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Discussion Starter #1
I am thinking of Purchasing another Spec V i am getting a good deal on the one i am looking at. but my concern is that the guy Put a 06 Spec v Ecu in The 04. His Reason for doing so is " That it allows for a Higher redline". The car seems to run Fine but obviously has a check engine light For the A/F Sensor. But What are the Pros and Cons to Swapping the ECU from an 06 on the 04?
 

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04-06 ECU's are able to be reflashed with UpRev tuning software. 06 ECU uses a factory wideband A/F sensor as the primary oxygen sensor. 04-05 use a standard narrowband four wire oxygen sensor. 06 ECU is best for tuning.
 

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Discussion Starter #3
So I don’t know if any tuning has been done to the 06 Ecu so if it is a Stock 06 ecu in the 04 what are the biggest issue I am going to have to deal with?
 

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I think wiring to the wideband will have to be done. Not sure if anything else is really different. Not sure how the 04 vs 06 is different as far as Uprev.
 

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Discussion Starter #5
I will have to get some more info from him because the car seems to run fine. And when I put on my scanner I only had the O2 sensor codes( because he has Headers and straight pipe on it now) and a code for the A/F sensor
 

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You would have to run a wire from the ECU to the A/F sensor and, I believe, change the connector on the engine harness to get rid of the A/F code. Or replace the engine harness with that of an 06. The cat code can be cleared with anti-foulers to space out the secondary oxygen sensor.
 

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What code exactly?
 

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Discussion Starter #9
Would it be Better to just buy a 2004 Ecu from the dealer and just put that in and then do the anti-foulest spacers for O2 sensors?
 

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Discussion Starter #11
Well I have been a tech for the last 10+ years and i have rewired and pinned numerous vehicles. Have always been alot more familiar with hondas... I know SMH... but never really dived in on my sentra but that was about 14 years ago when i owned that.So is there a link to a how to page or anywhere i can get the info on what i need to do on this Forum?
 

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Take the ecu out. If it’s an r4 it’s a non nats (immobilizer) ecu, if it’s an r5 then it’s nats. Anyway, you can just buy an ecu from a part out or junkyard to match your car. An 04 would be either a p7 (non nats) or a p8 (nats). You could swap an 05 GT or GU respectively as well with no issues or rewire.

To wire in the af sensor there are 4 extra wires and you have to splice into 1 of them on the ecu side, then you need to splice 1 at the connector of the old o2 for the o2 heater power supply. You can download the fsm from www.nicoclub.com/fsm for either years and just look under ec.pdf for the wiring diagram.

The only advantage of the 06 over the others is the af sensor. Tuning is a lot easier. If you’re going to keep it stock and just add bolt ons, you can get away with just using the 04/05 ecus. Good luck.
 

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Well I have been a tech for the last 10+ years and i have rewired and pinned numerous vehicles. Have always been alot more familiar with hondas... I know SMH... but never really dived in on my sentra but that was about 14 years ago when i owned that.So is there a link to a how to page or anywhere i can get the info on what i need to do on this Forum?
Check here for FSM How To Use NICOclub Factory Service Manuals
 

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I would advise against another spec v altogether. Parts are discontinued, scarce, and can be expensive. For an example, i had to replace my trunk key cylinder, after an attempted theft. Nissan had all but 15 of these left im stock nationwide. Plus i needed the trunk latch wire, not even available anymore. Out the door it was $600. And only nissan could do it. Plus smogging will be more difficult, these cars are reaching 20 years old.
 

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Discussion Starter #15
Thank Everyone for the info I ended up Getting a P7 Ecu and put that in, did all the Relearns and car is running good with No CEL and Pass the Smog emission test without any issues! So now I have an R4 Ecu for sell.
 
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