Quote:
Originally Posted by 1slow370
tubular manifolds love to crack unless they are really high grade stuff, like welded iwth the pipes back flushed with shield gas using the proper rod with all the same grade of stianless for the parts (at the very least 304 or better). the head flange needs to have all the runners divorced so it can move around as it heats and the wall on the tube needs to be thick enough to fully support the turbo under these conditions. also it is going to dump more heat into the engine bay in a very tight area next to a bunch of stuff that doesn't like to get hot. This is why sets for the 350z cost upwards of $1600. Just throwing that out there.
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Yup.
You need good quality tubing, with proper filler rod. The most important thing is back purging with argon, or another inert gas as well as a good gas lens for the tig torch.
I had a local customer who brought in a $1100 FD turbo manifold that was built out of SCH 10 pipe (nice and strong). The welding process was all wrong though. The manufacturer did not back purge and then did not weld with full amperage...the manifold was cracked in about 5 places after 6 months of use.
I re-did every single weld on the manifold (using proper welding procedures)...no issues with it after 3 years of abuse.