I'am about to build a d16z6 on the side before I push my current stock setup to much farther. Anyways, I'am probably going to end up using the TT rods+vitara pistons combo which is about 8.5:1 compression. My question is about how much could I boost using 93 octane before getting into the danger zone of not enough octane? I was thinking at least 15psi I would love to be able to get about 20psi.

 

As long as you get a good tune, no reason you can't do 20psi+,but it all depends on choice of turbo as well.
Check this out.....
https://honda-tech.com/zerothread?id=1719843

 

it all demends onyour setup. compression has very little to do with it when it comes to Fi as long as it;s under 10:1. i run 9.5:1 and run about 20psi on pump w/o any issues. but my car is very well tuned, has a huge fuel system upgrade from tank forward and back, and has 1000cc injectors to feed it controlled from a hondata s300.

if you have a good tuner, good fuel system, and properly setup, along with a proper turbo, then you should be able to run 20psi ok.

remember it's not the PSI that kills you it's the cmf flowed form the turbo. 20psi on a t3 is not the same as 20psi on my gt30r turbo. my gt put out way more cfm than a t3 woudl expecially at that psi range. os turbo type also has a lot to do with it.

anyway, i'll stop spouting. i hope this helps some and good luck.

 

yeah, but 20psi is 20psi as far as cylinder pressure. also, I don't think you could run 20psi on 93 with a 10:1 ratio