'm curious what DSMLink is set to for base FP.

 

[BagelBoy]

I don't have the fuel pressure set on ECMLink yet was planning on getting that wired in soon but I have it running on my gauge pod and it says 43.5psi at idle. I can post a log of what its been doing though.

 

[dwb]

I'm definitely no tuner, but shouldn't this be 43.5psi to match your AFPR? I had some odd knocking too and discovered my base FP was slightly higher than this setting. Dropping my base FP to match the global fuel adjustment helped reduce the knock count.

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[BagelBoy]

Sorry I think that was right before I set it to 43.5, that log was when I had it set to 37psi on both but otherwise nothing changed from it.

 

[BagelBoy]

Actually I just opened it and it says its 43.5psi. Im not sure why it says that on your end but here is what it said when I openned that log.

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[dwb]

Those definitely weren't my settings but it still has the same global fuel and deadtime due to different injector sizes. Speaking of injectors, what are you running?

 

[BagelBoy]

RC1200c Low Z

 

[steve]

DSMLink defaults to what was the base fuel pressure for the generation of the ECU. (I don't think it knows about 1G ATX's) You have to change the value for the computation if you are running something else. The only thing it changes is the value for the fuel global it outputs. If you forget and use that value in the global setting your global will be off.

(I don't remember if it saves what you entered on your laptop but sharing the log doesn't seem to include it.)

 

[DSMPT]

To me, it seems like you are overcooling the cylinder head for some reason or you have a bad coolant temp sensor or bad circuit/wirings. So maybe ECU is detecting rich knock or something related to the coolant temp.
All WOT part, the coolant temp is around 75 degree C which looks too low to me, fuel don't get burnt well in combustion chamber. And you have some sudden coolant temp drop to 47 degree C at the point where the knock retard started. And you also have another sudden coolant temp drop in another WOT, and the knock retard started at the same moment.
I would check for this first.

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[BagelBoy]

To me, it seems like you are overcooling the cylinder head for some reason or you have a bad coolant temp sensor or bad circuit/wirings. So maybe ECU is detecting rich knock or something related to the coolant temp.
All WOT part, the coolant temp is around 75 degree C which looks too low to me, fuel don't get burnt well in combustion chamber. And you have some sudden coolant temp drop to 47 degree C at the point where the knock retard started. And you also have another sudden coolant temp drop in another WOT, and the knock retard started at the same moment.
I would check for this first.

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I did not notice that thank you! Im definitely going to check that out because I looked at the connector and its a little messed up so hopefully that fixes the issue.