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Losing boost after 3000rpm

Tech Talk for Nissan owners.

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Posts: 41
Joined: Sat Jan 14, 2006 11:53 am
Location: [Brisbane] With a foot full of throttle! Letter rip!

Losing boost after 3000rpm

Post by NissanTuff »

I got 4.2 turbo (DTS Kit) diesel GQ and im losing boost and power after 3000rpm every gear. Blows black smoke when it loses boost. Drops from 11psi down to 2psi. Not sure whats going on.
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Location: Melb S/E

Post by NutterGQ »

Check any rubber or silicone joiners between the air box and the turbo are not sucking in first.
My bitch has boost, Nutter Engineering Turbo GQ
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Post by neilpatrol »

Sounds like the waste gate actuator failing. Try disconnecting it mate. Have found the same problem on 2 different dts kits now.

It'll be blowing black smoke as it's still getting fuel and not enough air.
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Post by tweak'e »

not sure about waste gate failing (wouldn't that increase boost?)

but common problems would be leaking hose/joins or high inlet restriction. blocked filter, plastic bag caught in filter etc, inlet hose/pipe collapsing under suction.
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Location: New Zealand

Post by garth »

gudday

No boost will drop the oxygen needed to burn the diesel so you'll get black smoke and very high exhaust temps.

waste gate seems the likely problem, gate spring more likely the suspect as minimum boost will be determined by the spring rate installed in gate itself.
Actuator just increases boost by lowering the pressure emitted on it.
Doubt its a air filter blockage as you say you can still pull 11psi of boost.

Also is the engine using oil???? maybe dropping oil into compressor side from Labrinth seal at 3000rpm????

interesting...let us know what ya find

good luck
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Post by PGS 4WD »

I've seen soft intake hoses suck in and cause that, try removing the flexible ducting and going for a drive.

Joel
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Post by low_k3y »

Second that ^^ check your rubber ducting before doing anything else, common for them to suck shut at high revs if they are soft or worn.
cheers
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Joined: Sat Jan 14, 2006 11:53 am
Location: [Brisbane] With a foot full of throttle! Letter rip!

Post by NissanTuff »

Worked out what is was. I bought a filter sock that goes in the of the snorkel at the top. Took it out all good now. So thanks for your all comments.
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Posts: 41
Joined: Sat Jan 14, 2006 11:53 am
Location: [Brisbane] With a foot full of throttle! Letter rip!

Post by NissanTuff »

Worked out what is was. I bought a filter sock that goes in the of the snorkel at the top. Took it out all good now. So thanks for all your comments.
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