PhantomX
New Member
So I'm always one to tinker and squeeze everything I can out of a car, sometimes even the little things will surprise you. As with most of my cars the first thing I tinker with is the airbox, while most are adequate they are usually feeding a big engine thru the small hole possible. The SHO is no different. That measly little hole under the lip of the hood is a joke. So I removed the snorkel and pulled it off and I have to say it absolutely made a difference.
It's a bit of a pain and requires a little modification but it comes out and the opening in the front of the airbox after the snorkel removal is about 60% larger then the opening at the end of the snorkel where its supposed to suck in cool air.
I did some before and after runs using my iPhone and the dynolicious app. Say what you will but that app is damn accurate. I've used in many cars and it' very very close to the ET's at the track, I will say the 60' is off just a tad but the final numbers are usually almost dead on.
Either way for the purpose of testing regardless of the number if it consistently changes in one direction or the other you at least have a guage to go by.
So before my best 0-60 times before snorkal removal were a consistent 5.7 seconds and 1/4 mile was a best 14.0-14.1 at 100mph. With this hot, nasty humid 85+ degree weather in FL that's about right. Now, sans snorkel, consistent 5.4 0-60's and 13.80's @ 105mph in the same crappy weather. You can actually feel the difference, especially after a few days for the PCM to acclimate. I plan on adding a drop in K&N filter to see if that further helps the improvement.
That piece is a bit of a pain to remove.
1. There are 2 screws that bolt it to the frame, remove those
2. Unclip the top of the airbox
3. remove the bottom of the airbox and the snorkel as 1 piece.
4. remove the screw holding the snorkel to the airbox
5. Take a file (I used a dremel) and file down one of the tabs holding the snorkel to the airbox. This isn't a big deal and since the unit does bolt to the airbox it's easy to put back on and will stay in place even missing the little tab. Personally it's a bit over engineered, most cars use a rubber style connecter you can easily squeeze and remove, but oh well.
6. replace the airbox and clip the top back on, all done. Enjoy a better breathing TT SHO for free :woo-hoo:
To put it back on for some of the warranty worry warts is about a 5 min job, not that I think any service departmen would really care but ya never know.
It would be cool if we could get Rick at Livernois on a slow day to test this little mod on the dyno, snorkel on, run, snorkel off, run. I would venture a guess that you would see a modest gain under the curve, power adder cars like to breath, this one is no different. Efficient air in/out = more HP...
It's a bit of a pain and requires a little modification but it comes out and the opening in the front of the airbox after the snorkel removal is about 60% larger then the opening at the end of the snorkel where its supposed to suck in cool air.
I did some before and after runs using my iPhone and the dynolicious app. Say what you will but that app is damn accurate. I've used in many cars and it' very very close to the ET's at the track, I will say the 60' is off just a tad but the final numbers are usually almost dead on.
Either way for the purpose of testing regardless of the number if it consistently changes in one direction or the other you at least have a guage to go by.
So before my best 0-60 times before snorkal removal were a consistent 5.7 seconds and 1/4 mile was a best 14.0-14.1 at 100mph. With this hot, nasty humid 85+ degree weather in FL that's about right. Now, sans snorkel, consistent 5.4 0-60's and 13.80's @ 105mph in the same crappy weather. You can actually feel the difference, especially after a few days for the PCM to acclimate. I plan on adding a drop in K&N filter to see if that further helps the improvement.
That piece is a bit of a pain to remove.
1. There are 2 screws that bolt it to the frame, remove those
2. Unclip the top of the airbox
3. remove the bottom of the airbox and the snorkel as 1 piece.
4. remove the screw holding the snorkel to the airbox
5. Take a file (I used a dremel) and file down one of the tabs holding the snorkel to the airbox. This isn't a big deal and since the unit does bolt to the airbox it's easy to put back on and will stay in place even missing the little tab. Personally it's a bit over engineered, most cars use a rubber style connecter you can easily squeeze and remove, but oh well.
6. replace the airbox and clip the top back on, all done. Enjoy a better breathing TT SHO for free :woo-hoo:
To put it back on for some of the warranty worry warts is about a 5 min job, not that I think any service departmen would really care but ya never know.
It would be cool if we could get Rick at Livernois on a slow day to test this little mod on the dyno, snorkel on, run, snorkel off, run. I would venture a guess that you would see a modest gain under the curve, power adder cars like to breath, this one is no different. Efficient air in/out = more HP...
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