987 v 986 Air box

[Brad Roberts]

I highly suggest the IPD and CAYENNE V8 throttle body (much cheaper than the GT3 and its the same size) All those people buying the "GT3" throttle body are being raped.. LOL The V8 throttle body has the connector oriented just a tad different than the actual GT3


B

[onaFLYer]

Originally Posted by Brad Roberts

I highly suggest the IPD and CAYENNE V8 throttle body (much cheaper than the GT3 and its the same size) All those people buying the "GT3" throttle body are being raped.. LOL The V8 throttle body has the connector oriented just a tad different than the actual GT3


B

Thanks for the tip, nice of you to share all this info for us & me. Any year Cayenne V8 will work?

[Brad Roberts]

948.605.115.03

Don't laugh.. full pop retail from Porsche is .....


$284.00


I'm very lucky that I'm exposed to a LOT of Porsche cars/parts. It takes a VERY long time to learn this stuff.



B

[Paul]

[onaFLYer]

so I finally got to drive my car again, first impression of the 987 air box is a plus. Makes good sounds too. I will have a final install pic in a new post with all my engine mods to date soon. Need to break in the engine first, but I can tell already that it rips!

[jaykay]

Congrats!
Are you able to say whether the DME properly adapted to larger MAF housing diameter?

[onaFLYer]

Originally Posted by jaykay

Congrats!
Are you able to say whether the DME properly adapted to larger MAF housing diameter?

Not yet, it was a short drive of about 2.5 miles. Had to unplug the maf, seems to have failed since it was siting in the garage.

[Marchie]

Thanks for the update, look forward to your next report. Keep up the good work.

[Brad Roberts]

Lots of good parts left on that wreck!! Paul doesn't say much does he?


B

[Paul]

Originally Posted by Brad Roberts

Lots of good parts left on that wreck!! Paul doesn't say much does he?


B

I offered him $100, he said no and countered with $200. No sale....YET.

BTW I posted the pictures in hopes you could better show us where to make the cuts.

[onaFLYer]

Originally Posted by Marchie

Thanks for the update, look forward to your next report. Keep up the good work.

Ordered a MAF off ebay, I should know better, wrong part and its used. Drove it on the highway first time anyway, pulls real well. Still waiting to have the proper MAF installed, then I will follow up again. Snow this week.....

[Marchie]

Hi Once,
What about trying your old Maf sensor from the 986 airbox. I thought I saw Brad say you should use it and that it fits. Just a thought. Brad has been quiet on here of late, I hope he's ok.

[onaFLYer]

Originally Posted by Marchie

Hi Once,
What about trying your old Maf sensor from the 986 airbox. I thought I saw Brad say you should use it and that it fits. Just a thought. Brad has been quiet on here of late, I hope he's ok.

I did try that, it fits the same yes. Turns out the tube is too big for the DME to compensate for it, so I stuck some foam in there to reduce the size a little. Seems to be working so far, no CEL.

[Marchie]

Hi,
Just to clear something up for me, if I put the 987 airbox on my 986 2.7 , I can still use my existing maf sensor on the new larger maf housing with no problems ?
My plan would be to do the airbox, ipd plenum and larger 74 mm throttle body. Can anybody see any issues here and would I have to do any exhaust mods to compliment this. Mine is stock apart from a sport muffler( silencer) . In Australia we don't have the pre cats either just the rear ones. I would appreciate any opinions , within reason, lol.
Thanks.

[berty987]

To be honest I would fit the 996 3.6 inlet tee rather than the IPD plenum to mount the 74mm throttle body and then fabricate my own hose to connect to the airbox via the MAF. The IPD plenum is an unearthly cost and gives very little benefit in its own right. Ideally i'd suggest the MAF should be the later type in the larger housing , but this requires reconfiguring in the DME I believe. With the original MAF and housing you risk the MAF becoming a restriction and ofsetting any gains from fitting the larger throttle body and plenum. The MAF will have a set range its allowed to accept in the DME, force too much air through it and the DME can throw a fault ,though i've only ever experienced it on a tubo car. good luck with hte mods , it would be interesting to see the result you come up with.

[onaFLYer]

Originally Posted by berty987

Ideally i'd suggest the MAF should be the later type in the larger housing , but this requires reconfiguring in the DME I believe. The MAF will have a set range its allowed to accept in the DME, force too much air through it and the DME can throw a fault ,though i've only ever experienced it on a tubo car.

This seems to be the very problem I am having with my 987 box in my 986.

The MAF has the proper voltage, but I keep getting a CEL for MAF. And I cant get it smogged as a result. I started another thread trying to explore all of this.

[jaykay]

Originally Posted by Paul

This box looks a little squarer at the back than others I have seen. It may fit better. Different model?

Perhaps it is my imagination!

[jaykay]

Brad,

What does the end treatment of 987 airbox look like and can it fit up to a smaller bosh (3" dia) MAF housing?....well without it looking like a boch job and introducing losses. It may be a good set up for those not running a custom tune (3.4)

j

[tightbox]

Standard 987S airbox, and generic 3.5" silicone TB hose both from ebay IIRC.

[berty987]

Not sure the 986 or 987 3.2 or 2.7 will benefit from the 82mm tb of the 997 carrera 3.8/gt3 . There was a guy that tried it over in australia and he thought it actually lost power. Fitting the 74mm unit with a silicone intake and cone filter is probably the best solution for a 986 , as removing the air box is much easier than on a 987. The 986 definitely has a stunted performance from the smaller air box and media area , hence the 986 550 anniversary gained power from simply fitting the 987airbox and filter but keeping the 68mm tb. The later 987. 3.2 and early 2.7 987 both used the 68mm tb from the 986. The later 987 M97 engine 3.4 and 2.7 used the larger 74mm throttle body. There is a thread running on planet-9.com relating to a cold air silicone hose and cone filter upgrade for the cayman that suggests significant gain over the 987 air box. This may be worth considering as an alternative to the hassle of buying and fitting the 987 air box to a 986. There may be issues with the maf housing diameter as the 987 uses a larger size and a different type of sensor I believe.