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

[porsche986spyder]

Originally Posted by Bavarian Motorist

I'm not sure if the thermometer analogy conceptually applies here.

I agree. I look at the dyno results. I think it speaks for itself. By the way the link the other guy posted by PCA says he thinks by doing this we are removing the cooler air from the outside!?! Makes no sence, all we are doing is removing something that is restricting the air flow, not REMOVING the air flow all together, nor are we re-directing it from some place else, like from the inside of the engine. It will still pull the air from the outside! Look how close the opening is to the vents.

[MNBoxster]

Originally Posted by porsche986spyder

I agree. I look at the dyno results. I think it speaks for itself. By the way the link the other guy posted by PCA says he thinks by doing this we are removing the cooler air from the outside!?! Makes no sence, all we are doing is removing something that is restricting the air flow, not REMOVING the air flow all together, nor are we re-directing it from some place else, like from the inside of the engine. It will still pull the air from the outside! Look how close the opening is the the vents.

Hi,

Dyno results can be funny and not always verifiable or repeatable. The Lister must admit this if he's the kind of engineer, he seems to be.

So many variables must be exactly the same on each run for any results to be meaningful, especially since you're claiming a very small % gain of overall power (1.9%). Some, but not all include: Ambient Temp, Barometric pressure, Fuel flow, Octane, Alternator Output, each line of code in the DME operating w/o fault on each run, Engine Temp, Tranny Temp, Bearing Temp, and on and on.

For example, an Alternator (whose power draw is variable and not constant) alone can draw as much as 4-30 crank HP because of the inefficiencies in a Belt & Pulley system, so if it was filling demand on the 1st run, but not the 2nd, this alone could account for the variance seen.

The best method is to do multiple runs exactly duplicating the conditions of all previous runs and then averaging the results. Then, you reverse it, put the snorkel back on and see if you consistently achieve the previous Baseline numbers over an average of multiple runs. If these results aren't duplicated to within a pretty narrow degree, there is some variable not being accounted for.

Just because you get a graph from a single run which supports your theory, isn't in, and of, itself proof of anything...

Happy Motoring!... Jim'99

[pecivil]

I must admit that I too did not really "buy" what it suggests on the thread from the PCA website. I had seen that before, and it does not make sense how the snorkle would actually cool air as it flows inward. Why would the restriction cool airflow?

[Bavarian Motorist]

I can't figure out how to remove the blinds w/out breaking it. I see it has little snaps.


I have no clue what to do. Neither of the guides really explain how to do it.

[jwilson95]

Probably a dumb question, but just want to confirm that you only need to de-snorkel on driver's side???

Thanks in advance,

Jeff

Originally Posted by jwilson95

Probably a dumb question, but just want to confirm that you only need to de-snorkel on driver's side???

Thanks in advance,

Jeff

Jeff, correct, the passanger side vents are for cooling.

[jwilson95]

I got to the "Pull out the tube" and mine just does not want to come out. I pulled and shaked that thing until I was afraid I was going to break something.

What gives?

2002 986S

Jeff

[alikhan78]

I had the same issue, I pulled and shook it and it just wouldn't budge. I was pulling pretty hard and I was afraid I was going to rip something out. After three trials I went on the net got some encouragement and once again went and pulled it as hard as I could, it finally came out after a while.

Originally Posted by jwilson95

I got to the "Pull out the tube" and mine just does not want to come out. I pulled and shaked that thing until I was afraid I was going to break something.

What gives?

2002 986S

Jeff

[Bavarian Motorist]

Anyone got an idea about how to remove the blinds?

[2000SoCalBoxsterS]

Originally Posted by porsche986spyder

I agree. I look at the dyno results. I think it speaks for itself. By the way the link the other guy posted by PCA says he thinks by doing this we are removing the cooler air from the outside!?! Makes no sence, all we are doing is removing something that is restricting the air flow, not REMOVING the air flow all together, nor are we re-directing it from some place else, like from the inside of the engine. It will still pull the air from the outside! Look how close the opening is to the vents.

I agree the air temp arguement doesn't really make sense. There is no heat source in that small vent cavity to warm up the air flowing in. How much difference could that snorkel tube really make in air temp? Besides, does the car not work perfectly fine in Florida or SoCal when the outside temps are very high, and in the Mid West and Northeast when the temps are very low? The enigine is computerized and designed to function and compensate at a wide temperature range.

I think that Snorkel has more to do with accelerating or focusing the air flow to the airbox. I'd like to know more about the aerodynamic design of that Snorkel.