Timing advance and fuel cut

[gob4sho89]

Around 15psi, My car studders like its hitting fuel cut, and my timing jumps from 18-22 all the way to 32-36.WTF Is this what timing does at fuel cut? thanks.

 

[oldman]

1. OK, the more I thought about 34psi, the more it didnt make sense. I went back and inspected my tester, I sat looking at it for about 30 minutes. I then realized how stupid I am. I drove to the gas station about 1 mile away from my house, and hooked up my boost leak tester there. I did not put it on my car, just stuck it on the hose. The pressure was at 75psi on the gauge in about 1/2 a second. I un-pluged it, and sure enough that 75psi stayed put. I had overlooked the check-valve that was built in to the gauge(I didnt think one was there.) I had the gauge welded up backwards, so it was holding pressure out of my system, and the other check valve was holding the pressure in from the other side.. I proceded to put it on my car, hoping that some how putting it on my car would make a difference, and looked at my boost gauge and it read 0. While doing the boost leak test, I had only been looking at the gauge on my tester. I feel so stupid. This evening I will put together a simple, gauge-less, boostleak tester. I should be able to do a boost leak test tomorrow. I will post my results some time tomorrow evening.

Dumbass! Get back to us with the new results.

I went to fix how my mbc is hooked up, and found that the outlet on the compresser housing was pluged with jb weld . Does this mean that I have to take off the turbo, drill and tap it, or is there another way?

Like Calan said, drill and tap your J-pipe. http://www.dsmtuners.com/forums/showthread.php?t=255444

 

[gob4sho89]

Ok, I have not performed a boost leak test yet, but did do a few 3rd gear pulls with the boost turned down below the point at which I think it leaks. The boost was 14psi on this pull. I will post the results of my boost leak test, along with a few more logs by the end of the week.
(3rd gear)
rpm Timing
1432 20
1484 21
1496 13
1556 17
1608 16
1676 16
1724 15
1800 14
1860 14
1940 13
2008 12
2104 10
2176 10
2256 9
2324 8
2424 7
2532 7
2604 6
2740 5
2840 6
2928 8
3076 10
3164 11
3300 10
3392 11
3504 11
3600 11
3708 11
3812 12
3912 12
4052 12
4140 13
4252 13
4348 13
4444 14
4544 15
4648 15
4740 18
4836 18
4908 20
5004 20
5072 20
5180 21
5236 21
5324 22
5384 22
5460 22
5524 23
5604 24
5652 24
5720 25
5800 25
5852 26
5852 26
5904 26
3564 26
3116 33
2692 33
2408 33

How does this look? Any suggestions?

 

[gob4sho89]

I did a boost leak test and found a few leaks, one of my couplers was cracked, so I replaced all of them. I also replaced my vac. lines because some of them were leaking. It solved my studdering issue, and my next question is about the log posted above. Does that look about right? Also, do I have all the supporting mods for a larger turbo (57trim). My turbo now has almost 1/4 inch end play. I am just making sure my car is ready for a big turbo. thanks for all the help