After a Break, Jumping back in, 92 VX Head Swap D15Z1

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Spyderturbo

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Hey what's up guys, been a while since I've been on here but sadly, it's been a while since I've had a reason to be. My last swap project was my long gone 94 CX into which I put a D16Z6. Anyway, now I am about to get a 92 Civic VX Hatch! I'm psyched. I'm gonna pass on doing a B series but I really want to do a head swap. Ive read that the D15Z1 bottom end responds well to a Z6 Vtec head, giving a motor that spins nicely to 8K and throws out about 130HP at the crank I imagine. Has anyone done this swap? I know the 5 wire to 4 wire Oxygen sensor will be needed if I run a P28 but I might use the VX ECU at first. Just wondered if anyone else has done this swap. I did a search but didn't see much....
 
Get a P28 ECU. They're not too expensive. The VX ECU will be mapped really funny (but it will read the wideband O2)- but if you can chip it with Uberdata or something, it might actually be better (tuned) than swapping straight to a P28.

StealthMicro- you have completely the WRONG ECU for a Z6. The PR4 is a non-OBD ECU without VTEC control.
 
Calesta, thanks for the input, I was planning on the P28, I know I just need to run the O2 wires then, I was more curious about clearances and comp ratio's, I've heard that putting a Z6 head on a D15Z1 results in lower comp due to the dished pistons in the D15Z1 block and the larger combustion chambers in the Z6 head vs. the stock Z1 head. I think some people use PMS? pistons when they do this swap, I know the D15Z1 bottom end is supposed to be very good compared to the other D series bottom ends. Just wondered if anyone has tried this combo and if so what the reults were....
 
Calesta said:
Get a P28 ECU. They're not too expensive. The VX ECU will be mapped really funny (but it will read the wideband O2)- but if you can chip it with Uberdata or something, it might actually be better (tuned) than swapping straight to a P28.

StealthMicro- you have completely the WRONG ECU for a Z6. The PR4 is a non-OBD ECU without VTEC control.
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:lol: ya beat me to it. Hey stealth go get a p28. And ditch the LS ecu.
 
Spyderturbo said:
Calesta, thanks for the input, I was planning on the P28, I know I just need to run the O2 wires then, I was more curious about clearances and comp ratio's, I've heard that putting a Z6 head on a D15Z1 results in lower comp due to the dished pistons in the D15Z1 block and the larger combustion chambers in the Z6 head vs. the stock Z1 head. I think some people use PMS? pistons when they do this swap, I know the D15Z1 bottom end is supposed to be very good compared to the other D series bottom ends. Just wondered if anyone has tried this combo and if so what the reults were....
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D-Series Engine Building Notes

I've never tried it, but there's a link that might be able to help you out. The Z1 pistons are very deeply dished. If you want to try something crazy, you could try to drop in another set of pistons and still use your Z1 head, then have a cam custom ground for more performance on the Z1 too.
 
Try just swapping your cam and ecu. Im running the d15z1 in my 95 vx hatch. I got a cam from my buddy's D16z6 and swapped in the P28, that swapped me to reg. VTEC. As for pistons Im running the dome tops out of a ZC. Im also using a after market intake mani with a b-series TB and the injectors out of the Z6. I think all together I got about 70 bucks invested and about half a day of work. Makes a big difference.
 
You have a red dot because you have no rep yet. People give you rep points if they feel like you deserve it. Read the FAQ about it- I'm not even sure exactly how it works.

Admins aren't here to be technical resources- we're here to run the board.

As far as the D15Z1, it came from the 92-95 Civic VX hatchback.
 
That is the vtec-e which is mainly for fuel economy and not performance. All it does is shut down two vavles in low RPM.
 
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1988hondacrxsiR1 said:
z1 from what car year and code of car duh? admin w/ a big stick and why i have a red dot for my reputation i dunno what is the deal please help? thanks ;)
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I think you have -negative rep.. I am new around here aswell but I have watched you post whore double posting every 3rd one pretending it was an accident. Also some advice you have given was false and you have posted almost non sense on some threads.

Ic3
-EDIT- Well it appears you are banned so looks like I am post whoring now ;)
 
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