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Author Topic: Maf And Ecu Guide  (Read 20922 times)

Offline firefox

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Maf And Ecu Guide
« on: 01:59:18 AM / 06-Sep-08 »
You can only use an 86 300zx n/a ECU and any year MAF

if you have an s12 ECU and a 300zx maf  it will run lean and burn up eventually
if you run a 300zx ecu and an s12 maf  it will run rich and will burn your exhaust valves

YOU MUST RUN BOTH ECU AND MAF

All gen 1 300zx run the same MAF sensor as an s12. The difference is MAF housing size
running just a 300zx MAF is like having a MASSIVE air leak past the MAF.  



if you plan to use a different year ecu..  this is how you do that

basically everything is the same except the o2 sensor

our car runs a 17mm Titania O2 sensor which is a 0-1v voltage based o2 sensor
any other n/a ecu besides the 86 runs a 22mm Zirconium o2  which is a resistance based o2

Titania is a 3 wire (4 pin clip).  positive, ground, and 0-1v feed line which runs to ecu  pin # 24

Zirconium is also a 3 wire.  positive, control voltage, and modified voltage
control runs to pin # 115  and modified voltage runs to pin # 24


to run another year n/a ecu you must
1. weld a 22mm bung to your exhaust
2. cut existing o2 wiring clip
3. check for continuity between pin # 24 and the o2 feed line
4. use that line and connect to modified voltage (#24) line from the new o2
5. run a new line from pin #115 to the control voltage from the new o2
6. run existing power to the new o2
7. cap off ground or ground out on the frame
8. DONE



the turbo ecu can be made to work
i will be covering it later
« Last Edit: 04:51:55 PM / 06-Sep-08 by firefox »

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Offline Arro

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Maf And Ecu Guide
« Reply #1 on: 02:09:42 AM / 06-Sep-08 »
Very nice write-up man. Good job
-Jason Arro


'85 Nissan 200SX (KA24DE)
formerly,
'85 Nissan Silvia RS-X - FJ20 w/ dual Weber carbs
'84 Nissan 200SX Turbo
'85 Nissan 200SX Turbo
Drive it like you stole it, and work on it like you married it - self quote
Quote from: ka-t.org
Hella flush and all associates should be gunned down for brainwashing people into thinking a 225 and lots of camber is proper wheel fitment. THAT IS EASY, anyone can camber a skinny as tire till it dosnt rub. Now fitting an 11 with a 315 on stock fender with reasonable camber, that is fitment. And looks, and performs better than both.
i dont own a s12 at the moment but trying to acquire one to get rid of my s13 hatch
Quote from: SHOUTBOX
[27:54] zastaba: I had a friend touch the contacts on his distributer once
[28:04] zastaba: He did the super jumping up and down pain dance

Offline firefox

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Maf And Ecu Guide
« Reply #2 on: 04:52:31 PM / 06-Sep-08 »
Quote from: Arro
Very nice write-up man. Good job

sticky?  


i'll add the turbo stuff soon

Offline Arro

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Maf And Ecu Guide
« Reply #3 on: 05:33:39 AM / 07-Sep-08 »
No, I'll move it in the "VG30E How-to" section or whatever it's called
-Jason Arro


'85 Nissan 200SX (KA24DE)
formerly,
'85 Nissan Silvia RS-X - FJ20 w/ dual Weber carbs
'84 Nissan 200SX Turbo
'85 Nissan 200SX Turbo
Drive it like you stole it, and work on it like you married it - self quote
Quote from: ka-t.org
Hella flush and all associates should be gunned down for brainwashing people into thinking a 225 and lots of camber is proper wheel fitment. THAT IS EASY, anyone can camber a skinny as tire till it dosnt rub. Now fitting an 11 with a 315 on stock fender with reasonable camber, that is fitment. And looks, and performs better than both.
i dont own a s12 at the moment but trying to acquire one to get rid of my s13 hatch
Quote from: SHOUTBOX
[27:54] zastaba: I had a friend touch the contacts on his distributer once
[28:04] zastaba: He did the super jumping up and down pain dance

Offline FrankensteinZ31

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Maf And Ecu Guide
« Reply #4 on: 07:07:28 AM / 01-Aug-09 »
So say I have an ecu out of an 84 turbo 300zx and I have nistune on it if I wanted to do a rear mount turbo set up?
« Last Edit: 07:10:06 AM / 01-Aug-09 by FrankensteinZ31 »

Offline firefox

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Maf And Ecu Guide
« Reply #5 on: 12:59:46 PM / 01-Aug-09 »
Quote from: FrankensteinZ31
So say I have an ecu out of an 84 turbo 300zx and I have nistune on it if I wanted to do a rear mount turbo set up?

read up on nistune shit and you'll see.


you can use like any maf.

