View Full Version : MK1 on CIS, how little of the vacuum lines can be run?

2012.01.30, 21:21 PM
This one's for you Chris :p

Ok, as I see it, the bare minimum needed is:

Valve cover to intake mani

Valve cover, on-way valve, T with one side to dizzy and one side to booster.

Anything else? Emissions testing (evap) is not a concern.

Rabbit 16v
2012.01.30, 23:25 PM
I really need to see a pic of your engine bay. Also, what version of CIS? Gimme a pic and what version and I can certainly let you know. :beer:

FWIW, I have run a high comp 8v with two vaccum lines on a carbed setup and it was super clean through emissions. Just matters how you set it up and the tuning. ;)

2012.01.31, 00:32 AM
technical ;)

2012.01.31, 08:40 AM
Ok, I'll get a hi-res pic of the bay, it is missing many things right now though. And I don't have a clue what CIS it's supposed to be. It's in the 76.5 Super Scirocco, but I have a feeling it is not the original fuel dizzy.

2012.01.31, 13:24 PM
ok, here ya go (click for hi-hi-res)

http://gallery.twardnw.com/var/resizes/2012/January-2012/IMG_0338.JPG?m=1328045013 (http://gallery.twardnw.com/var/albums/2012/January-2012/IMG_0338.JPG?m=1328044900)

2012.01.31, 13:31 PM
Brake booster, PCV, Distributor

Rabbit 16v
2012.01.31, 14:29 PM
Vac advance for distributor, vac retard for distributor, brake booster. PCV vents to airbox. If you want it to have the high idle when cold, you will need to have the tube from the aux air regulator to intake boot and the other side of that connected.

Unrelated, but the intake tube is on backwards.

2012.01.31, 15:27 PM
Which side is which for dizzy advance/retard?

Rabbit 16v
2012.01.31, 16:04 PM
retard is the side toward the distributor and the advance is the one pointing away from the distributor

2012.01.31, 17:29 PM

2012.02.01, 10:31 AM
Ok, now where to source a 1/2" check valve. My brake booster is weird, it has a nipple on it instead of a spot to shove the check valve into it.

Rabbit 16v
2012.02.01, 10:37 AM
you can use one from a MKII or MKIII. Just carefully cut the plastic tubing from it and use the regular rubber tubing.

2012.02.01, 11:27 AM
ok, ports on throttle body... I have one on the front, one on the back. Do they tap different sides of the butterflies? can I use those for advance/retard?

2012.02.01, 11:36 AM
Eureka! I saved the check-valve from the 80 :)

2012.02.01, 12:58 PM
I think I have it routed correctly now.

Off the back side of the TB goes to dizzy advance, off intake mani goes to dizzy retard, yes?

Rabbit 16v
2012.02.06, 17:37 PM
Damn. sorry to leave you hanging man, I totally missed this thread. retard should be intake manifold vacuum, and the advance should be on the backside of the throttle body towards the firewall. Dont hook it to the one on the other side of the TB as that one gets vacuum when the secondary throttle plate is open (iirc).