garretson/andial intercooler install

philip j · 03-06-2011, 01:58 PM

In the process of installing a longneck i/c. Please help identify these vacuum operated controls, (pics 2 & 3) and where to now locate them as the stock mounting location was on the recirc. body. If I were to use longer vacuum lines they would mount at the bolt hole location where the recirc valve attached to the intake manifold. What have others done? Pics would be appreciated. thanks Philip

xbmwguy · xbmwguy's Garage

iirc one goes to cold start warm up to give more advance when cold. mine has been off for a long time

TurboKraft · 03-06-2011, 02:27 PM

Hi Philip,
I posted an installation diagram here:
http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/592891-intercooler-install.html
Regards,

philip j · 03-06-2011, 03:04 PM

Hey Chris, your diagram is of great help, obviously from the the other posts, too more people than myself. This is a great forum! You could probably direct some info on what to do with these (pics 2 & 3) vacuum operated controls. Also I have attached a pic of a diffferent variation of a Andial intercooler piping configuration. Philip

oilonly · 03-06-2011, 03:52 PM

Hey philip I'm installing a long neck intercooler at the present time also. What I did was fasten the switch with the blue hoses to the intercooler piping that goes back to the turbo with some extra hose clamps. Not the Boost up pipe. The switch with the tan hoses I removed along with other smog related equipment. I notice in your picture you still have the 2 intake manifold pipes still open. Are you going to plug one and vent the decel valve to the other? That is what I am doing. Or I just might plug both and vent my decel valve to the atmosphere. Still thinking and reading posts on it.

philip j · 03-06-2011, 05:02 PM

I wanted to know what these switches did before I disconnected or mounted. My car works so good, I don't want to disconnect alot of controls. As far as the decel valve, I thought the air flow went from the intake, through the decel valve, and into the intercooler. Maybe someone will chime in and confirm the flow path! Any way I was going to plug the two ports at the intake for now, and see how it works. I get lots of crackling with my B&B muffler as it is. If its to noisy, I was thinking about reinstalling it, and teeing back into a pipe which goes to the intercooler. Its great to get this feedback. Cheers Philip

oilonly · 05:46 PM

The switch with the blue hoses connected is for adjusting distributer advance/retard on warm up. The switch with the tan hose is for the smog pump system. You connect the larger off center port on the decel valve to the intercooler and the smaller center port back to the intake manifold or some here let it breathe out to atmosphere with just a small hose connected.

Like this.

http://forums.pelicanparts.com/5098721-post11.html

TurboKraft · 03-06-2011, 07:56 PM

Quote:

Originally Posted by philip j

Hey Chris, your diagram is of great help, obviously from the the other posts, too more people than myself. This is a great forum! You could probably direct some info on what to do with these (pics 2 & 3) vacuum operated controls. Also I have attached a pic of a diffferent variation of a Andial intercooler piping configuration. Philip

Except for the 25mm 965/993 diverter valve port we always specified in the throttle body pipe, those two intercoolers are the same.

Vacuum solenoids:
If you're ditching the air injection, you can remove one of them (blah blah rules about smog blah blah blah...)
If you still have all the other K-Jetronic stuff in place and working, I'd leave the other valves in place. As overly complicated as it all is, it works.
If some of your K-Jet is already missing, or has been rebuilt or modified, it may be a crap shoot.

A recent USA-spec CIS 1989 930 we tuned had half of the K-Jet stuff removed, other pieces recently "rebuilt", some of the valves bypassed, some unplugged.... It had been through several hands and ran poorly. A slow car.
We spent about an hour on the dyno fiddling with these in a series of tests, connecting some and bypassing others, seeing if connecting both vacuum pots of the distributor helped or was worse... When we finally got the best configuration, the car was measurably quicker with a much stronger torque curve and no detonation. Great!
We used the same configuration on another 1986-89 930 and didn't get the same results.