Most if not all mass produced engines have exhaust manifold made from cast iron, Nissan's ZD30 included, cheap to make, good heat resistance.
Cheers
Most if not all mass produced engines have exhaust manifold made from cast iron, Nissan's ZD30 included, cheap to make, good heat resistance.
Cheers
Last edited by Rumcajs; 28th June 2012 at 09:30 AM.
xcape08 (29th June 2012)
Hi Rumcajs...i see...ok thanks...
another question for u Rumcajs.(or Forum)...running 20psi my turbo is making a loud whistling noise at around 2000-2500 rpms..the guy how in creased the boost says that the turbo is just freer that why the noise....whats ur opinion ?...cheers Eric
if your not happy with 20psi bring it back to 16 /18 psi or lower 14 then see how it runsOriginally Posted by xcape08
turbos are meant to whistle, that noise is fine. it won't hurt your turbo.. we have set up nissan patrols running 24psi of boost that have towed vans around australia. 20psi is safe with that turbo. if you are worried about it, bring it back down a little but you will lose economy by bringing your boost down and some power.
While turbo can certainly make a noise, chances are that if you can hear it that loud you have a problem. I wouldn't be surprised that either because the exhaust manifold was off/ fixed the installation got f-ed up so there are loose exhaust bolts somewhere on the dump flange/pipe/gaskets missing/blown off perhaps or even worse manifold bolts loose or gasket blown. Wouldn't be discounting a boost leak either.
Am I understanding you correctly, is this noise happening now after the recent repairs or only since the tuner bumped the boost up?
I have straight through 3" exhaust and still can't hear my turbo whistling at 18 psi. If everything is fitted and sealed properly you will only hear a faint spool up noise at best. So if it is a loud high pitch noise under load than you have either exhaust leak or possibly boost leak from loose hose, hole in the inter-cooler or else. If you didn't hear it before and now you can than .......you be the judge.
Last edited by Rumcajs; 29th June 2012 at 08:29 PM.
Hi Rumcajs....its been happening even before i had issues with the manifold warping,it been happening as soon as i got the boost changed to 20psi...but ill get them to go through it all again, i need to bring it back to Nissan to check the work they did on the exhaust manifold.
thanks again mate for ur reply..ill keep u informed
I'm actually wondering if the EGR pipe is not cracked, apparently it is a common thing on CrD Patrols as well.
Cheers
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