are the internals on the block different between the motors...and i want to swap my non-vtec for a vtec and add some turbo...should i go with jdm d15b vtec d16y8 or d16z6

 

One has VTEC the other doesnt, also the VTEC one has a more aggressive cam in it.

 

ok well which is better? jdm d15b vtec or d16y8/z6????

 

What do you want it for?

https://honda-tech.com/zerothread?id=878010

 

the jdm d15 has a better r/s ratio than the us d15s and the d16s. youll get slightly more torque from the 1.6, but the y-motors(d16y7,y8,y5) all have reduced oil pump capacity (about 35%). i would suggest a d16z6. it has the best head design for FI, easier to find parts for and about the same price or less than a jdm d15b.

btw: check out d-series.org for ANY info you need. the people there are very helpful.

 

you should also take into consideration the fact that if you buy a d15b from a shop, it most likely doesn't have many miles in it unless it has been passed around. If it's directly from japan, they usually guarantee less than 40,000 miles or something like that.

A d16z6 on the other hand more than likely has a lot more miles on it.

just something to consider.

 

z6 head is identical to jdm d15 vtec