Ecu tuning 2002/2003 g35sedan (very technical)
#316
08-01-2018, 08:56 AM
#317
12-12-2018, 01:37 AM
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G35 Sedan with APS Twin Turbo Kit
My local dyno tuning shop tried getting my ECU flashed through UpRev, but they couldn't do it for my early 2003 G35 ECU.
#318
12-20-2019, 09:36 AM
The 03' grey connector and early 04' black connector are narrow band primary O2 ECU's. They can be tuned with some freeware crap but I wouldn't spend the time tuning them since they are old school. Convert to a 04.5' up harness and ecu that has wideband targeting and use UpRev for best results. You will have a lot better tune and be happy that you did.
#319
11-08-2021, 02:56 PM
Pulling up the old thread to see if anyone got any answers for this?!?! I read through the whole thing and it seems no one pulled the trigger on swapping the whole engine harness and ecu?!?!
Well I went ahead and stupidly did that to see if it would work.
I have swapped the engine, engine harness, ecu, and transmission from an 04 350z....
Everything seemed to hook up perfectly aside from the oil sensor and 02 which I had swapped as well but aside from that practically flawless fit. (Note trans plugs where different but I swapped the trans so it fits).
Here is the thing:
It turns over but won't start.
Looks to be the security system but when I got someone to try and program the key it wouldn't read the ecu.
One weird thing is that the radiator fans don't shut off unless I remove the battery. (Could this mean even though everything hooks up the wiring is different?)
Would I have to change the cluster?
Also if I was to succeed what features would be missing since the original ecu controls more features other than engine?
Has anyone succeeded with this and just didn't speak up?? If so any help is appreciated.
Well I went ahead and stupidly did that to see if it would work.
I have swapped the engine, engine harness, ecu, and transmission from an 04 350z....
Everything seemed to hook up perfectly aside from the oil sensor and 02 which I had swapped as well but aside from that practically flawless fit. (Note trans plugs where different but I swapped the trans so it fits).
Here is the thing:
It turns over but won't start.
Looks to be the security system but when I got someone to try and program the key it wouldn't read the ecu.
One weird thing is that the radiator fans don't shut off unless I remove the battery. (Could this mean even though everything hooks up the wiring is different?)
Would I have to change the cluster?
Also if I was to succeed what features would be missing since the original ecu controls more features other than engine?
Has anyone succeeded with this and just didn't speak up?? If so any help is appreciated.
#320
03-09-2023, 10:10 AM
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its the premium
would this new haltech work on my g35 sedan 6mt?
#321
03-10-2023, 12:28 PM
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Yeah but what do you need a standalone for? Unless you need it for boost applications where you need extra safeties like boost cut and whatnot then you're better off with an Uprev tune. Not to mention it's only about 1/4 the cost and you get to keep all your other car stuff intact with no dash lights.
#322
03-10-2023, 12:34 PM
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Yeah but what do you need a standalone for? Unless you need it for boost applications where you need extra safeties like boost cut and whatnot then you're better off with an Uprev tune. Not to mention it's only about 1/4 the cost and you get to keep all your other car stuff intact with no dash lights.
#323
03-10-2023, 01:23 PM
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Ahh, check out which ECM you have in this thread (it's the one in the middle with the black housing). Make sure it's harness/plug is the same in the Haltech video.
https://g35driver.com/forums/g35-cou...ml#post7170856
https://g35driver.com/forums/g35-cou...ml#post7170856
#324
03-10-2023, 01:34 PM
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#325
03-10-2023, 09:15 PM
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#327
06-03-2023, 04:40 PM
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i have the older model ecu that uprev doesn't support
#328
06-03-2023, 04:47 PM
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Yes, you can repin the chassis harness to the newer harness style and use a newer ECM, you will need to have it programmed and paired to the BCM and NATS as well before the car will start.
This option is a lot more viable now that there are plenty of donor cars sitting in wrecking yards.
FSM has the ECM pinout, section EC - Engine Controls
This option is a lot more viable now that there are plenty of donor cars sitting in wrecking yards.
FSM has the ECM pinout, section EC - Engine Controls
#329
06-03-2023, 05:11 PM
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#330
06-04-2023, 10:06 AM
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