snwbrderphat540

hmmm.. curious... soo mega squirt is how most people go standalone.. are there any direct plug in standalones to the stock ecu harness? i dont think there is but doesnt hurt to ask. i know alot of cars have it now an days... kinda pricey though

edit: ok so im getting me a pallnet fuel rail so i can stick my friends 450CC DSM injectors in my car.. a dirt cheap but amazing upgrade... what will i have to do to my harness/injector connectors to get this to work. you guys know? any one... haha.. otherwise im gona have a fun time venturing into the unknown.... that or maybe search hybridz might be in there somewhere....

NismoPick

Harness connectors are the same... you need to know if they are low or high impedence injectors. And what ecu is going to control them?

snwbrderphat540

your faces ECU.... haha... so far stock zx 2+2 5speed 83 ecu... gonna look for turbo one maybe that or just go to megasquirt. hmmmm... i dont know if they are high or low... ill ask arthur he pretty much know everything about DSM's... that or konieko he is a great car and DSM elctrical guy....

NismoPick

stock ecu can't handle 450cc injectors... not even close. You'll need a SAFC or MegaSquirt to run them.

snwbrderphat540

neither ecu? hmmm.. safc i might be able to borrow if konieko aint using his with hos car torn apart for the next year... they might just be using DSM link though.... jsut be temporary till megasquirt though so he would get it back. lol...

Bleach

factory Nissan ECUs have preset information on injector size and other factors. The MAS vs the AFM helps a lot withe the Z31 ecu but it won't overcome the larger flow injectors.

Megasquirt is programable for any size engine and any size injector.

Feel free to do research then start a thread about Megasquirt on this forum.

captken

I am following this thread with interest. I was wrong on my advise about NOT using dropping resistors for the stock injectors on our cars. I was able to find out, doing research, that the '88 up cars used high impedance injectors, and that the ecu will not work with the stock injectors without stepping down ohms.
I stand corrected. Year 1988 was when the change to high impedance injectors was made.

kenny

captken

Books before there was the internet....
Well, seek and ye shall find...from the fsm. The location and line drawing of the '81 resistor pack.

thumnails...wish I could upload bigger images. I hope I don't need to add arrows or pointers....look at the eccu's location, just above it.

captken

Installed in '83 turbo car's wiring harness. Shrink wrap after solder, wrap with good quality electrical tape, I use 3M brand. Expensive...for tape...Wrapped everthing after making the connections and swappint #2 and #5 injector leads.

The "resistor pack" that you make is the rectangle of black after the connector, just before the main wiring harness loom, same location as the '81 turbo car.
hope this helps,
kenny.

captken

Stock O2 sensor has one wire.

We need to figure out how to wire in the O2 sensor from an '88 turbo....

easy as pie.

kenny.

NismoPick

Doesn't the 88-89 have the 3 wire O2?

Bleach

ya, I'm going 3-wire. 17mm thread instead of the 22mm. I'm making a downpipe anyway so I'll incorporate that into my exhaust.

I'm not sure if that resistor pack is a central item for all six injector signals to run through. In 1981 turbo there is only one bank of six. In the 88 turbo the ECU runs two banks of three under partial throttle and less than 3000 rpm so for best performance I should not just mesh all six signals together. I'll run individual reistors. then just tape them all together.

captken

Well, mine does! Plug and play baby! JWT POP CHARGER PROM. Center of picture. White sticker, cannot do macro with this camera.
kenny

NismoPick

Cool... but do you have a Romulator to burn your own changes? I know JWT will charge you to make an updated chip.

captken

Plug and play for me. I want to enjoy the car, not tune and retune it.

The Superchips programmer is awesome on my Ford 350 Flatbed Powerstroke dually, just ask fubar.
The acceleration is faster than anything I own, I hope the turbo car will smoke this truck....It will already smoke fubar's car...a N/A zx. A one ton truck....he will say he kept up, but I was baiting him...truck had wheelbarrow and equipment in the bed, rakes, hoes..lol...hedge trimmers, chainsaw...ect....

The truck is stock except for the programmer. Jim Wolf Technology programmed this eccu. I cannot imagine the outcome of installing this setup on my car which will produce hp and torque figures [with the Superchips programmer] that match my truck. In a vehicle which weighs less than 1/3rd. Megasquirt=Megaheadache.

You gotta pay if you wanna play....

Bleach

Last summer NismoPick sent me his spreadsheet on the 1984/85 Z31 ecu wiring he had come up with. I went through the 1988 300ZX factory service manual and made my own notes and compared it to the earlier version.

My findings show that the wiring is basically the same aside from the O2 sensor. According to the FSM, #2 and #5 injectors should not be swapped. It specifically says the switch in wiring is for the non-turbo 300ZX only.

"Z31" in the title referrs to NismoPick's contribution on 1985 ecu
"1988" ecu list is my addition

enjoy!