Another new PB 9.57 @ 142.03
11-19-2009, 12:47 AM
#1
Another new PB 9.57 @ 142.03 I got a new PB Saturday night.
60 = 1.361
330 =3.965
1/8 =6.131
MPH =113.47
1000=7.994
1/4 =9.576
MPH =142.03
I didn't post it sooner because the time slip was in the car and it went back to Steve's on the trailer due to some issues that I wanted to get resolved.
On the pass after this one, I turned the boost up a little more as it was still running pretty rich (mid to high 10's AFR). I had already determined that the wastegate diaphragm was leaking but figured I'd just put a little more pressure to it to squeeze some more out of her. When I launched the tires shook so hard that I let off immediately. It felt like it sheared the lugs off the rear tires and I fully expected one of them to go rolling past me. I coasted down the track and as soon I slowed to an idle to pick up the bad slip, the car started running horribly. AFR pegged lean. I quickly realized that the MAP sensor was not operating correctly. We switched it out with the one in Steve's truck and it was still doing it. Finally Steve had me start the car and he pulled the MAP sensor out. Car died. Plugged it back in and fired the car up again and it was fine. The boost pressure must have pushed something into the line and the sudden vacuum must have cleared it out.:shrug:
I was leaking oil from somewhere on the top of the motor also and since PBIR was going to be doing some bracket racing event all this week, I figured I'd remove the intake and try to find the problem. Finally got it off today and sure enough, the valley cover had puddles of oil in the holes for the knock sensors. Mike @ TEC gave me some new seals and I swapped them out. Hopefully it will resolve that issue.
I ordered a new diaphragm yesterday so I should be ready to run by next Wednesday when things get back to normal at PBIR. Here's the log showing the boost pressure all over the place on that last pass.
This is a double edged sword as it makes you jump around all over the fueling (VE) table and because the fuel pressure regulator is boost referenced it is constantly bouncing the pressure +/- 2 psi which further ***** up fueling. I suspect that is why I am missing about 2 MPH on the long end. Once I get this steady, it should have a bottom 9.4 in it at 15 psi or so.
60 = 1.361
330 =3.965
1/8 =6.131
MPH =113.47
1000=7.994
1/4 =9.576
MPH =142.03
I didn't post it sooner because the time slip was in the car and it went back to Steve's on the trailer due to some issues that I wanted to get resolved.
On the pass after this one, I turned the boost up a little more as it was still running pretty rich (mid to high 10's AFR). I had already determined that the wastegate diaphragm was leaking but figured I'd just put a little more pressure to it to squeeze some more out of her. When I launched the tires shook so hard that I let off immediately. It felt like it sheared the lugs off the rear tires and I fully expected one of them to go rolling past me. I coasted down the track and as soon I slowed to an idle to pick up the bad slip, the car started running horribly. AFR pegged lean. I quickly realized that the MAP sensor was not operating correctly. We switched it out with the one in Steve's truck and it was still doing it. Finally Steve had me start the car and he pulled the MAP sensor out. Car died. Plugged it back in and fired the car up again and it was fine. The boost pressure must have pushed something into the line and the sudden vacuum must have cleared it out.:shrug:
I was leaking oil from somewhere on the top of the motor also and since PBIR was going to be doing some bracket racing event all this week, I figured I'd remove the intake and try to find the problem. Finally got it off today and sure enough, the valley cover had puddles of oil in the holes for the knock sensors. Mike @ TEC gave me some new seals and I swapped them out. Hopefully it will resolve that issue.
I ordered a new diaphragm yesterday so I should be ready to run by next Wednesday when things get back to normal at PBIR. Here's the log showing the boost pressure all over the place on that last pass.
This is a double edged sword as it makes you jump around all over the fueling (VE) table and because the fuel pressure regulator is boost referenced it is constantly bouncing the pressure +/- 2 psi which further ***** up fueling. I suspect that is why I am missing about 2 MPH on the long end. Once I get this steady, it should have a bottom 9.4 in it at 15 psi or so.
11-19-2009, 08:12 AM
#4
TH350 RMVB and an FTI Converter. On that log I posted up, you can see it stall up to about 4600-4700 RPM
For this outing I drained the pump gas and put in 116 oct. Just to be safe. I was still only running 18* of timing. My raceweight for this pass was about 3750#. I pulled out the subwoofer and amp.
For this outing I drained the pump gas and put in 116 oct. Just to be safe. I was still only running 18* of timing. My raceweight for this pass was about 3750#. I pulled out the subwoofer and amp.
