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I spent several days researching ways to improve the air output on my 76 280z and wasn't able to find a really nice walk through, so I thought I'd share what I did. It looks like most of the people who put 1988-1991 Honda Civic blowers in their Z weren't able to feel a big difference. I noticed some people also suggesting using 1993-2004 Kia Sportage blowers. So, off to my junk yard I went. I found both a Civic and Sportage blower. After comparing the two, the Kia blower seemed better built and had a larger cage so I bought it for $30 and proceeded to my Z. The nice thing about this upgrade is that the Kia blower is roughly the same size, it rotates the correct way, it uses the same wire harness, and it uses the same mounting holes. It just so happens that I have taken my dash out to install a dash cap and add LED instrument lights. I don't know if you could do this upgrade with the dash in place because the entire blower housing has to be removed. This is the guide I followed for removing my dash (PITA!) http://www.classiczcars.com/topic/5934-removing-dash-and-interior-for-paint/ Here is the blower housing location The original blower and cage are on the left. The Kia unit is on the right I removed the foam padding from the fan housing since the kia unit doesn't need the extra spacing. Next, I placed the Kia blower cage over the hole, lining up the bolt holes, and marked the area to widen. I highlighted this in red. Using some aviation snips, I cut out the excess metal. I cleaned up the hole with my Dremel later. I then placed the new Kia unit in the blower housing and secured it using the original bolts and washers. The unit spins free and has just enough clearance The original Z wire harness fits right into the new motor. I plugged it in to make sure it works and it really seems to put out some air. I'll post another update once I get the dash back in.
Stock 280z setups use a vacuum system powered by manifold vacuum to operate various the water cocks and FICD. On a turbo system, without the vacuum accessories like the tank and VCM, using the heater is theoretically difficult, plus the control panel looks out of place in the surprisingly modern interior of the s30. So why not swap out all the vacuum actuation, and the mechanical linkage, and install the modern HVAC controls from a newer vehicle? Has anyone done this? My overall dream is to make my s30 a formidable GT even by modern standards, and it's coming along well. If nobody has tried this, I may need a few pointers as to vehicles with relatively standalone HVAC controllers. A 2000s Mustang comes to mind. The more I can shrink the size the better the end result.