Air Intake with no filter

[LazaRs]

Hi all, just wondering if anyone tried to drive the car with no air filter or airbox, just a straight pipe from intake behind the light.
I know that all the Vtec maniac are doing it for a race. just mounting it somewhere that wont suck all the dirt.

What are ur thoughts. i mean the car can take the most air in at that setup? There must be some improvements?

 

[Raptor6767]

A friend of mine with the Civic TypeR EP3 got <5bhp with that setup. We used my girlfriends stockings as a "filter" just in front of his throttle body.


However, I don't know how it would work with our cars and bloody Sagem ECU.

 

[LazaRs]

A friend of mine with the Civic TypeR EP3 got <5bhp with that setup. We used my girlfriends stockings as a "filter" just in front of his throttle body.


However, I don't know how it would work with our cars and bloody Sagem ECU.

Ye but did u drive the car for few hundred miles? Or u just put it and did dyno straight away?

I did it like that just before dyno on my megane 230 and i lost 9bhp? when i just put a cone filter, then i took the car for a ride, for 300km and then came back, and did it and the car did 7bhp more

But then again its a turbo car, but still ECU needs few hundred miles to set the right mixture once it has seen the change in the volume of the air sucked in...

 

[Raptor6767]

Ye but did u drive the car for few hundred miles? Or u just put it and did dyno straight away?

I did it like that just before dyno on my megane 230 and i lost 9bhp? when i just put a cone filter, then i took the car for a ride, for 300km and then came back, and did it and the car did 7bhp more

But then again its a turbo car, but still ECU needs few hundred miles to set the right mixture once it has seen the change in the volume of the air sucked in...

He made ~1-2kkm with it, and then got it on the dyno. Had that setup for months.

 

[Tom]

If you over air the car without mapping it, don't you run the risk of over fuelling?

 

[LazaRs]

If you over air the car without mapping it, don't you run the risk of over fuelling?

You dont, because u have the sensor detecting how much air enters the manifold, and it ECU fixes the mixture but u need to drive the car for a while.
I donno, i am currently building the F7R 2.0 16v engine in the Renault 5 Gt turbo, and the car runs so much better without filter.

 

[Tom]

Ah okay, that's cool. Any other risks??

 

[LazaRs]

Ah okay, that's cool. Any other risks??

The only risk u have is getting all the dirt inside and dust. I gotta try it on my 197. And then go do dyno

 

[ben_r1]

There was a new mercedes truck released a few years ago which had the air pipe riveted onto the back of the airbox. They started failing after a mere 5000 miles due to dust particles being drawn in through the centres of the rivets, for anyone who doesn't know thats about half a mm wide hole.

HGV engines are tough old boots aswell.

Is risking your engine really worth a 5bhp gain you won't even notice? Placebo at the best.