20psi boost is that to high?

Thanks Rumcaj..for ur advice,ill get the codes looked at and the cat checked as well. the patrol was blowing black smoke well before the tuner done any work on it, from day one when i brought it.
Its at a Nissan dealer at the moment getting the exhaust manifold done again(second time in 31/2 yrs the trucks only done 103000km).
They also said that the turbo has a slight oil leek as well, do u have any clue what might cause that to happen?
Look forward to any other feedback u can give me, very much appreciated.Cheers Eric

I have Dawes Valve fitted set 18psi and a boost gauge. The Maxium boost it gets to is 14psi, generallt running at 10-12psi, so i think 20psi a bit high

cheers

fred

thanks Fred for ur reply...cool..im going to look at resetting the value a little lower

Turbo has a "slight oil leak" is very broad description of a problem. Where is that leak? On the inlet (compressor side) or on the exhaust side (turbine) I wouldn't be surprised if the oil leak the morons are talking about is from all the oil mist turbo sucks from the crankcase breather thanks to unfriendly design (read Nissan/Toyo/Mitsu are too cheap to include oil separator) so there is a lot of oil in the intake itself which turbo than spreads through entire induction system. So fitting a oil catch can in the so called closed crankcase ventilation in the turbo charged engine is a must! What also doesn't help is that ZD30 sump is filled to the brim with oil once again because Nissan was too cheap to re-design the oil pan/sump (read making it bigger capacity) when they had early ZD30 genading because sump capacity and engine requirement for oil volume didn't add up among other design flaws
Research "catch can" e.g. Provent 200. That should be number one mod on any ZD 30 powered Patrols indeed on any turbodiesel having CCV and not having effective separator.
Cheers

Hi Rumcajs..not a 100% sure but 99% sure its on the turbine side,well thats what they told me over the phone,,they wanted to replace the turbo there and then, im going to the dealer in the morning to find out what actually where and how bad it is,like u said it might be nothing,most conversation has been over the phone with them.the patrol has got a catch can put on it. but again thats more info for me to work with and i appreciate it. Cheers Eric

How did you go today? Are they fixing it this time or just replacing failed parts again?
Cheers

LOL..good one,i didnt get a call from them, so i presume they hadnt finished replacing failed parts..smiles..but i will keep u posted on the out come.
Rumcaj if u have any suggestions, on someone i can take my patrol to and knows what there doing, let me know.When i do get my truck back i was going to take it to a Bosch Diesel Dealer at Regency Park,get it all looked at.
Cheers mate Eric

So you are in Adelaide than....which Nissan dealer is your Patrol at? The Bosch agent is MTQ at Opala st Regency Park I suppose they're alright I've only dealt with them through work(heavy trucks diesel fuel systems) so I wouldn't know what they like in small stuff.
Whatever you do, don't take Patrol to HiTech Diesel on Churchill rd at Kilburn, not having very positive experience with them in the past, again mainly through work.
Cheers

I’ve done my exhaust manifold and needed machining, from what i was told by Nissan and read on forums it’s not that uncommon mine went out around 30,000km due to overheating up the Toowoomba range with a loaded trol and towing a overloaded trailer.

hi Rumcajs..my patrol is at Bridgewater nissan..im going to try MTQ..give them the run down and see what they say..ill keep u informed..by the way the tuner i used was AUTOSPORTS ENGINEERING OFF SOUTH RD..they did there best to try and solve the issue, with the boost increase and by passing the factory set airflow.im going to also bring it back to them to decrease the boost a little and see what the think of the turbo leak, they also put in the catch can...Cheers Eric