kevboost7

Thanks man. Im in the garage now. Dear god, that last hose is so far back. I forgot how much of a pain in the ass it was to work under the plenum.

Can someone explain what the blue line is then? Green is waste gate. What is the blue? And why is the plenum "turbo pressure"?

@GTSBoy @joshuaho96 Thank you guys, and especially thank you josh for that diagram you made. It is clear for me now. Why does the 3 Port only come with 2 of the barb fittings? I will have to buy another barb fitting now. @r32-25t There are no professionals near me. I am learning, which is important to me and one of the reasons i got this car. And the one professional i took it too was my tuner, who told me to get rid of all the 30 year old hoses and just run new hoses from the wastegates. I felt like there was a better way to do it. Thats why im on here.

Okay thats what i thought you were trying to say. I will give that a shot tomorrow. It just did not seem right, because every diagram i see on the internet has 1 port on the 3MAC Valve with the cap that vents to atmosphere. I'm still confused, on this diagram below with the twins. I thought that the "turbo pressure" line was the blue line. In the RB26, where is the turbo pressure line?

thats literally what i did!

@joshuaho96 I'm sorry josh , i dont know if i'm dumb or missing something here, but your original diagram makes no sense with my configuration. I have internal waste gates. This is what you said: "Port 1 is the blue line. Port 2 is the green line. Port 3 is also the green line. The key point is that you will have to modify the vacuum line for port 3. Instead of tying port 2 and 3 together you cap the vacuum line on the combo coolant/vacuum pipe and the line on the plenum goes directly to the valve. Port 2 has unchanged routing." based on that description of what you said above^^ this is what the connections should look like below: is that what you are suggesting? Port 1 on the Mac valve (vent to atmosphere) should go back to the turbo pressure?

According to your explanation @joshuaho96 this is how it should be connected right? What i don't understand is that if i route all the lines like this... how is the plenum equal to the wastegate line? I thought port 2 on the MAC valve should be port the waste gate line? I really appreciate you guys helping me look at these diagrams.

Right now, this is how everything is connected in my car. According to the theory, everything should be working.. its just that other green line going to the plenum that is confusing me.

What happens if the factory solenoid is not activated and it is not tied to the plenum? Wont it just bleed the air back? And when you say blue line, isn't the blue line the turbo pressure?

What is confusing me is the green line going to the wastegates that is also connected to the plenum. Why can't i just replace the factory boost selonoid with a 3 port mac? Why do i have to cap off the factory dual vacuum/coolant pipe and use the line from the plenum?

are you in the states? i wish i could talk to you on the phone. Not sure if you're up for that. My number is 703-626-8787

Hey @joshuaho96 i got my car tuned last weekend, and we installed the 3 port mac. The tuner turned up the boost on the computer, but it wasn't actually boosting any higher... i'm re-reading your instructions and they are confusing. "Port 1 is the blue line. Port 2 is the green line. Port 3 is also the green line. The key point is that you will have to modify the vacuum line for port 3. Instead of tying port 2 and 3 together you cap the vacuum line on the combo coolant/vacuum pipe and the line on the plenum goes directly to the valve. Port 2 has unchanged routing." What you said in quotation above, does not align with the diagram with the twin turbos. According to the diagram, port 2 is the wastegate and would be the green line.

Yes, last year i had all the hoses replaced with new silicone ones. And i even replaced that silver hard vacuum/coolane pipe that all the hoses connect. That hard pipe was corroded. Everything under the plenum is 100% dry. This is a silly question, but the transmission dosent get any coolant does it?

i looked everywhere.. under the plenum is dry. Its only around the transmission area. I'm so puzzled. I tried to get a endoscope to look at it, but its too dark to tell. At this point, i don't think i can see where the leak is coming from unless i remove the engine.. is it possible to get to the back of the motor without removing it? I'm assuming its the half moon things, but i've never seen them with my own eyes.

I'm getting ready to rebuild my brake calipers.. how do i cap off my brake lines? Are they banjo bolts? If i have the calipers off for 1 day, how do i prevent the brake fluid from leaking everywhere?

Not sure if this is a dumb question, but I had the front of the car on jack stands and was checking the tie rods. I had my hands on the 3 and 9 o'clock position on the tire and wiggled left and right. There is no play on the tie rod, but i noticed there is some play in the steering rack itself. When i moved the tire left and right about a few cm, my dad said the steering wheel also moved with it. Not quite sure if i'm doing the test right or if its normal for the steering rack to have this play.

why do they measure it from the centre of the wheel? it seems inaccurate

345mm from the ground to the top of the fender?

Like the title says, how lowered is your car? And how does it handle on the street? Mine is really low (came like this from japan). I can barely fit a finger between the tire and the fender. It looks good, but is a pain in the ass to get a jack under the car and it does not ride good on the street.

Also, while i'm replacing the inner tie rod boot, anything else i should replace? the place i buy parts, charge shipping so i'm trying to bulk buy everything to avoid paying shipping twice lol

what would i be looking for? shiny new looking pistons? do pistons have markings on them to indicate a brand or something?

Duncan, thank you for this. The previous owner did say that he paid a shop to rebuild the engine with forged components. I have no way of verifying this, but I know that the shop wasn't detail oriented as there are mix n matched screws everywhere. And they did not replace the coolant water hoses or metal line under the plenum that was rusted. Last year, i replaced all the coolant hoses. As for the welch plugs. . in my drawing, is this where the transmission connects to it?

I dont even know where the welch plugs are at on the engine. What are they for? Does anyone have a diagram?

It can't be from the heater hoses. I checked and its clean.

Good points GTS. Is it possible to replace the welch plug on the back of the engine while it's in the car? So let me understand. In normal conditions, inside of the boot, the rod should be clean and have no grease or PS fluid on it?