Word of advice please on my T25
 

I recently bought a t25 similar to this: Garrett T25 turbocharger A R 48 EX 49 | eBay

But it seems that most of the downpipes available out there are 4 bolt and this one is 3.

what should i do?
thanks everyone!

Not that this will be much help, but...the FM and Bell Engineering stuff is 5-bolt.

Get a shop to make you a downpipe? Make your own downpipe? Or sell said turbo and buy one with a 5 bolt flange and profit.

what metal shop in san antonio would do that?

Bell Engineering isn't too far from you. Hell, any half-way decent shop could easily fab one up. Do some searching for trusted shops in the area and you should be good to go.

Oh, and of course wait until you have the turbo in hand. A 3-bolt seems really weird to me (not much experience), and the ebay listing didn't have decent photos. Maybe it's a 5-bolt with two studs missing or sheared off...

Just looked it up. Yeah, you'll have to do a custom setup.

Ya but it looks like the whole housing is that way

It probably looks like this:
https://www.miataturbo.net/attachmen...ine=1355017185

Get a flange and a custom downpipe made. No big deal.

That outlet and DP would be a piece of cake to fab up. How much power are you trying to make/ how much boost do you plan on running though?

I seen a 3 bolt flange, believe it was 2.5". That converted it to v band. I will update this with a link when I find it!

^^ yes thats the piece you want! Any half way decent shop can build a dp with a v band flange for you

ok. im on a very low budget. I was lucky to get it at $155 tho!

very first turbo install :)

i'll keep y'all posted

Sweet I just boost mine for about 1600 including clutch job!!!

how much boost could i obtain with the stock fuel system?

None. You must alter the FPR or injectors (or add a piggyback/standalone) to add boost to the car.

How stock? Stock injectors - none (that I'm aware of). I've heard the stock fuel pump is good for 10-12 ish psi.

Yeah, and what Andrew said. Stock ecu is good for zero boost.

I hope you realize this is not a smart question. Boost is not absolute, it's different based on many other parameters. Usually though the stock injectors run out around 150whp area.

I would look for atleast a FMU, there easy to obtain and will allow you to run a low boost setting. Be sure to retard your timing some to help keep knock away if your running a stock ecu. Usually retarding 4 degrees ahould be a safe bet for around 5-6 psi with a FMU.

ok. since everything on my car is stock I'm aiming for 6psi. I presume the stock 1.8 injectors should be sufficient for my 1.6?

Yep, there the ones that most of us use. I myself am running a set of 1.8l injectors and a fmu also just retarded my timing and im im 7ish psi right now

Please read:

Fuel Injectors - Miata Turbo FAQ
Adjustable Fuel Pressure Regulator - Miata Turbo FAQ
Fuel Pump - Miata Turbo FAQ

But don't stop with those pages. TONS of stuff on there you need to read up on before you go any further.

If I got bigger injectors, would a fmu be necessary?

The FAQ says stock injectors are good up to 6 psi.. Could I do that without a fmu?

You need the FMU to raise the fuel pressure with boost. That increases your fuel flow or cc`s. With out a FMU its not gonna work

You need the FMU to raise the fuel pressure with boost. That increases your fuel flow or cc`s. With out a FMU its not gonna work

Just out of curiosity, what manifold are you running?

plan to weld together a custom 304 ss manifold

Theres so many holes, how do i know which ones the oil drain and feed and such?

I see. Corct me if im wrong, but it uses the pressure in the intake to boost the fuel pressure?

[Wille=firefaux;959264]Theres so many holes, how do i know which ones the oil drain and feed and such?[/quote]

Are you sure you should be installing a turbo? The oil drain will be easy, it has two bolts. The oil feed is exactly opposite. The remaining two are water. They are not directional. And yes you will probably have to clock the turbo (rotate it).

Yes, in a round about kinda way it work just like a Rising rate fuel pressure regulator, for every lb of boost it will increase fuel pressure by a said amount.

ok. sweet. One more question: given that the exhaust port for my turbo is a 3 bolt and the wastegate recirculates the gases back to the turbine, would i have to setup my system differently in any way or is it all pretty standard?

https://www.miataturbo.net/attachmen...ine=1337225466

You have an internal wastegate. You just need to have a downpipe made with the proper flange.

All the wastegate does in a dumbed down manner is allow exhaust gasses to BYPASS the exhaust turbine so you only make the appropiate boost (in this case what ever boost pressure your wastegate is set at) with out it the turbo would just spin till it popped.

just got some 97 injectors and a procharger fmu.
now as for the installation, the top goes to the intake pressure, the middle goes to the gas input and bottom goes to gas return???

NOTE: THIS PICTURE IS UPSIDE DOWN
https://www.miataturbo.net/attachmen...ine=1355896036

just got 1.8 injectors, procharger fmu, 255lph hp fuel pump, and a cheap ebay cast iron mani im planning to cut relief lines on. would a MSD Boost Control sufficient for low boost mods? if so how much boost?

would one of these work? or even needed? MSD Boost Ignition Timing Unit for Miata 1990-1997

Is that a 1:1 FMU or a rising rate FMU ? I don't know anything much about FMUs but know that the rising rate FMU raises the fuel pressure by 8 or 12 lbs (or something) for every pound of manifold air pressure increase and that you can change an internal part to adjust how much it rises per pound of manifold pressure to change the fuel air ratio.

Do you have a wideband oxygen sensor or are you going to run a small hose up to the cabin to smell the exhaust under boost to tell if it is rich or lean?

ya i plan to have a wideband sensor

my question is: if i have the fmu, would i need the MSD ignition controller?

They're meant for two different things.

The FMU adds more fuel under boost.
The MSD retards the ignition timing under boost.

It looks like something retarded is going to be under boost.

And he didn't answer my very important question about the FMU.

https://www.miataturbo.net/attachmen...ine=1359755016

thank you good sir.

would i have to get the msd ignition kit for the miata specifically?