Offline Wolf Dilworth

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Maf And Ecu Guide
« Reply #6 on: 01:32:34 AM / 04-Apr-10 »
Quote from: firefox
You can only use an 86 300zx n/a ECU and any year MAF

if you have an s12 ECU and a 300zx maf  it will run lean and burn up eventually
if you run a 300zx ecu and an s12 maf  it will run rich and will burn your exhaust valves

YOU MUST RUN BOTH ECU AND MAF

All gen 1 300zx run the same MAF sensor as an s12. The difference is MAF housing size
running just a 300zx MAF is like having a MASSIVE air leak past the MAF.  
if you plan to use a different year ecu..  this is how you do that

basically everything is the same except the o2 sensor

our car runs a 17mm Titania O2 sensor which is a 0-1v voltage based o2 sensor
any other n/a ecu besides the 86 runs a 22mm Zirconium o2  which is a resistance based o2

Titania is a 3 wire (4 pin clip).  positive, ground, and 0-1v feed line which runs to ecu  pin # 24

Zirconium is also a 3 wire.  positive, control voltage, and modified voltage
control runs to pin # 115  and modified voltage runs to pin # 24
to run another year n/a ecu you must
1. weld a 22mm bung to your exhaust
2. cut existing o2 wiring clip
3. check for continuity between pin # 24 and the o2 feed line
4. use that line and connect to modified voltage (#24) line from the new o2
5. run a new line from pin #115 to the control voltage from the new o2
6. run existing power to the new o2
7. cap off ground or ground out on the frame
8. DONE



the turbo ecu can be made to work
i will be covering it later


Glad I found this.

Wolf

Offline Grant

Maf And Ecu Guide
« Reply #7 on: 01:36:26 AM / 04-Apr-10 »
Glad somebody found it instead of posting another topic.

My Work-in-progress
The Mods: Blaster SS coil, KA24 Throttle Body (60mm), custom intake piping, 86' Z31 MAF and ECU, 2.5" exhaust from downpipe, "test pipe" replacing cat, shortened shifter handle,  NGK sparks and wires, and dual electric radiator fans.

What I want: springs, shocks, and someday, turbo.

Offline SlickS12

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Re: Maf And Ecu Guide
« Reply #8 on: 05:09:10 AM / 20-Dec-10 »
Just a note on swapping any z MAF for another, according to autozone, the 84-87 MAF is part number 74-10002 but then it changes to 74-10003 for the later z31 models. 

Couldnt tell you what the difference is mechanical-wise between the two, but it sounds like those would be out of the question as a replacement for a pre-87 ecu swapped car.



Post Merge: 05:17:30 AM / 20-Dec-10
Im currently having bogging issues after swapping to an 86 ecu/maf and am wondering if it has anything to do with the maf.  Had no issues before the swap (besides timing being off)

Weird thing is, the maf I grabbed (86 z) has 6 pins on the connector. 

BUT

My existing maf plug (original 88 se) only has 5 pins to connect to

BUUT

Looking at another se, it HAS the wire Im missing...

Im wondering what the heck that extra wire is for and maybe if thats what is causing these issues.

The extra wire is yellow/red and is at the end of the plug. 
« Last Edit: 05:17:30 AM / 20-Dec-10 by SlickS12 »
'84 SRA VG Notch

yah, camber city called, they want you to run for mayor.
Canyon Roads...you go. Faster. And faster. And faster. And then you�re simply existing above an asphalt adventure.

Offline Maxpow

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Re: Maf And Ecu Guide
« Reply #9 on: 12:02:09 PM / 20-Dec-10 »
Yellow/Red going to the 30pin on the ECCS is missing for his maf pigtail as well as there is nothing in the 30 pin on the plug for the ECU. I think someone was dicking around and fucked it up and removed it possibly because I have 2 other SE's at my house to confirm it should be there, as well as a 1988 FSM for the s12 that is saying it should be there.


Any help would be appreciated I am thinking that if we get a 1986 ecu plug and replace the one he has currently with it the car should be working better or at least have all intended stock wires.

