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Old 08-11-2013, 04:14 AM   #1
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Default Need assistance with upgrading boost level

I just bought a 1990 Miata with a 1.6 L. It has a Flying Miata Garrett Turbo with cooler. I can see that it has after market injecters, exhaust, wires, ect. it is curently running 11 psi and runs good. It also has a DIY computer, along with a crap load of suspention, brake, and wheel and tire upgrades. and a cool rollbar. I was told that the head and long block were suposed to be upgraded as well along with the clutch and things. My question for you fine folks is how much more boost can I run and what elese needs to be done to get say 16-17 psi going safely. I was told that the turbo could produce 20 psi if needed. The car has a moderate tune (93 octain) due to the car getting crazy on the road course with more power. Im more of a freeway fan my self so im not trying to see less power, I would like to see about 75 HP more. Im not against water meth injection. Pleas help....Thanks!
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Old 08-11-2013, 04:28 AM   #2
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all of it
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Old 08-11-2013, 04:34 AM   #3
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The first order of business is to assess the car and the turbo setup to make sure it's not going to blow up at the pressure it is at now. Tell us everything you know about the turbo. Take pictures of the manifold that the turbo is attached to as well as the front and back of the turbo. Post those pictures here and you will get a much better response.

Next, 16-17psi means nothing to us. On a Garrett 2554 that might be 200hp. On a Garrett 2871 that would be near 300. You say it has a DIY computer. Are you referring to a Megasquirt? If so, good start. Did you get a laptop with it for tuning purposes? If not, you will want to pick up a cheap one to keep around and log with. You will have some learning to do before you will want to "turn up the boost," but it is completely doable with electronic boost control if it is indeed a megasquirt.

Miataturbo.net is not a place where you can expect to be spoon-fed. While we wait for pics etc, read the stickies and learn all you can.
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Old 08-11-2013, 06:28 AM   #4
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I will try to get pics of the turbo up. My Iphone went for a swim last week in the lake so it may take a few. I was told the car was making 260-280 rwhp. I realy dont rember witch one he said. I do know that it ran mid 12's in the 1/4 mile with a 280lb driver on street tires. I think its a mega squirt. It has a DIY Autotune sticker on the airbox.
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Old 08-11-2013, 10:29 AM   #5
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Listen, if you can't answer this question yourself, then it's not a good idea for you to touch the car in any way, shape, or form. That doesn't mean you can't do anything. It means you need to understand your car better, and to do that you should do some research. That doesn't mean we should do research for you, because you will never learn that way. Go and read every sticky thread on here about MS, turboing your car, etc... Then most likely you will be able to answer this question yourself.
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Old 08-11-2013, 05:01 PM   #6
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Originally Posted by ratboy3995 View Post
I will try to get pics of the turbo up. My Iphone went for a swim last week in the lake so it may take a few. I was told the car was making 260-280 rwhp. I realy dont rember witch one he said. I do know that it ran mid 12's in the 1/4 mile with a 280lb driver on street tires. I think its a mega squirt. It has a DIY Autotune sticker on the airbox.
Dont buy another one of those pieces of crap... get a REAL smart phone that takes GOOD pictures, especially if you plan on posting pics on here from your cell phone... lol

it SOUNDS like you have a decent well built car, a little reading on here, and you can seriously unlock lots of untouched potential, if the car indeed has all the parts you mentioned. Sounds like you got a pretty sweet deal though. Check out all the stickies on here, and you should find everything you need!

