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  #1  
Old 28-01-09
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Default Increasing turbo boost?

I've read a bit lately about getting more boost out of ya turbo just wondering for a 97 NK 2.8 L
#1 How do you up the boost on them?.
#2 Is it worth doing, does it make a big difference?.
#3 Are there any problems likely to encounter long/short term with doing it?.
Cheers.
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Last edited by sharky; 28-01-09 at 04:08 PM.
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  #2  
Old 30-01-09
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To answer your 3rd question First........... Problems could occur, if you put to much pressure(AIR) in a balloon what might happen, same sorta shit may happen to the donk on the NK. To Answer you 2ND Question, it is worth while if done right...$$$$$$$$$$$ to do it right. 1St question, Lengthen the Wastegate Actuator...................at your own Judgement, this will cause the turbo to over boost, hence more Kw& Nm.
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Old 31-01-09
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Thanks Hawk I dont know a hell of a lot about the ins and outs of turbos it does sound a bit complicated for me to do. Cheers for the info mate "Steve"
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  #4  
Old 01-02-09
Muzza Muzza is online now
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Hi sharky
The 2.8 engine can take a mild mod with no issues , however you would need some diesel knowledge
The wastegate is set at the factory at 10-11 psi , if you install a adjustable boost controller in the line you can rest it to 15psi ( blow off valve is set at 16psi)
next the injection pump would need to have a little extra fuel addded 1/8-1/4 turn on the maximum fuel screw ( back of pump) and finally a recheck and set of injection timing
in saying that the most common cause of low power in a 2.8 in faulty injectors as they only have a 100k's life
Muzza
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  #5  
Old 01-02-09
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Quote:
Originally Posted by Muzza View Post
Hi sharky
The 2.8 engine can take a mild mod with no issues , however you would need some diesel knowledge
The wastegate is set at the factory at 10-11 psi , if you install a adjustable boost controller in the line you can rest it to 15psi ( blow off valve is set at 16psi)
next the injection pump would need to have a little extra fuel addded 1/8-1/4 turn on the maximum fuel screw ( back of pump) and finally a recheck and set of injection timing
in saying that the most common cause of low power in a 2.8 in faulty injectors as they only have a 100k's life
Muzza
Thanks Muzza Mine goes ok has only done 73k was just wanting a little extra out of it and just a bit worried if I play with it I will bugger it up altogether. I will look into it to see what it cost to do as I said dont know a lot about turbos so would have to get the pro's to tinker with it. Thanks for the info mate Cheers Steve
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  #6  
Old 08-03-09
MattyDucati MattyDucati is offline
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Hi sharky, Ive got a 99 nl with 190000kms and read that the spring in the waste gate weakins after 100000kms or so, this lowers the boost, i bought a boost gauge and fitted it and found mine only had 7psi max. I also bought a boost adjuster tee so i then fitted it also and slowly lifted it to 12psi max. Before the change half throttle would see around 3psi boost and then at full throttle it would just get 7psi now since the change half throttle is about 10psi and full throttle is about 12psi. It get full boost by 2100rpm before it was 2500rpm.
The old girl is alive again
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Old 08-03-09
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Quote:
Originally Posted by MattyDucati View Post
Hi sharky, Ive got a 99 nl with 190000kms and read that the spring in the waste gate weakins after 100000kms or so, this lowers the boost, i bought a boost gauge and fitted it and found mine only had 7psi max. I also bought a boost adjuster tee so i then fitted it also and slowly lifted it to 12psi max. Before the change half throttle would see around 3psi boost and then at full throttle it would just get 7psi now since the change half throttle is about 10psi and full throttle is about 12psi. It get full boost by 2100rpm before it was 2500rpm.
The old girl is alive again
Gday Matt mine has just clocked 73k and although no powerhouse goes ok so would it need a new spring at those K's? I would love to put guage on mine to see what its getting but I dont know much about turbos and would have no idea how to do it. From what you said thats a fair difference did it make a huge difference in power
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Old 08-03-09
MattyDucati MattyDucati is offline
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It has made a big difference in power, it had trouble last time i went to darwin and would only do 105kmh towing the trailer{its a big trailer}, i chucked the trailer on for a dump run today and it done 130 and was still going well.
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Old 09-03-09
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Diesel engines are an "excess air" design - they should always have more than enough air to burn the fuel which is injected.

By upping the boost (beyond original factory specs) all you are doing is adding more air, which won't achieve too much if you don't add more fuel.
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  #10  
Old 09-03-09
MattyDucati MattyDucati is offline
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Yes this is true nj, but factory spec is 12psi, thats what the fuel has been set up to from factory. thats where ive gone back to.
It is a little dangerous not keeping the boost at factory levels as the engine will run rich which in diesels mean high combustion temps which kill engines and turbos
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