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Old 09-16-2009, 05:29 PM   #1 (permalink)
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VX swap questions

I have a 1974 Honda Civic which I made AWD by transplanting it onto a shortened 1989 Civic RT4WD floorpan/firewall (OBD-0 chassis). I've driven it over 100K miles since the transplant, with two different engines. Right now it is running a 1994 OBD-1 d15b from a JDM civic. I only get 30 mpg, which is a disappointment. I used to get 31-32 with the original non-vtec d16a6.

I picked up a cheap VX (d15z1?) motor from a guy who swapped it out for more power. What is needed to get the VX up and running in stock form? I've already got an OBD-1 jumper harness, I'm running an OBD-1 P28 ECU now. I've got the 4 wire O2 sensor. I've heard there is some component that needs to go on the firewall, or something, that is specific to the VX. I don't yet have an ECU.
Brian


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Old 09-16-2009, 07:28 PM   #2 (permalink)
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A p28 and 4-wire isn't going to work for the car, unless you're planning to run california emissions, in which case you'll probably still need a cali vx ecu since I don't think anyone has dumped the rom for the cali vx yet. I would pick up a p07 and ntk/ngk 5wire or the swap really won't be worth it. You'll also need the additional wiring for the vx and the EGR controls.
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Old 09-18-2009, 04:34 PM   #3 (permalink)
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Quote:
Originally Posted by SVOboy View Post
A p28 and 4-wire isn't going to work for the car, unless you're planning to run california emissions, in which case you'll probably still need a cali vx ecu since I don't think anyone has dumped the rom for the cali vx yet. I would pick up a p07 and ntk/ngk 5wire or the swap really won't be worth it. You'll also need the additional wiring for the vx and the EGR controls.
I meant that I have a 5 wire, not 4. My mistake. What extra wiring? Are you sure the VX has an EGR? Is the P07 the stock ECU? Is there a difference in the long block for a CA VX vs. 49 state VX? Or is it all external?
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Old 09-18-2009, 05:25 PM   #4 (permalink)
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Extra wiring would be vtec, egr, 5 wire o2, I'm not sure if there's any besides that if you are already running mpfi.

I'm sure it has egr, I can show you a picture of the egr valve on my engine if you want me to.

P07 is the stock ECU

The differences are just the o2 and computer.
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Old 09-18-2009, 05:44 PM   #5 (permalink)
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I'm already running OBD-1 vtec so I think it is just the 5 wire and the EGR, right?
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Old 09-18-2009, 05:45 PM   #6 (permalink)
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Old 09-18-2009, 06:52 PM   #7 (permalink)
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Quote:
Originally Posted by Carwhisperer View Post
I'm already running OBD-1 vtec so I think it is just the 5 wire and the EGR, right?
Probably, yes. I forget from when I did the swap but that seems about right

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