Re: whats everyone using for cold air intake on stock turbo
DaveP said:
Nice set-ups, guys. But every pic above picks up under-hood air. Not one of them is ingesting the cooler air that comes from in FRONT of the radiator core support.
While there may be mild benefit from reduced restrictions, any performance gains are probably negated by the increase in temperature. The stock system IS a "cold air" system. The air filter has a duct through the core support, and picks up cooler air.
x2. Particularly, anything on the turbo side of the motor is questionable.
Any gain in flow on that side will be negated by the heat in the area. This is why the KB/ATR kits all attempted to block the fender passages off from heat.
The real downer to the stock setup is that little duct that goes from the filter bracket to the core support... it's really restrictive. You can typically pick up .2 (Mine saw .4 consistently) by cutting the hole larger in the front of the air box, or cutting the front entirely out.
KB's propaganda that the stock crossover was restrictive and heated the air was crap. Unfortunately, the reputation stuck. The real restriction is elsewhere.
A nicely bent (mandrel) oval AL crossover tube would be a good thing.
Best one I've seen used an s-tube that ran from the turbo to the headlight bucket... but you had to pull the headlight to use it. The guys doing fender scoops have a better setup, that way.