Audible Knocking above 3K RPM's
01-20-2010, 09:17 AM
#45
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computer would only adjust in closed loop mode. Depending on what you use for ecu the open loop mapping will be fixed therefore it would only affect the tune if they were blown before tuning. If the car was tuned then they blew out and cause the wideband to read lean it wouldn't matter because the amount of fuel poured into the engine during open loop doesn't depend on feedback from the o2 sensors (unless a feedback is setup which is highly unlikely someone would do this for WOT tuning).
01-23-2010, 08:26 AM
#46
computer would only adjust in closed loop mode. Depending on what you use for ecu the open loop mapping will be fixed therefore it would only affect the tune if they were blown before tuning. If the car was tuned then they blew out and cause the wideband to read lean it wouldn't matter because the amount of fuel poured into the engine during open loop doesn't depend on feedback from the o2 sensors (unless a feedback is setup which is highly unlikely someone would do this for WOT tuning).
02-16-2010, 12:39 PM
#48
Sorry to hear about the confirmed loss of, well, everything... So WTF caused it? The bearing was done before you idled it and noticed the sound. Any hard tracking just prior? Over-revving incident? Any loss of oil pressure? It lasted 5k miles after the install and tune and then decided to die? Something is not right.
I would recommend taking the car to Forged Performance, get a girdle on there, and never look back. Good luck.
I would recommend taking the car to Forged Performance, get a girdle on there, and never look back. Good luck.
Last edited by rcdash; 02-16-2010 at 12:46 PM.
02-17-2010, 04:12 PM
#50
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Sorry to hear about the confirmed loss of, well, everything... So WTF caused it? The bearing was done before you idled it and noticed the sound. Any hard tracking just prior? Over-revving incident? Any loss of oil pressure? It lasted 5k miles after the install and tune and then decided to die? Something is not right.
I would recommend taking the car to Forged Performance, get a girdle on there, and never look back. Good luck.
I would recommend taking the car to Forged Performance, get a girdle on there, and never look back. Good luck.
I never been to a track....ever. I didn't over rev it, the highest I shift is 6K.
03-16-2010, 10:20 AM
#51
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Well here is the verdict.
-#1 cylinder was the one that was bad.
-It looks like it had some severe detonation going on.
-Block, pistons and rods were undamaged
-Crankshaft is beyond repair limits
Pic 1-shows all 6 rods and bearings. Notice the #1 cylinder is all the way to the brass and obviously discolored from the other 5 which are OK
Pic 2-shows a close up of the #1 bearings. You can see they are flattened from the detonation and obviously down to the brass
Pic 3-shows the #1 bearings vs the #2 bearings. Notice the color difference and how flattened the #1 bearings are vs the #2 bearings
Pic 4-shows a close up of the top bearing #1 vs #2...notice how flattened out the #1 bearing is vs the #2
Pic 5-shows the excessive carbon on the piston top and clean edges on the #1 cylinder indicating detonation in that cylinder
-#1 cylinder was the one that was bad.
-It looks like it had some severe detonation going on.
-Block, pistons and rods were undamaged
-Crankshaft is beyond repair limits
Pic 1-shows all 6 rods and bearings. Notice the #1 cylinder is all the way to the brass and obviously discolored from the other 5 which are OK
Pic 2-shows a close up of the #1 bearings. You can see they are flattened from the detonation and obviously down to the brass
Pic 3-shows the #1 bearings vs the #2 bearings. Notice the color difference and how flattened the #1 bearings are vs the #2 bearings
Pic 4-shows a close up of the top bearing #1 vs #2...notice how flattened out the #1 bearing is vs the #2
Pic 5-shows the excessive carbon on the piston top and clean edges on the #1 cylinder indicating detonation in that cylinder
03-16-2010, 10:22 AM
#52
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Pic 6-shows #1 piston vs #2 piston...notice the difference in carbon build up on #1 vs #2
Pic 7-shows the damage to the #1 crank journal.
I'm still waiting for the BlackStone Lab findings. I'll post them as soon as I get them. As to what causes detonation in only in the #1 cylinder, I need to find out.
Pic 7-shows the damage to the #1 crank journal.
I'm still waiting for the BlackStone Lab findings. I'll post them as soon as I get them. As to what causes detonation in only in the #1 cylinder, I need to find out.
Last edited by citymunky; 03-16-2010 at 10:29 AM.
03-16-2010, 10:29 AM
#53
I think it would be highly unlikely for airflow to cylinder 1 to have been greater than the others (driver's side bank gets more air). Therefore if you suspect detonation in a single cylinder, I would check fuel injector #1. Sucks if that comes back as the culprit...
03-16-2010, 01:35 PM
#57
To make sure that you don't get shady test results from Deatchwerks to exonerate themselves from any blame for your detonation...
Not that I would say Deatchwerks are shady or something...what I heard so far they are a good, upfront company, but it would be extra reassuring to get impartial data from a third party to analyze your injector's performance...
Not that I would say Deatchwerks are shady or something...what I heard so far they are a good, upfront company, but it would be extra reassuring to get impartial data from a third party to analyze your injector's performance...
Last edited by 350z006; 03-16-2010 at 01:37 PM.
03-16-2010, 05:11 PM
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Currently the G35 is in storage. All the parts are packed in boxes inside the car. I can get to all of it, but not right now.
