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How much Boost is safe on a stock engine.

Old Mar 20, 2013 | 10:04 AM
  #41  
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I recommend you just weld your wastegate shut, that way you won't ***** out.
Old Mar 20, 2013 | 10:08 AM
  #42  
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Originally Posted by fhdez87
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.
Old Mar 20, 2013 | 10:10 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
Old Mar 20, 2013 | 10:19 AM
  #44  
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Originally Posted by 18psi
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.
Old Mar 20, 2013 | 03:53 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!
Old Mar 20, 2013 | 04:44 PM
  #46  
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Originally Posted by 18psi
what if he reinforces the welds though?
He'll be fine, so long as he double-clutches. Granny-shifting is what blows welds.
Old Mar 20, 2013 | 05:00 PM
  #47  
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most def

and make sure to scream MONIKAAAAAA
Old Mar 20, 2013 | 05:04 PM
  #48  
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30psi on a GT1241...

Or

4psi on a gt4708.
Old Mar 22, 2013 | 01:54 PM
  #49  
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Originally Posted by turbofan
"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 Mar 22, 2013 | 02:04 PM
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You put new bearings in but kept the stock rods?

Banned for trolling.
Old Mar 22, 2013 | 02:39 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).
Old Mar 22, 2013 | 02:48 PM
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That sucks for you. Now start reading and let this 7-year old cancer-infested thread die already.
Old Mar 25, 2013 | 11:29 AM
  #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 Mar 26, 2013 | 07:10 AM
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Should be fine for a street car. For track use you'll need stronger oil pump and other stuff.
Old Mar 26, 2013 | 12:43 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
Old Mar 26, 2013 | 12:46 PM
  #56  
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Attached Thumbnails How much Boost is safe on a stock engine.-4hx1ioq.jpg  
Old Mar 26, 2013 | 12:46 PM
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torque [and clyinder pressure] bends rods.
Old Jan 26, 2016 | 01:44 AM
  #58  
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Question boost

Originally Posted by ak47bravo
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 Jan 26, 2016 | 02:09 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.
Old Jan 26, 2016 | 03:00 AM
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Originally Posted by pinkbunnyballz
what about no tune. what boost pressure can i run with no tune till i get ecu ?
None.

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