chewy8000

I'm starting this thread since the other seemed to get a little lost. I recently installed a Euro S2 (84' LH-jet) throttlebody, plenum, and runners on my stock 81'. I had brackets made for the switches and everything works great just not really sure on the vacuum lines since the throttlebody only has two ports in the rear instead of 4 like the old L-jet version. I'm not sure which of the two is above or below the throttle plate and really don't want to tear it apart to find out. Has anyone done this converision before that could tell me where this mix matched stuff needs to go. Here is how it's hooked up now.

robot808

Tristan,
IIRC, the line from the TB to the dizzy goes to to the front/top of the dizzy. The bottom of the dizzy does not get a line, so you lose the retard and get a popping noise on quick decelerations. The other port on the back of the TB, on my L-Jet set up anyway, goes to the a 3 or 4 way vacuum "T" that leads to the FPR's.
I can try to take pix, but it wouldn't be until late tonight.

chewy8000

I don't have any vacuum lines besides the two dizzy lines. I have ditched ALL of them for AN fuel lines and an aftermarket FPR setup.

mark kibort

all the vacuum at idle lines (coming from ports in the TB that is on the intake side of the throttle body, not the AFM side) would go to fuel regulators, smog stuff, and anything that has a requirement to have vacuum at idle. the other port, which is on the AFM side of the throttle body (no vacuum at idle) goes to the vacuum advance on the distrib. you can have a retard at idle, if you use the vacuum lines to feed it, but its not required and we ditched all that stuff on scots 82 to euro conversion.

tricky_dickey

i need some fuel injectors for my Porsche 928 euro part # 928 606 199 00 at 16 OHMS impedance/

now here's what i figure if i can get everyone to re post once and then it will flood the internet and someone in Siberia will say hey i have a set of those old bugger in my shop that would help this Unlucky... Canauck
richmondauto@telus.net i am desperate

mark kibort

I have a few. probably about 6 injectors from my old euro conversion where I was using the Ljet US injectors and ECU stuff that was on the car.

danglerb

Wrong part number, the LH injector is 928 606 119 00, and google will show some sources.

Mentioning a dollar amount you are willing to pay sometimes opens the floodgates.

robot808

Tristan, assuming you have the right line from the TB to the dizzy advance, I think you can just pull and cap the line from the plenum and leave the retard uncapped. That is how I am set-up with no issues.

danglerb

Are you saying the FPR don't have a manifold vacuum connection?

chewy8000

I run one of these. No vacuum lines other than the dizzy.

http://www.magnafuel.com/products/ef.../MP-9940-B.htm

robot808

alright, I'm out in the garage, and I don't think I can get a good picture, but my vacuum line is coming from the passenger side (US) port of the TB and running to the dizzy advance, so coming from the other port than what your diagram shows.
the drivers side port runs to the lines for the FPRs which you explained you don't need. So I would cap that.
as far the retard on the dizzy, nada. Car sounds a little meaner that way.

danglerb

Fuel pressure regulator is supposed to keep the fuel pressure differential at the injector constant, which means its supposed to track manifold vacuum, otherwise the fuel delivery rate per unit of time the injector is open isn't constant. No connection and you are likely running very rich at idle, and/or very lean at WOT.

robot808

tristan, what's going on with your lines? I have been curious to know what you have found.

chewy8000

I ended up just running the one (upper) line on the TB to the advance on the distributor. The retard line I just left unplugged. Seems to start and run fine.

robot808

Glad to hear it!