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Curious George
'99 LX Civic Sedan
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Discussion Starter #1 (Edited)
I got Z6 head and '99 obd2b p2p ECU. I will run (if it's possible) this setup with:

- y8 IM/TB/IACV/injectors
- '99 y7 harness
- I have only from Z6 head & Vtec selenoid (cam,cam gear, rocker arm every mecanic I need).

I know how to hook up vtec selenoid and new 2 wires IACV conversion, BUT
I see many y8 head with z6 ecu, but not yet z6 head with y8 ecu.

For Knock sensor, vtec pressure switch; Z6 head doesn't have vtec pressure switch... For the fuel pressure tank sensor ? Does my '99 LX have one ? Does it have something else that I should know about sensor and wiring with those ecu/harness and head ?

Do I will fuck with everything mentionned ? or let it like that ? Or I must bypass it ? Or install new coponents ?

I can't see clearly with wiring and What I should do ... please help me

thank you
 

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D-Series Post Be-itch... gimme gimme gimme
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pressure switch, I would research into what voltage it needs (prolly 12V) and go ahead and wire it up as if the curcuit was completed... although the reason that they put them on the new blocks is because the d16y* blocks don't have the same amount of oil pressure that the d16z* motors had... but you should be fine..
 

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I run a p2p in my 99 dx with a full y8. As far as i know, there is no easy fix for the tank pressure sensor. There was some kind of Katman write-up a while back but I don't have the link. I think you can probably short the oil pressure switch wires together to complete the circuit for the sensor. If you don't find a way to fix that, you will have no vtec.
 

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Curious George
'99 LX Civic Sedan
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3,569 Posts
Discussion Starter #5
I'm not swapping obd1 to obd2 !!! My '99 car is already obd2b, I just swap Y7 ecu for Y8 obd2b ecu. Some things to fix, but I bought a complete z6 head for really cheap...

I just realized that p2p has vtec pressure sensor, and z6 head don't... :( I need to fix it if I don'T want to make obd1 conversion and stay with my y8 stock, or swap z6 head for y8... both needs $$$ $$$....

But if the p2p ecu is the same year as my y7 P2e, so does my car have tank pressure sensor ?

I'll try to find what is the sensor voltage when pressure is ok ! and make like ONECAMWONDER said, complete the circuit for the sensor...

Thank you !!
 

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Curious George
'99 LX Civic Sedan
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3,569 Posts
Discussion Starter #6
I read somewhere in this web site:

''Ground out the pin on the ECU to disable... when the oil pressure is sufficient, the pressure switch shorts to ground.''

Not so bad :) :)
 

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Curious George
'99 LX Civic Sedan
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3,569 Posts
Discussion Starter #8
Why ?

it almost the same thing ??? port on z6 are taller, and work like y8 work... I just want to keep y8 ecu and fix some small sensor and wiring troubles...
 

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Y7/Y8 heads are COMPLETELY different from Z6 heads. Y7/Y8's use an entirely different ignition map. Its DRAMATICALLY different. With a P2P ECU on a Z6 head you will be running like 18* at WOT when a normal P28 ECU runs something like 26*. It will idle like garbage because P2P ECU will want to idle at 12*....Its a whole big thing. Do what you want, but i bet when this project is finished you will post saying "Why is my car driving like shit?"
 

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Curious George
'99 LX Civic Sedan
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3,569 Posts
Discussion Starter #10
bigwig said:
Y7/Y8 heads are COMPLETELY different from Z6 heads. Y7/Y8's use an entirely different ignition map. Its DRAMATICALLY different. With a P2P ECU on a Z6 head you will be running like 18* at WOT when a normal P28 ECU runs something like 26*. It will idle like garbage because P2P ECU will want to idle at 12*....Its a whole big thing. Do what you want, but i bet when this project is finished you will post saying "Why is my car driving like shit?"
Y8 head with p2p ecu will run like shit too ?!? Port and combustion chamber are little bit differents, but tell my why p2p will idle like shit at 12 and and wot @ 18 and run like shit while every obd2b EX or canadian SI running with it ? My y7 have this kind of ignition basemap, and combustion chambers are the SAME as z6, 34cc CB and same shape and my car run well.

