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hey i cant post pics right now, my cable modem has given up on me and plus i dont know how , anyway i had a head gasket go out in my car about a month ago while i was driving , im ammusimg it was while i was driving because the guy at the muffler shop and my father hasve both told me the cracks i have in my exhaust manifold and in my turbine manifold ( you know the exhaust part of the turbo) would be from water hitting it while it was really hot thus cracking.

my question is would you guys think it would let out any exhaust pressure out the crack is small and it is not all the way around ,also i bought dei heat exhaust would you think that would help if any? also would the exhaust heating up and cooling down help the crack become larger?
 

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Yes, The crack is going to get bigger every time you heat it up and cool it down, And yes you are going to be lossing some pressure you need to get that fixed...asap..
Good luck
 

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The crack will act as a pressure relief. No need to get it fixed, just drive it til it dies. Cars don't need maintenance, or parts replaced when they go bad. It's a ploy by the parts houses to get you to buy stuff you don't need. It should go for 100 yrs with no repairs.
 

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HAHA..
 

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Ive got a leaky exhaust manifold on the drivers side in my NA; but Im currently getting custom extractors made to replace the stock exhaust manifold all together. Wrecked Z's dont exist where I live, and buying new exhaust manifolds from nissan was so expensive you dont even want to know. Obviously a turbo setup is different but just thought i'd mention what I am doing for my NA. I couldnt bring myself to covert my NA baby to turbo; I'll buy a turbo Z one day regardless but I love the beefy tone of my NA beast.
 

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85zx:
If you can't find a Z specialist wrecker in Oz then you are not looking hard enough or asking the right people. Z31 are getting wrecked more these days as their market value falls. Manifolds should be no big deal to send through post or courier if required.
NA manifolds tend to crack less than the turbo items so should be more available.

2+2 turrrbo:
From what you describe it is feasible that a coolant leak contributed to the cracking. If you have a watercooled turbo then it is possible that one of the turbo coolant feed hoses was leaking onto the manifold and turbo unit, although the heatshield over the manifold should have offered some protection. A coolant loss would also have contributed to your head gasket failure.
Replacing the cracked parts is the best option. The cast parts may be welded but that should be done by a specialist, and for all the labour involved you may as well fit some good secondhand parts.
 

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I hear ya, there IS a z specialist wrecker interstate I know of but the costs for labour in getting the exhaust manifold changed out just isnt worth it considering it's not an upgrade. The main reason is that I can get the extractors made up for a measly $400 AUD which is far less than what it would cost me to get replacement exhaust manifold. I just figured since they'll have to goto all that trouble taking them out in the first place, might aswell make an upgrade while they're down there. (I obviously dont work on my own car, so labour costs are a big factor).

Something interesting for you; Z31's in Australia are actually increasing in value. Book value on my car was $5,000 AUD 2 years ago, and now it's $7,500 and due to the great condition mine is in I got it insured for $10,000.... They're uber rare here, I think there's like 5 in my whole state alone and they're all beat up and tired as ****. Long live the Z :)
 
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