2005 SE-R Dyno
12-18-2010, 08:01 PM
#1
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2005 SE-R Dyno
low numbers....
Video:
http://s68.photobucket.com/albums/i1...218_155002.mp4
upon looking at the exhaust manifold, i found three holes! wtfreak!?
now my question is, could these holes cause me to lose all that hp? what could be causing such a drop?
modifications are: intake, cattman y/b pipe, nwp spacers
Video:
http://s68.photobucket.com/albums/i1...218_155002.mp4
upon looking at the exhaust manifold, i found three holes! wtfreak!?
now my question is, could these holes cause me to lose all that hp? what could be causing such a drop?
modifications are: intake, cattman y/b pipe, nwp spacers
12-18-2010, 09:58 PM
#2
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Looks about where I would expect for your mods right up until just before 5.5k...Something is definitely wrong at that point. It looks more severe than an exhaust leak could cause, but I'm no expert.
12-19-2010, 03:50 PM
#7
Yes, exhaust leaks CAN cause you to lose power. Especially when you're getting in fresh air through there and the o2 sensors are seeing that. They will richen up the mixture to prevent engine damage since they think the engine is running leaner. That's probably what's happening. The ECU naturally dumps in tons of fuel past 5k but with those exhaust leaks.. the condition might be getting worse.
If you're under warranty contact the dealer and they'll replace them. If not, shouldn't cost more then $20 bucks to have a shop weld it up for you.
If you're under warranty contact the dealer and they'll replace them. If not, shouldn't cost more then $20 bucks to have a shop weld it up for you.
12-19-2010, 04:57 PM
#8
your #'s look about right for the mods what did you put down before. To me it looks like the dyno operator either let off or there was a problem with the signal. A exhaust leak of that size at high rpms will not cause a power loss
12-19-2010, 06:21 PM
#9
12-19-2010, 08:39 PM
#10
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Yes, exhaust leaks CAN cause you to lose power. Especially when you're getting in fresh air through there and the o2 sensors are seeing that. They will richen up the mixture to prevent engine damage since they think the engine is running leaner. That's probably what's happening. The ECU naturally dumps in tons of fuel past 5k but with those exhaust leaks.. the condition might be getting worse.
If you're under warranty contact the dealer and they'll replace them. If not, shouldn't cost more then $20 bucks to have a shop weld it up for you.
If you're under warranty contact the dealer and they'll replace them. If not, shouldn't cost more then $20 bucks to have a shop weld it up for you.
this is the first time i've dynoed my car
12-20-2010, 06:43 AM
#11
Yes, exhaust leaks CAN cause you to lose power. Especially when you're getting in fresh air through there and the o2 sensors are seeing that. They will richen up the mixture to prevent engine damage since they think the engine is running leaner. That's probably what's happening. The ECU naturally dumps in tons of fuel past 5k but with those exhaust leaks.. the condition might be getting worse.
If you're under warranty contact the dealer and they'll replace them. If not, shouldn't cost more then $20 bucks to have a shop weld it up for you.
If you're under warranty contact the dealer and they'll replace them. If not, shouldn't cost more then $20 bucks to have a shop weld it up for you.
12-20-2010, 10:31 AM
#13
Yes, essential1 you're right. The O2 sensors don't play any role in open-loop. But this is also assuming that the ECU isn't in closed loop during the runs due to a richening A/F? I've seen it before where cars we'll be in closed loop even when at WOT and will just out-right start pissing fuel out of the exhaust. But it could be possible this could be a missed signal, detonation and/or a mistake by the dyno operator.
Any codes OP? What did they use to get a RPM signal? What was the A/F?
My advice is get those exhaust leaks fixed and do a re-dyno. See if that helps any. If it doesn't then the problem is obviously somewhere else. If it does, then.. there we go.
Last edited by 2002AltimateV6; 12-20-2010 at 10:39 AM.
12-20-2010, 11:56 AM
#14
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That's a bit optimistic. I think you would have plateaued around 235'ish WHP and then it would have stayed that way till maybe 6300-6400 where you might see it start falling just a tad.
Yes, essential1 you're right. The O2 sensors don't play any role in open-loop. But this is also assuming that the ECU isn't in closed loop during the runs due to a richening A/F? I've seen it before where cars we'll be in closed loop even when at WOT and will just out-right start pissing fuel out of the exhaust. But it could be possible this could be a missed signal, detonation and/or a mistake by the dyno operator.
Any codes OP? What did they use to get a RPM signal? What was the A/F?
My advice is get those exhaust leaks fixed and do a re-dyno. See if that helps any. If it doesn't then the problem is obviously somewhere else. If it does, then.. there we go.
Yes, essential1 you're right. The O2 sensors don't play any role in open-loop. But this is also assuming that the ECU isn't in closed loop during the runs due to a richening A/F? I've seen it before where cars we'll be in closed loop even when at WOT and will just out-right start pissing fuel out of the exhaust. But it could be possible this could be a missed signal, detonation and/or a mistake by the dyno operator.
Any codes OP? What did they use to get a RPM signal? What was the A/F?
My advice is get those exhaust leaks fixed and do a re-dyno. See if that helps any. If it doesn't then the problem is obviously somewhere else. If it does, then.. there we go.
i have a p0173. it's an a/f code, which makes sense since the exhaust leak...
i'm always optimistic
There's a thin line between optimism and delusion. 
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