Hey guys, I haven't really been able to find expected HP numbers for my upcoming build.

Here's the specs;
BP-05 with a BP4W head, the head itself has had a very basic portwork, I believe it to have a slightly mild increase over stock, either way I got it for $100 and it will be way better than the BP-05 for now.
It's will getting a port match and polish on exhaust side.

Cams, I have about 275* with about 8.5-9mm lift in mind, don't really want to go digging away the lifter bosses, I'm getting a billet ground up. I'm still very undecided on duration though but I will be having adjustable cam gears.
Will have upgraded valve springs and retainers and shim under bucket lifters

Pistons I'm still yet to decide, I was thinking 9.1 for the moment as I will be bolting up the T28 I have sitting here for ages now, just need the cash first, but either way I will be beating around NA for a few months or so.

ECU is DIYPNP
intake and 4-2-1 headers

I'm looking at roughly about 150HP, does this sound about right?

 

What fuel?

If you aren't running E85, you are going to want 8.5:1 for FI.

Your T28 could get you to 250+ without any headwork or cams.

Edit: I see, you want to know how much power you will be making n/a before you put the turbo on. Gotcha. The Miata N/A Power Bible as told by Emillio

 

Is there differences between your 93 octane and 98 that I get here in Australia? I'd like to run E85 majority of the time but id also like the flexibility of 98.

Yeah I know the headwork is unnecessary for my 220hp power goal but i've gotten everything (for quite cheap) minus the cams.

But thanks for that link, I'll read into it

 

Also in Australia, everybody that is hitting 250hp is doing fine on 9.1 on 98. I'd love to go 11.2 but I don't want to be restricted to purely E85

I'm also going 9.1 because I'm just planning on reusing the stock pistons with a re-ring and hone, and some forged rods just for peace in mind that I won't bend something incase I do ever see 250-280hp.

How does a 8.5 cr motor perform NA anyways? I have this big fear of sacrificing response for power levels way beyond what I would ever need/want.

 

like crap

 

Haha yeah I figured. Seems like I'll be able to hit 150hp with just bolts ons and a tune. Whereas other information I've gotten said I'd only hit 135hp. I'm not sure what to believe now :/

 

LOL you realize that dyno variations can be up to 15+hp. If you really think all these "predictions" are within 1hp of the actual results you should see you're dreaming.

What the guys suggested are solid mods though, and should result in a nice little n/a track car you can rely on.

 

Yep fully aware, there's a mx5 specialist in Sydney and their dyno is is quite optimistic so to speak. Either way if I can get 150hp NA I'd be happy. It would be quite a fun street and track beater until I slap the turbo on

It's just nice to know how much power I can expect, I'm getting all excited to get the motor done and drop it in with the 6 speed

 

For 150 whp: get a 99-00 head with P&P work, +1mm valves and MSM intake camshaft, a VVT bottom end, tuned ECU with AFM delete, I/H/E.

That stuff above should do the trick.

 

Remember to account for the temperature as you are in 30degC average day temp. I would want to run e85 on any hi powered car over there.
You'll need some serious cooling power!
I'm lucky that I live in NZ and an average day is 13degC people here run huge power with very little worry about to much heat