Welcome to Miataturbo!!!
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Old 08-11-2013, 06:16 PM   #7
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I guess I should explain myself better. I am new to the Miata turbo world...not to racing or building my own ride. I come from the world of American muscle cars. Most most recent car was a 1988 Mustang LX coup. It was a 1/4 mile, nice street car (i.e. a/c, power brakes, ect). It was a Dart based, 363 stroker (409 rwhp on pump gas). Ran low 11's on motor, with street tires. The point is I know how to build a car. I just don't know what needs to be done to these little 95 ci motors before you can really hang some power to them. Are the motors forged, how much HP before the fuel system gives up, ect. And does anyone know where to find a rear end with a 3:?? ratio. running out of gear at 125 mph, turning 7k, in 5th gear, SUCKS! I thought this car would be a cool change and maybe even a chalange...so any info would help, and yes, Im doing my own research as well.
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Old 08-11-2013, 06:22 PM   #8
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Quote:
Originally Posted by ratboy3995 View Post
I guess I should explain myself better. I am new to the Miata turbo world...not to racing or building my own ride. I come from the world of American muscle cars. Most most recent car was a 1988 Mustang LX coup. It was a 1/4 mile, nice street car (i.e. a/c, power brakes, ect). It was a Dart based, 363 stroker (409 rwhp on pump gas). Ran low 11's on motor, with street tires. The point is I know how to build a car. I just don't know what needs to be done to these little 95 ci motors before you can really hang some power to them. Are the motors forged, how much HP before the fuel system gives up, ect. And does anyone know where to find a rear end with a 3:?? ratio. running out of gear at 125 mph, turning 7k, in 5th gear, SUCKS! I thought this car would be a cool change and maybe even a chalange...so any info would help, and yes, Im doing my own research as well.
Check the classifieds on here. There is always people selling 3.?? Torsen LSD rears. Usually you can find a package deal with drive shafts and stuff included. I havent seen a bad price on any of them yet.

As for the Engines in the Miatas, Everything is pretty well documented on here. They can handle alot of power stock. But rods are the weak point for the most part. Next would be to ditch the 5 spd for a 6.

Everything can be found through MiataTurbo. just check out the stickies. Lots and Lots of good information... including the weak points, the strong points, and the best PROVEN paths to take when going FI on a miata
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Old 08-11-2013, 06:24 PM   #9
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Cool Story Bro.

You can find all of those answers within 10 minutes of searching. Honestly. I'm not even exaggerating a little bit. Lucky for you the search bar doesn't even require proper grammar.

Edit: Actually your grammar isn't bad. I think I just read it as having bad grammar because most people that give responses like that have bad grammar.

Last edited by FRT_Fun; 08-11-2013 at 06:46 PM.
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Old 08-11-2013, 06:35 PM   #10
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Quote:
Originally Posted by ratboy3995 View Post
I guess I should explain myself better. I am new to the Miata turbo world...not to racing or building my own ride. I come from the world of American muscle cars. Most most recent car was a 1988 Mustang LX coup. It was a 1/4 mile, nice street car (i.e. a/c, power brakes, ect). It was a Dart based, 363 stroker (409 rwhp on pump gas). Ran low 11's on motor, with street tires. The point is I know how to build a car. I just don't know what needs to be done to these little 95 ci motors before you can really hang some power to them. Are the motors forged, how much HP before the fuel system gives up, ect. And does anyone know where to find a rear end with a 3:?? ratio. running out of gear at 125 mph, turning 7k, in 5th gear, SUCKS! I thought this car would be a cool change and maybe even a chalange...so any info would help, and yes, Im doing my own research as well.
So basically you just told us you know NOTHING about import cars and are the equivalent of a complete n00b that has to start from baby steps.

Take all the muscle car knowledge, wad it up, and throw it in the trash. Most of it won't help you, and in fact much of those strategies will end up hurting your car and making you FAIL, if you apply them.

These cars have nothing in common with the mustang, or any muscle car for that matter. The people that come into this platform with bad habbits (picked up from cars that are modded and tuned way differently) usually shoot themselves in the foot the most, and are too stubborn and ignorant to humble themselves and learn the PROPER way to do things, because think THINK they already know what they're doing based on their previous car knowledge with other platforms.
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Old 08-11-2013, 06:46 PM   #11
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If you already have that much power, chances are good the original owner upgraded the diff to the larger diff that started in 94 when the Miata came with a 1.8. All you need is a taller gear. Search about diffs on the forum.

