Notice: We request that you don't just set up a new account at this time if you are a previous user.
If you used to be one of our moderators, please feel free to reach out to Chris via the facebook Outerlimits4x4 group and he will get you set back up with access should he need you.
Recovery:If you cannot access your old email address and don't remember your password, please click here to log a change of email address so you can do a password reset.

Losing boost after 3000rpm

Tech Talk for Nissan owners.

Moderators: toaddog, V8Patrol

Forum rules
Post Reply
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.
Top
Posts: 898
Joined: Wed Nov 29, 2006 6:16 pm
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
Top
Posts: 76
Joined: Sat Mar 21, 2009 10:47 am
Location: Cairns, QLD

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.
Top
Posts: 1256
Joined: Mon Jun 19, 2006 7:05 pm
Location: newzealand

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.
Top
Posts: 305
Joined: Mon Apr 21, 2008 8:53 am
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
Top
Posts: 1258
Joined: Wed Mar 21, 2007 7:49 pm
Location: Mornington/ Victoria

Contact:
Contact PGS 4WD

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
-Pre trip inspections/ servicing
-Suspension/ custom modifications
-4wd Dyno & tuning
-Qualified mechanics
Top
Posts: 2
Joined: Thu Jul 02, 2009 12:46 pm
Location: Sunny Coast

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
Top
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 your all comments.
Top
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.
Top
Post Reply

Return to “Nissan”

Who is online

Users browsing this forum: No registered users and 13 guests