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Originally Posted by cody
I've heard anthing over 15 psi on the stock turbo and your just blowing hot air, but that's just one person's opinion. Blowing hot air just means a less Oxygen...not necessarily more wear on the engine right?
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The problem w/ running a turbo hot is not that you're putting more pressure on the motor's internals so much as you're asking the car not to detonate on a higher temp intake charge.
The hotter the intake charge, the easier it is for the car to pre-detonate when the pistons compress that A/F mixture. That's why we use intercoolers, water/alcohol injection, etc. Gotta get the intake charge as cool as possible, so we can compress as much oxygen as possible to make as much power as possible. If the air is so hot that the car starts pinging, then the ECU has to pull timing to protect the motor, in which case you may be running a ton of boost, but making less power because of the retarded timing.