How much Boost is safe on a stock engine. - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 12-13-2006, 12:42 PM   #21
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Rules are meant to be broken
How much power were you making back then?
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Old 04-11-2012, 11:40 AM   #22
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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.
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Old 04-11-2012, 11:41 AM   #23
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And i have the 1.6
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Old 04-11-2012, 11:43 AM   #24
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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.
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Old 04-11-2012, 11:54 AM   #25
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he just woke up from a 6 year hibernation don't mind him
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Old 04-11-2012, 12:16 PM   #26
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Lol i was googled how much power the stock motor can handle and found this post and i wasnt paying attention to the dates.
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Old 04-11-2012, 12:26 PM   #27
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At least you searched
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Old 04-11-2012, 12:50 PM   #28
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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
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Old 04-11-2012, 04:09 PM   #29
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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
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Old 04-11-2012, 04:43 PM   #30
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turbo must spool so slow you never make any good torque
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Old 04-11-2012, 04:55 PM   #31
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/\ 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?
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Old 04-11-2012, 05:37 PM   #32
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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
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Old 04-11-2012, 05:38 PM   #33
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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.
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Old 04-11-2012, 05:59 PM   #34
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Quote:
Originally Posted by dirtbikedude2989 View Post
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.
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Old 04-11-2012, 06:11 PM   #35
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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
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Old 04-11-2012, 06:54 PM   #36
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Old 03-20-2013, 03:40 AM   #37
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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??
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Old 03-20-2013, 03:50 AM   #38
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All of it.
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Old 03-20-2013, 09:54 AM   #39
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"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.
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Old 03-20-2013, 10:28 AM   #40
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Quote:
Originally Posted by turbofan View Post
"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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