What kind of boost can my engine handle?

I look at everyone saying that if you were to get a turbo to set it at 8 psi max...does this only apply to the 6th gens or is 8 psi also max for a 7th gen engine (k24)?

it's a max on almost all automatic equipped cars

i see, and how much horsepower gain do you get out of 8 psi?

i think it depends on a lot of things like the turbo itself, the motor, etc..
I'm not very knowledge when it comes to turbo so lets just wait until some more people can chime in haha

It does depend a lot on the motor and turbo. A lower flow turbo is going to get you less of an increase than a higher flow even at the same boost. Also turbo's of any size don't get you a specific horsepower number. THe same turbo on two different engines will get different horsepower. Turbo's can be more accurately gauged a s a percentage power increase. SUch as a particular turbo might give you a 50% power increase. So that turbo in a smaller engine will give less hp increase number wise than that same turbo in a larger engine.

8 psi is typically safe for stock internals.  Engines with "special" sleeves like the H22's FRM's or the K and F's cast iron can handle much more! 

To add to Shadow's post, a K20 motor with 18 psi will typically put out around 450 HP.  Shadow, do you have a block guard in there?  Stock sleeves?

quote:

ORIGINAL: falkore24

8 psi is typically safe for stock internals.  Engines with "special" sleeves like the H22's FRM's or the K and F's cast iron can handle much more! 

To add to Shadow's post, a K20 motor with 18 psi will typically put out around 450 HP.  Shadow, do you have a block guard in there?  Stock sleeves?

 
FRM sleeves suck, there is nothing special or great about them. Ductile Iron sleeves like those found in almost all the F series engines are the strongest. In the long run though it doesnt matter how strong the sleeves are, the piston rings will give out long before the sleeves will.
 
If he has a 2.5L H22...and that much HP...he does not have stock sleeves. More than likely its a closed deck H22 so he doesnt neet a block guard.

H22 was closed?  If the rings are going to give out first, why do FRM's suck?  Please post max HP from either to back your assertions.  I know a bit about the K's and that the F's have the cast sleeves.

I'm looking for fact here, not opinion.

quote:

ORIGINAL: falkore24

H22 was closed?  If the rings are going to give out first, why do FRM's suck?  Please post max HP from either to back your assertions.  I know a bit about the K's and that the F's have the cast sleeves.

I'm looking for fact here, not opinion.

 
For certain years H22's were closed deck, meaning you could not see around the cylinder walls when you pulled the head off the block. The newer (later) years were open deck, so when you pulled the head off you could see the coolant around the cylinder walls.  FRM sleeves suck b/c you can't bore them out, aren't compatible with forged pistons, if the sleeves are able to be honed it takes a different process than iron sleeves. H22's are high compression motors, boosting them in the first place is not a good idea.
 
What good is posting max HP going to do?

I think max hp would be a debatable topic anyways........

I'm wondering what the sleeves can handle.  From what I've read, the consensous (sp?) for a K20 is that the bottom end can do 450 HP without a problem.  With all of the H22's out there, I'd expect a comparison # wouldn't be that hard to find.  True low comp is best to boost, but that doesn't stop a gearhead with an H22 in the garage!   I've simply never done the research on an H22, but I figure that Shadow has.

seeing that shadow's turbo is at 24 psi, it really comes down to the money you can spend...if i spent enough money, i could beef up my engine and tranny enough and i could get my accord to 450hp i pressume?

My H22 is a closed deck version. Came from a 94 Prelude. I had my sleeves custom made by AEBS. 24psi is the max i've had the turbo set. But usually it's set to 16psi. Since the engine was overbored when I put in the stroker kit, I used 8.4 compression pistons from Arias.
 
The reason FRM isn't good, is because instead of being solid metal, it's a fibrous material. So they can't be bored and the solid materail forged pistons are made from will grind away at the lining.

quote:

ORIGINAL: Shadow1992

My H22 is a closed deck version. Came from a 94 Prelude. I had my sleeves custom made by AEBS. 24psi is the max i've had the turbo set. But usually it's set to 16psi. Since the engine was overbored when I put in the stroker kit, I used 8.4 compression pistons from Arias.

The reason FRM isn't good, is because instead of being solid metal, it's a fibrous material. So they can't be bored and the solid materail forged pistons are made from will grind away at the lining.

 
   

Thank you Shadow.  That is the info that I was looking for, only why wouldn't stock bore cast pistons work?  What are the stock pistons made of if smooth metal destroys the sleeves?

Cast like most other stock pistons.....  the reason the sleeves get destroyed is because of forged pistons,   forged expands far more then cast does, basically any piston that expands enough will destroy frm sleeves

ISnt FRM good for high reving engine, i heard they cuase less friction.

hence why its in the h22 n/a's otherwise you see people who boost it and A destroy the engine because of too much boost, or B resleeve the block with cast iron sleeves