- Joined
- Dec 25, 2002
- Location
- mont, AL
Whats the BLPT? pressure test?
boost leak pressure test, sorry. that was the evoM creeping back to the surface
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Whats the BLPT? pressure test?
I did some leak checking last night.
- I was able to isolate the intercooler and also the pipes leading into and out of. I stuffed a spray can in the hose end near the throttle body and clamped it, and plugged the idle valve pipe. Then I used a 2" cap with a hole and inserted into the pipe near the turbo outlet. I pumped up to 10psi of regulated air from my compressor. The intercooler held 10psi no problem. No hissing sounds anywhere. Hoses blew up nice and firm, etc.
PASS- I reconnected the intake tube to the thottle. I inflated the tubing again at the turbo side intercooler pipe. I seem to get some small leakage through the cylinders and can hear it in the crankcase. But the pipes and clamps and even the intake manifold gaskets all seem silent. I think thats a pass.
PASS- I did not pressurize the turbocharger itself. And I'm a bit suspicious of that. I did a better job sealing and tightening the clamp at the compressor housing outlet when I replaced that connection. And there might have been some gain there. It does seem to be running slightly better. But I still hear a hissing while driving under boost that I can't hear while pressure testing, or revving idling. Maybe I'll work on plugs and pressure for that section tonight.
MAYBE A LEAK
I tugged at the wastegate rod, and there is some preload on the gate. I remember putting about 1/2 of the hole diameter preload on it when I was working there. It seems the same still.
IAC hoses good? Saw you plugged them on the first part. I split one of those a few months ago, car was way gutless, and that split only showed up around 12-15psi. WG sounds about right.
Fuel pressure good under heavy throttle/boost?
the way I've done mine (and some folks will try to seal it up and let it sit over night, that's a bit excessive imo) is plug the exhaust to catch any potential cylinder blow through, put a cap on the compressor inlet and air the whole thing up to like 25psi or so and listen for leaks. you will hear some escaping into the breather system, but if you're looking for leaks I've found that soapy water in a spray bottle goes a long way to identifying leaks. the first time I did it on my 940 I discovered that:
1) idle air hose split on the backside down at the bottom, and only opened up in boost
2) the blow off valve was leaking around the seal (vband was loose and it needed some rtv encouragement)
3) the charcoal canister lines were shot
the idle air hose I would have eventually figured out, but the other two would have probably persisted
I did not pressurize the turbocharger itself. And I'm a bit suspicious of that. I did a better job sealing and tightening the clamp at the compressor housing outlet when I replaced that connection. And there might have been some gain there. It does seem to be running slightly better. But I still hear a hissing while driving under boost that I can't hear while pressure testing, or revving idling. Maybe I'll work on plugs and pressure for that section tonight.
MAYBE A LEAK
I tugged at the wastegate rod, and there is some preload on the gate. I remember putting about 1/2 of the hole diameter preload on it when I was working there. It seems the same still.
I think its cam timing. Verify that your crank pulley has not slipped. Then re-verify that your cam timing is right. Just my two cents
-sam
Should I just knock the crank pulley and balancer loose to get a look at the timing belt cog pulley and the crank shaft key?
Is that with a .48 turbine housing?
There was a larger hotside on some of the 7's. Even so, I'm rocking a .63 on my 2871r and it's damn quick to spool.