More efficient air intake (1.6HDi) - ideas

[Piwoslaw]

Originally Posted by Piwoslaw

Resurrecting this topic, as I came across a thread on the Peugeot forum regarding shortening the unnecessarily long intake path.
308 1.6 hdi air filter relocation
The idea is to use the short intake from Ford CMax with 1.6 TDCi (identical to the PSA 1.6 HDi), so it would look like this:


Unfortunately, the e-HDi is slightly different than the HDi, so the replacement is not a direct fit. I have ordered the part and will see if I can modify it enough to still work.

[Paulbstockton6@hotmail.co]

It might be that engine noise eminated from the simple setup and all those bends and turns muffle intake noise. I would consider insulating your current setup with reflective tape or better. And, if you go the other setup, insulate that..

[freebeard]

Hood blister?

[Piwoslaw]

So I have gone ahead with this mod, now my intake looks like this:


The intake path is now ~30cm, compared to the 150-200cm that snaked its way around behind the engine. This should reduce both restriction losses and intake air temperature.

BUT... The latter only when I isolate the filter from the engine bay. I plan to make some kind of barrier to wall it off from the hot engine bay, so it pulls air from the front left corner.

I had a chance to drive with it while monitoring IAT on the ScanGauge. Ambient temperature was +6C and IAT was 6-7C until the engine warmed up and the thermostat opened. Once hot coolant flooded the radiator the IAT quickly rose to 20-22C

So I won't see the benefits until I can feed it cold air.

[Piwoslaw]

I made a box for the new filter, which will allow it to take cooler air from the left side of the engine bay, instead of pulling hot air from the engine and radiator.
I used a piece of coroplast:




I used shiny-sided bubble wrap on the outside of the box to insulate it and to reflect the heat from the radiator:


The effect is noticeable: Now even when the thermostat opens the intake air temperature barely rises, no more than 1 or 2 degrees C above ambient while driving.