I know slightly more than nothing. It's in the realm of 220. That's what virtual dyno is giving me. I'm pushing 15psi right now, granted I can't keep my boost curve flat with closed loop on the ebc for some reason. I suppose the biggest thing I want out of this build is to have a linear powerband. I hate getting pulled because my tiny turbo can't flow enough. The stock motor wouldn't like much more air thrown at it.

So, are you building this to mainly drag race? You may be disappointed no matter how much power you have.
Miatas simply aren't good drag cars.

I have a road course somewhat close to me that I plan on running. And for the occasional street pull.

Gotcha.
A well executed high power turbo build costs good money. So does a well executed v8 swap.
A lower powered turbo build is more realistic, is more drivable, and you have some parts already.
V8s sound cool.
Ask your spirit animal which path you should take.

My spirit animal has been racking my brain about this for a few weeks now. I'm leaning towards going for a 1.8 vvt and an nb 6 spd, and aim for 300whp at first. My next dilemma is whether or not to build the valvetrain. Is it worth the extra ~1k to do it?

Depends on how high you want to rev it.
I bought a head with supertech light doubles already installed for 450.
I would say yes. It's never a bad idea to overbuild.

I'm thinking 7500 for most occasions and 8000 for when I need it? Nothing crazy.

With close to 300hp I rarely find it necessary to even go to 7k. The drag strip is the only place I have felt the need to take it to 7,200. It just isn't necessary,it makes so much power in the 3.5-5k range.

I see. Well I suppose I could always decide to build the valvetrain later down the road. What compression ratio would you recommend?

See post 29 from TODAY. Now he is even talking about v8. You, he and we, are not on the same page.

~9.0 if you are on pump gas.
Higher if you have e85 available

I do have e85 available. What are your thought on water/meth?

How available is e85? Like every station, or two in your city? How often do you get away e85 being available?

I am a huge fan of 84mm 8.6:1 Supetech pistons. You give up a bit having the less compression, but your safety margin on pump gas is much higher.

Water/meth is not really big here. Mostly because a good front mount intercooler works just as well at those power levels and it does not ever run out. Just make sure you have a very good intercooler core.

Try $15k+ if you want a reliable 400hp turbo miata on the track.

Also if you are just "thinking" about running on a road course then take your 200hp there and learn to drive. You will be surprised how fast you can be with 200hp on a road course.

This thread makes me soft and flaccid.

There's two pumps within 15 minutes of my house. It's pretty great.

I'm like 15k deep in mine and I wish I would have gone v8.With that said. I still have more work to do. It'll be good when i'm finished but probably another 5k away

That's because MT is turning a new leaf. Two years ago, this guy would have been set on fire and left to live out the rest of his life on mx5.

Doesn't mean dick. Virtual dyno said my car makes like 425 or something stupid.

Well maybe you should learn how to use the program properly. It gives somewhat accurate numbers with the right values.