NewZed

This one. Displayed as a link so that you can see the address. Might be the junk at the end. Looks like some truncation and mangling has occurred. I tried modifying the end of the address but it keeps adding the junk symbols. Might be a length problem. - http://forums.hybridz.org/topic/46043-using-a-degree-wheel-to-degree-in-your-l-series-cam…/

JMortensen has written about how the early 240Z's had incorrectly drilled strut castings. The spindle pins are off the design axis. Here's a start -

Even the ECCS system is not too complicated to follow the wiring diagram and figure out how the injectors get opened. I always get in to trouble when I only follow instructions. Are you sure that they're not just stuck open and the noise is the fuel pump, or FPR? The typical failure mode of the 280Z EFI ECU is to flood the engine, due to something in the ECU shorting the injector power to ground. You might unplug your ECU and see if the injectors still spray. If they don't the problem might be in the ECU. If they do, you have a short to ground somewhere else. That's the key to understanding injectors. They open when the power is grounded. You could also unplug all of the injectors, electrically, and see if the buzzing noise is still there. If it is, it's not the injectors. You could disconnect the dropping resistors to remove power and do the same. Lots of ways to troubleshoot. And your description of what's happening isn't super clear. Were you holding the key to Start while the injectors were spraying, or did you let go and it was at On, or was it off? Lots of "after cranking" possibilities.

A ton of good pictures and stuff in the FSM.

Looks like your pinion haft was about to blow a hole in something. It's trying to get out. It happened to me long ago, on a GM diff. Blew a hole in the diff cover. Look at how the propeller shaft turns those gears and how they work. Ponder how the gears could turn and slip on the broken teeth when the car is not moving.

Yes. The R180's and R200's are notoriously loose and clunky diffs. Lots of slop in the gears, and splines. In neutral there's no load. Good luck. You'll find it.

The driveshaft could easily transmit motion to the diff, making the pinion gear bounce off of the ring gear. The noise might be from the diff but the problem is probably in the trans or converter. There's no way the car would move like it does if you had a tooth missing. And at zero MPH the pinion gear would have to be slipping over the ring gear. That would make a terrible grinding noise. Put your camera under the car while you do the zero speed load test. You'll probably see the propeller shaft bouncing back and forth a degree or two. On the other hand, taking things apart is always a good learning experience. You'll want to know your diff condition anyway. The R180 really is small for a 350.

The swap from front to back sounds like a good idea. Is the height difference what you want? If the three holes are the same dimensions, it should work. You'll just have an extra, useless, bearing in the insulator. As far as handling, you're not changing any geometry just the starting point of the struts. I found that lowering, in general, improves handling, by lowering the center of gravity.

I looked through the thread and can't tell exactly, if the car has an automatic transmission. But, if by "not moving" you mean zero MPH, then the problem is probably in your torque converter or transmission. The wheels, differential and various drive and propeller shafts are all solidly locked together. The only part that can move with the engine crankshaft is the torque converter and transmission input shaft, if the car is not moving. When I watched your video "torque converter" popped in to my head as a cause. It might be as simple as loose torque converter flex plate bolts. I would check them soon, the beating will be damaging.

Quite a few people on classiczcars.com are using it. Not to send a Hybridz member away but that's where the 123 action is.

That makes sense. MS is developed enough to have an output for that function, the same signal that they use for their data logging and visual software. Good luck.

You're on the right path, taking the time to understand the details of how your tach works. But, there are still coils involved with your MS setup. I don't know how many, but if it's not one supplying six spark plugs, then it's probably three (wasted spark) or six (COP). So, the Technoversions unit has the most promise, because if you can set it to a multiple of six, and use it on one of the single coils, then you can get the tach to read right. The MSD adapter just conditions the signal for a single coil. You can't change the multiple it sends to the tach. It won't work unless you do some trickery. And it often does not work for people, even on applications it's designed for. I think that it should be possible to gang the triggers from all of the coils in to one trigger wire and use that for a single coil type adapter. You'd probably need some resistors and diodes to avoid cross-talk and noise but it should be possible. I'm kind of surprised that nobody has rigged one up, the concept is pretty simple, the tach needs are well known. If I had MS I'd send that guy at Technoversions and email and see if he'd be interested in expanding his product line to handle wasted spark and COP. He'd have a pretty big market, I think.

Error code "Too many redirects" comes up if you click on somebody's announcement.

K&N are not "regular" oiled filters. They're worse oiled filters. Really, all you're doing here is comparing two turds. Which is the better piece of junk.

.....no..... 280ZX's don't use a mustache bar. You need a 280Z bar. But you can use a 280ZX dif. You need the piece that connects the two drop down supports, that the back ends of the control arms, with bushings, are attached to. It is s curved for the R200, your R180 piece is straight. People call it the dogbone. And a 280Z R200 front differential mount. Or an RTz design mount, which he designed for V8 applications. People have finagled the R180 parts to make them work but getting 280Z parts is easier. Here is a link to a guy who sells the RTz style front diff mount. https://www.technoversions.com/ Since you're under there you should really just check all of the rubber bushings in the area. There is a lot of rubber that is now dried out and aged. Post up some good well-lit shots of the the rear suspension mounting points and the diff and we'll pick it apart.