I have been searching and searching, and can't really find what it is that I am looking for, so please, if you have a link to direct me to that can be helpful, just put it up. I don't really ask for much help, I try to find it on my own as best as possible, but this is just a little frustrating.

I bought and rebuilt a D16Z6 for my 98 Civic EX, and decided to throw my Y8 head on it because the other head looked like a disaster. My other Y8 spun on itself from oil starvation (it was my fault, but i didnt realize it was burning oil as fast as it was).

Anyway, I purchased the Neptune RTP tuning supplies and got a NGK AFX wideband, and I have a t3/t4 turbo with a cast iron manifold on this setup. The engine is pretty much stock, nothing other than the turbo kit installed with DSM 450cc black tops (no upgrades in rods/pistons/valves etc.).

Before I really start to get deep into tuning this, what should I be on the lookout for? I took it down the street just watching my fuel ratio, and thought I'd try to let it go up into the rpm's a little to see where it was, and it is acting like it's hitting a wall right around where the VTEC crossover point is set at 4875 rpms.

I understand in the Z6, the ignition timing works off a base of 16* and the Y8 works off 12* but I don't know how different the numbers are in comparison with each other. The car idles great, drives like it normally would just putting around carefully. Are there any maps already set up that I could just look at, or is this just something anyone could help out with?

Thanks in advance,

Joshua

 

The Z6 sprocket and Y8 cam can throw off your timing, be sure you don't have a mechanical error before you tune, and be adviised sometimes the cam alignment can appear correct but it's actually a full tooth retarded. check this thread first.
http://www.d-series.org/forums/engin...-sprocket.html

Otherwise if it is in fact a tuning issue, most likely it's too lean or you may have a safety boost limiter in the rom. Or you didn't upload a rom and it's in limp mode.
You should be able to use the stock Z6 maps adjusted for 450cc to get started without any trouble. You can read my tuning manual (sig) it's not for Neptune, however the principles are the same.

 

That link was very informative, however explains about the different cam gears on the opposite camshaft (Z6 gear on Y8 cam and the other way). I've just got a completely stock Y8 head with its OEM Y8 gear and cam. I guess I'm just confused about how exactly it's reacting under there because mechanically, I have set both to TDC and installed the timing belt, and it fired up seemingly perfect.

But - you are spot on with it running lean. I have been noticing that I've been adding fuel in the maps rather than expecting it to run rich when I created the base map for it. At first it was well above 16:1 somewhere - the AFX won't register that high - but it took considerably enough fuel addition to bring it to the 15 zone.

Should I just keep it that way, and adjust the ignition maps accordingly? I haven't heard any knock from the engine, but does that mean there isn't any or could it be knocking without making audible noise for my ears to pick up?

 

your cam timing is probably ok, you should use a timing light to verify it before you continue.
knock is usually pretty audible, but check the spark plugs to see if there's any signs.
You probably just need to adjust the injector offset or flow rating, DSM injectors don't actually flow at 450cc, especially older ones. Nail all the AFRs first before you start with ignition, but it's not as easy as advancing until it knocks, you need graphing utilities or a dyno to safely tune your ignition. This is well documented on PGMFI.org, I'd suggest you start reading.