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Obd-ii -> Obd-i

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Old Oct 23, 2002 | 11:31 AM
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Obd-ii -> Obd-i

are there any write ups for this anywhere, cuz i know ive seen it for hondas and such. Has anyone ever attempted this? I know its been done by JWT for a 2k Maxima.
Old Oct 23, 2002 | 12:51 PM
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Re: Obd-ii -> Obd-i

Originally posted by SkylineGTR
are there any write ups for this anywhere, cuz i know ive seen it for hondas and such. Has anyone ever attempted this? I know its been done by JWT for a 2k Maxima.
Can you point to where JWT did this for a 2K Max?

I believe all they did was HACK a '95 OBD-I ECU into a 2K Max, but I'd like to know more.
Old Oct 23, 2002 | 07:25 PM
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yea thats what i meant .. they used the 95 ECU for the 2k, but thats in essence doing the same thing. Lot of Honda/Acura guys convert from OBDII to OBDI so they can use aftermarket ECUs. I'm thinking, use a aftermarket ECU for a 95, set up the VIAS to a RPM switch instead of ECU reading, and a couple other mods here and there and i was thinking that it could be done. Ive seen diagrams for some Hondas, so is it that it just hasnt been tried, or is it just too difficult to look at?
Old Oct 23, 2002 | 09:15 PM
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Hmmmmmn....

Originally posted by SkylineGTR
yea thats what i meant .. they used the 95 ECU for the 2k, but thats in essence doing the same thing. Lot of Honda/Acura guys convert from OBDII to OBDI so they can use aftermarket ECUs. I'm thinking, use a aftermarket ECU for a 95, set up the VIAS to a RPM switch instead of ECU reading, and a couple other mods here and there and i was thinking that it could be done. Ive seen diagrams for some Hondas, so is it that it just hasnt been tried, or is it just too difficult to look at?
I don't think HACKing a JWT 95 ECU into a 5th gen. would be too difficult as long as you have a FSM, but if I went through all that trouble I'd probably go with a standalone for the ability of the user to customize. However, there are too many unknowns as to what the stock ECU does and does NOT control for me to ever consider either.

I believe the real reason nobody has tried this is that the FMU, FP regulator, and magic black-box(S-AFC) bandaids seem to work extremely well, therefore there is no need to pioneer the ECU R&D. I'm definitely NOT saying there wouldn't be advantages though.

Until there are no more quick and easy fixes for fuel delivery under N20 or boost, I doubt there would be enough demand to ever make an aftermarket ECU a reality for the VQ30 DE/DE-K.

One possibility is that the VQ35 guys may get something due to the 350Zs popularity and maybe, just maybe, we could hack one of those ECUs plus run their bigger injectors. There are quite a few hurdles with that idea such as throttle by wire, returnless fuel system, ECU differences, and more we don't have a clue about, so it may be impossible, but I hope not.
Old Oct 23, 2002 | 10:19 PM
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yea, but i guess its nice to dream, hehe, just that i think we 5th gen owners would benefit quite a bit from a higher redline.
Old Oct 23, 2002 | 11:15 PM
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i dunno bout you guys but my 95 Max is OBDII. production date 4/95
i belive most if not all 95's are OBDII
Old Oct 23, 2002 | 11:16 PM
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all '95s have OBDII computers I dont think any model in the US was sold with OBDI as a '95 model
Old Oct 24, 2002 | 12:25 AM
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Originally posted by carnal_c30
all '95s have OBDII computers I dont think any model in the US was sold with OBDI as a '95 model
not that i don't believe you, but why then have there been people on here claiming how 95's are a tad bit faster due to obd I. not to mention, that's "supposedly" why jwt first only had ecu's for 95 only, or so was told at least. i thought that most maxima's might've been obd II like you said, but i always wondered from all the debate and hearsay...
Old Oct 24, 2002 | 12:28 AM
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all im saying is MY 95 Max production date 4/95 is OBDII. i know that for a fact and am willing to bet my turbo setup that it is. i do belive 99% that all 95's are OBDII. Simple fact like i have a 95 service manual and all it covers is OBDII info. id be willing to put money day saying all 95's are OBDII
Old Oct 24, 2002 | 11:08 AM
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Originally posted by Turbo95Max
all im saying is MY 95 Max production date 4/95 is OBDII. i know that for a fact and am willing to bet my turbo setup that it is. i do belive 99% that all 95's are OBDII. Simple fact like i have a 95 service manual and all it covers is OBDII info. id be willing to put money day saying all 95's are OBDII

I believe ya!
http://www.obdii.com/connector.html
Old Oct 24, 2002 | 11:27 AM
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This might sound stupid for asking... but like other people on the board i thought that the '95 where OBDI. If they are OBDII then why wont the aftermarket ecu's work then or just be programmed differently for the changes in a newer max. Seems like it wouldnt be that difficult to work.

the whole reason that i thought that they absolutely would not work was because of the OBDI and OBDII difference.
Old Oct 24, 2002 | 11:33 AM
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Originally posted by deadrx7conv



I believe ya!
http://www.obdii.com/connector.html
check it again, it says its not fully compliant.
Old Oct 24, 2002 | 11:42 AM
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Originally posted by Turbo95Max
all im saying is MY 95 Max production date 4/95 is OBDII. i know that for a fact and am willing to bet my turbo setup that it is. i do belive 99% that all 95's are OBDII. Simple fact like i have a 95 service manual and all it covers is OBDII info. id be willing to put money day saying all 95's are OBDII
Well it looks like your right. I just took the 4th gen. forum hersay and believed it. However, with a little searching the debate has gone around a few times and it appears to look like 95s with a post feb/march production date are OBD-II. I don't see what all the fuss about swapping 95 ECUs into 96/97s with CEL was all about.

Something else must be going on here. I believe the 95-96 Consult was changed for 97+ according to Techtom for the MDM-100, but that could be BS also.

Anyways, the point was that JWT reprogrammed ECUs are only available for the 95-96 and whether it would be feasible to HACK it to work on a 5th gen..
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