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.



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First drive
 

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! :cheers:

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.

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

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


B

MAF issues
 

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.....

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.

Any thoughts in putting the rest of the Cayman intake in right up to the diverter tee? How could one run the diverter flap? I suppose a Cayman tune would be needed...

THolyoak used this airbox on my M97 3.8 986 swap back in '09. He said at the time that no modifications were required to get it to fit in the chassis.

Would I gain anything by bypassing the referenced "muffler," or does that just alter the sound?

I am running the 3.6X51 DME map (as it is the largest engine size that was available on a "stock" Porsche 7.8 DME tune/map). Always wondered what I am leaving on the table by not getting it professionally tuned.

I also have a 3.8 IPD kicking around that I never tried. Any ideas if these two mods would give significant gains? He thinks/thought "no" at the time I picked the car up back then.

Nice looking installation! How much did that set you back? If the muffler fits in your bay I would worry about it....I had thought it would only go in a 987 or was there a special 550 spyder edition box that you put in?

I was specifically referring to the Cayman diverter tee and how to make it work on a 3.2 M96.

Where did you get the hose on the tb ....looks like a good fit

Any updates, gentlemen?

I think we are still working out MAF housing issues. Still trying to put my hands a reasonably price air box and MAF housing from there I will be able to see what can be done

It looks like hell to get the old box out and the 987 in!

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!

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

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

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.

Yes well put...welcome to my world! I am wrestling with this right now. I have the 74 tb and plenum in place but I am trying to determine the real merits of the 987 box over making my own intake, sealed to the scoop of course. Making your own is much, much less hassle. I was suprised to see the Caymans making more power with the cone. Perhaps it is down to the filter element itself.

The main advantages of the 987 box are the huge intake area of the snorkels shaped to the scoop and box volume. There must be some hard to see restrictions inside the box. Actually this huge snorkel may be of use in making my own intake....running to the drawing board now!!

I personally believe the 987 OEM filter has one big advantage in that the larger filter area over the 986 (14.5 sqft vs 6.1sqft) not only gives a lower pressure drop but also a significant longevity to the element. In other words the element maintains the benefits of the lower pressure drop for a sustained period as it takes longer for the element to be come contaminated and restrictive. This type of cone filter is normally used in race applications where the filter is either replaced or cleaned and re oiled after a relatively short period (ie one race).
Providing the cone filter can be located somewhere accessible and the owner is happy to clean the element frequently , the next issue is contamination of the MAF from oil carry over. An air box and indirect route to the MAF should reduce some of the risk of oil contamination as the oil will drop out of suspension in the air at lower velocities where the diameter of the air tract increases and velocities reduce. A silicone hose direct from the inlet cone filter doesn't allow the velocities to drop so the MAF is more at risk from contamination. I believe there were revisions on the MAF design on both the 986 and between 986 and 987 whereby additional screens were placed in front of the element on the 987 to protect it.
Of the cone element installs I've seen , they all seem to rely on removing the baffle plate in front of the air box to give better flow. Whilst this does indeed work it also increases the risk of water droplets getting onto the MAF or in extreme cases making
the filter wet and losing capacity.
I think that to make a satisfactory street version of an intake system all these elements need to be considered. If the aim is purely to make a track orientated modification then a cone filter and silicone tube will give the best results for minimum outlay.

Yes the 987 filter is massive; the biggest I have seen. I think if you were to adapt a smaller MAF housing to it, the cumlative losses would still be a lot less. I believe that large volume airbox designs are considered to be the most efficient perhaps because they have a huge volume of high static pressure air to draw on right before the filter. I am not sure high velocity all the way is the best thing. It is just that this 987 air box set up has a MAF housing dia that my DME may not be expecting.

I am not sure I understand what you term the baffle plate....the air box wall at the end of the scoop air duct?? I personally would not put an unprotected cone in the air duct for the reasons you outlined. I had envisioned a snorkle or duct sealed in scoop air duct via a "baffle" plate or heat shield. There would be no air injestion from the engine bay. There would be a 90 degree bend to knock out water leading, uphill to a sealed BMC oval trumpet or CDA airbox. The MAF housing could be placed behind another 90 to further protect the sensor. The filter would be accessible in the engine bay. I have yet to hear anything substancially negative about the BMC air box set up be it maintenance or performance. I imagine the filtering would not be as good as paper elements.

Yes I believe there have been revisions the sensor but you need the DME update from Porshe to run them. They may ruin you custom flash if they hook there diag. tools.....I am not sure of the cost of this update. So I guess you need to be working with a stock flash to get the updated more robust sensors.......

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.

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.

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.

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.

Hi Ona,
I'm glad it's at least working even though it's probably not exactly as planned.

Passed the smog test, removed the large foam and replaced it with a much smaller one. All good now. :cheers:

I just got my 987 airbox in the mail the other day. I am waiting to take my hardtop off to tackle trying this box out. I think it will be a good addition to the 3.4 in there now. I will take photos and keep people up date if anyone would like. :)

Wear gloves, this job will slice up the backs of your hands!

Thanks for the thought of my hands. I am going to pull the intake manifold on that side and then there should be no worries of the hand mashing. :cheers:

Just finished modding two boxes. One is going in the 3.2 I mentioned early. I'll go to dyno this week with the car.

I found something else interesting during all this that I'll share this week also.

The MAF you want to run is the .125.01

Yeah, I"m interested keep us updated. It's all interesting JAAY & Brad

Thats the one I used also. Works great.

The one from the 987, not so much.

Brad. Why the .125.01? I mean what is saying to you better or not? Better afrs?

The 125.01 is the updated MAF that we all run in all of our FBW cars. It appears to be a more robust MAF, that is less prone to failure than the 125.00

I have been told numerous times that it needs "programming" to work, but I haven't seen a need in the last 4 years we have been selling them.

The engine is going in the -S today. We finished the engine build on Sat.



B

Command decision made:

If we are going to install a 987 air box.. why not switch it over to the larger CaymanS 3.4 throttle body :)



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