Air Box Mods

DBF · 10-19-2002, 11:44 AM

What is the general feeling about swiss-cheesing air boxes? I punched mine out yesterday and found a slight to moderate increase in throttle response. Theoretically this should happen, with a larger volume of air allowed to enter the intake.

Dan

furiousgeorge · 10-19-2002, 01:24 PM

I wont swiss cheese my air box, but I was wondering how hard it would be to basically turn the air box upside down, and put some sort of intake on the hood. Looking at the intake for my buddies thunderbirt turbo coupe gave me the idea. I think the hard part would be moving the fuel injection stuff. Theres a air flow valve/sensor in there somewhere, would it work upside down?

CGTBrad · 10-19-2002, 02:21 PM

IIRC it is closed by gravity. You might be able to flip it and work out some elaborate spring mechanism to simulate gravity, probably would not work quite right still. I think there is some other stuff in the CIS system that has to be upside right to work...

Supercoupe · 10-19-2002, 05:25 PM

As long as you didn't swiss cheese the side near the engine it will increase your performance. If you opened up the box on the motor side instead of the fenderwell side you will be sucking in hot air, which is okay this time of year but when it gets hot again in the spring the hot air will decrease your power.

Cdn Blue Coupe · 10-19-2002, 06:28 PM

I've found that if i take off the exhaust pre-heater and removed the thermostat valve
and the fender intake I get a wonderful sound under full throttle.
I also added a heat shield so I'm sucking cool air from the grill
Like you I find an improvement but its marginal. but for the sound,,,,, what the hey, and I've kept the parts so can put it back when ever I want. BTW Ithink there are minimal gians ( if any) for the swiss cheese aproach. my way I mor than double the intake area witht he two openings and especially the flapper removed.
what are the other experiences out htere?

kikincgt · 10-19-2002, 08:00 PM

Was Wondering about how to swiss cheese the airbox or if theres been any forced piping air mods made for the cars want to do intake this week.
Scott

Audi[VW]EuRo_StYLe] · 10-19-2002, 10:43 PM

is the fuel management computer able to correct the gas to air mixture ratios on these cars?

more air requires more gas.

DBF · 10-20-2002, 03:03 AM

There is no fuel management computer on '82 vintage cars that I am aware of. It is not something to worry too much.

furiousgeorge · 10-20-2002, 06:30 AM

I would take the cover off my airbox and figure something out, but its so damn hard to do!

Cdn Blue Coupe · 10-20-2002, 10:00 AM

Our cars whether 4 or 5 cylinder have a CIS or CIS-e system which uses a air mass sensor (the flat paddle) so the more air the more fuel and it is able to compensate for all conditions and as such suits (most) mods to the engine very well up to its fuel supply limits. Opening the air box will not come anywhere close to these limits.

10-19-2002, 01:24 PM	#2
furiousgeorge AudiWorld Senior Member Garage is empty, add now Join Date: Jul 2002 Posts: 921	Re: Air Box Mods I wont swiss cheese my air box, but I was wondering how hard it would be to basically turn the air box upside down, and put some sort of intake on the hood. Looking at the intake for my buddies thunderbirt turbo coupe gave me the idea. I think the hard part would be moving the fuel injection stuff. Theres a air flow valve/sensor in there somewhere, would it work upside down? __________________ "So your reasoning here (sorry about being off topic but this demands further discussion) is that if you have a pole in house, it will attract pole dancers. Have there been any studies on this, could it really work? My God, could it really work?"

