Digital Corpus
Top Post Dawg
Okay, so I'm confident in the cause of the problem, theoretically speaking, and I do not have the really expensive equipment to directly test for it. That said, when I swapped my stock harmonic balancer out for the custom machined assembly that included the modified fluidampr, and then also a 55A polyurethane front engine mount, the problem went from random to regular.
I cannot do redline log pulls on the open road, but when on a dyno this isn't an issue.
Initially this started out in 2nd or 3rd gear, cold engine mounts, loading the engine mounts a specific way, and then it'd happen 50-75% of the time. Now, it is a definitive harmonic event from 2nd to 4th gear (1 & 5 are too extreme that I don't test for it) to where upon steady state or acceleration driving up to 4200 RPM at the soonest, but no later than 4500 RPM, the engine cuts out. I'm extremely confident that relay 109 is being vibrated open and the ECU power is cut.
New relay 109's have held up well for a few months and then fall suspect. The vibration is not perceptible and due to the size of the relay arm and the RPM this occurs at, I doubt I'd be able to sense it.
I've talked with my tuner in the past and he's never heard anything like this. I've not seen it reported here either.
The only other things I could think it might be is the ignition switch, which is "OG" but has given me zero issues.
The primary possible solution I have is a rubber "seat" that is between relay 109 and it's home in central electronics.
Maybe I revert back to my stock harmonic balancer and have my aluminum pulley hub that bolts over the fludamper be balanced at a shop?
I cannot do redline log pulls on the open road, but when on a dyno this isn't an issue.
Initially this started out in 2nd or 3rd gear, cold engine mounts, loading the engine mounts a specific way, and then it'd happen 50-75% of the time. Now, it is a definitive harmonic event from 2nd to 4th gear (1 & 5 are too extreme that I don't test for it) to where upon steady state or acceleration driving up to 4200 RPM at the soonest, but no later than 4500 RPM, the engine cuts out. I'm extremely confident that relay 109 is being vibrated open and the ECU power is cut.
New relay 109's have held up well for a few months and then fall suspect. The vibration is not perceptible and due to the size of the relay arm and the RPM this occurs at, I doubt I'd be able to sense it.
I've talked with my tuner in the past and he's never heard anything like this. I've not seen it reported here either.
The only other things I could think it might be is the ignition switch, which is "OG" but has given me zero issues.
The primary possible solution I have is a rubber "seat" that is between relay 109 and it's home in central electronics.
Maybe I revert back to my stock harmonic balancer and have my aluminum pulley hub that bolts over the fludamper be balanced at a shop?