Dokta

I have a 1990 convertible that I have installed an S5 J-spec TII engine into. I'm using the wiring harness from my N/A engine. I am nearly complete, but I do have a few questions. Hopefully some of you out there will be able to help me out. If anyone sees anything wrong with what I did, or something that I could have done better, just speak up with your opinion.

There is this nipple that looks like it needs a vacuum hose on it sticking out between the upper an lower intake manifolds, on the firewall side. I was unable to find it on the vacuum line diagram in the FSM.



I think that I need to route these two hoses to each other. The one on the left comes from the brake booster, and is looking for a vacuum source. The other one comes from the intake manifold, but I couldn't find the routing for the brake booster anywhere in the FSM. Just want some confirmation from someone who knows for sure.



I think that this vacuum line is supposed to go to the pressure sensor from what I can see in the FSM. The problem is this line has a T in it, and doesnt seem to want to reach. I can run a longer hose if i need to, but again, I would like confirmation.




Not quite sure what this plug is for. There are two male spade connectors oriented perpendicular to each other on the same plug. You can clearly see it comes off of the emissions harness at the same point where the TPS connector comes off.



This is where I spliced in the plugs for the Duty Solenoid Valve, and the Knock Sensor. The knock sensor only had one wire, so I wired it up to the power side of the plug that used to go to the VDI since they both use pin 2M on the ECU harness. The ground wire I just left dangling. I splice the plug from the Duty Solenoid Valve onto the wiring harness where the 6 port was since they both use pin 3R on the ECU.



Again, not quite sure what this plug is for. This one has two female spade connectors oriented perpendicular to each other on the same plug. I thought maybe it went to the other plug with the male spades, but why would I have to connect two plugs on the same harness?



Not quite sure what this sensor is. I think might be in a coolant channel becuase that hose right under it goes to (from?) the heater core. I'm assuming the other plug I marked connects to it, but I'm not sure what it is. The yellow plug on the block would not come out with moderate force. I tried pulling on the plug, then tried pulling the metal part in the middle with needlenose pliers, but it still wouldn't come out. I decided to ask before I ended up breaking it.



Thanks for checking out my swap. Again any opinions are welcome. I've learned a lot about the 2nd gen RX-7 since I started this swap. Once I get this thing running I think I will draft a detailed write up on the swap with all your help of course. Thanks again.

~Manny

monkhommey

sweet i have a 91 vert that im planning to do the same to.. so when your done i will gladly take your write-up. sorry im not any help to ya..

88rx7gxl

The vacuum line that you think goes to the pressure sensor.... On mine, it T's and one goes to the boost sensor, and the other goes to the blowoff valve.

RotaryResurrection

iTrader: (8)

1) is the splitter for the 4 OMP injectors. IT needs to go to the fattest nipple on the back of the upper intake manifold, right beside the throttlebody.

2) The hoses do hook together, use a long enough hose that won't kink and deprive the booster of vacuum. You're supposed to run a checkvalve to prevent the booster from seeing boost from the manifold, but I've never had to brake while under boost conditions so I wouldnt worry too much about it.

3) you can run both the BOV and the boost sensor off the same line with the tee, or you can run them off different lines. Either way works. There's a spare nipple on the UIM right where it mates to the LIM, and you can use that if necessary. It doesnt matter, either way will work.

4) the white and black 2 wire plugs shaped like T's both go to the ACV.

5) kinda hard to tell about that, but it sounds okay based on your description.

6) IF you're reusing the NA harness, that wire should go to the AWS valve, which the jspec motor doesnt have. IF it were a US spec turbo motor it would be on the passenger side top of the UIM. Just leave it unhooked.

7) coolant temp probe for the dash temp gauge. Remove the broken clip from the sensor, and reinstall the new wire/clip onto it.

Dokta

1) I found the hose, it had gotten stuck under the UIM. I simply fished it out, and plugged it in.

2) I will plumb these together. There already is a check valve in the hose that comes off the brake booster.

3) I found it easier to tee them off the same line.

4) I can only find one plug coming off the ACV. The black T shaped plug fits into it. Maybe the J-spec cars only had one plug? I would still like confirmation on this.

5) Trying to get the broken plug off without breaking the sensor. I'll get to it this afternoon.

Thank you very much for your help. Its like having a pro over my shoulder. I still can only find one plug coming off the ACV. I looked all over it, but that area is a bit cluttered. If anyone can tell me for sure that the J-spec S5 has 2 plugs, that would be great.

Thanks again.
~Manny

RotaryResurrection

iTrader: (8)

Dude, I've worked on hundreds of FCs and engines, I think I know.

classicauto

iTrader: (3)

ever so modest....

hondahater

iTrader: (2)

just being truthfull. I would tend to trust kevin in what he says. he's got alot more experiance than about 90% of the people on this board.

classicauto

iTrader: (3)

Yes, I realize that....it was half a joke

The oher half stems from the fact that the smartest people are the ones who know they know nothing at all....

RotaryResurrection

iTrader: (8)

Dont get me wrong, I dont think I know everything, and I've gotten surprised a time or 2 through the years. On the other hand, being realistic, if a man knew just the stuff I've forgotten, he'd be pretty smart.

classicauto

iTrader: (3)

true true

Dokta

A wise man once told me, "Arrogance is more dangerous than ignorance."

But back to the technical topic at hand...

I'm glad to have someone with such far reaching 2nd gen RX-7 experience and knowledge at my disposal. Because I really need it. My dumb *** can not find the other plug on the ACV. I'v removed the pipe between the turbo discharge and the intercooler, but all I see is one plug coming out.

I checked the ACV from my N/A motor, and there are clearly 2 plugs on it. One on the upper forward portion, and one coming right out the side. On the turbo engine the ACV has that one on the upper forward portion, but where the other one comes out there is just a blank spot of aluminum.

If you could post a picture or diagram showing where that second wire comes out, that would be greatly appreciated.

RotaryResurrection

iTrader: (8)

Unfortunately I dont have any documents or pictures pertaining to jspec parts, only US stuff. Most of the time what happens is that the wires break off from the threaded part of the sensor, leaving just a nub. Or, someone removed the sensor altogether. Every acv I've seen, including jspecs, had 2 sets of wires, but I've dealt with more s4 jspecs than s5, so perhaps it is a change they made between series.

Really, this doesnt matter. I can assume you're running an open exhaust with the swap, which negates the need for the acv anyway. Just leave it there, or spend 30 bucks on a blockoff plate that will clean that side of the engine up a lot.

Dokta

Well I have to get my car through emissions before I start ripping stuff out of it. I will be happy as long as this does not prevent the car from starting and running normally.

RotaryResurrection

iTrader: (8)

The car will run the same with or without the acv plugged in, and with or without it installed. It just directs the airpump's generated air into 1) the cat to keep it cool and help it work, 2) the exhaust ports to combat afterburn due to excess fuel vapor in the exhaust (backfiring) or 3) the silencer muffler in the front of the engine bay for leftover airpump air to escape.

Jesus Eunos Vega

I know this is a old thread but, do you still have the pictures of the wires you spliced? Thats all i need on my swap lol.

JerryLH3

iTrader: (11)

Clicking on his name and "Find more posts" shows that he hasn't posted in over five years, so you may be waiting a long time if you wait for him to respond. Hopefully someone else can chime in for you.

clokker

iTrader: (2)

Allowances must be made due to the fact that the OP is an Ent.

Jesus Eunos Vega

Yea.. I knownhe hasnt posted i a while. I was hoping fornsome one to chime in