So i have heard from a couple of people that the earlier g35 sedans had an almost untuneable ECU... is this true and how do you tell if you have one? What exactly are you limited on if your an unfortunate owner of one?

 

^PM me your VIN number and I'll let you know if you have the old (near-impossible to tune) ECU or the new one.

A swap may be possible, read this thread: http://forums.maxima.org/all-motor/6...-ecu-swap.html

 

well thanks to NFSP i now know i have the sh1tty ECU.. so i guess my question now is what do i do? i never plan to boost... do i even need to worry about tuning?
my mods list are as follows

Megan long tubes and full cat back with y-pipe
Kinteix Composite upper plenum /maybe upgrade to the Velocity Mani later
JWT pop charger and Z tube
U/O pulleys and underdrive
JWT clutch and Flywheel

and thats about all ill ever do engine wise as this is my daily, family mover and i need it to be as reliable as possible.

 

so does no body know what options i have or do i just not need to worry about tuning if im never gonna see boost?

 

Well, I think a tune would be VERY useful for your mods, esp. if you have the headers.

Wire it an eManage and get sometime to tune it. I plan to do that after I mess around with my transmission.

PM Tollboothwilley, he did it on his, and he can give you some advice. It shouldn't be too hard, or expensive.

 

i had an e-mange blue on my spec v years ago and was impressed with it, so if i do have that as an option i may go that route again only with the ultimate... thanks for the insight...... anyone else have suggestions?

 

Thats pretty much the only option left for us right now. I plan on doing it this spring/summer when I have the time (and after I find a good tuner in the area).

 

well let me know how that goes for ya,i wish there was more info out there for our cars ECUs but its tough to find

 

Theres more info on this forum, you just have to search.

Search for "doggy door style ecu" and "2003 ecu" and you should find something. There is a discussion on switching the 03 ecu with an 04 which talks about the differences in ECU's, try to find that if you want to learn more.

 

ohhh didnt know it was referred to as a "doggy door ecu" thanks for the info

 

so i did some more researching on my car and everything i have read does not match what i found on my car. By defintion my car should have the Halogen headlights, doggy door trunk, gray plug ECU, and mechanical fan, yet my car has a smooth trunk, black plug ecu, and factory electric fans and HID headlights.

My production date is 03/03 and the last digits of my VIN are 327717 and according to NFSP the ecus didnt change until after 329287, did i just get lucky or is it possible there are other cars like this?

ECU



Fan area



trunk

 

^Unplug your ECU and take a picture of the plug on the ECU itself.
That will tell the story 100%.

 

Too bad Tadashi at Technosquare is not doing tuning anymore...he can tune the 03 ECU's.

 

You're not alone. I have a black connector, HID's (they were an option), and smooth trunk...I do have a mechanical fan though...and still have the old style ECU.

Like NFSP said though, take a pic of the pins and you'll know for sure.

 

HIDs and smooth trunk tell you nothing.

The electric fans though... I wasn't aware of any old ecus with electric fans, but the FSM from Nissan says you have the older ecu.
It would be one of the very very last ones though if it does.

Either way, the pins don't lie.