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Old 12-30-2018, 03:53 AM   #1
nickvolvo746
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Default help me boost(wooooshhhhh)

1990 760 turbo

Recently installed a Circuit 7 boost controller:

turned it up to about 10-12 psi and it felt a wee bit faster or "peppy", as many of the old lady volvo owners would say. anyway. many weeks later it starts sputtering once I start making boost, so I decided to take the controller off and just reconnect it like normal and now it doesnt sputter. So, where did I go wrong? I triple checked the hoses, clamps and I feel confident I had it set up correctly. Maybe was it leaning out? Im thinking I just expect to much from an antique but also I feel that upping the psi to 10 should be ok, so perhaps the fact that it cant handle it is a sign of something else going on...
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Old 12-30-2018, 07:43 AM   #2
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No wideband? Get one first.
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Old 12-30-2018, 01:25 PM   #3
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Maybe you hit the boost cut.
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Old 12-30-2018, 01:37 PM   #4
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Sounds like the intake hose is collapsing under boost.
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Old 12-30-2018, 10:54 PM   #5
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+1^ make sure intercooler hoses aren't squishy, especially the longer rubber ones. Got a boost gauge? Where does the problem start? Boost leak? Use a socket on intercooler lines, not a screwdriver.
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Old 12-31-2018, 12:39 PM   #6
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Your antique is perfectly able to handle boost. But only if everything is in good condition.

Possible causes of performance problems:
Collapsing intake hose (replace intake hose and modify airbox to make it less restrictive)
Bad hall- or VR-sensor. They fail due to heat-stress and are located next to the downpipe!
Boost leaks (vacuum lines, intake gasket, intercooler hoses, intercooler)
Clogged flame trap/oil separator.
Clogged cat.
Dirty AMM.
Failing engine temp sensor.
Bad Knock sensor!
Detoriating engine harness (look at the condition of the cables near the injectors).
Dirty air filter, old oil and oil filter, spark plugs, non-bougicord spark plug wires.
Boost-controller (bad quality boost controller, or too soft spring inside)
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Old 12-31-2018, 05:54 PM   #7
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Yeah I bet the inlet boot is getting sucked shut. Crank her up to 12 and power stall it with the hood open and someone watching outside.
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Old 12-31-2018, 06:34 PM   #8
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Quote:
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Yeah I bet the inlet boot is getting sucked shut. Crank her up to 12 and power stall it with the hood open and someone watching outside.
No no no, lay flat on the open hood. watch carefully while the driver accelerates to highway speeds. It's the only way to get an accurate reading.
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Old 12-31-2018, 09:08 PM   #9
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I've had all of the boost hoses on my 88 765 with B230FT go bad at one time or another from oil contamination.
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Old 01-01-2019, 03:11 PM   #10
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In my experience a major cause of this is spark blowout from the spark plug gap being too large/spark is weak. Make sure the gap is .028" and that the plugs are new or like new. If they are copper plugs and more than a year old they are worn out and need replacement anyway. Of course it may also be that you have a couple issues so also check for the intake hose to the turbo collapsing as well as the other suggestions.
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Old 01-01-2019, 04:43 PM   #11
nickvolvo746
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Thanks a bunch for the responses yall, this has given me a lot of things to check. Ill try and add a wideband soon and ill check all my hoses for squishiness.
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Old 01-01-2019, 04:59 PM   #12
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I've been running a set of Autolite Iridium tipped spark plugs for more that 30k miles. I took one out at 30k and it was still in good shape.
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