5 more PSI, same trap speed
10-06-2016, 07:05 AM
#105
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More power fixes everything!!!
I wonder if your lifters are having trouble at high rpm. They don't normally start having trouble out of the blue, but I did see a problem car this summer that would fall off under load at high rpm, it had new GM lifters. It was NA car and just went flat at high load/rpm, but it was sometimes decent. Swapped in a set of lifters and it cleared up.
Kurt
I wonder if your lifters are having trouble at high rpm. They don't normally start having trouble out of the blue, but I did see a problem car this summer that would fall off under load at high rpm, it had new GM lifters. It was NA car and just went flat at high load/rpm, but it was sometimes decent. Swapped in a set of lifters and it cleared up.
Kurt
10-06-2016, 08:38 AM
#106
Appreciate the offer, But I’d like to get it running right on the tires I have. If smaller tires and less boost fixed the issue, that would tell me the turbo was out of steam. Bigger turbo would tell me the same thing I think.
Guess swapping coils is always an option, but I don’t have another set of D-585’s and it’s not cheap enough to buy a set on a hunch. I don’t think coils would all be failing at once? Wouldn’t a coil issue show up pretty clearly on its individual cylinder? Could swap them out for the square truck coils. Installed these D-585 coils last year, and the car picked up quite over the square truck coils I was running, so I’m hesitant to go back to them. Plugs don’t indicate any kind of failing/weak ignition. I’ve trimmed the cylinder fueling individually to get all the plugs looking really similar, so it would be easy to see if one cyl wasn’t firing I’d think?
Turbo arrives today!
Aside from the balance job, the lifters are the only thing I can think of that changed. Tried to do the right thing and replace the 130k+ Gen3 lifters with the newer versions while the engine was out. Would be typical if that was the problem! No real way to diagnose that issue either is there? If the lifters were the issue, would the engine still rev to 7k ok in first gear though?
Valve train has OEM noise levels. Injectors are louder than the valve train at 1000RPM. No idea what they are doing at RPM though.
More power fixes everything!!!
I wonder if your lifters are having trouble at high rpm. They don't normally start having trouble out of the blue, but I did see a problem car this summer that would fall off under load at high rpm, it had new GM lifters. It was NA car and just went flat at high load/rpm, but it was sometimes decent. Swapped in a set of lifters and it cleared up.
Kurt
I wonder if your lifters are having trouble at high rpm. They don't normally start having trouble out of the blue, but I did see a problem car this summer that would fall off under load at high rpm, it had new GM lifters. It was NA car and just went flat at high load/rpm, but it was sometimes decent. Swapped in a set of lifters and it cleared up.
Kurt
Aside from the balance job, the lifters are the only thing I can think of that changed. Tried to do the right thing and replace the 130k+ Gen3 lifters with the newer versions while the engine was out. Would be typical if that was the problem! No real way to diagnose that issue either is there? If the lifters were the issue, would the engine still rev to 7k ok in first gear though?
Valve train has OEM noise levels. Injectors are louder than the valve train at 1000RPM. No idea what they are doing at RPM though.
10-06-2016, 12:00 PM
#109
TECH Resident
Go over exactly what it did after the last pass. You said it ran poorly in the pits and you added fuel to nurse it home. Did it run poorly on the return road?
You said you switched to an old tune and all seemed well. Was this done right after getting home or did you let it sit and cool?
Have you gone back to your last tune and checked how it ran?
Trying to narrow this down to electrical or mechanical.
You said you switched to an old tune and all seemed well. Was this done right after getting home or did you let it sit and cool?
Have you gone back to your last tune and checked how it ran?
Trying to narrow this down to electrical or mechanical.
10-06-2016, 12:54 PM
#110
May have fixed the most recent problem. Don’t think it has anything to do with the no power/RPM issue.
Went to fire the car this morning and it was acting similar to how it did at the track. Died immediately after firing. Hoping my issues last track outing are centered around the idle motor sticking during the pass. It wasn’t responding to changes made on the ECU today anyway. MS3 lets you test outputs. Popped the IAC off and it would click, but not move the plunger. Smacked it around a bit and it came back to life and cycled just fine. Would explain why it worked fine at WOT and was going crazy lean/rich and not idling after the run and being intermittent afterward.
Replaced it with a spare I had. So far so good. Fired right up and idled ok anyway.
Went to fire the car this morning and it was acting similar to how it did at the track. Died immediately after firing. Hoping my issues last track outing are centered around the idle motor sticking during the pass. It wasn’t responding to changes made on the ECU today anyway. MS3 lets you test outputs. Popped the IAC off and it would click, but not move the plunger. Smacked it around a bit and it came back to life and cycled just fine. Would explain why it worked fine at WOT and was going crazy lean/rich and not idling after the run and being intermittent afterward.
Replaced it with a spare I had. So far so good. Fired right up and idled ok anyway.
10-07-2016, 06:30 AM
#113
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Appreciate the offer, But I’d like to get it running right on the tires I have. If smaller tires and less boost fixed the issue, that would tell me the turbo was out of steam. Bigger turbo would tell me the same thing I think.
