Duramax Diesels Forum Truck of the Week
  #646  
Old 10-10-2018, 04:15 AM
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Default Baller!!!

I wish I could but its not in the cards. You don't want them turbo's they are missing some blades and are a little out of balance now. LOL
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  #647  
Old 10-10-2018, 05:51 AM
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Ah I forgot about that.. Can I interest you in a nice pr of 61's then..
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  #648  
Old 10-10-2018, 07:49 PM
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Ok so ya wanted to hear them scream ya say??

Sorry for shaky video, but had phone in one hand, other hand plugging both ears...

https://youtu.be/-QouA9oaOnQ
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  #649  
Old 10-11-2018, 05:33 AM
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Heck yeah! Looks like those LBZ tips cleaned it up nicely too.

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  #650  
Old 10-11-2018, 05:54 AM
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  #651  
Old 10-11-2018, 06:54 AM
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What were the egts on that run? Was sounding healthy.

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  #652  
Old 10-11-2018, 02:42 PM
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Nice!
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  #653  
Old 10-11-2018, 03:12 PM
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How much horsepower were you putting out in that video?
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  #654  
Old 10-11-2018, 03:30 PM
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  #655  
Old 10-11-2018, 08:10 PM
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That last video was holding at like 620hp and 1100F EGT. Everything was really happy and clean there, but turbos were only making 26psi running on single scroll.

Today we added some fuel and couple more deg trimming. Boost came up to 34psi, EGT to 1400F and power jumped to 680hp in that 32-3600rpm range. Drive pressure was in the 50's now, with compressors running at 440F. However we ran into issue with missfires around 3600 yesterday under load. Seems to be dyno / harmonics related, so we tried several thing including changing driveshaft today. Made things worse...

Was able to make some good long pulls today at 3200-3400, but moment we tried to push past that she just stared breaking up. Cylinder probe showed it's shutting off the fuel when that happens. I even put a scope on the crank/cam sensors to try a get a grasp on the issue. Shows pickups are taking errors.

So now we have dilemma, what to do next. Need to open up these turbos again and see how they act above the 4000R level with both scrolls flowing. Thinking they might push on up if we can lay the fuel to em. However, not if she missfires like today and bounces the dyno cart off the ground....
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  #656  
Old 10-11-2018, 08:30 PM
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Any idea's??

First pic is clean crank [red] cam [orange] pattern at 2500rpm. Second pic shows the pulses at 3600 when she starts breaking up.
Attached Images
File Type: jpg 2500rpm-clean.jpg (81.7 KB, 38 views)
File Type: jpg Misfire.jpg (72.2 KB, 35 views)
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  #657  
Old 10-11-2018, 10:31 PM
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Can you get a capture on an analog scope?

Does it happen any time above 3600 RPM, or just under load? If only under load, maybe the front of the crank is walking around and the sensor is getting out of range. Though that doesn't explain the cam signal going out too. That looks like EMI. Which is why I would be interested in those same 2 captures on an analog scope.

How is the engine block grounded? Can you attach the engine block to building ground? And check overall resistance between the ECU grounds and the block.

If you have more than 2 channels on the analog scope, maybe throw one across the block ground to sensor ground. Those should stay very close...

Are the crank and cam signals still twisted pairs with a drain wire/shield?

Just throwing out ideas, I've never seen this before myself.

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  #658  
Old 10-12-2018, 04:29 AM
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Check ground for stray voltage, looks like you have a leak.
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  #659  
Old 10-12-2018, 06:30 AM
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Pretty much only does it once load applied above 3600. But ECM is tracking cyl misfires at idle now after changing driveshaft. So that's weird.

I was thinking a analog scope also. I'll check voltages on everything too. My little $35 digital setup won't give me voltages on those patterns.
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  #660  
Old 10-12-2018, 08:39 PM
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Well after a couple hours of messing around and testing everything electrical, Mark and I took a new approach towards this misfire situation...

https://youtu.be/A6zqu_9Sb7w

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