Modified airbox. 3.2 litre
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4th Gear
Joined: Oct 2004
Posts: 4
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From: SF Bay Area
Modified airbox. 3.2 litre
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?
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?
Official Bay Area Patriot
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Fuse 24 Assassin
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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 
Burning Brakes
Joined: Jul 2004
Posts: 1,100
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From: Land of Milfs and honey (SoCal)
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.
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.
RL Technical Advisor
Joined: May 2001
Posts: 11,870
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From: Portland Oregon
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.
I'd just say that the gains are in the 3-5 HP range.
Last edited by Steve Weiner-Rennsport Systems; Oct 11, 2004 at 10:31 PM.
Pro
Joined: Aug 2002
Posts: 686
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From: SLC, UT
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...
Thread Starter
4th Gear
Joined: Oct 2004
Posts: 4
Likes: 0
From: SF Bay Area
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?
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?
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From: Land of the Ptarmigan
Originally Posted by Steve Weiner-Rennsport Systems
I'd just say that the gains are in the 3-5 HP range.
Ian
RL Technical Advisor
Joined: May 2001
Posts: 11,870
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From: Portland Oregon
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.
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.
