Making The GMPP Intake Functional
 

For Part 1, see the following post:

Installing the GMPP Intake - Cobalt SS Network

The long-awaited sequel to “Installing the GMPP intake” can now be told! The following suppliers provided the items indicated:

Summit Racing
Summit Racing
Scoop P/N SUM-471104CF

Jazz It Up
12201 E. Arapahoe Rd
Englewood, CO 80112
Mark Kilmer
Applied all the graphics

Tools Needed:

3/8 drill
2 inch STEEL hole saw for drill
1/8 bit
Pop rivet gun
1/8 x ¼ aluminum pop rivets
Four-in-hand file for wood and plastic
Round bastard file
Touch-up paint

Let’s get started!

https://www.cobaltss.net/gallery/fil...penedscoop.JPG

This is the scoop I ordered from Summit. It is one of a mirror-image pair – you have to buy the pair. I picked this scoop because of the shape, and I wanted carbon fiber look. The scoop is non-functional when it comes. I used a dremmel tool with a cutting wheel to cut out the front of the scoop. Cut close, but not exact. Use a four-in-hand file and a round bastard file to carve down and finish off the hole.

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Next it’s time to drill the holes through the hood (can’t put this off any longer!). I placed the scoop on the top and positioned it, and did careful measuring both top and bottom to make sure the holes would be inside the air box and would be inboard enough for the scoop to cover them. After a lot of measuring and marking, I started the hole. Start both holes from the bottom. The hole cutter has a pilot drill bit. Once it goes through the hole cutter drops onto the metal to be cut.

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I moved to the top, using the pilot holes already drilled and finished the holes from the top.

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There will be some burring, and it tends to be on the bottom of the cut. Drilling from the top means the burrs will be on the underside of the hood. Once the holes are cut, test fit the scoop to see if they’re in the right place (although if they aren’t, it’s a bit late now!). Use your round bastard file to clean up the holes. I then used touch-up paint to paint the bare metal in the cut to prevent rusting.

Next the hood graphics must be applied before the scoop is installed. I drove to Jazz It Up, the local experts in window tinting and vinyl graphics where owner Mark Killmer took over to execute my design. We thoroughly discussed what I had in mind. Mark was careful to make sure he understood exactly what I wanted, and made suggestions for improvements/changes based on his years of experience in auto graphics.

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Mark measures everything 2 or 3 times. These measurement marks are used to place the guide tape.

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Mark uses painter’s tape and cheap side stripe tape to lay out the design on the hood. This allows the design to be finalized and visually straightened before the vinyl sheet is applied.

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The vinyl sheet is applied. First Mark and a helper peel the backing and spray the sticky sheet with application liquid. The hood is also sprayed. The sheet is laid in place, and can be moved around because the liquid keeps it from tacking. I picked pewter metallic. This proves to be a great choice, as the silver goes well with the blue, and it’s a bit darker than straight silver. Plus the metallic pattern is almost exactly the same as that in the Lazer Blue.

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The vinyl is moved into place and smoothed out. Note how you can see the ridge of the guide tape under the vinyl. This will be the guide Mark will use to trim the vinyl. T
he metalic in the vinyl comes out in this picture, too.

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All the liquid is squeegeed out, which bonds the vinyl to the hood.

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Mark then cuts the vinyl. This is where skill and artistry come in. Mark is as good as any pin-striper I’ve known, but with a knife instead of a brush.

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And here are the panels complete, ready for the pin stripe.

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Mark cut the vinyl into ¼ inch strips to make the pin stripe, and applies them by hand. Quiet! Master Artist at work!

https://www.cobaltss.net/gallery/fil...sidestripe.JPG

To match the hood stripe, we applied a pin stripe on the side. This stripe is a wide and a narrow stripe to keep with the panel and pinstripe theme on the hood. This stripe is off-the-shelf, but is a very close match in color.

https://www.cobaltss.net/gallery/fil...4scooptrim.JPG

To make the scoop blend into the hood and look a bit less “add-on” I wanted the flange around the bottom of the scoop covered in silver. Here Mark is doing this. To get the edges to roll under and tuck up nicely, they are heated quickly with a heat gun and smoothed over.

https://www.cobaltss.net/gallery/fil...stallscoop.JPG

This scoop uses 3m tape all the way around the flange. We used the tape, but the sides of the scoop had a bit more arch than the hood. To get the scoop to sit down on the hood, we were afraid the spring in the scoop would pull the vinyl off the hood if we just used the sticky tape. I decided to use 2 pop-rivets on each side (plus we did still use the tape). I measured and pre-drilled the scoop. We then positioned the scoop and marked the position on the hood with tape. Next, the 3M backing on the scoop was pulled, Using the guide tape, we positioned the scoop starting with the back, the lowered it forward onto the hood. Get this right – wherever it hits is where it will be! With my son-in-law pressing the scoop down onto the hood, I match drilled the hood and installed the pop-rivets. I had pre-checked their position to ensure I wasn’t getting into anything on the underside of the hood. Be careful at this point, and don’t let the drill drop free when the bit goes through or you’ll end up with holes in engine parts.

