New to turbo! how do I get 25 psi on boost?

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90c-rex

New Member
Ok here's what I've got plan I've got a 90 crx si and wanted to do a fully built ls turbo and wanted to get 25 pounds of boost( if I can??? Or At least get the highest it can handle) and my bottom setup is gonna be port polish ls block, deck and honed, sleeved with darton sleeve, bore 84 or 85mm with arias turbo pistons with eagle rod and crank, head build will be port and polish 3 angle valve job, skunk2 titanium retainer and dual valve spring, High performance valves, skunk2 adjustable camgears, and cams, 55cc or 660 injectors with ngk iradium sparkplugs, Ls tranny, skunk2 intake manifold with skunk2 throttle body and hasport mount with a etd traction bar and megan racing suspensions, and a rear c pillar tie bar...and maybe a 60 trim garret turbo....someone tell me what kind of numbers they think imma be gettin for this setup and how much hp I will be making with What kind of boost as in psi and how do I bump up my psi for my turbo boost???? sorry all the nonsense because im new to turbochargin. please leave your opinion or pm me!! any help will be appreciated?
 
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new to turbos + 25Psi = Kabooommm!!!!

seriously take it easy until you are more familiar with the system, or you will loose your engine.
 
Is this your first time working with a forced induction set-up? And you're just going all-out one your first try?

How about you learn about tuning before you go an turn up the boost.
 
lol Blanco do you ever get tired of telling people that exact same sentence: PSI is completely irrelevant until you pick a turbo. Too many people get on here asking about PSI and know jack shit about FI and want to run X PSI.
 
psi does not = pwer.

a t66 with 10 psi is a world away from a t3/t4 with 10 psi.
 
But in all seriousness, this kid is a retard if he thinks he is going to boost 25psi. Did he magically pull that number out of his ass?
 
I don't think he understands the kind of power he'll get from 25 psi, and maybe he could run 25 psi with his build but I don't think he knows how to tune since he's asking so many questions. I'd say he should just bolt-on a kit with a t3/t4 and keep it safe at 7 psi.

I think that's true that psi is psi from any turbo, it's just the pressure but I'm not sure, Blanco the Honda God can explain better.
 
I just want to know where I can get a port and polished LS block? But seriously, you WILL waste money if you try and go all out on your first shot. If you still have the D-series in your CRX, start by boosting that. Worst case scenario, it blows. You were going to replace it anyway.
 
I researched for a year before I went FI. Do your homework.
 
blanco, you should do a "read this before posting an "i want to do a turbo"' thread with the theories of boost. 25psi... not that i know anything :)
 
Blanco said:
A large turbo pushes a higher volume of air at 10psi than a small turbo does. Thats why you have to run a smaller turbo at higher boost levels to reach the same power as a larger turbo.
Click to expand...

Thanks for clearing that up I thought the same, that psi was psi regardless and that you just needed a turbo big enough to put out the psi you need to reach the power you want. I still got a lot of my own researching to do, I don't know what CFM means but that it's relevent to boost, or even how to tune with software and a chip :). My first turbo will go on my d15b so it's only a $400 block if it blows. Then I'll move on to a built b16 turbo project :D.

To the original poster, and to stay on topic: Just throw on a bolt-on kit.
 
uh 93civic racer... take a look at the principles of a twin scroll turbo. i rode in an opel vectra with a twin scroll turbo and i could not believe the amount of torque (it was a v6 though) but more impressive was the lack of laggg... plenty of torque down low. the basic idea is that there are two inlet ports on the turbo, separating the four cylinder exhaust ports into these two ports... i won't attempt to explain more but if i were to do a turbo build i would probably hunt for a twin scroll type... :)
 
Blanco said:
A large turbo pushes a higher volume of air at 10psi than a small turbo does. Thats why you have to run a smaller turbo at higher boost levels to reach the same power as a larger turbo.
Click to expand...

This statement doesn't make sense to me. If it were a larger volume of air per measurement of time there would be more pressure applied. Disregarding spool times, and parasitic loss, I believe 10psi is 10psi no matter what means of forced induction.
 
If you fill a 20 oz pop bottle with 10 psi of pressure, and do the same 10 psi to a 2 liter bottle, then puncture both, which one will put out more air and make a bigger boom? The bigger bottle duh! That same principal goes for turbo's.
 
The world needs to start measuring the output of a turbo in terms of mass flow rate, not psi.
 
Duh... Yeah I think we are using the wrong terminology here. I think a bigger turbo would only keep the pressure at 10psi when the engine consumes more air volume than a smaller turbo could produce. If you look at it this way, in this situation we have 2 variables the amount of air a turbo can produce at any given rpm and the amount the engine can consume at any given rpm. Unless the engine can consume more than the turbo the pressure will be at 10psi, any extra air volume will be exhausted through the use of a blow off valve or waste gate set at that same 10psi. If a larger turbo tries to compress more air you get more pounds per square inch. So again how does a bigger turbo push a higher volume of air at 10psi than a smaller one? I can see that maybe its more efficient thus giving a little extra power at the psi level but I can't see how it pushes more "volume".
 
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