1.8L 99 Miata 250WHP help
 

Hey, this is my first time ever posting/using a forum before, so sorry if im posting in the wrong section or if my questions have already been answered somewhere else. I am looking to make 250hp from a stock motor with a turbocharger. This is my first ever project so suggestions and criticisms are greatly appreciated.

Questions : Do i need forged rods/pistons for my engine with the power i want to make ( i want it to be reliable and still a daily driver)
If so what rods/pistons do you recommend i dont know much about knock and slap but i heard some forged internals cause this.
What turbo would be recommended for this?
Do i need different injectors, or anything for the fuel delivery system?
Im looking to get a megasquirt and tune myself (hopefully) anyone think differently?
E85 or premium 93 for fuel.

Thank you guys hopefully you'll be able to answer all my questions or just create new ones xD

Youll be on the edge of rod territory, but pistons wont be needed. $240 ebay rods FTW.
Turbo- search
Injectors- yes, GT500, ID1000s, or other various EV14 injectors available.
Many here have tuned their own cars. Megasquirt the car first, learn to tune, install larger injectors and do it again. Then add forced induction.

What brand of ebay rods are you suggesting?
Also i found these Injector Dynamics 1000.11.02.60.11.4 ID1000 Injectors 90-05 Mazda Miata injectors will those be fine or are they overkill? ($480)

The kind of questions you're asking is like asking if you need a scalpel or a machete for brain surgery...... If you don't even know what parts you need, you need to be reading and researching more.

okay, ive read more about injectors. I have done a calculation to see what kind of injectors i need. For 250hp i need at least 455cc, buf for some wiggle room i found this really nice 640cc injector kit for $299. Seems reasonable.

You didn't even say what kit you found. But I know its the flowforce kit which you cant go wrong with.

Also, what's your budget?

Yes it is the flow force kit... My bad it was late for me 😂 and also I really don't have a strict budget just don't want to spend much more than 3-4 grand. But I don't want to be el cheapo and have my car blow up from eBay parts.

With your budget, get an MK TURBO kit (vendor here), a Megasquirt, a wideband, ACT or FM1 clutch, and the injectors mentioned above. Ebay rods may not be needed if you stay at or below 250whp, just don't run too much spark advance.

There is a DIY FAQ thread on this forum.

He might have trouble hitting 250whp on my setup with the stock turbo. The larger one could probably hit it no problem. With the stock turbo he would probably max out somewhere in the 220-235whp, but I've honestly not had it on a dyno yet running full tilt. Maybe one day soon I will get to it.

So I went to your website and for my miata the kit would be $1500 (which seems pretty reasonable btw) how much more would a larger one cost me?

Heres what i gathered -
- Injectors $300
- Turbo kit ($1500)
- Megasquirt $430 (doing the DIYPNP 2)
- FM clutch $350
- AEM Wideband UEGO Gauge from enjuku $180
- No intercooler??


-

Larger turbo is the same price. Just know that it spools a bit later and does not have as much torque down low. Just know that I won't be building any more NB setups till sometime in the spring of 2017.

Skip the the DIYPNP2. Buy a MS3x. It is a much better ECU overall and works far better. It is one of the places where I tell people not to skimp out on.

Intercooler and piping is all DIY. You can check out Sonofthehill and Nigelt's build threads for NB pipe routing. I recommend the Vibrant intercooler that is on Amazon. It is pretty decent bang for the buck. I think they are around $150 with prime.

You should be able to put together a really decent intercooler setup for under $3-400 total if you do it right. Don't buy a piping kit, 90% of them don't have half of what you'll need and you'll be left over with a bunch of crap you wont use. Piece it together from silicone intakes and ebay or similar.

okay as for the ms3x I just need to buy a wiring harness and wire it to the existing wires from the stock one? Also is there anything special i need to do for my certain miata to get the ecu and car working properly?

Yes...a lot of reading. And a lot of learning.

So I want to still keep costs low by building it myself. so the MS3 kit is $385 and the MS3x upgrade is $105 then I would have to buy a wiring harness $50 (pigtail). Now with all of this do I still need to add components to get what I need out of the megasquirt?
Also from what im reading there isnt a huge difference between the MS3x and MS2 that my car would actually use (correct me if im wrong I probably am) but, ill go back and read some more...

You've really gotta do some reading.... A lot of this is really well documented.
I bent three rods on a T25 at 15psi (less than 250whp) and conservative timing. YMMV.

If you're replacing the rods, do the pistons. Machine work isn't cheap, no sense redoing things later.

Has anyone told this dude to read a bunch of builds? If not, BRO, I am not exaggerating when I say that you are six months of reading away from your first dollar spent. Do not build your own ms3. Do not build your own ms3.

You said budget is ok, so buy the ms3..in six months.

Six months of school work to go.

I can buy the MS3 now its not a huge difference, im just the type of guy who loves to build everything. If what you're saying about the reading is really that bad ill just opt in for the built one. and ill do my own harness.

Ms3X. You must do the X. Please, just take my word for it. I know of what I speak regarding this matter.