how high can a miata boost
 

How high can a stock miata boost ?

Plenty of us run approx. 15 psi safely on stock internals, by using aftermarket engine computers, premium gas, constantly monitoring AFR, etc.

Few people dare exceed that much without built motors.

But I'm sure other people here will post replies with more detailed answers, and/or flames for asking such a dumb question without searching first.

Either way I look forward to reading them.

in for pending amusement

Heads up Evank, I bent a rod at 15psi, almost took out the motor.

OP, you're going to get some "colorful" responses, don't take it personally and use the search function. There have been lots of posts on this subject.

Up to about 15,000ft. But you should keep a close eye on AFRs when driving in the mountains.

Wait, stock Miatas don't have turbos.

With the right engine management you are good to 15/16psi on stock internals in my experience. I ran those values on a stock 1.6L FM2, then later with headwork, TEC3r, WI and a GT2860RS (0.86AR) for 60k miles with no problem. During that time the engine power went from 230bhp to 280bhp or so with the later additions. Torque (and rpm) is probably a better measure of how far you can go on stock internals though.

Why would a stock miata be boosted? What generation are we talking here?

Greetings, yajkenji. As you've no doubt noticed by now, some questions get asked so often around here that the locals tire of them.

Short answer: there are many, many variables other than just boost pressure which influence how much the motor will stand up to before you break it. Engine management, charge cooling, state of tune, turbo size / efficiency, mechanical empathy, phase of the moon, etc.

Some folks are putting down 250 HP on stock internals. Others have cracked pistons and bent rods below 200.

:wavey:

20g's, son.

*facepalm*

How much boost on a gt2554 or on a gt3071?

There's a huge difference...

Don't forget, there may also be a butterfly flapping it's wings in Japan! That could change everything.:laugh:

mooothraaaaaaaaa!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

It is a common misconception that the use of the apostrophe is appropriate in the possessive form of the word "it."

While the apostrophe is generally used to create the possessive construct of a noun (including indefinite pronouns), it is not used to indicate possession in the case of a personal pronoun such as yours, his, hers, ours, its, theirs, and whose.

The only situation in which an apostrophe is used with "it" is to form contractions such as "it is" and "it has."

You know... when those mini Asian chicks started singing... It kind of freaked me out.

I'm scared of clowns too. Just so you know.

Thank you good sir, I stand corrected.

42.

Yes... and it is quite a trek sometimes.:giggle:

I dunno how tall are your jackstands?

Great reply!:bowrofl:

About three spliffs high if you stay focused.

Well the bone-stock MSM runs around 7.5 psi. So that's how much a stock Miata boosts. It's never safe to change your car from factory settings, right? ;)

No never. Just mentioning any type of modification is grounds for engine failure.

Judging by the questions I would say the OP should lower the boost on a MSM and stick to 0 for NA.

we talking about a 90-97

14.54psi in pressure and 16,298ft in altitude. Upgraded muffler bearing may be good for an extra psi or two.

I am running about 16 psi at 4000-5000 rpm. The boost then rises to about 18 at 7000 rpm.

If you look at the torque curves for the 1.8, you will see a rapid drop about 5000 rpm. I have set up the boost control to try to flatten out the torque curve. I think this is safe since it is the torque that bends rods. So far the stock internals are holding. This is a 1994 which has the lowest comp ratio of all years I believe. It also has 107K miles and the piston rings are worn, so the cylinder pressures are probably not that excessive.

This assumes knock control, premium fuel, wideband O2 feedback, rich mixture, etc. to keep things safe.

Good Luck,
Barry

I would say its safe to say that 12-14 psi is safe depending on many other variables; engine condition, turbo trim, setup etc. Just get a standalone and have a reputable tuner sort everything out. By the way 12-14 psi depending on your goals should be a quick miata (220-260whp depending on turbo size).:fawk:

A stock 90-97 Miata can boost to exactly 14.696psi, at sea level. Your Miata would be slightly less in Kansas City.

eleventy psi

Schfifty five.

Im on 20psi son... and I add 1% sugar for every gallon of premiun I pump, makes a really sweet ride. :skid:

25 psi on a 3071 or 6 on a 2554. I wouldn't go higher.
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32 psi. once.

Woot group-x

you ------