expectations...
Thread Starter
On The Tree
Joined: Apr 2013
Posts: 152
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Plus more cubes= less boost needed which in turn = less stress on motor so it'll be more reliable and last longer
You're totally wrong.
Boost is a measure of what the engine can consume. More cubes, consumes more=less boost. Less cubes, consumes less=more boost.
Less RPM? Have you ever heard of longer cam timing to gain that RPM back?
Please don't argue this point as you're incorrect.
Just an example so you understand this:
Class we race in, has many cars and engine sizes using the same exact turbo, turbine wheel and AR housing. The BWS476 T6 1.32 96mm turbine unit. One competitor has a 427, he makes 16-17psi. Another competitor has a 370, he makes 22-24psi. Another competitor has a 325 c.i. 5.3, he makes 27-28psi.
These cars are running as much boost as they possibly can and are not holding anything back. Now tell me why the larger engine has a lower boost reading? It in fact does not make less boost, it just has a larger engine which is consuming more of it so less pressure is left in the intake manifold where boost is measured.
Boost is a measure of what the engine can consume. More cubes, consumes more=less boost. Less cubes, consumes less=more boost.
Less RPM? Have you ever heard of longer cam timing to gain that RPM back?
Please don't argue this point as you're incorrect.
Just an example so you understand this:
Class we race in, has many cars and engine sizes using the same exact turbo, turbine wheel and AR housing. The BWS476 T6 1.32 96mm turbine unit. One competitor has a 427, he makes 16-17psi. Another competitor has a 370, he makes 22-24psi. Another competitor has a 325 c.i. 5.3, he makes 27-28psi.
These cars are running as much boost as they possibly can and are not holding anything back. Now tell me why the larger engine has a lower boost reading? It in fact does not make less boost, it just has a larger engine which is consuming more of it so less pressure is left in the intake manifold where boost is measured.
Last edited by Sales@Tick; Jun 4, 2013 at 12:48 PM.
Lol the fact that you're even saying that a larger engine won't have a greater amount of ve than a smaller engine shows you have not one earthly clue what you're talking about. Greater cylinder fill is why the larger engine will have a higher ve given the same camshaft, heads and intake are being used. Of course you can have some pro stock engine that has a higher ve than a larger cube motor than it, but pro stock engines are not being discussed here.
I would professionally ask you to stop embarrassing yourself right now as you are totally out in left field on this.
80mm compressor 96mm turbine.
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I'm really trying to be polite and educate this gentleman, but it is quite elementary. I never thought someone would argue pump gas is better than E85 either.....
. 93+meth for me... You prefer 100% or a mixutre? PM if youd like. dont wanna hijack 
TECH Regular
Joined: Nov 2007
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OK, so if all of those engines were using the exact same combination, besides displacement obviously, how different would the boost levels be? I'm not saying they'll be 100% identical, I just don't think they would have a 10psi spread like you mentioned earlier in the thread. There's no way it's that big a difference.
TECH Regular
Joined: Oct 2012
Posts: 476
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OK, so if all of those engines were using the exact same combination, besides displacement obviously, how different would the boost levels be? I'm not saying they'll be 100% identical, I just don't think they would have a 10psi spread like you mentioned earlier in the thread. There's no way it's that big a difference.
Thread Starter
On The Tree
Joined: Apr 2013
Posts: 152
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Thread Starter
On The Tree
Joined: Apr 2013
Posts: 152
Likes: 0
Teching In
Joined: Feb 2013
Posts: 35
Likes: 0
From: Huntingtown, Maryland
Its all about the tuning.. You can build a fully built motor but without the correct tune you can cause detonation. Im doing a stock LQ4 6.0 short block with Minor engine mods and going to try to squeeze 750rwhp out of it with about 10-15 psi of boost. With the correct tune I should be able to do this. Same with you.. I know guys running tons of hp of those stock iron block 5.3's but those tunes on em are perfect. So best of luck to whatever you choose!
OK, so if all of those engines were using the exact same combination, besides displacement obviously, how different would the boost levels be? I'm not saying they'll be 100% identical, I just don't think they would have a 10psi spread like you mentioned earlier in the thread. There's no way it's that big a difference.
I can answer that for John as I don't think Ott308 has ever had his car on the dyno. He races it a lot.