phil280zxt

I believe another safety feature of the ECCS controlled fuel pump is that power to the pump is shut off if the engine shuts down. Important in the case of an accident where you don't want the pump to continue running and possibly dumping fuel into the damaged engine bay.

You might also want to clean the ECU plugs. Reseat them ssveral times to clean off any corrosion.

I've never seen a drain on a 280zx gas tank. You'll have to suction the fuel out of the tank via the filler hose or disconnect the fuel line, hook up your fuel pump to a constant battery source and pump it out.

Have you cleaned and reseated the ECU connectors?

FYI, you can very easily move the pins from your existing connectors to the new 300zx connectors without having to splice any wires. Much quicker swap and obviously better then having a hacked up harness.

I'll check the FSM diagram tonight, but my notes say it is not used.

Blobber, pin 20 was empty in my 81 280zxt harness.

FYI. I also ran an 82 ecu with the stock 81 wiring harness with the dropping resisters still plugged in without any issues. I recently completed the Z31 ecu swap and retained the 81 external resistors.

I'm not familiar with your particular setup, but the fuel pressure drops to zero over night on my 280zxt. When starting it cold, I always turn the key to "on" first without engaging the starter until the fuel pump shuts off, which is normally 5 seconds. This builds fuel pressure and she always starts on the first try after that.

Duo, my ECU connector issue was intermittent. I could go several hundred miles with no issues. Then one day it would start and progressively get worse. It happened one time several years ago on an extended trip. First the feeling that a large hand was holding the car back when trying to accelerate. Over the course of the next few hours it had degraded to the point where I had trouble maintaining highway speed while going up hill. I eventually pulled over, reseated the plugs a few times and the car ran like new for the rest of the trip. I have to say that since the swap I have not felt the car held back at all. If anything it is much more responsive then before. Only time will tell whether these connectors have completely eliminated this issue.

Milen, someone posted this as a possible solution to the change in O2 sensor http://sales.nightrider.com/12mm-18mm-Stainless-Steel-O2-Bung-Adapter_p_48.html Are you have to do any wiring changes to swap over to the 87-89 ear O2 sensor?

That's the same process I used Duo. It's fairly easy once you get the hang of it. I straightened out one leg of a paperclip and flattened it with a hammer until it fit into the connector opening. FYI, I've put about 800 miles on my swap and my Z has never run better. Better idle, smoother acceleration and quicker accelleration. I won't comment on any perceived HP increase, but it does seem to move along quite nicely now....

Curious to know what you were using the tee fitting for on the hose Ioy?

FYI. There is a emergency pop off valve on the intake manifold that will open around 9 psi. You will need to close it off or buy an aftermarket ajustable version before you turn the boost up much higher.

Wait a few minutes, his page is still refreshing...

How are you controlling boost? Manual controller? Electronic controller? It may be the wastegate opening too early. How about the emergency pop off valve opening too early. I believe it normally opens around 9 psi but could be leaking earlier.

My only experience is with the turbo 280zx ECU's. If that is what you are inquiring about you should have no problem running an 82 on your 83 Z. The only restriction that I know of is you can't use an 81 ECU in an 82/83 without adding a set of dropping resistors to the injector harness. The 82/83 ECU's had them in the ECU.

The 81 280zxt AFM inlet size is 3".

Talk about a large capacity gas tank. I once drove a 280zx from Connecticut to Northern Maine on one tank of gas, 540 miles, nonstop. Running on fumes when we got there. I even played with a Porsche for 80 miles or so along the way.

I'm not an s30 expert, but my understanding is that there were only 500 Series 1 240's built. They seem to attract the higher values because of it.

How much shipped to 06415 Zen?

Thanks, I appreciate it Josh!

I'm looking for a used detonation sensor for an 81-83 280zxt. Anyone have one they'd be interested in selling?

Just completed the 300zx ECU/MAF swap tonight. Z started right up and settled down to the best idle I've ever heard! FYI, I was able to transfer all the pins from the 280zxt harness to the 300zxt connectors, so I get the benefit of better connections as part of the swap too!!

Followup on my prior post/question regarding the harness connectors. I've been able to remove the pins from the 280zxt and 300zxt harness connectors without causing any damage to the connectors. The pins look identical. This means that you can remove the pins from the 300zx connector that will connect to existing leads in the 280zxt harness and swap in the pins from the 280zxt harness without having to splice the wires. I kept the new 3 pins needed for the upgrade in the 300zx connector. This way I will get the benefit of using the better 300zxt connector without having to splice the original wires. I had to destroy a connector to figure out how they are held in. It is really quite simple. There is a third row of openings that run down the middle of the bottom of the connector. By inserting a proper sized (very small eyeglass) screwdriver into the slot it will release the metal clip holding the pin in the connector. I can see why the 300zxt connectors maintain better contact then the 280zxt connectors. The holes the pins pass through are smaller in diameter to better center the ECU pin and there is also a plastic insert which keeps the pins/wires in place. I will post pictures later.