Did this just start up recently? Any chance you are getting bad / contaminated fuel ?
Did this just start up recently? Any chance you are getting bad / contaminated fuel ?
I have gone through a few tanks of fuel already. Seemed OK for the first 50-100 miles after re-installing the engine and running E10 94 octane on 9 heat range race plugs - until the plugs started to foul. I pretty well drained the tank before pouring in race fuel and installing new plugs as I was preparing for a dyno session that ended up getting cancelled. It idled better with the new plugs, but WOT was still an issue. Drained the race fuel and went back to E10 94 octane - continued to act up after that.
I was told that Bosch sensors will start reading 2.0 AFR units higher than actual if the mixture goes too rich?? I have dual LC1s installed. Not sure if this is correct or based on outdated info but I am not willing to set my commanded AFR in boost to 13.0 to find out. Even if they do tend to do this, is it not corrected by a free air calibration? I didn't think this was an issue as both widebands were reading about the same, other than the rich spikes on 1 side.
2017 Camaro SS, 2014 Ram 2500 4x4 Cummins 6.7L, 2004 Chevy Avalanche Z71 4̶X̶4̶(now 2WD), 5870lb race weight, 10.93@ 124, Twin TVS1900s, Twin Throttle, 429 LSX, 4L80E, custom 14 bolt rear, V2, R̶o̶a̶d̶R̶u̶n̶n̶e̶r̶(dead), COS3......
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Try pulling about 10deg out of your WOT area for sh!ts and giggles and go for a run. So the 18deg would become 8deg
Also ive had no problems with TR6 plugs on 21psi
Already tried that. When I first fired up the new motor I actually did have very little advance in boost and it still ran great.Originally Posted by JezzaB
Couldn't remember if I removed the second fuel pressure regulator I had at the surge tank as part of the old dual pressure setup while installing the new motor or shortly after. If it was just after, then that may have been the point at which things changed. So today I disconnected the pump feed line from the bottom of the surge tank and the fuel only trickled out, even though the tank was full! So I spent today adding another line from the surge tank to the highest point on the factory tank. Hopefully this is the cure! Did some other tidying up as well while I had the tank out.
2017 Camaro SS, 2014 Ram 2500 4x4 Cummins 6.7L, 2004 Chevy Avalanche Z71 4̶X̶4̶(now 2WD), 5870lb race weight, 10.93@ 124, Twin TVS1900s, Twin Throttle, 429 LSX, 4L80E, custom 14 bolt rear, V2, R̶o̶a̶d̶R̶u̶n̶n̶e̶r̶(dead), COS3......
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Running much better now in boost.
O2s still look wonky in the logs, even more so with a new PCM. The right and left banks were much closer in the first log below which was with the old PCM. The 2nd log(0543) was made 30 min later with a new PCM. The rich spikes are still present.
I reconnected the catch cans today as well. During the 0542 log I collected about 2 oz of oil from the bank 1 valve cover. Bank 2 also had about 2 oz in the can but it has been connected for 70-100 miles.
2017 Camaro SS, 2014 Ram 2500 4x4 Cummins 6.7L, 2004 Chevy Avalanche Z71 4̶X̶4̶(now 2WD), 5870lb race weight, 10.93@ 124, Twin TVS1900s, Twin Throttle, 429 LSX, 4L80E, custom 14 bolt rear, V2, R̶o̶a̶d̶R̶u̶n̶n̶e̶r̶(dead), COS3......
Gettin' the Groceries
Do you have any NB O2 sensors in there? I wonder if the rich spikes are an issue with the WB that you have? Logging the NB O2 voltages might help to show if this is the case.
Simon
Yes, these logs include the NB 02s.
2017 Camaro SS, 2014 Ram 2500 4x4 Cummins 6.7L, 2004 Chevy Avalanche Z71 4̶X̶4̶(now 2WD), 5870lb race weight, 10.93@ 124, Twin TVS1900s, Twin Throttle, 429 LSX, 4L80E, custom 14 bolt rear, V2, R̶o̶a̶d̶R̶u̶n̶n̶e̶r̶(dead), COS3......
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Sorry, for some reason I missed them.....
looking at the NB data, it looks like the rich spikes are only in the WB signal, so it may be a bad connection / broken wire / short in the WB cabling that is causing that. There are a few spots where the NB voltage indicates aa "leaner than stoich" condition, but the WB shows rich spikes. The NB voltage, which should switch faster than the WB signal doesn't show the rich spike.
An interesting thing I see though, is that the NB and WB signals don't match banks. It looks like the bank 1 WB is actually connected to bank 2's exhaust and vice versa. If you are attempting to balance the banks at all, this is going to cause a few issues......
Simon
Yes it appeared to me also that the banks might be switched. With both widebands connected to the serial input of the V2, will the furthest or nearest to the V2 be designated as WB1?
I am not very confident that either of the widebands are accurate. But I have not been using the data from the one that exhibits the rich spikes. I am still concerned that neither the wide nor the narrow bands show any sort of balance between banks 1 &2.
2017 Camaro SS, 2014 Ram 2500 4x4 Cummins 6.7L, 2004 Chevy Avalanche Z71 4̶X̶4̶(now 2WD), 5870lb race weight, 10.93@ 124, Twin TVS1900s, Twin Throttle, 429 LSX, 4L80E, custom 14 bolt rear, V2, R̶o̶a̶d̶R̶u̶n̶n̶e̶r̶(dead), COS3......
Gettin' the Groceries
The bank 1 & 2 widebands definitley are swapped. I left that as is for now and just swapped the sensors. The rich blips did not go to bank 2 , but now bank 1 cuts out after 2 min of operation and has to be reset by a restart. Bank 2 had a couple of blips to 5XX AFR. Bank 1 also shot up at the same time even though it had been stuck at 58 for a while.
2017 Camaro SS, 2014 Ram 2500 4x4 Cummins 6.7L, 2004 Chevy Avalanche Z71 4̶X̶4̶(now 2WD), 5870lb race weight, 10.93@ 124, Twin TVS1900s, Twin Throttle, 429 LSX, 4L80E, custom 14 bolt rear, V2, R̶o̶a̶d̶R̶u̶n̶n̶e̶r̶(dead), COS3......
Gettin' the Groceries
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