Question about air-intake on Fabia TDi?

[Fabia RS]

Hi, I was wondering if any of you techies outthere could give me an explaination on, why the air-intake on the Fabia TDi (I don't know if it's the same on Octavia) is partly open, so it allows some of the air into the engine bay, rather than all of it into the airbox?

I guess there is a logical explaination for it, I just can't see what. Personally I have mine sealed off (only the engine bay hole), to allow more air into the airbox.

The only problem is, that you have to clean the airfilter very often, because of insects and and other things blocking the filter. But it's worth the extra boost you get from forcing more air into the engine.

[Neo_VR]

Do you find it gives an increase in performance?

on the diesel engines, airfilter is only changed @ 40k, so it is probably to stop crap being sucked in.

[Fabia RS]

Originally Posted by Neo_VR

Do you find it gives an increase in performance?

I felt an increase in acceleration, so I think it helps build up presure faster in the turbo.

Originally Posted by Neo_VR

On the diesel engines, airfilter is only changed @ 40k, so it is probably to stop crap being sucked in.

That was my first thought too, but I don't know for sure.

[devonutopia]

Originally Posted by Neo_VR

on the diesel engines, airfilter is only changed @ 40k, so it is probably to stop crap being sucked in.

Really? Had mine done at 20k - seems every 20k is the fuel/air/oil filter changes on mine. Interesting to see what the MAF makes off all the extra air being forced in.

[skomaz]

Originally Posted by Fabia RS

I guess there is a logical explaination for it, I just can't see what. Personally I have mine sealed off (only the engine bay hole), to allow more air into the airbox.

Someone can correct me if I'm wrong but my guess would be to stop water ingress into the intake when driving in rain. I think the intake slopes upwards from the grille and the opening is at the bottom so any water being forced into the intake will hit the side of the intake (it's heavier than air so won't be diverted along the intake) and will then drain out through the opening.

[Lummox]

Originally Posted by devonutopia

Really? Had mine done at 20k - seems every 20k is the fuel/air/oil filter changes on mine. Interesting to see what the MAF makes off all the extra air being forced in.

Oil filter every 10k
Fuel filter is 20k
Pollen filter every 20k
Air filter every 40k

[Fabia RS]

That's exactly it, -more air being forced in will also mean, the MAF will allow more fuel to be injected.

Before I altered my air-intake/airbox, I did some reading on airflow/airpresure on turbo-engines, and according to my understanding there are several things that will make the engine perform better:

1. Quicker airflow
2. Cooling the airflow
3. More presurized air being forced into the engine (pre-turbo like)

You can also get special air-intakes that supposely will help build up presure in the intake. But I prefer to keep everything as original as possible.

I have altered mine the following way:

I have closed off the air-intake so air is being forced into the airbox, rather than sucked in.
I have changed the filter with a K&N filter replacement to fit the original airbox.
I have isolated the inside of the airbox with heat-resistant thermo-blanket,
I have also wrapped this thermoblanket around the back of the air-intake and pipe, which leads the air to the airbox (because the engine actually heats up the air quite a lot, because of the airpipe running so close to it).

My engine was meassured 2 weeks ago, and it had 155 BHP without any remap

[ScoobyChris]

And if you're on a small budget you can always use SPT

Chris

[Alex]

SPT is good don't knock it

[Fabia RS]

Originally Posted by ScoobyChris

And if you're on a small budget you can always use SPT

Chris

I do detect some sarcasme here

Modding is fun, -cheap modding is cheap fun, or just plain cheap