After a year or so I'm finally wrapping up the 7 but need some suggestions for vac line routing. This car has TB mod, premix and every thing that's not required for max simplicity or power removed.

I've got:
Aeromotive FPR on the wire wall by the TB
injector air bleeds on the secondaries
BOV on drivers side of engine bay on greedy pipes
Pressure sensor still on pass tower
boost gauge to cockpit.


I think the air bleeds go to the top on the firewall side. The big one on the fire wall side is capped (premix). The pressure sensor uses the nipple on the pass LIM.

I want to use as many of the opening on the TB as I can so I don't have to use Tees. So I need to know which ones provide full pressure/vac, air only...etc.

 

of course I've got a wastegate and the PCV system is looped into the jaz catch can.

 

Front of UIM:

Top: vac only
Middle: vac only
If you are not gonna run your PCV system, then you can cap these off.

Lower: vac and boost. Best nipple for EMS MAP sensor. Recommended by Hitman. Basically, for anything that needs the best source of boost and vacuum.

Back of UIM:

Top: vac only. If you have 4 nipples, then cap the very top one.
Top: vac only. Primary Injector airbleed.
Middle (bigger): OMP. On my car this goes to external WG.
Bottom: This is another source of boost and vacuum. I run my boost gauge of this nipple. Could also run FPR etc.

LIM: There is a nipple there that faces the firewall. This is the stock FPR nipple. Use this for FPR or cap it off.
There is also a nipple that sits between the primary injectors. That is the injector airbleed.

 

This info is wrong.

Nipples fed from in front of the throttle will only see atmopheric pressure or boost. Nipples fed from behind the throttle will see vacuum or boost. There's nowhere you'll see "vac only".

On the front, only the bottom nipple sees vacuum, the others do not. On the rear, only the bottom nipple sees vacuum, the others do not.

 

okay so from what you said, I can use the bottom nipple on the front and back of the UIM for vac/boost readings. The rest of the nipples will see atm or positive pressure only?

 

Ahh ok. Thanks for correcting that.

 

I had the same problem you had with too many tees. On the back of the UIM all the nipples should already be occupied if you are retaining your injector air bleeds and still have the thermovalve on the TB for the double throttle system.

This is my setup.

The nipple on the side of the LIM (ps) has a hose coming out to a tee that goes to the stock pressure sensor and my EBC. My BOV has the vac line going to the top nipple on the front of the UIM. The bottom nipple on the front of the UIM is for my boost gauge.

 

Oops, correction: The top and bottom nipples see vacuum, the middle does not. Sorry about that.

Since any self-respecting RX-7 owner would not be romping on a cold engine, the double throttle system does not need to be kept operational. It's nipple on the rear of the UIM at the bottom would be a good spot for a boost gauge.

 

okay I think I got it and there's just enough And yeah, TB mod is done so no thermo wax.

Fire wall side of UIM:
Top: Injector air bleeds
Oil spider feed: Cap
Bottom nipple: FPR (it's right there)

Front of UIM:
Top: Boost gauge
Middle: Cap
Bottom: BOV

Side of UIM:
Nipple to Pressure sensor

Waste gate @ turbo

 

Taking a look at what I had, I think I must have hooked up the air bleeds wrong. The car had been sitting for soooo long before I finished the vac rack, so I wouldn't be surprised.

What I've got right now is a line coming from inbetween where the oil injectors used to be (by the secondaries) and it curls up and connects to a fitting near the base of the injectors (parallel to the ground). I'm thinking that's wrong and the injectors were getting vacuum. Looking at a blow up of the vac diagram, it's hard to see, but I think that was suppose to go to the pulsation damper.

Also, that outlet by oil injectors seems to go to one of the nipples on the firewall side of the UIM.

 

So is there an oil injector air bleed and a fuel injector air bleed?

 

Me too, but I'm not really sure where you're talking about. The oil injectors are not by the secondary ports; the two on the manifold feed into the primary ports. The air line that goes on the nipple between the oil injectors (and is for the primary fuel injectors) goes up to one of the nipples on the rear of the UIM.

The injectors get vacuum directly from the engine's chambers, and normally sucks air through the lines from a nipple fed from in front of the throttle. Connecting their air line to a nipple fed from the wrong side of the throttle would simply mean there'd be the same pressure/vacuum at both ends of the lines and hence no airflow.

Nope, that's the line from the manifold to the FPR solenoid, and it goes under PD in the schematic, not into it.

Yes. S4's only have primary injector air bleeds, S5's have primary and secondary.

 

whoops, I had my primaries and secondaries mixed up

There is a nipple between where the oil injectors used to be closest to the housings and it stuck straight up towards the hood. I connected that line to the line at the base of the primaries that points at about a 45* towards the drivers seat. So I'm thinking I looped the oil injector and fuel injector air bleeds to each other. So nothing was getting a vacuum and nothing was getting filtered/metered air supply.

I think I need to cap that line between the oil injector plugs and run the line that points towards the driver's seat to the top nipple on the UIM.

The car ran, but I had to keep my foot in it. Could either be my 2 year old gas that I'll be draining or since all the solinoids, BAC..etc were removed and cold start, I need to bump the throttle stop up so it wants to idle a little higher.