Captain Obvious

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Captain Obvious last won the day on May 30

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  1. It doesn't spell it out, but they offer two systems... 1) What they call their "complete" system, and 2) what they call their "underhood" system. My belief is that the underhood system includes everything you need except the evaporator (and expansion valve), and the controls. I think it's got everything else, including the interconnecting lines.
  2. I've got a parts ZX here that I could scavenge parts from, but wouldn't that have the same parts availability and old technology issues as a stock Z system? I was thinking (hoping?) that something from a Sentra or something ubiquitous like that would be cheaper, more reliable, more efficient, and easier to find if I need another one. As a matter of fact, I've already got a stock 260Z mounting bracket and compressor. I was just thinking that I could do better?
  3. Thanks all. Jbond, I think I found the system you installed: http://autoacsolutions.com/store/products/1976-1977-1978-datsun-nissan-280z-ac-underhood-package/ So why is it that the Sanden 508 compressor is so popular? Is that a good one? I did some digging at rockauto, and clearly one of the stumbling blocks for slapping a different compressor on there is the belt configuration. Everything new runs the multi-groove belts instead of the old school V that we use. If the system was still under pressure, I would trust a compressor from a junkyard. I don't think I want to put in a used compressor though. That's something that I want new. So, if I can get a cheap compressor from a yard, I wonder how much I would spend on getting custom lines made up. Question is... If I use a cheap junkyard yard compressor, but spend real money for an evaporator and getting custom lines made up, would it have just about the same cost as buying one of the pre-packaged kits?
  4. Do we have any A/C experts in the house? My 77 280 came without A/C and I'm working on adding a system. I've got the interior stuff done and have turned my attention to the stuff in the engine compartment. Has anyone got any experience with using parts from a different vehicle and adapting them to the Z? I'm assuming the technology and compressor designs for the newer stuff (designed for R134) is better than the stuff from forty years ago. Newer, lighter, more efficient, cheaper? I could "relatively easily" fab up a mounting bracket to mount a different compressor where the stock one goes. Use a ubiquitous compressor from a Maxima, Civic, or Corolla instead of the stock one? How "matched" do the components need to be? Compressor, evaporator, condenser? Would it even work right to use a compressor that wasn't designed to be used with the stock evaporator and expansion valve? So what I'm asking here is.... Has anyone done anything like this, or am I on my own breaking new ground?
  5. My original diaphragm was OK, so I've got a spare one of those. What I would really like to have is a new valve assy. I found that my original one looked better than the crappy looking one that came in the "rebuilt" booster, but it didn't work right. So I'm running the crappy looking (but functional) one that I harvested from the rebuild. I'm positive they used the same valve in many other cars, but I just don't have any source to confirm. I can't rip a bunch of boosters apart in the junkyard just to check.
  6. Man, he's got Z-itis bad. Really bad. Multiple generations bad! Hope the two of you find good homes for the thinned herd. I would be skinned alive if I brought something else home, but... Have you got any pics of the GTO stuff? I just like looking at them.
  7. I'm positive you wouldn't have sold more than a couple. I assume you never turned up a source for the internal rubber parts or the end seals? Speaking of such things... I'm positive the Z isn't the only car that used those internal parts. Anyone have any theories of other cars that may have used the same internal conponents? Something easy to find like an old Maxima or Sentra perhaps? Anyone know if Honda or Toyota used Hitachi brake components?
  8. That's fantastic!! You must be so happy!!
  9. Haha!! I'm not sure it's worth a rung of the cool ladder, but I've only ever bought two brand new vehicles in my life off the dealer lot, and this is one of them. She's an antique at this point! I'm not sure how much longer I'm going to retain ownership though. Riding around seeing everyone in their SUV's driving with one hand on the wheel and the other hand on the smartphone... It's out of control. I'm the one that's the most vulnerable. I used to ride more, but phones and inattentive drivers have taken most of the joy out of it.
  10. Now there's some good documentation for ya!! Way better than what I could turn up! Kudos!! Phil, So the connector in your original pic goes to the speed control switch, right? Not the resistors on the blower housing. If that's the case, then I suspect that B/W is for the A/C system.
  11. Glad to help. The documentation got way better as the years went on. Those first couple years were sketchy on some of the sub-systems. By the time they got to 77 (my year), things were pretty good. Interesting to note, however, that even in 77, they used a similar sub-cable for the HVAC system. The colors and positions of the wires are different, but the concept is the same. So if that cut-off blue wire is supposed to provide power to the blower fan, then the other end should plug into a bullet connector on the dash harness. Have you found the other end where it is supposed to connect? I believe it should be blue as well.
  12. I haven't measured it, but I'm surprised at how low your AC readings are for the VR output. Kinda makes me wonder if maybe you're dragging the voltage level down by asking the coil to drive something of lower impedance than it was designed to interface to. In your drawing above, you mentioned "Hall pickup"... If the coil signal input of the system was designed to be driven by a Hall Effect sensor, then it's conceivable that it's expecting to be connected to an active driver instead of a passive pickup? Maybe they're driving a pulse transformer or the LED input of an optocoupler with the ignition input signal, and the VR pickup just doesn't have the ummph to provide the power at low RPMs? If I were designing the ignition input section of a system like that, I would want to provide galvanic isolation of the signal pickup, but I would buffer it on the non-isolated side first and then run it through an isolating device like an optocoupler or transformer... AFTER I had amplified and buffered it. Kinda hard to test (because the distributor has to be spinning), but I wonder what the pickup coil signal looks like when it's NOT connected to the Spitronic module. If it's a lot higher when running open circuit, then maybe the Spitronic input impedance is dragging it down.
  13. And (just because it's Z related?) here's a neat shot of my home built level manometer being used to sync my cycle carbs. And you can see a corner of the Z in the shot as well!! Nurse!! IV STAT!!!
  14. That bottle manometer style won't work for the Z application, at least not in stock form. In order for that device to work, you have to be able to isolate the engine side (high vacuum side) of the two carbs from eachother. Problem is that the Z carbs are tied together by the balance tube. In order for that manometer style to work, you would have to block off the balance tube passageway somehow. You would also need vacuum ports on the engine side for both carbs, and I don't believe those exist for the round tops. IIRC, the front carb has a vacuum nipple, but it's ported vacuum, not full vacuum. I don't believe the rear carb has any provision at all for a vacuum connection. So the bottom line is in order to use a manometer style device like that, you would have to disable the balance tube and you would also have to come up with a way to supply two vacuum nipples, one on each intake manifold. (The aspiring creative inventor could suggest that a pair of nippley devices could be bolted to the intake manifolds where the balance tube usually goes that would both segregate the intake vacuums AND provide vacuum measurement connections at the same time.)
  15. Providing closure to this project. My power brakes work again, and the booster holds vacuum overnight, so I know it's leak-tight. I put my sticker on, and I'm calling the project officially "done". Even though I'm getting pretty good at it, here's to hoping I don't have to open one of these things up ever again: I sure wish I had a source for the internal rubber parts that wasn't simply to buy a "rebuilt" unit. I know they're putting new rubber parts in the rebuilds, so I know they're available. Just not available to me without buying a whole unit!