G35 Sedan V35 2003-06 Discussion about the 1st Generation V35 G35 Sedan

Early 03 to 04 ecm, trans, etc swap.

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Old Apr 7, 2024 | 12:02 AM
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AyoItsSteve's Avatar
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03 G35 Sedan base model
Early 03 to 04 ecm, trans, etc swap.

Yooo, been a bit. Life happened lol, now im back with more stupid ideas that will prolly be WAY too much work for what its worth but im hard headed and yeahhh. So lets start off with some simple stuff, new engine in the G, but i still have alot i wanna do to make this into my vision. The early model 03s have alot of downfalls so my idea is to fix those and improve the car in the process as well. I want to swap the 03 to 04 ecm and harness, auto to manual swap, because i know the tcm differences between the years causes an issue, open to lsd differential swap (autos come with an open diff but swapping to the manual lsd causes your speedo to wack out apparently) can anyone *cough cough, cleric* help me out with a list, so far i have
harness
ecm
manual trans + "swap kit (clutch lines, pedal etc)
LSD
dual electric fans
ipdm
what else would i need, what are the specs for the trans, i.e what years work and what trans code (cd009, 008?) should the ipdm and harness and ecm just be plug n play? So on and so forth, any additional advice is fully welcome. TIA.
(yes i know im better off getting a seperate G but life says otherwise)
 
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Old Apr 8, 2024 | 10:59 AM
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We can tune it for the 6MT swap with Uprev if you want to keep the 5AT ECU. If you do swap ECU's we'll need to flash it with Uprev to bypass NATS (immobilizer). But you'll want a tune anyways with all that fun going on.

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Old Apr 8, 2024 | 11:30 AM
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03 G35 Sedan base model
Originally Posted by seymore4
We can tune it for the 6MT swap with Uprev if you want to keep the 5AT ECU. If you do swap ECU's we'll need to flash it with Uprev to bypass NATS (immobilizer). But you'll want a tune anyways with all that fun going on.

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shot ya a pm for your email
 
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Old Jun 29, 2025 | 03:14 PM
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03 auto ecu to 04 auto ecu

Originally Posted by seymore4
We can tune it for the 6MT swap with Uprev if you want to keep the 5AT ECU. If you do swap ECU's we'll need to flash it with Uprev to bypass NATS (immobilizer). But you'll want a tune anyways with all that fun going on.

Email me anytime
How would this would if i was just trying to swap 03 auto ecu to 04 auto ecu to get tuned?
 
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Old Jun 29, 2025 | 07:18 PM
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Originally Posted by Shitty.G35
How would this would if i was just trying to swap 03 auto ecu to 04 auto ecu to get tuned?
You have the early 03 ECU that we can't tune? Email me. seymore4 at gmail
 
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Old Jun 30, 2025 | 05:42 PM
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'Doggydoor' WIP Nismo G35 Sedan
Got an early 03 ecu myself. I've read that it's only flashable with one map, ie. no custom maps via cruise control. The alternative is to use a piggyback system, which you'd have to wire up a custom adapter for (This is what I'm about to do with my unichip). Do you have any further insight about these early ecus and their tuning capabilities? Or do I gotta email you too for this secret briefing?
 
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Old Jun 30, 2025 | 07:31 PM
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Originally Posted by AliveAgain
Do you have any further insight about these early ecus and their tuning capabilities?
Can't tune them with Uprev
 
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Old Jul 24, 2025 | 05:53 PM
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06 Manual swapped G35
Where can I get the uprev tune?

Currently trying to find where I can get one, I have a 06 auto and I the the pure tube for my ecu, or would it be simple to find an 06 mt ecu need it for nats delete my car currently cranks but no start with solid red light
 
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Old Jul 24, 2025 | 06:19 PM
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06 Manual swapped G35
Originally Posted by GBaby96
Currently trying to find where I can get one, I have a 06 auto and I the the pure tube for my ecu, or would it be simple to find an 06 mt ecu, need it for nats delete my car currently cranks but no start with solid red light

sorry meant to say “ I have 06 auto and I need the pure tune


currently I have the 6mt swap done and I drove it for couple weeks but then my car sat for about a month and now it cranks but no start
 
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Old Jul 24, 2025 | 06:41 PM
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Email me I can help you out. seymore4 at gmail
 
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