02-23-2007, 04:44 PM
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#1
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Registered User
Join Date: Sep 2005
Location: Minneapolis/St. Paul, Minnesota, USA
Posts: 3,308
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Quote:
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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.
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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
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02-23-2007, 05:10 PM
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#2
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Registered User
Join Date: May 2006
Location: Toronto
Posts: 277
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self-levelling annoyance
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. 
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02-23-2007, 08:08 PM
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#3
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Registered User
Join Date: Jan 2007
Location: Hacienda Heights, Ca
Posts: 75
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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!
__________________
Bisimoto Engineering
2001 modified Boxster S, slate grey, red interior
Last edited by Bisimoto; 02-23-2007 at 08:09 PM.
Reason: more info
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02-23-2007, 10:10 PM
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#4
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Registered User
Join Date: Sep 2005
Location: Minneapolis/St. Paul, Minnesota, USA
Posts: 3,308
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Quote:
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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!
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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
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02-23-2007, 09:52 PM
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#5
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Registered User
Join Date: Sep 2005
Location: Minneapolis/St. Paul, Minnesota, USA
Posts: 3,308
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Quote:
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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?...
Last edited by MNBoxster; 02-23-2007 at 10:36 PM.
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02-24-2007, 06:33 AM
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#6
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Registered User
Join Date: Nov 2006
Location: NYC area
Posts: 681
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Quote:
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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?...
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Jim,
I may be wrong, but judging by the "tone" and context of his post, I am sure he was only joking.
__________________
Miss my Boxster
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02-24-2007, 07:56 PM
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#7
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Registered User
Join Date: May 2006
Location: Toronto
Posts: 277
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Quote:
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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.
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http://986forum.com/forums/showthread.php?t=9685
I think Jim knows I'm joking 
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02-24-2007, 08:01 PM
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#8
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Registered User
Join Date: Nov 2006
Location: NYC area
Posts: 681
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Quote:
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Originally Posted by wanna986
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Could've fooled me  But maybe that was the point 
__________________
Miss my Boxster
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02-25-2007, 08:57 AM
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#9
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Registered User
Join Date: Jan 2007
Location: lexington park maryland
Posts: 15
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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
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