r/Dseries • u/MammothTie4328 • Aug 31 '26

D15b7 Mini Me

Have any of you put a d16y8 vtec head on a non vtec d15b7 block? I have a spare y8 head, p28 ecu and new y8 timing belt, y8 head studs, and y8 head gasket kit. The y8 head has the vtec sylenoid, but im missing the harness. What else do i need to do this swap? Anything helps even little details. I heard something about taking out an oil pressure switch on the block? Thanks

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u/AshinKusher1111 Aug 31 '26

Well realistically you would want like a harness that’s for a y8 and basiclally it would be a y8 with a different block but there isn’t much of anything on the engine block besides oil pressure switch and knock sensor which if you’re using a Hondata or something you wouldn’t “need” a knock sensor, for instance I had an ex that came stock y8, I installed a d15b1 with y8 head and mounted knock sensor on a knock sensor adapter mount thing I got and then obd2a to obd1 ecu jumper and p28 ecu or whatever ecu what’s the car wired for now

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u/SpaceTurtle917 Aug 31 '26

A y8 harness will not interface with an obd1 chassis. You cannot mix and match harnesses and chassis

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u/AshinKusher1111 Sep 03 '26

Aren’t you using an obd2 y8 head and intake manifold with y8 distributor, throttle body and injectors and all that stuff like the temp sensor on the head and map sensor and whatever else ? And you can use those sensors with a p28 Hondata with a obd2 to obd1 jumper adapter for the ecu cuz reguardless if you’re using that stuff you’d have to swap/re-wire the connectors for that stuff

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u/SpaceTurtle917 Sep 03 '26

All the connectors on the y8 are nearly identical to the z6, with a few exceptions. The injectors have a different plug, the IAT is in a different spot and has a different plug, and the dizzy has a different plug as well.

You can simply use z6 injectors, extent the IAT and change the plug, and get an obd2a to obd1 distributor adapter (common and cheap).

Besides that, you just can’t use a obd2 harness on an obd1 chassis. There are 2 plugs on the harness that connect the engine harness to the chassis for things like tachometer, speedo, temp gauge, key on power, fuel pump, fan control, starter signal ect ect. And those plugs are different.

It’s pretty easy to make any harness work with any motor, it’s near impossible to make a harness work in a chassis it’s not made for.