420A OEM airbox with a turbo?

[DrewmHolland]

I have a 420a with an eBay turbo and I’ve been running a cone style filter just sticking out from my turbo and into the hot engine bay, I know it’s not ideal and since I’m running the factory ecu it’s really not been liking the high intake temperatures (I can feel it pulling timing out on hot days above 90F) I’m really wanting to put an oem airbox back in it for lower IAT’s but what I’m wondering is if it would be too restrictive with the turbo and what my next steps should be if I want a proper cold air intake.

 

[BLACK'98DSM]

The best location for a proper intake is behind the driver fog light hole. That is risky if your area is prone to flooding and the filter will need cleaning more often regardless. That's where I'd put it if I were worried about intake temps though, and I'd also heat wrap the intake piping. I had to wrap it on my Prelude because the heat soak from an aluminum radiator.

I wouldn't say that you can't run the stock airbox, but it is of course far more restrictive. If K&N still makes a panel air filter, I would bare minimum run that.

You may also look into making some sort of sheet metal airbox or divider to keep some heat away from what you currently have. I see the red hot manifold in your picture. You either need a way to keep the heat in there or move the intake further away

 

[DrewmHolland]

I’m getting a turbo blanket so hopefully that helps with the heat soak but I was also thinking about using an inline airbox from a 5.4 triton f150 and putting a duct on it down to the fog light

 

[DrewmHolland]

I just put on my turbo blanket yesterday and the engine bay stays wayy colder now, it also feels like my turbos spool time has gone down, even though it still fully spools at 4000rpm it seems to light up quicker if I’m above the threshold rpm and first gear just spins the tires all the way through now