Miata Turbo Forum - Boost cars, acquire cats.

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-   DIY Turbo Discussion (https://www.miataturbo.net/diy-turbo-discussion-14/)
-   -   How much Boost is safe on a stock engine. (https://www.miataturbo.net/diy-turbo-discussion-14/how-much-boost-safe-stock-engine-6129/)

SamS 12-13-2006 11:42 AM


Originally Posted by AndyFloyd (Post 64231)
Rules are meant to be broken:bigtu:

How much power were you making back then?

dirtbikedude2989 04-11-2012 10:40 AM

On 5psi and running alittle lean i made 127hp at the wheels and the i got 460cc injectors and then i was running 16psi and im pretty sure i was up around 180hp then one of my rods started knocking but the money had like 240xxx on it and a stay 47 hrs of driving on it.

dirtbikedude2989 04-11-2012 10:41 AM

And i have the 1.6

dustinb 04-11-2012 10:43 AM


Originally Posted by dirtbikedude2989 (Post 862577)
And i have the 1.6

I'm sure the people who posted in this thread from 2006 will appreciate this seemingly random information. Cool story.

18psi 04-11-2012 10:54 AM

he just woke up from a 6 year hibernation don't mind him :giggle:

dirtbikedude2989 04-11-2012 11:16 AM

Lol i was googled how much power the stock motor can handle and found this post and i wasnt paying attention to the dates.

EO2K 04-11-2012 11:26 AM

At least you searched ;)

dirtbikedude2989 04-11-2012 11:50 AM

Ya i searched cuz im getting ready to rebuild my turbo motor so i was trying to figure out if i needed to get new rods for what im looking to run for power

wroark 04-11-2012 03:09 PM

well, it's been brought back from the dead, soooo, I got 25psi on a stock 1.8 (1994).
MBSP is the only addition to the bottom end.
Lot of head work though.
t3/t04e hybrid turbo

Braineack 04-11-2012 03:43 PM

turbo must spool so slow you never make any good torque :)

18psi 04-11-2012 03:55 PM

/\ this.

as long as you can keep the boost coming on progressively and not within a couple hundred rpm you can run surprisingly high pressures on the stock block.

leatherface was running what, 27psi?

wroark 04-11-2012 04:37 PM

well I've built it according to corky bells formula for a maximum effort system. 3000 rpm is soft for sure but at and beyond 4 k it's monsterous. With the head work and mbsp I have raised the rev limiter to 7500 rpm and there is no boost Droop

18psi 04-11-2012 04:38 PM

Nothing wrong with that.

Its just that most folks on here prefer to get maximum torque under curve which is why brain made that comment.

Full_Tilt_Boogie 04-11-2012 04:59 PM

1 Attachment(s)

Originally Posted by dirtbikedude2989 (Post 862576)
On 5psi and running alittle lean i made 127hp at the wheels and the i got 460cc injectors and then i was running 16psi and im pretty sure i was up around 180hp then one of my rods started knocking but the money had like 240xxx on it and a stay 47 hrs of driving on it.

https://www.miataturbo.net/attachmen...ine=1334177955

dirtbikedude2989 04-11-2012 05:11 PM

I took my motor apart today and found that the noise was a piston that was melted due to the injector shorting out and i had the same effect when i was running 16psi, after 4 grand the car turned into and animal lol

elesjuan 04-11-2012 05:54 PM

1 Attachment(s)
https://www.miataturbo.net/attachmen...ine=1334181285

fhdez87 03-20-2013 02:40 AM

hello guys, i changed al metals in my block, polished the head and changed all the seals also the valves, so the engine is completely rebuilt. How many Psi do you think it may hold??

FRT_Fun 03-20-2013 02:50 AM

All of it.

turbofan 03-20-2013 08:54 AM

"How much boost can it handle" without further details is one of the dumbest questions ever. In order to be able to make any sort of estimation we would need to know all the details. You changed all the metals? What kind of rods? What sort of turbo/manifold/exhaust/etc? Engine management? Who is tuning it?

It is known that, on average, stock rods tend to fail somewhere around 250 wtq assuming good tune and such. if the boost comes on hard and soon it is more likely to break than boost onset softer and later.

Braineack 03-20-2013 09:28 AM


Originally Posted by turbofan (Post 991736)
"How much boost can it handle" without further details is one of the dumbest questions ever. In order to be able to make any sort of estimation we would need to know all the details. You changed all the metals? What kind of rods? What sort of turbo/manifold/exhaust/etc? Engine management? Who is tuning it?

It is known that, on average, stock rods tend to fail somewhere around 250 wtq assuming good tune and such. if the boost comes on hard and soon it is more likely to break than boost onset softer and later.



good answer.


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