2nd gen Airpump and ACV removal (turbo II shown)
On a Quest for more space under the hood, and maybe even a tiny bit of HP. Our eyes stare right at the airpump and ACV. These combine together to lower our emissions, but with no cats, don't do a dam thing (except open the 6 ports on the 89-91 N/As...)
**Note removing these items would be illegal for a car driven on the street....
Removing the air pump is very easy, just a belt, a few bolts, and 2 hoses.
First step pull the hose off between the airbox and airpump (of course by now you probably don't have an airbox, so you should've had a small breather filter on the pump, remove that.) Remove the bolt where the arrow is, and loosen the one at the top of the airpump under the rad hose. Now the pump is loose and can move side to side. Push it towards the engine and now you can slide the belt off. Then you should be able to slip the belt over the fan (or cut it if you want...) Now remove that top bolt (pump will want to fall) and the other 3 that are circled for the air pump bracket.
It's a bit of a trick to get the pump out, it's pretty tight in there with the stock fan and rad hose in place. As you wiggle it around you need to get another hose off the back of it.
Air pump removed, look at all that space!
At this time it would be very wise to spend a few bucks and do this mod while you are in there.
Now with the Airpump gone, the Air Control Valve (ACV) is useless, as that is where the air went to from the airpump.
**Note, before you start you will need an ACV and spilt air pipe block off plate. I got mine from www.k2rd.com
First step I removed the Intercooler hose and BOV between the IC and turbo, and the hose to the BAC valve (that red one in pic above). Stuff a rag of something in the turbo to stop stuff from falling in.
Next remove the rubber line that went from the ACV to the airpump (in blue), it attachs to a metal part on the AVC, you can take the metal part off with 2 screws, and just leave the rubber pipe attached to the meta partl. (sorry best pic I had)
Next there is a rubber hose on the bottom of it. This goes to a muffler that is under the Pass side Headlight. (see bottom)
Now with those hoses gone you can start on the ACV. it's only 3 nuts, and 2 wire harness clips. but with ABS they are a bitch! With out it, it's way to easy...
Off it comes. I just barely managed to slip it out past the ABS. Removing the BAC first would have made it much easier.
Look more space!
The 3 vac lines that went to the ACV need to be blocked off.
If you look closely above, you can also make out my split air pipe block off. I simply put it between the engine and split air pipe. I left the pipe on because it's still connected to the cat (Yes I am running a cat with no ACV and air pump!). So this way I block both the engine and the cat with one thing. Less work = good :) Plus it hides it well incase somebody wants to look...
I got the K2RD plate because I liked that it came with new screws, It allows you to remove the huge studs as seen above. However there were pretty hard to get out. All those years of heat really stuck them in good. I finally had to borrow a good pair of vise grips from my neighbor as my old ones were just slipping. Aren't neighbors great! :)
Studs removed, surfaced cleaned, and gasket maker on surface. (Didn't have a real gasket for it)
Block off plate screwed on, you can just barely see it. You will also notice where the vac line goes now. It used to go to a plug on the ACV, but of course that is gone now. I found a capped off nipple right below the BAC valve, so now I use that.
As mentioned above, one of the hoses goes to a muffler under the pass headlight, well here it is. 2 nuts hold it on.
You can see the hose in blue, goes from the ACV to the front of the car.
and under the car to the muffler
The piping was hard to get out! I undid that side of the plastic underpanel, and took off the plastic part where the brake ducts are, and managed to fight it out after some struggling.
I was disappointed though it didn't weigh too much, I was hoping for some big savings :)
The air pump and ACV were about 15lbs.
Well that was a fun day of work.