10-19-2002, 02:21 PM	#3
CGTBrad AudiWorld Super User Garage is empty, add now Join Date: Jul 2002 Posts: 8,994	Air flow valve would not work upside down without major mods... IIRC it is closed by gravity. You might be able to flip it and work out some elaborate spring mechanism to simulate gravity, probably would not work quite right still. I think there is some other stuff in the CIS system that has to be upside right to work... __________________ ---------------------------------------- Brad B. Nashville 1987.5 CGT 2.3 Special Build 2001 TT 225

10-19-2002, 05:25 PM	#4
Supercoupe AudiWorld Senior Member Garage is empty, add now Join Date: Jul 2002 Posts: 1,568	Re: Air Box Mods As long as you didn't swiss cheese the side near the engine it will increase your performance. If you opened up the box on the motor side instead of the fenderwell side you will be sucking in hot air, which is okay this time of year but when it gets hot again in the spring the hot air will decrease your power. __________________

10-19-2002, 06:28 PM	#5
Cdn Blue Coupe AudiWorld Senior Member Garage is empty, add now Join Date: Aug 2002 Posts: 1,326	Re: Air Box Mods I've found that if i take off the exhaust pre-heater and removed the thermostat valve and the fender intake I get a wonderful sound under full throttle. I also added a heat shield so I'm sucking cool air from the grill Like you I find an improvement but its marginal. but for the sound,,,,, what the hey, and I've kept the parts so can put it back when ever I want. BTW Ithink there are minimal gians ( if any) for the swiss cheese aproach. my way I mor than double the intake area witht he two openings and especially the flapper removed. what are the other experiences out htere? __________________ <font color="blue"><big>Cdn Blue Coupe</big> </font> 85 Coupe GT, 2.2 kx, custom cold air intake suspension by boge 87.5 tornado red cancer coupe "who doth givith his organs so that his brothers may live"

10-19-2002, 08:00 PM	#6
kikincgt New Member Garage is empty, add now Join Date: Feb 2002 Posts: 185	Re: Air Box Mods Was Wondering about how to swiss cheese the airbox or if theres been any forced piping air mods made for the cars want to do intake this week. Scott

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10-19-2002, 10:43 PM	#7
Audi[VW]EuRo_StYLe] New Member Garage is empty, add now Join Date: Aug 2002 Posts: 416	If the box is cut, or is moded for more air intake.... is the fuel management computer able to correct the gas to air mixture ratios on these cars? more air requires more gas. __________________ 1986 Audi Coupe GT (Commemerative Edition) -Sound: Alpine 4" in front, Alpine 6x9" in rear, Alpine 200Watt Amp powering Kenwood 12" Subwoofer (in custom box) -future objectives: - performance coils - 16" Rims - restore the original red leather

10-20-2002, 03:03 AM	#8
DBF Junior Member Garage is empty, add now Join Date: Aug 2002 Posts: 775	Re: If the box is cut, or is moded for more air intake.... There is no fuel management computer on '82 vintage cars that I am aware of. It is not something to worry too much. __________________ Dan '82 Coupe-SOLD '86 Scirocco 8V '07 Dodge Caliber SXT '89 F150 XLT 4X4 '06 Buell XB12Ss

10-20-2002, 06:30 AM	#9
furiousgeorge AudiWorld Senior Member Garage is empty, add now Join Date: Jul 2002 Posts: 921	drats! I would take the cover off my airbox and figure something out, but its so damn hard to do! __________________ "So your reasoning here (sorry about being off topic but this demands further discussion) is that if you have a pole in house, it will attract pole dancers. Have there been any studies on this, could it really work? My God, could it really work?"

10-20-2002, 10:00 AM	#10
Cdn Blue Coupe AudiWorld Senior Member Garage is empty, add now Join Date: Aug 2002 Posts: 1,326	Fuel management Our cars whether 4 or 5 cylinder have a CIS or CIS-e system which uses a air mass sensor (the flat paddle) so the more air the more fuel and it is able to compensate for all conditions and as such suits (most) mods to the engine very well up to its fuel supply limits. Opening the air box will not come anywhere close to these limits. __________________ <font color="blue"><big>Cdn Blue Coupe</big> </font> 85 Coupe GT, 2.2 kx, custom cold air intake suspension by boge 87.5 tornado red cancer coupe "who doth givith his organs so that his brothers may live"

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