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 ------