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This is the finished product! It came out pretty much like I imagined it when I designed this mod. The color is spectacular in the sun. It almost now looks like a silver car with candy blue over it – that’s how well the metallic in the vinyl matches the paint. Functionally, it moved almost all the noise out of the interior. When you open the right window, you can really hear the intake. With the windows closed, it’s much more subdued. This indicates it’s really drawing air from the scoop. For those of you more interested in noise in the interior than function, feel free to leave the gasketing off, don’t drill the hood and leave the scoop fake. That will give you maximum noise with minimum performance gain!

Next, I plan to cut a 1-piece gasket for the hood and replace the hood blanket with a new one cut a lot more professionally. I have more vinyl on order to do the trunk to match. We’re not sure yet about the roof. More to come!

Jay

Thats pretty cool. What are you going to do when it rains? I was always curious about that when it comes to scoops.

with a low scoop like that, believe it or not, the moving car is more than enough to keep the water out of it... any few drops that DO get in just drain out the airbox holes.

some people bend a sheet of aluminum as a cover for the top of the filter.

edit: that looks awesome.

Oh my lord I can't believe you did that....

You would have to submerge the hood in order to hydrolock the engine

BTW, you should have done more than two little holes, I would have cut out a gigantic square!

a lot of times, if you do that, you'll get wrinkling around the corners... round is better, and two or three circles will keep most of the hood in tact.

looks nice man looks pretty well done also

Looks Great MAN !!!!! :twothumbs

stripes are a little large... but still sweet non the less

thats awesome!

I fully agree. It rained pretty good while I was driving home Friday and didn't have any trouble. Nor have I with other similar installations.

My thoughts exactly. These holes are 6.28 square inches. A 3 inch tube is about 7. That should supply sufficient air (it's more than the bottom of the stock snorkel!).

I may well cut out between the holes to make an oval. But I'm concerned about strength of the hood panel. Modern cars are designed to have most of their strength through shape - remove some metal and it gets flimsy.

Sounds good. That's nice to hear! :twothumbs

It's quite easy, actually. Just drill some holes! Oh, you might want to do a little planning and a little measuring...

This took a lot of thought before I took the plunge. But it's MUCH cheaper than the carbon fiber hood.

I would actually bet that a Cold Air Intake filter would get more wet in an equivalent rain storm than a functional hood scoop filter

notice any performance inrease with the intake/stock hood to the intake/modified hood?

What about with snow? how are you going to keep all the snow out of there?

Super job! How would it look if you put the opposite scoop on the drivers side? Might be a bit too wide to look as good as a single scoop. Now if GM would only put their talent to work and come up with a stock hood set up similar to yours.....see if they'll hire you!

pretty cool idea man!

I think the vinyl is overkill though....

I would have painted the scoop body color... make it look as factory as possible... like one of the old SVO mustangs or some of those other 80's cars that had offset functional scoops.

The carbon fiber with all the vinyl looks a tad ricey...

hey
 

sorry i like it but 1 scoop looks wierd it looks like some mexi jacked 1 of ur scoops. i seriously think u should do another scoop for just the look level u kno

I cringed when I saw the guy cutting the vinyl on your hood, computer cut vinyl would of been much better. I hope he used a REALLY sharp blade and a very light touch, otherwise you're going to have that outline cut into your paint.

Other than that, not bad looking. Although I would of eith covered the scoop with the same vinyl (of course he wouldn't of been able to do that installing the vinyl wet), or painted it blue to match the rest of the car.

Well, I didn't do dyno runs or anything, but seat of the pants I believe it responds more freely. Might be worth a few HP, probably not in the 10 HP range though.

One approach I've considered is opening the hood and placing a plastic bag over the top of the air cleaner box. The air cleaner would then draw from the stock inlet, and would be sealed from the hood. As for the scoop filling up, so what as long as it doesn't get into the air box? :)

There are a couple of posts about adding a fake scoop. Please feel free to do whatever you think looks the best on your car. The point of customizing is to get what you, the owner wants. I don't have a problem with an offset scoop. I grew up around inline 6 cylinder dragsters that did this, plus the Porsche 944 S and 924 Turbo, Mustang SVO and many others. To me it looks right. I have a real problem with non-functional scoops, and wouldn't consider adding one just for looks.

Same with the comments on the stripes being too wide. Yes, I'd prefer them to be less so, but they had to be wide enough to pick up the scoop location. As for painting the scoop body color, I guess I wanted some flash :cool:

I think it looks better in person than the pics. It's mine, I tell you, mine! I got what I wanted! :cussing:

Sorry, must be late with my meds. Nurse! Nurse! Where's the med cart! :lol: