Ecu tuning 2002/2003 g35sedan (very technical)
 

Could use some knowledge junkies on this one.



My current situation with ecu stands as follows:


I have the early model ECU harness the one that nissan used on the 2002/2003 Maxima. The connectors are completely different than the ones from 2003 + G35's.

There was a thread on frenzy which some have followed yet since I moved i stored the wiring and completely forgot about it till recently that I was cleaning out old junk and :eek: found the harness..

a bit old but anyone want to look here you go (pics somehow got erased)

http://www.mygfrenzy.com/forum/showthread.php?t=8708


I have a couple of questions regarding current ECU mods.

Till about 30 minutes ago I thought that the UTEC was a complete EMS. I really thought it took over the entire ecu and allowed you to use the stock functions of the car. With said I then researched the AEM EMS, and noticed that AEM is not working with the G/Z in the EMS side of business. So that leaves me with 2 more options. HALTECH or Upgraded ECU/ADAPTER

With those choices brought up my question then stands is the Haltech a FULL EMS? By full I mean it will completely replace the ECU from engine functions, lights, wipers, horn, CEL's, RPM, TACH...

My goal is to have a ECU that allows stock functions of the car but allows me to tune the car to my specifications.

I understand that Uprev has the Osiris upgrade, but again the ecu i have is not supported.

The next option on the table is to go to the dealership get a 2003 ECU (which has the correct plug) have Richard of AutoSport wiring make an adapter from my harness to the new ECU and then use an Osiris to program the engine.


What is the major difference between the ECU's other than the connectors?

I know that one of the ecu's (not sure which quite possibly the new ones) have the feature that it continues to learn a persons driving habbits and adjusts by monitoring the oxygen sensors.

Will I have to upgrade the wiring harness from the earlier models?

Will there be a problem with the chip inside the key?



What other FULL air, ignition and fuel tuning options do I have (other than Technosquare)

I would do the technosquare option but I prefer the simple fact that today I can go to the dyno tune the car to my wants and then take the car to the track and revert the car back to it's elder settings, or even putting the car in valet mode, etc...


Ideas anyone?

Any one else with potential ideas, or am I the only one interested in Pioneering this ?

Updates
 

Ok, for those whom have been following (I've noticed the views).

Here is the new idea:

I consulted the mechanics and service techs @ South Motors Infiniti here in Miami, FL. Yes, you can use a 2004 ECU on a 2003 G35; YOU MUST have the cables crossed over to allow that ECU work. Once that ECU is operational, then you have to relearn everything. Throttle, idle air, KEY CHIP, etc...

With that being said I have yet to contact UpRev, but I am sure once that ECU is in place they can then provide tuning abilities.

Richard Welch of Auto Sport Wiring is again reviewing the tasks to be involved and I must say he is a SUPER guy! If this can be pulled off it'll be nice for the 03 Sedans on here that want to put on cams and actually TUNE the engine, have the ability to change maps/tunes via cruise control, go FI, etc..


TTRANK, do you have any experience with the UTEC? Is it any "better" than the Osiris system?

Any tech heads DROP IN!!! :)


I have attached schematics of the wiring crossovers and OEM pin outs to each respective ECU.

The pin outs are directly from the tech manual from Nissan/Infiniti just made easier to read.

I've done alot of research on this before. I asked Cobb to do it and they planned and then quit. UpRev was going to try it if I sent in my ecu for them to flash. Experimental. I said forget it.

Guys on the maxima board have already custom made a maxima harness (ie.. early g35) to hook up to the UTEC. But you are right, it does not have full reflash capability like Cobb, Uprev Technosquare.....

If you are going FI, then you're going to have to probably hardwire in a Greddy, UTEC, Haltech etc.... and bite the bullet.

If NA, I would just send it in to Technosquare. That's what I did for my early G35 sedan.

Technically, Uprev's reflashes have more control than the UTEC. Even for FI they can handle alot of power capabilities. But alas, our versions aren't supported. Too bad as they could pick up alot of the maxima crowd along with the early G35 sedan crowd. Probably Altima guys too

Funny enough 5 hours after my proposal to Richard @ AutoSport someone from the Maxima family contacted him to attempt something similar.

The Maxima connector is the same but some of the pin outs are different.

Problem with the Greddy is you only have 2 Dimensions of tuning, air/Fuel. You dont have control of timing. the Ecu would overide it. You can't alter the max values of the Throttle our cars stock only go to like 80% throttle, rev limit, etc..

The Haltech is an ARM and a Leg. No doubt a full stand alone is the best for any performance gain, problem I see and perhaps __Jb can confirm or rectify... that going FULL stand alone you loose the chip ability, and few other essentials as cruise control.

attached is the maxima pinout

I'm is SoCal, so i just drove to Technosquare

How much was your tune at technosquare and what was the difference between the $300 and $500 dollar one

Haltech is not a full stand alone, it still uses the factory ecu for certain functions.

Not entirely true. I have a Greddy Emanage wired up since there were no options with COBB, UTEC (without wiring harness), Osiris, etc.

The Greddy allows you to have full control over TIMING and AIR/FUEL when at WOT. Additionally, if you have the Emanage Ultimate you can bump up the rev limit. Its been done several times, I think the maxima guys were the first to do this. Also, the EMU has a knock sensor, dual map quick flip switch.

As for the TB going to 80% there is no control of that yet (at least that I'm aware of) but I've also been told that some tuners looked and did not find this 80% Throttle suppression.

iirc Emanage (blue) only allows for Air/Fuel. Timing is not controlled.


I've been busy but plan to send out the harness this week so Richard can get started.

Following with interest but TBH if I really decide I want a tune I'll probably just ship my ECU off to TS and drive the wife's SUV for a few days.

I think emanage only has timing retard and not advance?

I believe so.

You sure Uprev won't support your ECU? In the manual it mentions that your ECU (gen1) is supported but just won't have map switching capability. There is another document about rewiring the CAN bus on the '03... but maybe it applies only to Z's?

Going to bump this up.


At some point when I start doing more in the way of engine mods, I'll be interested in tuning, but I'm in the same boat (03.0 w/ old computer)

I had asked if it could be adapted to the newer ECM in another thread, but got no responses.
Have you made any progress on getting an adapter made?

I guess if someone wanted it bad enough, and could get their hands on a junk wiring harness, they could de-pin the connector.
But that would be a lot of effort for something that might not even work properly :/

I have the entire pin out posted up there...

I forgot about that... out of sight out of mind :(....


I will definetly make it a priority to get this done soon

Emanage (ultimate or blue) both will allow you to tune both air/fuel AND timing. In order for timing to work with the BLUE you will need to have the ignition wire harness. If you have that you can fully tune timing.

I picked up 30 tq and 20 hp with my tune on the eManage.

So is there a small group of 350z out there with the oddball ECU as well?

We hear about it on our G35s, but where are the "pissed" early ECU 350z drivers?

^I didn't think this was an issue for coupes or Zs

any updates??


Here are my 2 cents not that anyone cares


This can be done relatively easy, I'm currently working on it for my maxima but its easier for the 03 g sedans because they are actually set up for the newer style ecu (black ) connector they just got shafted on their ecu. While the maxima ecu actually controls a few more functions and does a few things differently. A 03 g sedan ecu has the same plug type as a 02 03 maxima but it actually dont function the same.


The only issue i seen when i looked into it was the NATS system, even that might work just fine.

What you would need far as i knwo ( i dont have a 03 g sedan to test on)

new black connector style ecu, one that uses factory narrow band o2s

a adapter harness that converts your factory harness (grey) to the new black ecu and puts the wires in correct location.

Then depending on NATS working or not, you might HAVE to get osiris , which could disable nats if it could not function normally. (I think nats will work just fine itll just have to be programed at the dealer)



In the NEAR future im going to explore this more, but id need someone with a 03 g sedan to test.

^I'd buy a newer ECU if there was an adapter harness available.

If its possible ill def do it. It def wont be any harder than trying do it in a maxima!


Anyone with a 03g sedan local to NC?

didnt have issues on the 350Z. when the first 350Z was released the G35 sedan had already been out for 6 months. Nissan "threw" it out the door with the older ECU. Clearly they wanted future models to have the newer and better ECU just didnt care for the new buyer in late 2002 :'(

Hey SurraTT - I'm in Raleigh with an 03 doggy door. I'm a little scare of what you're going to do with the ECU:confused2:

Ohh ok cool, i just moved from Burlington to Greensboro so im a lil further away now. Haha. well basically ill make a harness that adaptes your old grey ecu harness to a new plug the black one, and use a black connector ecu.


I'm not sure how familiar you are with this stuff, and if your car is modded and you want to tune or not. If so a ecu swap to the black connector would be perfect. send me a email if youd like to talk about this more and possible test it out.

Updates are:


Going Full Standalone..

This won't work as the newer ecu handles less functions than the 2003 so you'd have to rewire the entire car.

What about a partial piggy back using the newer ecu?

What would those be?


What standalone are you going to do?

???


Any details other than it wont work and need to rewire entire car?

lol thats linked to my thread, if your going by my thread on my car saying it wont work on g's with out rewiring the whole car. then this thread is far from (very technical)

simply not the correct answer to why this wont work.

If you look at the FSM you will see the 03G "doggy door" i guess thats talking bout the trunk?? anyway i call them early 03 g sedans lol. That grey connector ecu does actually not control as much as the maxima version. So im not sure if your getting your information from my maxima thread.


Its possible its not too hard to do, i really need someone with one of these cars, that wants to do this, that is would buy a ecu, and be willing to try to program nats, if it worked great, if not nats would need to be disabled via osiris. For that person i would offer a free harness to make this possible.

The sad part is that it's correct. Although it does NOT handle all of the functions like that of the maxima's. I did check the FSM for the 03 and fsm for the 05 and the 05's handle more functions. So obviously something is up.


Before I spend more time and money on experimenting, I rather go with something that is proven which will cost me the same and will work. I rather go with Haltech.

I have the autosport harneess

^Of course the 05 is different. Everything is different on those.

You need to be comparing to an early 04.

Makes no difference

Ecu's between 2004's and 05's even 06's are the same.

^Are you sure?
The transmission control changed significantly both in functionality and physical design with the 04.5
Plus all the changes in 05/06, including the rev-up.
Yet the ECU is identical?

hm, i will def figure it out, just kinda hard without having the car lol

did you buy a 05 ecu??

the autosport harness? the black style one?


edit, cost the same as haltech? If i was to do this swap on a G depending on what lvl of osiris, or if nats coudl be programed with the new ecu, it could be a fraction of what a haltech cost


They are not the same. 2004 uses factory narrow band o2 sensors while 2004.5 and up uses factory widebands



now if your a A/t it might throw a lil curve into it. but if your 6spd, i think this swap is not that bad at all.

If you want to try to get it working, id be willing to help all i can man. If u wanna email/talk on phone just pm me.


Someone that has a early 03 g sedan is going to have to step up and try this swap. I'm willing to totally help all i can and even make the adapter harness free of charge for being the initial tester.

I have an a/t

The A/S harness is a one off custom for the early sedan. Richard only made one because of the complexity of it. I happen to be the owner of that only one.

The wideband issue is not really a problem because if you can install an additional O2 sensor and wire it to the ecu it would act as if it were in the 2005. But again, we have to begin adding costs.

Just so we can keep both threads accurate and up to date.

have any pics of the harness, and ecu?



are you looking for a used haltech or going to go new?

has anybody ever swapped just the harness and ECU to test?

You'd have to swap the console as well......

I'll take a picture of it when I get home.


With ECU's I'm picky. I rather buy it new.

what console is different?

oh ok cool

and new ecu??? sorry man thats a FAIL


ive purchased 4 ecu's all for <$100 each.



why would you not use a used ecu? no wonder you could spend about the same amount of money and get a haltech??? ecu from dealer is 500+ right??


edit went and priced new ecu just for fun 350z ecu, from Courtesy 675-789 ish.

http://www.courtesyparts.com/kb_sear....php?keywords=[22611]+\%28z33&cPath=714_715_743_747

The link you sent with the ZIP file just has FSM pin outs. ??


im still not sure why you think it wont work??

I have a corporate account with Nissan/Infiniti. I can get just about anything cheaper. But going with ECU's it's best to go with a virgin system (with warranty)

Not that it will not work. Just the amount of energy that it takes to make it happen I rather go full standalone. It'll give me more control over the engine than the OEM Ecu can. In the event I decide to go boost, I'd be able to program the system to work boost by gear, etc...

Anything can work with the right amount of money thrown at it correctly. But is it cost effective?

I can see where your coming from and for you a haltech is most def what you need to do. But i'm trying to make this possible for everyone as i dont even have a G.

Yes i do believe its cost effective on thats if you get the parts cheap enough. I'm not sure how good a corporate discount is but it would have to be a lot to make this cost effective over just getting used parts.

Depending on how you want to tune, basic reflash, full on tuner version. This swap can be done fairly cheap. Also once you have the black connector ecu you can run whatever system you want. A really soild system is a reflash on the stock ecu for speed , dtc disable, etc, then a haltech. Also that way the haltech retains its stock harness, if it was ever sold or something.


On a side note are these early G's the ones without HID's??? Its amazing how infiniti done that, while my 02 maxima has factory hids.

^Mine doesn't have HID, but it was an option even on the early ones.