You can adjust timing manually with dizzy and jumping plugs to read cel.
 

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I'll try to explain this one more time....

D16y8 uses a P2P ECU. The D16y8 head is dramatically different than most other honda heads. It has a different shaped combustion chamber. This means the ignition timing for the D16y8 is dramatically different than other honda engines. D16y8's idle at 12*BTDC and at WOT they are only running like 17* timing.

A D16z6 uses a P28 ECU. The D16z6 head is very similiar to most other heads honda produced so its ignition curve is very similiar. At idle a D16z6 runs 16* BTDC and at WOT about 27*.

If you use a D16z6 head with a P2P ECU you will be running the ignition timing for a D16y8 head on a D16z6 head. This means an engine that would normally want to have about 27* of timing at WOT will now have about 17* of timing. It will cause the car to run poorly and not well.

The solution: Use a P28 ECU with your engine setup or use a D16y8 head.

I cannot be ANY clearer. If you dont understand what I'm saying, then dont do the modification.
 

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Curious George
'99 LX Civic Sedan
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3,569 Posts
Discussion Starter #12
I understand what you said ! But if compression ratio is higher, means timing is not agressive, maybe it's should be good if I raise compression ratio near 10:1/10.5:1 with this ecu without knocking..... I'll try it with higher CR or I'll replace it if runs really bad... for y8 head or p28 conversion (would be cheaper to get y8 head here)

But one thing I said that you don't mind, Stock p2p ecu want to run 12 at idle and 17 wot, but You CAN advance timing manually (with dizzy and jumping blue 2 wires plug near ECU). Ecu will think 12 and 17 but if you set it @ 16 and wot should be near 22-23 maybe more .... Not so bad....

Someone else agreed with BigWig or have everseen p2p and p28 stock ignition map ??

thank you
 

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D-Series Post Be-itch... gimme gimme gimme
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But I don't think that you can advance it that far... and plus, the entire RPM range the curve is differant..... not just wide open, but part throttle, too.

Also, I *THINK* that the dizzy has a sensor that tells the ecu what the timing is set at...
 

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Curious George
'99 LX Civic Sedan
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3,569 Posts
Discussion Starter #14
Maybe ! but I read many time if you advance only dizzy, ecu will try ti set back to stock basemap, you need to jump diag blue plug near ecu while engine is warm and you advance dizzy there, to 'tweak' the ecu that is 12 degrees start (when it's 16) and advance 6-7 degrees in some point and wot...
 

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Swapping heads between 5th and 6th gen is just a bad idea. Find a Y8 head, you will be much happier.
 

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No, D16y8 and D16y7's timing at idle is 12 BTDC. Refer to your helms manual.

As for manually advancing the timing, I'm going to bet the ECU will constantly try to correct the timing and cause all sorts of havoc.

You're Z6 head is worth more than a Y8 head. You should be able to sell the Z6 head for a few hundred bucks and pick up a Y8 head without pulling a dollar out of your own pocket. Just get a Y8 head. That or convert to OBD1. If you continue with the swap as is, I think you are going to run into issues. Do what you want, but you've been thoroughly warned.
 

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Curious George
'99 LX Civic Sedan
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Discussion Starter #18
yeah !!! thank you !! I'll try to find y8 head... Or I'll wait until I'll find p28 ecu, because I got no cat and p28 run one o2 sensor... it will be easier too for that point..
 

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Curious George
'99 LX Civic Sedan
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3,569 Posts
Discussion Starter #19
But One thing I want to know, how these too head make around the same power and tq ???? and one of them has ignition about 10degrees more advance than the other ??

thank you
 

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D-Series Post Be-itch... gimme gimme gimme
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Because of the differance in head design... just like the 01-05 EX's.... they have VTEC-e, but still have 127 HP. The z6 head has a tumble port valve design, meaning that the air goes straight in and is built more for high rpm. The y8 head has a swirl port head design that promotes fuel economy and more low end torque. The z6 needed that much timing in order to get the same torque.
 
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