Engine Specific Info and Questions > IDI Engine

Aaz safe boost

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RunninWild:
How much boost can stock internals handle? I just took my taco with a freshly rebuilt aaz with arp head and main studs and its making 34psi with my holset he221w. The thing flies but I think this might be a bit much for it? I'm upgrading to an alh in the near future but I need to sell this without a hole in the block 😂

smutts:
With stock boost about 10 psi max, you must be pretty close! ;)

Close to "Bang!" that is.

I'm the wrong one to ask, as I find walking much slower than a slow, but working, car. ;D

chrisg:
My old AAZ lasted 6 months at 40psi with a t3. But it had stock studs. It suffered the common cyl#3 main rod cap failure. I’ve seen it happen to quite a few. The early 1.9s had weaker mains (so I’m told) and with a lot of boost it tends to crack them and shoot them through the block

Spokerider:

--- Quote from: chrisg on March 04, 2019, 08:55:35 pm ---My old AAZ lasted 6 months at 40psi with a t3. But it had stock studs. It suffered the common cyl#3 main rod cap failure. I’ve seen it happen to quite a few. The early 1.9s had weaker mains (so I’m told) and with a lot of boost it tends to crack them and shoot them through the block

--- End quote ---

 I have acquired an aaz that had exactly this happen to it.
 Big hole in the block.
 What is the likely-hood that the cylinder head will still be ok after this catastrophic failure? I've not disassembled the engine to look yet.

RabbitJockey:
max boost really depends more on the turbo and how much fuel is going with it.

40 psi from a stock t3 is going to be a lot harder on an aaz than an he221

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