If you are spending much time at the drag strip, you may consider welding an open carrier. It is what I did, and find it to have decent manners on the street. Factory torsens do not live very long at the drag strip. The other option is a aftermarket limited slip, but you will pay, and I do not think it is worth it unless you are doing some road coarse track days.

I started out in the American Muscle cars as well. Once I got into Miatas I was hooked. You do not have to go as fast to have fun with these cars, but you can make them pretty darn fast.

Good luck. Get back to us with what kind of turbo you have. Post some pics.
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Old 08-11-2013, 08:11 PM   #12
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OP doesnt read.

You have done no research.

Asking us to answer all of your basic questions doesnt count as research.

Search.

Dann
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Old 08-11-2013, 10:29 PM   #13
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This needs to be a sticky.
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Old 08-12-2013, 02:05 PM   #14
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The following dyno graph is typical for most boosted Miatas running ALLOFIT on a small turbo.



They tend to have a good strong rise up to their peak torque.
They then make peak torque around 4500 rpm and peak horsepower at about 5700 rpm.
The torque and horsepower then tend to taper off pretty substantially right down to the floor.
Sometimes this requires a mop or a rag.
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Old 08-12-2013, 02:08 PM   #15
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Just turn up the **** and see what happens.
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Old 08-12-2013, 02:16 PM   #16
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Quote:
Originally Posted by sixshooter View Post
The following dyno graph is typical for most boosted Miatas running ALLOFIT on a small turbo.



They tend to have a good strong rise up to their peak torque.
They then make peak torque around 4500 rpm and peak horsepower at about 5700 rpm.
The torque and horsepower then tend to taper off pretty substantially right down to the floor.
Sometimes this requires a mop or a rag.
oldie but still funny
I feel like between danns compressor chart and this dyno we pretty much have the HOLY GRAIL of miata turbocharging
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Old 08-12-2013, 03:45 PM   #17
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First thing's first. Find a mirror, look into it, and tell yourself "I'm an idiot when it comes to turbo Miatas"

You're Overconfident in your abilities, but you're Incompetent when it comes to this car. Another way of saying this is that you're unconsciously incompetent - that is "you have no idea how much you really don't know"

If there was an easy way to *reliably* run more than 11psi of boost and not run into other problems while doing it, don't you think the previous owner would have done that?

I would recommend that you drive that car like you've got an egg on the gas pedal, especially if you didn't know this particular car for several months before making the purchase. Do you know if the previous seller turned the boost up to 11psi in order to help sell the car after running no higher than 8psi for 5 years? 3psi makes a world of difference to engine internals and reliability. You should go through a phase of conscious incompetence where you actually know you're a dummy, and then eventually a phase of conscious competence, where you can do pretty good if you pay attention and stay focused on what you're doing.

The information that you *want* is right here:
https://www.miataturbo.net/diy-turbo...k-links-56507/

But the information that you *need* is here:
https://www.miataturbo.net/diy-turbo...big-post-4288/
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Old 08-14-2013, 08:39 PM   #18
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I have been around cars my entire life. But I have never been around the number of small dick ******** that are on this site. I do appreciate the few nice people that act as if they have manners and have given helpful input. I see now why most people don't deal with the Miata....it's not the car, its the company! And who the **** cares about perfect grammer on a car forum....join an English forum if you are that gay fucktard!!!
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Old 08-14-2013, 08:44 PM   #19
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We're small dicked ******** because we won't hold your hand and suck your dick while we fix your car for you?

That's your problem, you've been around cars your whole life. I haven't, so I knew how much I didn't know when I joined. You can find out the easy way by reading, or the hard way by blowing up your engine. Your choice fucktard.
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Old 08-14-2013, 09:31 PM   #20
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I may not no **** about this little car.....but Im quite sure it will smoke that little pice of **** car your sporting champ...just saying.
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