So I'm kind of jumping around to all different places to gather as much info as i can to build up this mini me swap I'm performing on my 90 crx si. Original D16A6 block paired with a D16Z6 head i picked up. So I understand in order to use the vtec I either need to A: Get the p28 ecu and use the rywire harness adapter to use vtec in as almost as factory use as possible or B: I can chip the p08 factory ecu in the car still use my factory A6 dizzy and wire the vtec to a controller? I have the Z6 dizzy, intake manifold, and throttle body I can use for the swap. Which regardless I'm using the manifold and throttle body. So my question is which would be the better route to go if my 2nd option is even feasible? Are there any things that would make one over the other easier/better. If you need more info or anything just ask and I will see if I can gather what I need to tell you so you could help me out. Thanks in advance!

 

Both ECUs support vtec.
There is no need for an external controller for vtec on the P08.

Both are also OBD1.
Either route, you are going to have to buy a jumper harness to plug the ECU in under your dash (as well as a 4 wire O2 sensor).

Being OBD1 ECUs, you can NOT use the OBD0 D16A6 distributor as it will send the wrong signals to the ECU.
You probably wouldn't want to anyway since it won't bolt up to the head without modification.

P28 is a better ECU if you do not plan to chip it. It is already mapped for a 1.6l motor while the P08 is mapped for a 1.5l.

If you go chipped, either ECU will map the same.
The difference, I think, is that the P08 won't have ELD support since it is a JDM ECU.

 

Ok thanks for the quick reply. But!!! lol im an idiot. I meant PM6 not P08. Can the PM6 be chipped to work with the setup or is it impossible being OBD0.

 

PM6 can work.
If you don't have A/C, then it can be chipped to output vtec control on the A/C wire.
If you can get hold of the PS9, ECU for D16A6 with automatic transmission, then you can keep the A/C (if you have it) and output vtec on the lock-up solenoid wire for the automatic.

You will need to modify your distributor to bolt up to the Z6 head.

Try contacting Xenocron for your ECU conversion/chipping.

 

Sounds good. Should the intake manifolds pretty much be plug and play installing the Z6 intake manifold with this setup onto the original hosing and wiring of the A6 with no modification?

 

You can get an OBD0 to OBD1 wire conversion harness off ebay ($50) that supports external wiring for 4 wire O2 and Vtec. But this does require wiring external plugs.
The cheapest route usually requires modifications.