How much Boost is safe on a stock engine. - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 03-20-2013, 11:04 AM   #41
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I recommend you just weld your wastegate shut, that way you won't ***** out.
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Old 03-20-2013, 11:08 AM   #42
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Quote:
Originally Posted by fhdez87 View Post
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??
With the rebuilt motor you can run 23.4568psi. If you accidentally run 24psi, even for a moment the welds on your intake manifold will come apart.
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Old 03-20-2013, 11:10 AM   #43
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what if he reinforces the welds though? I'm guessing 24.69psi is ENTIRELY possible, though it hasn't been tested by Paul Walker
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Old 03-20-2013, 11:19 AM   #44
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what if he reinforces the welds though? I'm guessing 24.69psi is ENTIRELY possible, though it hasn't been tested by Paul Walker
Well it will come down to if he uses 2 of the big bottles of NOS or not.
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Old 03-20-2013, 04:53 PM   #45
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Dual NOS bottles should only be used when compound charging, one before each compressor wheel. Bonus - when you're compound charging, you get four times the boost instead of twice the boost!
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Old 03-20-2013, 05:44 PM   #46
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Quote:
Originally Posted by 18psi View Post
what if he reinforces the welds though?
He'll be fine, so long as he double-clutches. Granny-shifting is what blows welds.
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Old 03-20-2013, 06:00 PM   #47
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most def

and make sure to scream MONIKAAAAAA
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Old 03-20-2013, 06:04 PM   #48
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30psi on a GT1241...

Or

4psi on a gt4708.
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Old 03-22-2013, 02:54 PM   #49
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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.
Stock rods and stock pistons. I replaced all bearings, and the turbo is T25/T28 Turbocharger, stock manifold and Stainless Steel Catback Exhaust System.
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Old 03-22-2013, 03:04 PM   #50
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You put new bearings in but kept the stock rods?

Banned for trolling.
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Old 03-22-2013, 03:39 PM   #51
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i didnt replaced rods because my main point wasnt based on Turbo. My engine was suffering of low compression in 3 and 4, so i replaced piston rings and bearings (I have pictures of the complete work).
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Old 03-22-2013, 03:48 PM   #52
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That sucks for you. Now start reading and let this 7-year old cancer-infested thread die already.
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Old 03-25-2013, 12:29 PM   #53
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I just threw in some h-beam rods, im sure it will be good for 350hp, which is my final goal.
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Old 03-26-2013, 08:10 AM   #54
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Should be fine for a street car. For track use you'll need stronger oil pump and other stuff.
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Old 03-26-2013, 01:43 PM   #55
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isnt the stock 1.6 can handle around 250hp with stock internals??

It not right to ask how many PSi a engine can handle but how much stress it can handle
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Old 03-26-2013, 01:46 PM   #56
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Attached Thumbnails
How much Boost is safe on a stock engine.-4hx1ioq.jpg  
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Old 03-26-2013, 01:46 PM   #57
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torque [and clyinder pressure] bends rods.
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Old 01-26-2016, 02:44 AM   #58
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Question boost

Quote:
Originally Posted by ak47bravo View Post
From what I have seen and read 12 psi is completely fine on a stock engine and really if you want anymore power you have to get forged pistons and rods. Can a stock engine handle like 15 psi? If it can how well can it handle it. If you run 8 or 12 psi usually then boost up to 15 sometimes would it hurt?

what about no tune. what boost pressure can i run with no tune till i get ecu ?
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Old 01-26-2016, 03:09 AM   #59
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First post. In a thread that was bumped in 2012 from 2006. 4 years later in 2016.


Must be a helluva hibernation chamber.
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Old 01-26-2016, 04:00 AM   #60
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Quote:
Originally Posted by pinkbunnyballz View Post
what about no tune. what boost pressure can i run with no tune till i get ecu ?
None.
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