Hello everyone,
This is my first post. I just bought my first Porsche (86 Turbo-Look Coupe).

If I modify my airbox (by drilling holes or just cutting it out). This changes the air/fuel mixture right. So does this mean since more air is being sucked in, more fuel has to be pumped in as well. Does anything happen to the economy and or does the car begin to run rich or lean?

 

I haven't heard of people really "drilling" their airboxes on their 3.2 911s. Fabspeed sells cup airboxes for 3.2L motors also and thats pretty much the closest you can get to opening up the air box on it. I have never really heard of any gains. But I have heard good and bad things about cone filters for the 3.2L 911. Good luck and welcome to the board

 

yes, cone filters are bad. They do away with the velocity horn thats mounted on the ait meter and makes the air more turbulent.

Cut out all of your air box cover except for enough of a frame to hold the drop in K&N in place and you will pick up a few HP (i think its like 8hp). the only reason they never did this from the factory is obiviously the noise that it (should) make.

 

Good advice about modifying the stock OEM airbox cover,....the cone filters will reduce HP.

I'd just say that the gains are in the 3-5 HP range.

 

You can also drill five or six 1 to 1 - 1/4 inch holes using a hole saw in the cover. Actually Steve Weiner has suggested this in the past. I did the mod, it sounds cool during acceleration, not much additional noise when cruising and not much if any noticable HP increase...

 

Hey Guys,
Thanks for the advice. I will try the drilling method and hope it sounds good.
But what does this do to the air/fuel mixture and does this effect anything in
engine performance in a negative manner?

 

The computer is smart enough to take care of that.

 

Yep as Randy said, the computer takes care of it. I did nothing to the mixture...

 

You have a good base platform for a bolt-on turbosystem, so make use of those winder fenders and 930 brakes

 

Is there really any gain with stock exhaust etc? Or is it just louder?

Ian

 

Hi Ian:

Here's my "political" answer":........It Depends,....

Assuming you are asking about exhaust modifications, there are some modest gains to be found by installing a good high quality sport muffler such as the Monty Muffler in place of the OEM one. I do not advocate removing the catalytic converter unless its plugged up; Test pipes make more noise than power (unless the cat is plugged).

You can however, make a substantial improvement (where legal) if you install a set of SSI's and a dual-inlet Monty Sport muffler. Thats no BS.