Where does the OEM cold air intake route?

[m1tch]

Hi all,

Just looking at intake setups on my project car, with an open filter in the engine bay the intake temps are at 60c after a drive and then sitting on the driveway, with the stock airbox and brake duct pipework its at around 37c so much improved.

I pulled off the passenger side vent yesterday and noticed that the vent just goes directly into the back of the engine bay, I could see that there was a cutout for the fuel filler - is this where the stock intake tube gets its air from?

Just wondering as I can't see any way to remove the OEM pipe without removing the whole rear quarter, does the cold air feed connect to the side vent or does it just suck in air from around that area?

If it is taking air from the side vent then to increase airflow to the airbox is would be a simple matter of plugging up some of the vent portion that goes into the back of the engine bay which seems to just cool the back of the battery and some wiring?

Has anyone got a photo of the OEM routing and pipework without the bodywork?

[Slipsliderg]

I should be able to get one later today as I have a stripped on shell in my drive, but the ducts are still there.

[m1tch]

I should be able to get one later today as I have a stripped on shell in my drive, but the ducts are still there.

Awesome, its not something I can pull out and I am guessing it might all be one piece but its under the bodywork etc.

[m1tch]

Looks like it attaches somewhere in the passenger side wheel arch....why not the huge side intake!

 m http://www.driftopia.com/2008/02/06/mr2 ... heel-well/ m

[SteveJ]

Take the battery out and you'll see the open end of the pipe. At a guess it's done like that to avoid ingesting too much water.

[m1tch]

Take the battery out and you'll see the open end of the pipe. At a guess it's done like that to avoid ingesting too much water.

Point taken, will pull the battery and see if there is a better or alternative route or indeed any possible increase in duct diameter.

[SteveJ]

Take the battery out and you'll see the open end of the pipe. At a guess it's done like that to avoid ingesting too much water.

Point taken, will pull the battery and see if there is a better or alternative route or indeed any possible increase in duct diameter.

The duct is already larger than the diameter of the pipe where the MAF is mounted so no real room for improvement without changing the MAF mount & then using a re-mappable ECU. There are more significant gains to be had elsewhere!

[shnazzle]

Agreed.
But if you're intent on having the noise, but the filter behind the battery.

The stock system from from vent, to behind battery, to a pipe that sits in your nearside rear quarter panel, then comes out behind the nearside taillight. That connects to a 65ish deg pipe with a funnel effect, which then connects to the airbox.

Remember the engine sucks air. There is no ram air potential here. The only "ram" effect you're going to get is through pulses (as explained by ChrisGB I believe it was) so the idea is to make sure the engine can suck as much as it needs as quickly as it can.

That's pretty much achieved with the stock system and sports panel

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[m1tch]

Agreed.
But if you're intent on having the noise, but the filter behind the battery.

The stock system from from vent, to behind battery, to a pipe that sits in your nearside rear quarter panel, then comes out behind the nearside taillight. That connects to a 65ish deg pipe with a funnel effect, which then connects to the airbox.

Remember the engine sucks air. There is no ram air potential here. The only "ram" effect you're going to get is through pulses (as explained by ChrisGB I believe it was) so the idea is to make sure the engine can suck as much as it needs as quickly as it can.

That's pretty much achieved with the stock system and sports panel

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Hmm I see the point about the rest of the pipework being the same size or larger than the OEM MAF pipe meaning that the pipework will always flow more than the MAF can handle.

I am not really after noise with the filter behind the battery but more about a shortest intake path which would help throttle response - so the engine isn't trying to suck through a long straw.

I guess the OEM system was pretty much spot on, and the panel filter just helped bump the airflow up a bit for any aftermarket parts, will leave it as is for the time being I think.

[Slipsliderg]

Here you go Mitch, just behind the fuse box second last and last photo.

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