How Difficult to R & R Air Box

[flmont]

I want to get to Fuel injectors and rails,harness Etc So Is it really hard to R&R the Air Box,..from the cold air intake and 987 air box mods..its said its a real pain ? Thanks Frank

[maytag]

Originally Posted by flmont

I want to get to Fuel injectors and rails,harness Etc So Is it really hard to R&R the Air Box,..from the cold air intake and 987 air box mods..its said its a real pain ? Thanks Frank

Yes.... serious pain in the arse. Im not sure i'd do it again without lowering the motor first.

Seriously; it's that bad.

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[thstone]

Originally Posted by flmont

So Is it really hard to R&R the Air Box,..its said its a real pain

Its a real wrestling match and I got my ass kicked.

Like you, I wanted to get to the injectors and fuel rails. I spent hours removing everything that I could to get enough room and was still never able to get the stock airbox out. In the end, I gave up on the airbox and just removed the injectors with the air box still in there. I hate that f%&*cking thing.

Final Score
Stock air box = 1
Stone = 0

[flmont]

Oh Wow,..That's disappointing ok,..well maybe Ill pull the Intake instead I have the 2 center pieces out anyway so 6 more bolts I think...Thanks Frank

[aparke4]

I am about to install a 911 plenum and 3 inch silicone hose section a new "cold air intake" with an inline air canister filter... from what i have read is that it is nearly impossible to salvage the 986 box and the easiest way since i do not plan on putting it back ever again is take vice grips and break the box in sections till you can get to the bolts. Takes about 15 minutes and I am salvaging the MAF sensor tube so that is the only area i need to be careful around.

[maytag]

Originally Posted by aparke4

I am about to install a 911 plenum and 3 inch silicone hose section a new "cold air intake" with an inline air canister filter... from what i have read is that it is nearly impossible to salvage the 986 box and the easiest way since i do not plan on putting it back ever again is take vice grips and break the box in sections till you can get to the bolts. Takes about 15 minutes and I am salvaging the MAF sensor tube so that is the only area i need to be careful around.

Are you planning to use the 986 MAF housing with your new plenum? Are you staying stock tb?

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[aparke4]

Originally Posted by maytag

Are you planning to use the 986 MAF housing with your new plenum? Are you staying stock tb?

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Yes keeping stock MAF housing/ cutting right up to stock air box for use with rest of 3 inch piping (there are some aftermarket alum MAF housing kits but i found a lot of mixed reviews on the quality of the alum)... and I have a cayman/ 911 (996) TB that is 74mm i believe that bolts onto the plenum.

I am also installing a oil catch can in the trunk in line with the stock AOS (replacing that as well for prev. main.) as my boxster just crossed 96k (2002 S)

[aparke4]

You can see here where to cut up against box... the only thing i might add is a honey comb inset to protect MAF... also installing a new MAF (bosch/ OEM) again for maintenance... need a tune or remap to tie it all together!

[maytag]

Originally Posted by aparke4

Yes keeping stock MAF housing/ cutting right up to stock air box for use with rest of 3 inch piping (there are some aftermarket alum MAF housing kits but i found a lot of mixed reviews on the quality of the alum)... and I have a cayman/ 911 (996) TB that is 74mm i believe that bolts onto the plenum.

I am also installing a oil catch can in the trunk in line with the stock AOS (replacing that as well for prev. main.) as my boxster just crossed 96k (2002 S)

If your intake tube/ plenum and TB are all breathing through a smaller-diameter MAF housing (the OEM MAF hsng) you may be disappointed. Have you considered that?

I'm all about the mod, don't misunderstand. But I'm not sure it makes a ton of sense to do what is clearly a PITA mod, just to neck-it-down and let it keep breathing through the OEM MAF Housing.

If you increase the volume on the front end, then neck-it-down at the MAF, you may get some increased velocity over the MAF. But then you dump it back out into a larger-volume space (your larger plenum), you'll find reduced volume AND velocity. And likely some unwanted turbulence as well, right in front of your TB.

just food for thought.

[Starter986]

That pipe/hose coming out the bottom of the housing...

What is that for? To what is connected? What is the purpose of it?

Thank you.

[maytag]

Originally Posted by Starter986

That pipe/hose coming out the bottom of the housing...



What is that for? To what is connected? What is the purpose of it?



Thank you.

Drain

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[flmont]

Is it possible to loosen the bolts on the air box to then move it around enough to get to the fuel rail,.?? Thanks

[maytag]

Originally Posted by flmont

Is it possible to loosen the bolts on the air box to then move it around enough to get to the fuel rail,.?? Thanks

I.d say yes, since I had the fuel rail unbolted and was moving it around as I was trying to get the airbox out.

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[Starter986]

Originally Posted by maytag

Drain

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. . .

Thanks!

[aparke4]

Originally Posted by maytag

If your intake tube/ plenum and TB are all breathing through a smaller-diameter MAF housing (the OEM MAF hsng) you may be disappointed. Have you considered that?

I'm all about the mod, don't misunderstand. But I'm not sure it makes a ton of sense to do what is clearly a PITA mod, just to neck-it-down and let it keep breathing through the OEM MAF Housing.

If you increase the volume on the front end, then neck-it-down at the MAF, you may get some increased velocity over the MAF. But then you dump it back out into a larger-volume space (your larger plenum), you'll find reduced volume AND velocity. And likely some unwanted turbulence as well, right in front of your TB.

just food for thought.

Great point! I was under the assumption the MAF housing matched the 74mm TB/ should be right at 3 inches. Is the stock MAF housing on the air box smaller?

[flmont]

is loosening the air box the best way to remove and replace the injectors,..Iam pulling them for testing.? Thanks

[maytag]

Originally Posted by aparke4

Great point! I was under the assumption the MAF housing matched the 74mm TB/ should be right at 3 inches. Is the stock MAF housing on the air box smaller?

Yes.
I don't remember the actual measurements I took as I was assembling, but the O.D. of the 986 MAF housing is the same size as the I.D. of the larger intake & TB.

So then you're faced with a dilemma: use the 986 MAF anyway, which negates the benefit you've tried to create. Or use the 987 MAF housing, which is what I've done. I'm not yet 100% certain I'm glad I did. This spring I'm going to go get a flash to an '04 anniversary edition, which used the larger MAF housing. I'm hoping that'll cure some things. It definitely runs fat right now, and I'm hoping that cures it.
Otherwise, this gets chalked-up as "modifications for the fun of modifying". Hehe

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[aparke4]

Originally Posted by maytag

Yes.
I don't remember the actual measurements I took as I was assembling, but the O.D. of the 986 MAF housing is the same size as the I.D. of the larger intake & TB.

So then you're faced with a dilemma: use the 986 MAF anyway, which negates the benefit you've tried to create. Or use the 987 MAF housing, which is what I've done. I'm not yet 100% certain I'm glad I did. This spring I'm going to go get a flash to an '04 anniversary edition, which used the larger MAF housing. I'm hoping that'll cure some things. It definitely runs fat right now, and I'm hoping that cures it.
Otherwise, this gets chalked-up as "modifications for the fun of modifying". Hehe

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Yes it does- I need a remap as well... just one more thing to add to the list of fun mods!

Thanks for the info^