I've just bought the Autodelta sport air filter via the shop. It says 50% increased air flow and using some kind of logic, that means once fitted, my bhp will go from 150-225 right? They make no claims, but I think they are just being coy.
Seriously though, increased airflow is supposed to increase engine breathing and therefor power, but how much really, 1/2/3 bhp at most, surely?
It probably has the ability to flow 50% more air than the original which is totaly different to increasing airflow by 50%.
On a turbo the maximum airflow is determined by the boost pressure. If the boost pressure is set by the engine management then the total increase in power when fitting a sports air filter will be 0 bhp.
A sports air filter may decrease the drag on the turbo which may make it spin up a bit quicker but in a diesel its already on boost by 1700rpm so its not going to make that much difference.
The best mod to the intake of a turbo car is to get the coolest air possible into the car which increases air density and power.
Run pure oxygen into the intake manifold, and dont allow in any external air. This will be the densest, coolest air you can find. Your car will love it
So will you when you are re-charging the oxygen cylinder every few miles.
And when your cyl head has gone, woah, this is some good ****, power increases ten fold, then your cylinder head has melted and is running down the block.
So, in moderation inject compressed oxygen into the air intake, lean back and enjoy
At most you will feel better throttle response now with your new filter. There will be a definite change you will feel. Great little mod for the price. But the worst culprit is the snorkel which leads to the airbox on the 147. It's ridiculous. It stops air ramming into your engine by having 3 separate chambers which lead to nowhere in order to save fuel.
In my car the air intake-snorkel looks totally different,it is a big hose and it has no cambers or restrictions in it. I donít know how the airbox is looking inside, maybe remove restrictions in there and put in the sportfilter.
Or is it possible to remove the snorkel/hose at al?
As I understood it those chambers are resonators. They're there to reduce the intake sound. Which is a shame if you like the intake sound I suppose
I wouldn't recommend removing the snorkel entirely, coz then you lose your cold-air feed, but it certainly makes sense to replace it with a straight through pipe.
Although, it's possible that this could make your air intake more vulnerable to taking in water, which would be a total disaster, could totally bugger up your engine.
I've considered removing and replacing this part in my 145, but haven't got around to it yet, as it would involve removing the front bumper for me.