Wire is the variable resistance wire coming off the MAF. 88FSM confirms. What kinds of issues could one expect with this missing?
« Last Edit: 12:09:33 PM / 20-Dec-10 by Maxpow »
1987 Nissan 200sx SE ("The Squirrely Drifter") - Totaled and Gone forever
1987 Nissan 200sx SE ("The Weebly Wobbler") - Impounded and Gone forever
2007 Kia Spectra - Fantastic Daily Driver - Custom CAI, NGK wires/plugs.
2002 Hyundai Accent - Totaled and Gone Forever.

MAXPOW'S PARTS SALES: http://club-s12.org/v3/index.php?topic=31350.new#new
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Offline SlickS12

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Re: Maf And Ecu Guide
« Reply #10 on: 12:00:49 PM / 24-Feb-11 »
another question to add that someone might be able to shed some light on..

Ive been searching for a replacement o2 sensor since my old one is basically useless but since I have an 86 MAF and ECU Im not sure which part to use as a replacement.  Can and 86 model year sensor from autozone work even if it has the three pin connector?  I cant seem to find any with the 4 pin connector on it.  any ideas?


edit:

Just because there is some confusion as to what o2 sensor goes with what maf/ecu combo I ask: which one of these: http://www.autopartswarehouse.com/shop_parts/oxygen_sensor/nissan/300zx.html would work with an 86 MAF and ECU?  My first thought was maybe the first and the last ones on the first page?? 

I could really use the help and my gas tank would benifite a LOT if i can figure this out!!!

thanks  :grinwink:
« Last Edit: 06:40:07 PM / 27-Feb-11 by SlickS12 »
'84 SRA VG Notch

yah, camber city called, they want you to run for mayor.
Canyon Roads...you go. Faster. And faster. And faster. And then you�re simply existing above an asphalt adventure.

Offline SlickS12

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Re: Maf And Ecu Guide
« Reply #11 on: 10:26:38 AM / 28-Feb-11 »
**BUMP**
'84 SRA VG Notch

yah, camber city called, they want you to run for mayor.
Canyon Roads...you go. Faster. And faster. And faster. And then you�re simply existing above an asphalt adventure.

Offline Maxpow

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Re: Maf And Ecu Guide
« Reply #12 on: 11:28:41 AM / 28-Feb-11 »
Just find a STOCK SE one.


That's what you want man. The whole point in getting the year 86 is so that we can retain our stock O2 Sensors.
1987 Nissan 200sx SE ("The Squirrely Drifter") - Totaled and Gone forever
1987 Nissan 200sx SE ("The Weebly Wobbler") - Impounded and Gone forever
2007 Kia Spectra - Fantastic Daily Driver - Custom CAI, NGK wires/plugs.
2002 Hyundai Accent - Totaled and Gone Forever.

MAXPOW'S PARTS SALES: http://club-s12.org/v3/index.php?topic=31350.new#new
SEND ME A PMhttp://club-s12.org/v3/index.php?action=pm;sa=send;u=2092 /EMAIL Maxpow99@hotmail.com

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And, I'm going to say this publicly. Maxpow knows how to keep me at bay, while still laughing with him. Take lessons y'all

Offline SlickS12

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Re: Maf And Ecu Guide
« Reply #13 on: 11:51:17 AM / 28-Feb-11 »
And pay $8x.xx for an oem replacement? Comeon man I thought you knew me better than that, Im looking for the least-spendy option. 

Id go pull one from the yard if I wasnt totally sure it wont work but theres so many different companies out there making and selling god knows what.

If possible it would be nice to find a (working) universal replacement.... like the ones in the link.  what do you think about that first one for ~$50?
'84 SRA VG Notch

yah, camber city called, they want you to run for mayor.
Canyon Roads...you go. Faster. And faster. And faster. And then you�re simply existing above an asphalt adventure.

Offline Maxpow

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Re: Maf And Ecu Guide
« Reply #14 on: 12:11:21 PM / 28-Feb-11 »
And pay $8x.xx for an oem replacement? Comeon man I thought you knew me better than that, Im looking for the least-spendy option. 

Id go pull one from the yard if I wasnt totally sure it wont work but theres so many different companies out there making and selling god knows what.

If possible it would be nice to find a (working) universal replacement.... like the ones in the link.  what do you think about that first one for ~$50?


Yeah I know better. That's why you can't buy cheap shit. Throw 80 at it and not have to do it for a long time or throw 40 at some junkyard/cheapo that doesn't fit the application correctly, never have proper air/fuel and never run correct.

I'm all about getting it done right as cheapy as possible, avoid the jank. That never went well for us ;).

IE: Quicksteel.

