Finally: Dyno charts of de-snorked 986S!!!

[xclusivecar]

@ Everyone-- Lets just all de-snorkel and be happy for the great sounds we have just unleashed and the possibility of 1-2% more HP ±2% of that HP.

@ All the engineers-- These debates make the common man (myself) just smile. I have no idea what is being debated, yet love the fact that it is! Keep it up everyone!

[MNBoxster]

Originally Posted by blue2000s

That's totally incorrect. It's always a restriction and there will always be some pressure drop, no matter how much or little the engine is pulling in as long as some air is moving. A flow bench would show a pressure drop as soon as any air started flowing through the snorkel.

Hi,

Of course you are correct. I just meant to express that I just think this differential in pressure has little to no effect on overall Volumetric Efficiency which of course is a major determinant in how much power the engine can produce.

I'm not convinced that the Snorkel makes a significant difference, but that aside, I don't think the lister has proven otherwise.

Mrs. MNBoxster is away doing the Accenture Match Play Tourney in Tucson, and I'm having some guys over tonight for a little Boozer. But, I have a neat little engine where I can model AVF, TAF rates and VE, for given engine volumes and parameters. I'll plug in the Boxster data to see what we're looking at. With that, and some measurements of the Snorkel (which I have on a shelf in my garage), we should be able to have something more concrete. But, It will be a day or two.

I'll come back to this in a separate thread. Hope to have your input there...

Happy Motoring!... Jim'99

[wanna986]

Jim, while we're on the topic of factoring in variables, do remember to take into account the "self-levelling annoyance" caused by the vodka you mentioned in a previous thread.

[Bisimoto]

Wow..this is so sad...so much happened on the board while I spent more time beating my poor S on the dyno today. I have repeated the results on 17...yes 17 passes with and without the "snork". The data remains the same. For what it is worth, this mod produces 4.6~5.5whp at high rpms. Whew!

[MNBoxster]

Originally Posted by wanna986

Jim, while we're on the topic of factoring in variables, do remember to take into account the "self-levelling annoyance" caused by the vodka you mentioned in a previous thread.

Hi,

What's that all about? You're just being NASTY! No call for that - shame, shame... That's very Clintonesque - attack the detractors - congratulations! Anyway you cut it, thats a cheap shot - Thanks for your valuable contribution to this thread. Feel Good now?...

[MNBoxster]

Originally Posted by Bisimoto

Wow..this is so sad...so much happened on the board while I spent more time beating my poor S on the dyno today. I have repeated the results on 17...yes 17 passes with and without the "snork". The data remains the same. For what it is worth, this mod produces 4.6~5.5whp at high rpms. Whew!

Hi,

Well you're certainly getting consistent results. I may be starting to come around.

This is for the 3.2L, I doubt the 2.5L w/o egas, Motronic ME 7.2 and variable intake will achieve anywhere near the same result.

I called a friend who owns a shop w/ 2 inertial dynos, and just for ********************s and giggles, I'm gonna run over there this spring and see what it tells me, even with the tire dynamisicm, I should also get consistent positive results based on your findings. A good engineer is also intuitive and still I have this nagging sense that something's amiss.

But, at least for now - You Da Man! Congrats!

Happy Motoring!... Jim'99

[Bavarian Motorist]

Originally Posted by MNBoxster

Hi,

What's that all about? You're just being NASTY! No call for that - shame, shame... That's very Clintonesque - attack the detractors - congratulations! Anyway you cut it, thats a cheap shot - Thanks for your valuable contribution to this thread. Feel Good now?...

Jim,


I may be wrong, but judging by the "tone" and context of his post, I am sure he was only joking.

[wanna986]

Originally Posted by Bavarian Motorist

Jim,


I may be wrong, but judging by the "tone" and context of his post, I am sure he was only joking.

