I have a stock y7 and I am wanting to swap it for a Vtec motor. I'm going to stick with the D series but I'm uncertain which would be the best platform for boost, also needs to pass California smog. Which is no joke out here.
What do you guys think?

JDM D15b?
USDM Y8? Or just boost the Y7 (kinda high miles though)

Any other options you guys can think of, or have had experience with?

I have very little experience w/D's mostly just messed with B's and K's.
Thanks

 

slap that vtak head yo

 

y8 head/y8 mani for that setup or y8 mani on y7 and boost

 

find a z6, basically the same as d15b but everywhere... they will give 250hp range stock internals.

 

Y8.

 

I would suggest running a d16z6. The y series of the d series engines always had rod bearing problems because of oiling issues. This is related to a lack luster oil pump. If you shim it that should help but the z6 is just a nicer motor to work with in my opinion.

 

All good points, however the OP isn't going to be able to pass california emissions with a Z6. From an emissions standpoint a D16Y8 is going to be the most hassle free way to go.

 

My friend has a D15B in his '96 CX with a t3/t4 and makes about 200whp at like 6 or 7 psi. And the tranny has LSD

 

D16Z6 if you weren't in CA, but it looks like D16Y8 is what you're gonna have to go with.

Or you could put a D16Y8 head on the D16Y7 for less money.


What 1kleenef said is true about the rod bearings on the D16Y's.

 

I heard that putting an SI intake (fuel rail, intake mani, ...etc) on the y7 gives you a pretty good start!

 

yes it does, and my vote would also be the d16y8, since california is so strict. Or move to a different state and do whatever you want haha

 

Have you checked out the D series web forums ?

d-series.org and turbod16.com

 

y8 with a z6 oil pump

 

What is the different between the 2? Will it lubricate better than the y8 oil pump? Power difference?

 

To clarify for anyone who doesn't know, this guy lives in Canada so the Si he speaks of is our EX, so a D16Y8 intake.

As has been covered, the Y's oil pumps suck, which is the primary reason that most people say the D16Z6 is better.

 

true I should of been more precise! thx for clarifying!

 

D16z6.

 

B18c5

 

if you're not going to say anything that has to do with the topic, then stfu

 

I would go with the y8, and the y8 head has a better combustion chamber with quench zones and to me would be the better choice. I don't know about the laws in some states but isn't illegal to swap a motor from a older car to a newer car or at least from a older generation to a newer one

 

since yur in cali, put the Y8, if u werent Z6 all day

 

yes it is illegal, to swap older motor into newer car, the y8 head is not better than the Z6

 

go with the y8. you can't legally smog a z6, since it must be from the same year or newer.

also a mini-me is also out of the question, since that ain't smog legal either.

if you're gonna turbo, your only legal choices are the Greddy kit or Edelbrock kit.

 

So I guess Y8 it is, or I might just boost my Y7. Thanks everyone for the support on this topic. I hate the stupid laws in CA, but there are ways around that. Just cost some $$.

Just to clarify, why would a Y8 head on my Y7 block (mini me) not pass smog, if I use a Y8 ecu and harness? Will the Z6 oil pump bolt up direct to a Y block?

 

not to thread jack, but i have a d15z1, going turbo, i'm in cali, but i really dont care about smog, i can get around it. should i slap on a y8 head? or just junk the whole motor and get a z6 or a y8? whatever i can get my hands on. keep in mind that my d15z1 only has 50k on it.