Guess swapping coils is always an option, but I don’t have another set of D-585’s and it’s not cheap enough to buy a set on a hunch. I don’t think coils would all be failing at once? Wouldn’t a coil issue show up pretty clearly on its individual cylinder? Could swap them out for the square truck coils. Installed these D-585 coils last year, and the car picked up quite over the square truck coils I was running, so I’m hesitant to go back to them. Plugs don’t indicate any kind of failing/weak ignition. I’ve trimmed the cylinder fueling individually to get all the plugs looking really similar, so it would be easy to see if one cyl wasn’t firing I’d think?
Turbo arrives today!
Aside from the balance job, the lifters are the only thing I can think of that changed. Tried to do the right thing and replace the 130k+ Gen3 lifters with the newer versions while the engine was out. Would be typical if that was the problem! No real way to diagnose that issue either is there? If the lifters were the issue, would the engine still rev to 7k ok in first gear though?
Valve train has OEM noise levels. Injectors are louder than the valve train at 1000RPM. No idea what they are doing at RPM though.
Guess swapping coils is always an option, but I don’t have another set of D-585’s and it’s not cheap enough to buy a set on a hunch. I don’t think coils would all be failing at once? Wouldn’t a coil issue show up pretty clearly on its individual cylinder? Could swap them out for the square truck coils. Installed these D-585 coils last year, and the car picked up quite over the square truck coils I was running, so I’m hesitant to go back to them. Plugs don’t indicate any kind of failing/weak ignition. I’ve trimmed the cylinder fueling individually to get all the plugs looking really similar, so it would be easy to see if one cyl wasn’t firing I’d think?
Turbo arrives today!
Aside from the balance job, the lifters are the only thing I can think of that changed. Tried to do the right thing and replace the 130k+ Gen3 lifters with the newer versions while the engine was out. Would be typical if that was the problem! No real way to diagnose that issue either is there? If the lifters were the issue, would the engine still rev to 7k ok in first gear though?
Valve train has OEM noise levels. Injectors are louder than the valve train at 1000RPM. No idea what they are doing at RPM though.
The IAC does not have enough flow to mess up your car when it's driving, it could cause low/high idle, but it won't cause lean driving. I would make sure the regulator did not get stuck open on throttle cut or fuel pump problem. If both of those are OK it's in the controller/sensors.
Kurt
10-07-2016, 06:49 AM
#114
Idle Air Control motor...
Been running the same Mallory FRP for 5 years or so now. It's due for a tear down anyway, I'll look into it. Wouldn't a sticking FPR or failing pump issue show up in the fuel pressure logs?
http://www.jegs.com/i/MSD-Ignition/121/29389/10002/-1
Fuel pressure was steady, but I did recently install the larger MSD "boost-a-pump" that's setup to activate around 10lbs and deliver 18v.
The lifters I've seen with problems were GM type that are bought in bulk. The problem car would only do it in high load, they kept chasing coils/wires thinking it was ignition. The one difference is it sometimes would be fine. After putting Johnson lifters in the car it is still working well!
The IAC does not have enough flow to mess up your car when it's driving, it could cause low/high idle, but it won't cause lean driving. I would make sure the regulator did not get stuck open on throttle cut or fuel pump problem. If both of those are OK it's in the controller/sensors.
Kurt
The IAC does not have enough flow to mess up your car when it's driving, it could cause low/high idle, but it won't cause lean driving. I would make sure the regulator did not get stuck open on throttle cut or fuel pump problem. If both of those are OK it's in the controller/sensors.
Kurt
http://www.jegs.com/i/MSD-Ignition/121/29389/10002/-1
Fuel pressure was steady, but I did recently install the larger MSD "boost-a-pump" that's setup to activate around 10lbs and deliver 18v.
10-07-2016, 06:57 AM
#115
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The FP logs would easily alert you of problems, I was just thinking about what could cause your lean problem that required adding fuel in the base map that was not the controller/sensors. Still sounds likely the controller has problems, not sure if they are connected with your rpm/load problems.
Kurt
Kurt
Idle Air Control motor...
Been running the same Mallory FRP for 5 years or so now. It's due for a tear down anyway, I'll look into it. Wouldn't a sticking FPR or failing pump issue show up in the fuel pressure logs?
http://www.jegs.com/i/MSD-Ignition/121/29389/10002/-1
Fuel pressure was steady, but I did recently install the larger MSD "boost-a-pump" that's setup to activate around 10lbs and deliver 18v.
Been running the same Mallory FRP for 5 years or so now. It's due for a tear down anyway, I'll look into it. Wouldn't a sticking FPR or failing pump issue show up in the fuel pressure logs?
http://www.jegs.com/i/MSD-Ignition/121/29389/10002/-1
Fuel pressure was steady, but I did recently install the larger MSD "boost-a-pump" that's setup to activate around 10lbs and deliver 18v.
U asked? OEM as in Original GM Equipment vs a reman offshore deal? Not sure what the question was...