Hey guys. I am near the end of a TPI swap into my 350 powered 88 mazda Rx7. I am to the point of hooking up my vaccum lines, and i need to know which ports to plug up. Here is what i have deduced so far.

1) Run a line from one of the small ports at the rear of the plenum to the fuel pressure regulator. Which of the two small ports do i use?

2) Run a small line to the MAP sensor (relocated inside the car using the painless herness). Again, which port do i use?

3)PCV comes off of the manafold.

4)Large port on back of plenum to brake booster.

5) i am left with 2 unused ports on the throttle body. What do i do with these.

EGR is non existant on this car, and it is not intended to be emissions legal.

Thanks Guys.

 

i don't know but that is so cool.

 

1 & 2 pick whichever one you want. They're both the same.

3 & 4 are right.

5. the large port on the pass side of the tb goes to the breather in the valve cover. There should be a small vacuum port underneath the tb on the driver's side that gets hooked into the EGR system. There's also another large port on the pass side tb. I'm not sure if it matters which one you cap but I capped off the lower one.

I'm also helping a friend drop a 383 into an 86 RX-7. It's kind of surprising how it actually looks like it belongs there. We're putting on a carb though.

 

Vacuum ports on tpi cars are as follows:

(2) One big line to each valve cover (one being the PCV)
(1) HVAC controls
(1) Fuel Pressure Regulator
(1) Charcoal Canister/Cruise Control
(1) Power Brake Booster
(1) EGR system

I think thats all of them(?). All of these obviously come off the intake manifold at one point or another. If you aren't going to utilize one or more of these systems, ie. EGR, you will have extra vacuum ports left over and they can just be capped. Make sure you do a good job of capping them, rubber or something else that will seal good, because tpi engines are little b!tches when it comes to vacuum leaks. As far as which port to use it really doesn't matter, you just want the same size groumet at each end and hose routing that isn't gaudy. Stock, the PCV line comes off the lower manifold on the driver side, the other large valve cover lead comes off the passenger side of the throttle body, the hvac controls lead is the second biggest one at the rear of the plenum, the FPR lead is one of the small ones at the rear passenger side of the plenum, the egr system is the other small one back there, the charcoal cansiter/cruise port is a small port on the bottom of the throttle body, and the power brake booster is the big one at the rear of the plenum.

Judging by the size of this post, work must be boering the crap out of me today!

Good Luck with the swap, let us know how it works out.

 

may the rotary gods have mercy on your soul

 

Save your rotarted arguments for the Rx7Club.

Anyone that is interested in Rx7 v8 swaps, check out www.v8rx7.com check out the forum & www.thewrongmotor.com

Anywho. Thanks for the help guys.

Why do two lines come off of the valve covers when only one is a PCV? Do i need to route another to a breather or something to provide more crankcase ventelation? I will try to get this beast running this weekend maybe. I havent had much time to work on her lately.

 

The other goes to a breather.

 

The upper port on the throttle body supplies filtered engine ventilation air to the passenger side valve cover (normally a straight through fitting). The PCV valve controls the amount of air flow through the engine back to the intake for burnoff.