Self-levelling annoyance

I think Jim knows I'm joking

[Bavarian Motorist]

Originally Posted by wanna986

Self-levelling annoyance

I think Jim knows I'm joking

Could've fooled me But maybe that was the point

[koya1893]

good reading on this post. The "snorkle" is from what I can feel and hear on my 2000 S is definitely a mod one needs to do for what ever reason. Now some data on added hp. There seem to be the question on how to do this. well here's the link.
http://www.ppbb.com/boards/ppbbphp/showthreaded.php?Cat=&Board=ARCHIVES&Number=820409&page=&view=&sb=&o=

One might have a calibrated body to feel the gain but you sure can hear the change from doing the mod.

Ben

[Boxtaboy]

Is there really that much of a difference in sound? I've driven a few of my friends' Boxsters with the snork removed, and didn't really notice much difference from mine, hence never removing my snork.

[Stefan (Boston)]

Thanks for the great info. For most of us, it's not worth the cost of the dyno run. But it's good to know.

Did you alternate snork, no snork, snork, no snork, etc.? The reason I ask is that the DME does some weird ignition advancement/retardation compensation when it senses a change in air flow. I know that if I unplug my MAF, I get a noticeable increase in power.

Would you be willing to try the same thing with the stock air filter versus K&N?

[Bavarian Motorist]

Originally Posted by Stefan (Boston)

Thanks for the great info. For most of us, it's not worth the cost of the dyno run. But it's good to know.

Did you alternate snork, no snork, snork, no snork, etc.? The reason I ask is that the DME does some weird ignition advancement/retardation compensation when it senses a change in air flow. I know that if I unplug my MAF, I get a noticeable increase in power.

Would you be willing to try the same thing with the stock air filter versus K&N?

Huh...


That's interesting. I was wondering about that.

Will remove mine tomorrow, btw

[Sboxin]

Thank you for posting your dyno info. I will look forward to your continued HARD work on your Boxster.

I have put up a suggestion that Deluboz send you a set of headers to dyno.
We all have been searching for reliable test data on ALL matter of engine modifications --- as you can see by the reponses to your post

You have sparked great interest with your Dyno results -- I will continue to watch for all your future hard work results and appreciate your efforts to document the work (especially the photos).

Take care,
Ed

[Stefan (Boston)]

When you unplug the MAF you will get a CEL. You can easily reset it by disconnecting the battery for a short time (first make sure you have your radio code if your car is pre-2003) or by using a OBD-II reader.

When you unplug the MAF the car freaks out briefly. Then it uses an approximation (based on throttle body temperature readings, I believe) to decide how much air is coming in. The car has a tendency to stall when warmed up and idling. But in my base 1999 Boxster, I could keep up with 2000-2002 BoxsterS cars in flat out acceleration up to very high speeds.

[Bisimoto]

Originally Posted by Stefan (Boston)

Would you be willing to try the same thing with the stock air filter versus K&N?

Yes. My race team is sponsored by K&N. In the next couple of weeks, I will order a K&N filter from the factory for the S and post results as well.

Ed, I am willing and able to test the exhaust systems. I have also ordered a Porsche System Tester 2 to assist with my diagnosis during testing. Thanks for the kind words, and I will keep all informed of my data aquisition.

[RandallNeighbour]

Originally Posted by Bisimoto

I have also ordered a Porsche System Tester 2 to assist with my diagnosis during testing.

Holy crap! You've got some deep pockets there, friend! Aren't those suckers something like $3-4k or more?

[Bisimoto]

Forgive me for not being clear: I ordered a PST from Durametric for $630. I wish I had DEEP pockets..lol.

[Tool Pants]

For what it is worth, here is info on the 987/Cayman.

http://www.pca.org/tech/tech_qa_question.asp?id={24041683-6376-4DD9-80EC-3A5F748391BF}

If the link does not work I think you have to copy and paste.

[Bavarian Motorist]

OK, now I am REALLY doing this today!


If my friend ever stops sleeping, damn it :\