Post Merge: [time]10:11:50 AM / 28-Feb-11 [/time]
parts numbers are parts numbers by the way, its not gonna be more just because its for a s12.
« Last Edit: 12:11:58 PM / 28-Feb-11 by Maxpow »
1987 Nissan 200sx SE ("The Squirrely Drifter") - Totaled and Gone forever
1987 Nissan 200sx SE ("The Weebly Wobbler") - Impounded and Gone forever
2007 Kia Spectra - Fantastic Daily Driver - Custom CAI, NGK wires/plugs.
2002 Hyundai Accent - Totaled and Gone Forever.

MAXPOW'S PARTS SALES: http://club-s12.org/v3/index.php?topic=31350.new#new
SEND ME A PMhttp://club-s12.org/v3/index.php?action=pm;sa=send;u=2092 /EMAIL Maxpow99@hotmail.com

Certified Member of SoCal Parts Alliance.

And, I'm going to say this publicly. Maxpow knows how to keep me at bay, while still laughing with him. Take lessons y'all

Offline SlickS12

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Re: Maf And Ecu Guide
« Reply #15 on: 04:59:35 PM / 28-Feb-11 »
IE: Quicksteel.

hey that shit worked! lmao the only thing Im hung up on is the fact you can use an se o2 sensor w/ 86 components, why not use an 86 300 one??  it just makes sense it would work and it is oem (kinda w/ mods) and CHEAPER! ;)
'84 SRA VG Notch

yah, camber city called, they want you to run for mayor.
Canyon Roads...you go. Faster. And faster. And faster. And then you�re simply existing above an asphalt adventure.

Offline Maxpow

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Re: Maf And Ecu Guide
« Reply #16 on: 05:27:33 PM / 28-Feb-11 »
you're positive its the same threading and whatnot?

Try it. Then we'll all know.
1987 Nissan 200sx SE ("The Squirrely Drifter") - Totaled and Gone forever
1987 Nissan 200sx SE ("The Weebly Wobbler") - Impounded and Gone forever
2007 Kia Spectra - Fantastic Daily Driver - Custom CAI, NGK wires/plugs.
2002 Hyundai Accent - Totaled and Gone Forever.

MAXPOW'S PARTS SALES: http://club-s12.org/v3/index.php?topic=31350.new#new
SEND ME A PMhttp://club-s12.org/v3/index.php?action=pm;sa=send;u=2092 /EMAIL Maxpow99@hotmail.com

Certified Member of SoCal Parts Alliance.

And, I'm going to say this publicly. Maxpow knows how to keep me at bay, while still laughing with him. Take lessons y'all

Offline silverton

Re: Maf And Ecu Guide
« Reply #17 on: 05:56:15 PM / 28-Feb-11 »
Just out of curiosity, what kind of gains can be seen from this?  A bigger MAF does flow more air, but will it be more of a placebo effect?  Or does doing this make running nistune easier and that's the purpose...?  I see they have the z31 listed, but not the s12...
-Dennis

BoostedVG (in regards to people hating on the VG) - Me thinks they were not the mechanic they thought and blamed it all on the engine.

Colonol Gustard - youre one of the few people that represent the s12 chassis like a boss!

Offline Maxpow

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Re: Maf And Ecu Guide
« Reply #18 on: 08:55:08 PM / 28-Feb-11 »
I have 6 setups for sale by the way.
1987 Nissan 200sx SE ("The Squirrely Drifter") - Totaled and Gone forever
1987 Nissan 200sx SE ("The Weebly Wobbler") - Impounded and Gone forever
2007 Kia Spectra - Fantastic Daily Driver - Custom CAI, NGK wires/plugs.
2002 Hyundai Accent - Totaled and Gone Forever.

MAXPOW'S PARTS SALES: http://club-s12.org/v3/index.php?topic=31350.new#new
SEND ME A PMhttp://club-s12.org/v3/index.php?action=pm;sa=send;u=2092 /EMAIL Maxpow99@hotmail.com

Certified Member of SoCal Parts Alliance.

And, I'm going to say this publicly. Maxpow knows how to keep me at bay, while still laughing with him. Take lessons y'all

Offline Ju_S12_Turbo

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Re: Maf And Ecu Guide
« Reply #19 on: 02:42:22 AM / 03-Mar-11 »
I run the same set up on my car, I had to run hella timing to get it to the right marks. But I passed CA smog (Sniffer/dyno) with it on. I had a friend over look the cone filter and missing Charcoal canister.

Edit: also I am pretty sure the s12/300zx o2 are the same BUT the wire length is different (300zx is shorter)
« Last Edit: 02:43:23 AM / 03-Mar-11 by Ju_S12_Turbo »