987 v 986 Air box

[jaykay]

Originally Posted by Frank A

The rate at which the flap opens can be regulated by the diameter of the vacuum line that feeds the flap bellows, larger diameter more volume transfer the faster the valve opens. The vacuum canister should have more than enough capacity to handle this. The plastic lines used currently have a 1mm I.D the combination of the small diameter and the volume air needed to actuate these devices does two things, regulates the time between normal and activated state, and lessens the affect of pressure pulses creating pulsed transition from normal to to actuated.
Besides I have always been a fan of a 2 stroke like power curve, just as long as it is consistent. And I'm the only driver on this buss!

Yes. True I didn't think about the line size and diaphragm diameter...could be okay!

Hey I rode ported and polished RZ-350 for 7 years so I hear yah!

[BYprodriver]

Finally got the 987 airbox & maf tube in & made a hose to connect to 997 plenum & 74mm T/B. Hard to see much of the hose, maybe I can get a better pic on a sunny day. My engine is 3.6L so runs very lean unless maf is disconnected then it runs ok just a little rich. Next is the 996 flash.

[The Radium King]

just thinking a bit here: anyone try to push a 996 flash onto a 3.2 986 that has the larger cayman maf housing? ie, do what you've done but to a 3.2? would really allow you to reduce restrictions in the intake tract, but the maps might be off for the smaller displacement (maf reading would be correct so afrs should be ok)? is there a special flash for the 2004 anniversary edition that had the 3.2 with larger maf housing?

[The Radium King]

I guess an 04 anniversary edition tune wouldn't work as it's a 7.8 dme. still, a 996 tune *might* work - afr's would be fine, maf readings would be fine with a cayman maf housing. I think it would just be a question of the maps being able to deal with the fact that the rpms wouldn't correlate to the amount of air (3.2 vs 3.4 displacement) but I think that there must be enough room in the maps for this, otherwise lne wouldn't be able to say that a 3.6 bore works fine with the oem 3.2 tune (same thing only in reverse).

so, we need someone with a 3.2 to put a cayman airbox and maf housing in their car and push a 3.4 996 tune onto it and see if it runs ...

[onaFLYer]

Originally Posted by The Radium King

so, we need someone with a 3.2 to put a cayman airbox and maf housing in their car and push a 3.4 996 tune onto it and see if it runs ...

That is my most recent plan for my car...though it is not a 3.2 anymore. We tried some updated tunes awhile back to no avail. Currently running an updated stock tune which is better than it was, just not great. Having the car on the road for over a year now, and dealing with various issues from the beginning I'm ready to once again try and make it right. Looking at putting the IPD plenum and a 987 TB on it too.

Will report back once the 996 tune is tried.

[BYprodriver]

Originally Posted by The Radium King

I guess an 04 anniversary edition tune wouldn't work as it's a 7.8 dme. still, a 996 tune *might* work - afr's would be fine, maf readings would be fine with a cayman maf housing. I think it would just be a question of the maps being able to deal with the fact that the rpms wouldn't correlate to the amount of air (3.2 vs 3.4 displacement) but I think that there must be enough room in the maps for this, otherwise lne wouldn't be able to say that a 3.6 bore works fine with the oem 3.2 tune (same thing only in reverse).

so, we need someone with a 3.2 to put a cayman airbox and maf housing in their car and push a 3.4 996 tune onto it and see if it runs ...

I think it would run ok just possibly a little too much cam too early due to the 996 timing. I would have to compare the cam timing differences.

[BYprodriver]

Originally Posted by BYprodriver

Finally got the 987 airbox & maf tube in & made a hose to connect to 997 plenum & 74mm T/B. Hard to see much of the hose, maybe I can get a better pic on a sunny day. My engine is 3.6L so runs very lean unless maf is disconnected then it runs ok just a little rich. Next is the 996 flash.

996 flash works great for the 3.6L, I was surprised how much power this combo added! The intake roar is startling! New dyno test coming.

[Meir]

Originally Posted by BYprodriver

996 flash works great for the 3.6L, I was surprised how much power this combo added! The intake roar is startling! New dyno test coming.

Who did the 996 flush for you if I may ask?

[BYprodriver]

Originally Posted by Meir

Who did the 996 flush for you if I may ask?

I did with my PST2

[Meir]

Originally Posted by BYprodriver

I did with my PST2

good to know you have one

[Paul]

Originally Posted by BYprodriver

I did with my PST2

When I reflashed mine, I got to see some of Porsche's humor while the download was taking place:

[jaykay]

That's harsh ....I think a more encouraging message would appropriate!

[BYprodriver]

[QUOTE=Paul;334848]When I reflashed mine, I got to see some of Porsche's humor while the download was taking place:

Thankfully my 2000 Box IP doesn't have that "big screen" option.