Hey guys, recently a guy pulled an ECU off a J30 and put it in his NA z32 Auto and he is claiming very good performance gains. Claims that VTC is lowered to 2,900 rpm, redline raised to 7,500 rpm along with moderate power increase and running very smoothly, only complaint is that it is running VERY rich, fire balls out the exhaust.
So I was wondering, if any of you have experience, what are stock parameters for the ECU and what are your aftermarket ones (VTC, redline, etc.) . Since we have the same engines I am finding it hard to believe all these things are true, along with the performance gains.
J30 ECU = more performance in a Z32?
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yodawill2000
- Posts: 3888
- Joined: Thu Mar 24, 2005 4:10 pm
- Car: 94 Infiniti J30
- Location: Grand Prairie TEXAS
Re: J30 ECU = more performance in a Z32?
Wow !
I thought it would be the other way around..
One of the Guru's should chime in soon.
I thought it would be the other way around..
One of the Guru's should chime in soon.
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swimshark
- Posts: 593
- Joined: Fri Feb 23, 2007 8:17 am
- Car: Bamboo Mist 1994 Infiniti J30 Soon to RIPs
Pearl White 1993 Infiniti J30 Project Ghost
Re: J30 ECU = more performance in a Z32?
I might be one of the few that will actually chime in since I have messed with the ECU trying to see if i could use a 300zx ecu and it actually was a downgrade. my J30 is a 5spd but tried different ecus while at Z1 and the only one that worked was a chipped 91 ecu that i had custom done. using old style and new style 300zx ecu (manual/auto) would make my car freak out. under WOT/cruising, after 45mph the car would die while in motion. i think it also dynoed about 10 less hp but the graphs arent marked under my file at Z1.
my J30 isnt running right now but i can probably do some testing one weekend at Z1 with some dyno graphs for clarification once i get it back on the road.
my J30 isnt running right now but i can probably do some testing one weekend at Z1 with some dyno graphs for clarification once i get it back on the road.
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swimshark
- Posts: 593
- Joined: Fri Feb 23, 2007 8:17 am
- Car: Bamboo Mist 1994 Infiniti J30 Soon to RIPs
Pearl White 1993 Infiniti J30 Project Ghost
Re: J30 ECU = more performance in a Z32?
also here are the fuel maps i pulled off each ecu way back in the day when i had my obd1 port connected to my laptop. this was done using ZTalk
J30
300zx
i would post more on the 300zx club FB group but not much love for someone who has done more research on my J30 to get it where its at than most people on there look in to their own Z. doesnt look like much from outside but its taken a lot of different parts from different nissans to get it where it is at.
J30
300zx
i would post more on the 300zx club FB group but not much love for someone who has done more research on my J30 to get it where its at than most people on there look in to their own Z. doesnt look like much from outside but its taken a lot of different parts from different nissans to get it where it is at.
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DankZX
- Posts: 372
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- Car: 1991 N/A 300ZX: Few Mods
1996 Sentra GXE - Location: Centerville, IA
Re: J30 ECU = more performance in a Z32?
Swimshark, could you explain the coloring and the numbers so can understand this better.
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swimshark
- Posts: 593
- Joined: Fri Feb 23, 2007 8:17 am
- Car: Bamboo Mist 1994 Infiniti J30 Soon to RIPs
Pearl White 1993 Infiniti J30 Project Ghost
Re: J30 ECU = more performance in a Z32?
i would actually need to ask Ash or John about the numbering. im not savvy on tuning and reading the OEM fuel maps.
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adroitcaptor
- Posts: 3
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- Car: 08Skyline
97Max
85Tzx
83ZX
78Z
Re: J30 ECU = more performance in a Z32?
You have got to be kidding me! I wrote this long response and it all got deleted because I was not logged in... epic failure. This one will have to be much shorter so please forgive my brevity.
Regarding the mapping:
The numbers across the top are throttle position/'load'.
The numbers down he left side note the RPM.
The numbers in the middle represent AFR at the correlating RPM and TP.
The colors are to help easily identify your AFR representation. (Most have more colors; some can even be shown in a 3D model that depicts duty cycle or many other parameters.)
Regarding the ECU changing mapping:
Fist, how it works on a very basic level. - The ECU sends a specific voltage to MAF. The MAF 'uses' this voltage to heat an element. When that voltage must increase to maintain the same temperature the ECM knows more air is flowing through the MAF. (Not all units work in this way but as a generality, in this applications, and for purposes of explanation...) The voltage that 'get sent back' to the ECM will tell it how much air is going into the engine. The ECM then compounds this data, along with many other inputs (temp, throttle position, etc.), to controls the duty cycle of the injectors. There is a lot more at play including RRFPRs and the like, but on a basic level, I hope the above serves to clarify/help.
So why would this affect the car running when the engines are so closely the same? - There are a few aforementioned variables here to look at. The MAF and ECU being the biggest two. The MAF can vary in operation but also in its voltage range. Most will increase linearly with RPM but an ECU looking for a specific voltage and seeing another can change the whole map. The ECU can supply a different voltage, read different voltages from sensors, or give the wrong 'type' of signal to the injectors.
Your problem - The J30 and the Z32 have the same MAF. They also have very similar engines and ECUs. One specific place they do differ is the ECM set voltage for the MAF supply. The J30 sends a 0.8VDC primary signal where the Z32 a 1.0VDC. This could account for the fundamental change in AFR. However, I would have to do a lot more research into the ECUs to know all the differences.
I hope this helps answer your questions. I am no expert and own neither of the aforementioned vehicles (though I hope to buy a J30 today).
dan
Regarding the mapping:
The numbers across the top are throttle position/'load'.
The numbers down he left side note the RPM.
The numbers in the middle represent AFR at the correlating RPM and TP.
The colors are to help easily identify your AFR representation. (Most have more colors; some can even be shown in a 3D model that depicts duty cycle or many other parameters.)
Regarding the ECU changing mapping:
Fist, how it works on a very basic level. - The ECU sends a specific voltage to MAF. The MAF 'uses' this voltage to heat an element. When that voltage must increase to maintain the same temperature the ECM knows more air is flowing through the MAF. (Not all units work in this way but as a generality, in this applications, and for purposes of explanation...) The voltage that 'get sent back' to the ECM will tell it how much air is going into the engine. The ECM then compounds this data, along with many other inputs (temp, throttle position, etc.), to controls the duty cycle of the injectors. There is a lot more at play including RRFPRs and the like, but on a basic level, I hope the above serves to clarify/help.
So why would this affect the car running when the engines are so closely the same? - There are a few aforementioned variables here to look at. The MAF and ECU being the biggest two. The MAF can vary in operation but also in its voltage range. Most will increase linearly with RPM but an ECU looking for a specific voltage and seeing another can change the whole map. The ECU can supply a different voltage, read different voltages from sensors, or give the wrong 'type' of signal to the injectors.
Your problem - The J30 and the Z32 have the same MAF. They also have very similar engines and ECUs. One specific place they do differ is the ECM set voltage for the MAF supply. The J30 sends a 0.8VDC primary signal where the Z32 a 1.0VDC. This could account for the fundamental change in AFR. However, I would have to do a lot more research into the ECUs to know all the differences.
I hope this helps answer your questions. I am no expert and own neither of the aforementioned vehicles (though I hope to buy a J30 today).
dan