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Discussion Starter · #1 ·
I went to drop some tools of for my friend yesterday for his motor rebuild, and what do I see lying on his basement floor... two Z6 manifolds! I asked him how much for one, and he said 10 bucks! I haven't got it yet, I just want to make sure it's going to fit without problems with my stock injectors and stuff. I remember reading or PMing with someone on the Resource a while back about using a Z6 or Y8 IM because it's less restrictive. Is there any gain to using it? Will I need any specific parts to make it work? Will it be slower without the PGM-FI lettering!?!
 

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Discussion Starter · #8 ·
Ok, he has the fuel rail and the TB for it, it's complete, pulled off his blown Z6 motor last year. Can you just put a h22 or b16 TB on there? I actually have a b18 TB someone gave me for free, will that do any good? Will this give a noticable gain, or is it just what all the cool kids are doing?
 

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Discussion Starter · #11 ·
I picked it up tonight and cleaned it out. I pulled the TB off to clean it and lube the spring, so I can't put it back on until I get a new gasket for that, and I'll probably get another intake manifold gasket. Everything is on it, and I got the fuel rail with the FPR. I'm going to get new vac lines tomorrow too, I had to break a few to get them off and it's probably better to just replace them all. Should I use the FPR from the A6 or the Z6, or will it make a difference? Also, what's the best way to clean out the inside of the mani? I put duct tape over the ends of the runners and filled it with parts cleaner and let it soak for about half an hour, then blew compressed air through it. It didn't seem to help too much.
 

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Discussion Starter · #14 ·
The one I have is from a B18A. I'll stick with the Z6 one now I think. I have a friend who does CAD work at an engine shop near here, he's going to take the mani in and sandblast it, and then clean the inside out. I can get a lot of stuff for free there, if I decide to use the other one I'm sure he could port match it for me.
 

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Discussion Starter · #15 ·
Just wondering, since I'm going to replace the manifold, what can I remove as far as emissions and stuff? I don't have emissions requirements for inspection at home so it's not an issue. I'd like to have fewer vacuum lines.
 

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Discussion Starter · #16 ·
Ok more questions. I'm comparing the z6 manifold to the pictures I have of mine here on my computer. First of all, it looks like the line for the brake booster and also the white plug on the side of the A6 manifold are in different places on the Z6 one. Will I need to extend anything to make it fit, or should there be enough room? Also, there's a canister thing on the back of the A6 mani, what is that?

 

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Discussion Starter · #19 ·
To get to the real point: I'm giving my friend the manifold tonight, he's going up tomorrow to clean it up. I was reading last night about polishing/not polishing the manifold. It seems that a lot of people say not to do it, but don't know why. Also it seems like a lot of engine builders do it. The naysayers think that there needs to be turbulence for the fuel to atomize, but they don't seem to remember that the injectors do that, I'm not running a carb'ed first gen, and the injectors point right into the ports. Maybe it needs to be rough for air flow?
 

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Discussion Starter · #23 ·
I gave it to him last night, should get it back just after dinner tonight. I asked him to clean up the castings at the ends of the runners and TB, where there are big sloppy lines in teh aluminium. He's also going to blast the outside clean so I can coat it or paint it. I'll check the distances on the lines tonight, but I won't be able to install anything until I get the new gaskets to go with it. I'm going to replace my vacuum lines at the same time. I'll do a write up on the whole thing too, though it doesn't seem like a terribly difficult job (of course I saw 3 thread on HT about how to do this in the last 2 days).
Heu, I understand what you're saying about the balance of efficiency/power and getting more from the stock ECU. So, I should expect the fuel economy to go down?
 

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Discussion Starter · #26 ·
Ok, good to know. I notice a huge difference even now when I'm ripping around campus. I've had as low as 22 mpg, normal city driving I get 33-34.
 

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Discussion Starter · #27 ·
Checked the fitting out last night. Seems like I am going to have to extend that plug, but the brake booster line will be ok. I forgot how bad the stock A6 manifold looked! I'll get some pictures before and after. I love the Z6 fuel rail, it looks like an I-beam! My friend also didn't bring back the manifold, should get it tonight or tomorrow.
 

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Discussion Starter · #28 ·
Well I was waiting on some parts, but the local Honda dealer called me today with my throttle body gasket. I also happened upon a new Z6 intake manifold gasket from a friend at the shop. It took a while, there were a couple problems I ran into during the install, but it's on now, and I can't say for sure that it's a lot better, but it does feel a little better in the low end, I actually managed to spin the wheels by accident.
The new mani didn't have a MAP sensor on it. I didn't even notice it wasn't there. It also didn't have the EACV, like I mentioned, and the A6 one didn't bolt up at all. I got both of those from my friend who sold me the manifold. The black plastic thing that holds the wires above each injector won't fit, it bumps into the FPR, but that's ok because... I had to pull the air temp sensor a little out of the harness, but it fits. The booster line fit fine. I'll get some pictures tomorrow, I have to clean it up a little still, the MAP plug needs to be freed up a little bit.
FWIW, the Z6 mani has a bigger diameter. I wasn't sure at first, but comparing the Z6 gasket to the A6 manifold it's pretty obvious. Also, does anyone know if any Z6 powered cars came with cruise control, there's an extra plate with a wire spot on the throttle body, I had another Z6 manifold I was using for vacuum/coolant line reference, and it didn't have it, neither did my A6.
My A6 manifold was filthy dirty, but the ports on the head were just as clean as they were when I put it on after the rebuild in August, I was pretty happy about that. The rear of the bay is really dirty too, but a friend of mine who details cars in the summer helped me clean it up a little, and he wants to fully clean my engine bay. While I was assembling the manifold, he cleaned up my resistor box, some of the fasteners, the new throttle body, and a few other misc things. When it gets nicer I'll have a spotless bay to work in... can't wait.
 

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Discussion Starter · #30 ·
No problems at all. I'm still using this manifold with the Z6 TB, the only difference is the TB mounted MAP sensor. I am now converted to OBD1, but I was running it for a while on OBD0, I don't see how it would make a difference. B series TB's will work, I have a DA OBD0 one I'm trying to sell, I just don't want to use it because it requires a firewall-mounted MAP sensor.
 
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