[SD987]

MN,

You may be right in your dismissal of reports on the negative impacts of desnorkeling as urban myth and anecdotal, but generally speaking I'd value the input of someone who actually has a 987 and desnorkeled versus the theorizing of a 986 owner.

The owner I'm referencing is from PPBB. His comments are below and the whole thread can be found by searching their archives with "987" and "snorkel" using the "AND" search-qualifier.

Yup, I Re-Snorked my 987 S... Here's the tale,

Last night after I left work, I drove to Greenwich CT. to play Power Ball. With the jackpot at 340 million, I figured it could be worth the drive of 40-50 minutes.

At 9:30pm, I hit the Sport button, set PASM to "Normal," turned on the V-1 and away I went. With no traffic to speak of, a "brisk" drive and a short time later, I'm on Arch Street and the Lottery store I go to has run out of tickets.

Bummed but Determined, I locate another place a few blocks away and they have a line of over 75 people @ 10:30pm and the last ticket they can sell is at 11:00pm...and I'm going to buy several hundred dollars worth of tickets, so I'll never get served in time. They tell me they can start selling tickets at 4:30am, so I tell them I'll be back and they insure me they have enough tickets on hand to take care of me in the morning.

When I get back in the car, the low-fuel warning comes on. I cycle through the OBC and it shows that for this trip, all highway except for 3-4 blocks, my average MPG was 10.6!

10.6, that's way less than the Pepper loaner I drove last week. I guess I hadn't ever really paid attention to my MPG before, just my MPH

Anyway, I fill the tank and reset the OBC for the trip home...MPG is even less on the return trip, 10.3 MPG!

So, I decide this is the perfect time for an experiment.

I took a nap, awoke at 3:30am and Re-Snorked. I then reset the OBC and drove back to CT. over the exact same route in the Sport Mode w/ PASM on "Normal." My OBC reading... 20.8 MPG!

This has got to be a mistake! I get my Lottery tickets, reset the OBC and drive the exact same route back home...20.9 MPG!

I admit it, De-Snorking the 987 S had a negative result. Although the sound was incredible, to cut my gas mileage in half is not worth the audible pleasure I derived from being Snorkless.

The sound of the Re-Snorked Boxster is definately different, although I'm still running without the intake restrictor plate I'm not sure if this makes much of a difference in the sound.

I didn't have OBC on my 986, so I never measured the MPG on her after I De-Snorked and K&N'd. I did compare my gas consumption to that of other Boxsters when we were on drives, but I was always in the same range of mileage as other, Snorked Boxsters. Would someone with a De-Snorked 986 w/ OBC share their mileage results?

Subsequent post:[/

The intake of the 987 is like the one on the 986 SE, very closed and shaped. I think that I was actually allowing less air to get into the engine based on the recessed position of the air box opening where the Snorkel tube attached.

If the engine was getting that much less air, it would use more fuel to get the job done (I have no engineering degree and I'm a lawyer so take it easy on my scientific analysis )

Anyway, the instantaneous increase in the MPG is staggering to me. Although the test conditions were not perfect, I did keep many things the same;

The outside temps on both the De-Snorked and Re-Snorked run were within approximately 10 degrees of each other, cooler on the Re-Snorked run,

The trip took about the same amount of time, my top speed on both trips was about the same and I did not, knowingly, change my driving habits for the experimental run,

I listened to Heather Headly on both trips, I love her music and just and just got the CD,

I did not eat or drink between the runs,

I had no passenger on either trip,

I the De-Snorked trip up was taken with less than 1/2 tank of gas, while
the De-Snorked trip home was with a full tank, which might explain the slight
variation in the MPG, 10.6 - 10.3, on the De-Snorked runs,

I also add that the Re-Snorked trip up started with the needle just under
the "F" and upon arriving home, I still had more than 3/4 of a tank,

Top-up on both trips, no ac, no fog lights, and seat heaters used at any point.

It seems too dramatic to just be coincidence to me.