987 v 986 Air box

[Brad Roberts]

King,

you pretty much nailed it. nearly verbatim to what Porsche has released in factory bulletins!

[Brad Roberts]

That should be interesting. Hopefully it's interesting, anyway

I'm all up for learning Now, sharing what we have learned? Not always

[blue2000s]

Originally Posted by Brad Roberts

I'm all up for learning Now, sharing what we have learned? Not always

That's never a problem for me, I always know all the answers

[Brad Roberts]

I managed to get my hands on an actual Bosch .pdf explaining exactly how the 5.X and 7.X work. I should dig it up and throw it on a server for download. It is the most comprehensive break down I have ever seen published (I just can't regurgitate verbatim)


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[Brad Roberts]

Pushing it to a server now

[Brad Roberts]

I'm only going to leave it up for an hour or so while I deal with a customer. Blue, download it, I'd like to go over some thoughts with you offline.

[blue2000s]

Originally Posted by Brad Roberts

I'm only going to leave it up for an hour or so while I deal with a customer. Blue, download it, I'd like to go over some thoughts with you offline.

Got it. Nice.

[The Radium King]

It all makes sense. But I wonder if the DME just makes small corrections to one load/speed point on the map at a time or if it tries to smooth the map around the point of correction. The O2 sensor isn't fast enough to relay good data while the engine is dynamically changing, like changing loads or RPM. It needs the engine to be steady for a while to know what the conditions are at the intake relative to the exhaust.

Although, I suppose if they charactorized the lag, maybe they've figured out how to use that data too. Maybe.

i doubt that the dme is sophisticated enough to incorporate the 02 sensor lag into analysis, nor to interpolate the curves. rather, i *think* it tends to apply the stft to 'regions' of the maps - idle/coast, under load, wot, etc.

[Marchie]

This is perhaps one of the most interesting threads I've come across, regarding boxsters.
I'm hoping there is more info on this subject to come. Brad is there any more pictures of the air cleaner box after the modification , as it would be very interesting to see, pretty please . It's nice to see for a change no one ********************ing or telling you guys you have done it wrong or you don't know what your doing, lol.
A DIY for this install would be fantastic , and interesting. Keep up the good work.

[Brad Roberts]

Want to know why shop owners stay off the forums? We get tired of being told we are doing something wrong by an armchair engineer who has owned one Porsche and has only worked on HIS car. I speak with Porsche shop owners world wide on a daily basis (and Boxster owners nationwide) I tell everyone to take in all the information you can, but QUALIFY the person giving out the information (what do they do for a living?)

Luckily.. in the Boxster community, you have a LOT of smart people that solve problems!! other Porsche communities are sometimes lacking

In the picture below, we trim off what is the "muffler" We trimmed this first one back a tad too far, but did not get into the actual airbox. After trimming, you will see this "hole" that leads into the air box (or MAF housing)





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[Brad Roberts]

Thanks Flyer!! I didn't decide to take pics of ours until *after* we had cut the box off

[The Radium King]

manufacturers will compromise air/fuel ratios and engine temperature to improve emissions. often the biggest power tuners tout comes from bumping up the rpm limit (if hp is on an increaseing curve, you will get a 'gain' in hp by alowing the curve to travel a bit futher).

[Brad Roberts]

I have 4 CaymanS engines apart right now with the number 6 rod bearing toasted!!! Please please keep raising those rev limiters!! LOL It'll keep me in business longer!!



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[Brad Roberts]

We have already made 345hp with a stock CaymanS engine and I have other shops with 350hp. We made 345 smog legal with all four cats in place.


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[jaykay]

Hmmm yes a little more power just at the top won't help me much.... Yep I know a Cayman guy that looses at least one engine a season.....they dont like over revs.

For those that have the Cayman box ....how is the proper reprogramming for the larger MAF housing accomplished

[Brad Roberts]

Here is what I know:

The 3.2 uses a head nearly identical to the 3.4

The 3.4 makes 300hp stock

The 3.2 makes 250hp stock

Porsche CUTS THE NUTS off of the Cayman's and the Boxster's

If I use the same size exhaust and cats from a 3.4/3.6 on a 3.2 and utilize a 3.4 Cayman Airbox and a 3.4 sized throttle body, I *should* be able to make 300hp out of the 3.2 engine without compromising anything. We have already made 250 with a 2.7 with little to no mods.

3.4 has the 3.2 crank with just smaller pistons in the 3.2
3.4/3.2 cams are identical.. (they say 3.2/3.4 on them)

I have the 3.2 car I'm going to test all of this on, and I have a base tune ready for the car based on a 3.4 tune.

As some of you dig in deeper to the ECU's you are going to see the BIG cam timing difference between a 3.4 996 tune and a 3.2 986 tune. Then again with the 3.4 CaymanS tune and the 3.6 996 tune.


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[jaykay]

Sounds great...Thanks for the feedback

Same heads??? Wow!

Originally Posted by Brad Roberts

Here is what I know:

The 3.2 uses a head nearly identical to the 3.4

The 3.4 makes 300hp stock

The 3.2 makes 250hp stock

Porsche CUTS THE NUTS off of the Cayman's and the Boxster's

If I use the same size exhaust and cats from a 3.4/3.6 on a 3.2 and utilize a 3.4 Cayman Airbox and a 3.4 sized throttle body, I *should* be able to make 300hp out of the 3.2 engine without compromising anything. We have already made 250 with a 2.7 with little to no mods.

3.4 has the 3.2 crank with just smaller pistons in the 3.2
3.4/3.2 cams are identical.. (they say 3.2/3.4 on them)

I have the 3.2 car I'm going to test all of this on, and I have a base tune ready for the car based on a 3.4 tune.

As some of you dig in deeper to the ECU's you are going to see the BIG cam timing difference between a 3.4 996 tune and a 3.2 986 tune. Then again with the 3.4 CaymanS tune and the 3.6 996 tune.


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[Brad Roberts]

From a manufacturing standpoint.. they will only cast a few parts.

CaymanS 3.4 uses 3.6 heads.... (they actually say 3.4/3.6 on them)

So? why would a 3.4CaymanS only make 300hp? when the 3.6 makes 350? (Porsche cuts the nuts off the mid engine cars)



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[jaykay]

Brad

Just thinking out loud. You may have to consider the merits of the 3.4 intake runner and plenum (left and right) acoustic properties to get the 3.2 to breathe.

[jmitch]

Originally Posted by Brad Roberts

Here is what I know:

The 3.2 uses a head nearly identical to the 3.4

The 3.4 makes 300hp stock

The 3.2 makes 250hp stock

Porsche CUTS THE NUTS off of the Cayman's and the Boxster's

If I use the same size exhaust and cats from a 3.4/3.6 on a 3.2 and utilize a 3.4 Cayman Airbox and a 3.4 sized throttle body, I *should* be able to make 300hp out of the 3.2 engine without compromising anything. We have already made 250 with a 2.7 with little to no mods.

3.4 has the 3.2 crank with just smaller pistons in the 3.2
3.4/3.2 cams are identical.. (they say 3.2/3.4 on them)

I have the 3.2 car I'm going to test all of this on, and I have a base tune ready for the car based on a 3.4 tune.

As some of you dig in deeper to the ECU's you are going to see the BIG cam timing difference between a 3.4 996 tune and a 3.2 986 tune. Then again with the 3.4 CaymanS tune and the 3.6 996 tune.


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Brad,

How are you getting 250 HP from a 2.7 with little to no mods? I
have a 2001 and I feel like a moving pylon at the DEs against all the Caymans and 996s in my run group.

Thanks