Opinions on options for some mo' powa
 

I've already got all the boring stuff out of the way. Forged pistons/rods, BE oil pump, CSF radiator, coolant reroute, arp heads/mains, high flow fuel rail, brakes, wheels, tires, tapped oil pan, even fun aero bits, etc.. I'm looking at going big. (400whpish)
My shopping list for turbo parts sits as this:
BW6258 (still undecided)
Probably sticking with a fm/begi mani (still undecided)
Custom downpipe/exhaust by my exhaust shop
ID1000 Injectors
Walbro 255LPH-HP Fuel Pump
MS3x by Braineack
SS water and oil lines
Fab9 Stage 2 Intercooler
TS Kompact BOV
LS2 Coils
DIY Catch can
Various gauges such as AFR, water and oil temps, and boost.

Probably forgetting some things.
What do you guys think about this lil' list? What would you change? Upgrade parts? Downgrade Parts? I think I've got it pretty well planned, just want some voices on it.
First engine build for me (still in highschool), so bear with me.

It seems like you've done some research, so I guess the biggest question is what are you going to use the car for?

Car will be for autox/street/and potentially road racing in the future.

If you don't plan to use e85 you will need a bigger turbo for 400hp. The 6258 might make it on e85 but it will be everything it has. On pump gas you'll need at least a 6758 to hit 400.

Looks like a good plan. If it were me, the only thing I'd change would be to go for the TSE mani. I just think it's a better piece than the FM (which is what I currently have on my engine) or the BEGI.

...carry on.

EFR 6758 on a TSE setup is what you need. I don't think the Begi/FM manifold will fit the EFR and let you easily make a 3" down pipe.

I wouldn't be opposed to e85. There's a mapco right around the corner that sells it. I haven't looked into it that much, but in that case, I'd change fuel pumps to a DW300 and add a solid FPR. Is there much else that should be tweaked with e85 in mind?

Didn't see an oil cooler on your list. I have a feeling you'll want one if you're running even close to 300rwhp on track let alone 400.

EFR won't fit on the FM or Bell manifolds. The only kit available that uses the correct turbine housing is the Trackspeed kit.

Really interested in the TSE setup. Sav, any idea when the intercooler and piping will be included in the kit? Also, with this kind of power I would imagine 5-speeds would break every month or so. Would you guys recommend going 6-speed or rx-7 conversion, or something else?

Intercooler and piping, just do yourself and buy a Precision 600hp.

TSE 6758 is your only real option if you're going to be doing this nowadays.

Basically.....

https://www.miataturbo.net/build-thr...hp-bust-84579/

You're going to eat 6 speed transmissions like some tasty banana nut bread. :rofl:

Hope you have deep pockets, and a bunch of spare time. Approximately 300 was difficult to autocross, for me. Absolutely nothing like 125 hp where throttle controll can be overlooked.

Yeah, you might want to find an MSM 6 speed trans if you can.

Mocking up final IC location and pipe protos right now, but the production timeline will depend on my manufacturer. No ETA right now.

5-speeds behind a 300+whp car will last about as long as a Kardashian marriage. At 400whp you may not even get off the dyno with it. We are working on a T5 swap right now that will handle the power, so for now, get a 6-speed and be nice to it.

For 400whp, you need the 6758. It's not quite as crisp and smooth as the 6258, but it's leagues better than any other turbo capable of making the power. The 6758 feels similar to a GT2860RS with better transient response above 3500rpm.

6-speed and be nice to it sounds good for now. All in all sounds like it will be about $5000 or so; give or take. Already $7000 into it making it as bulletproof as i can. Just spent $500 on paint a few minutes ago. Definitely a fantastic financial decision for an 18 year old. :burncash: I don't think I'm overlooking anything. I hope not.

I think 400 might be possible on the 6258, but you're gonna have to run ALLOFIT and the rest of your setup better be tip top.

I don't know if you drove/rode in a true 400whp BP Turbo Miata, but many people don't even understand how violent and ridiculous it is. There's a reason there are so few of them out there.

True... a ride in a 310whp miata sold me on not thinking I'll ever need much more. 1st and 2nd are just redline. 3rd is redline unless you feed into it. 4th is 110mph. So.

My main thing is, I built the engine before i had researched too much. Now that it's built, I 100% want at least 300 to put the engine to the usage it deserves. I would be happy with 300-350 too. 400 would be fun though.

You just don't understand.
But who am I to stop you? lol. By all means, carry on :)

...Get the 7163 if you really want to do things for science :party:

Hehe. I understand. The first time i rode in a 250whp miata i almost peed a little. If i realize it's too much to even enjoy I'll just sell it and go smaller. I just wanted to break 250 due to it already being built.