Boost question as it relates to cubic inches.....
Boost question as it relates to cubic inches..... The 454ci LSX that uses the 2300 SC'er makes 840 HP.
This engine:
If that SC'er was removed and dropped onto a 370ci engine.......same compression as the 454ci......same exact car otherwise.
Would it make more power at the same psi output?
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This engine:
If that SC'er was removed and dropped onto a 370ci engine.......same compression as the 454ci......same exact car otherwise.
Would it make more power at the same psi output?
.
Last edited by LS6427; Nov 5, 2016 at 11:42 AM.
Its obviously true.......I'm just curious why people are saying that I should of built a smaller cube engine than my 390ci so I can make more power with a given size single turbo.
I plan to use the biggest baddest T4 flanged mid frame turbo, which people say is the S484. But why will it make more power on a 366ci than on my 390ci...?
Why are people saying I should have built a smaller cubed engine for boost...?
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There's nothing I can do now...my 390ci is in my car.......
I was hoping to make 1,200 RWHP through my 4L80E........T4 flange, mid frame.
I have 2 weeks to choose a turbo. It also must fit the Huron Speed V2 A/C single turbo kit.
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I was hoping to make 1,200 RWHP through my 4L80E........T4 flange, mid frame.
I have 2 weeks to choose a turbo. It also must fit the Huron Speed V2 A/C single turbo kit.
.
Its just odd that the 454ci is only on 7psi and its only about 400 HP away from my 1,200 RWHP goal. But with my 390ci I will need to run 19psi to make near 1,200 RWHP.......maybe 20-21psi.
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Staging Lane
Joined: Mar 2007
Posts: 55
Likes: 0
The reasoning they say your engine is too big is the added exhaust flow of the larger engine will cause back pressure issues that will cause it to run out of steam earlier than that same turbo would on a smaller engine.
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9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
All aspects of the build needs matched.
Say a GT3076 might make a very usable 600hp on a 2.0 4 cyl motor.
But that same GT30 on a 6.0 and it would be *****. Well..it might feel good from 1-3000rpm lol
Say a GT3076 might make a very usable 600hp on a 2.0 4 cyl motor.
But that same GT30 on a 6.0 and it would be *****. Well..it might feel good from 1-3000rpm lol
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9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
If you want a bigger motor then just go for the bugger motor...it's always easy to bolt on a bigger turbo later.
It may not be much, it just depends where it may push the compressor etc on/off it's efficiency map etc But your original question was comparing a 454 to a 370. That is a huge difference
If you want a bigger motor then just go for the bugger motor...it's always easy to bolt on a bigger turbo later.
If you want a bigger motor then just go for the bugger motor...it's always easy to bolt on a bigger turbo later.
This is where people are saying I would make more power if I had a stock cubed or a 370ci engine........
I was trying like hell to persuade Modular Turbo/CBR to make me one of their Twin Turbo kits.......but they can't.
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9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
In general...bigger engines make power power. That really is a general rule.
But...a smaller motor might allow you to make more efficient use of the turbo....and another but, it will also require more boost to do so.
I've said it countless times, don't be afraid of boost, boost isnt a killer...but of course the engine package needs to be capable of running that boost. If fuel/CR etc allow it, wind then yes there is a chance that the smaller motor might get better results. But when there are so many variables elsewhere, there is no simple answer.
You could have a 390 with shitty heads and cam that will make less power everywhere than a 370 with a great head/cam package. So it's not all about engine size, it's very much about airflow.
But...a smaller motor might allow you to make more efficient use of the turbo....and another but, it will also require more boost to do so.
I've said it countless times, don't be afraid of boost, boost isnt a killer...but of course the engine package needs to be capable of running that boost. If fuel/CR etc allow it, wind then yes there is a chance that the smaller motor might get better results. But when there are so many variables elsewhere, there is no simple answer.
You could have a 390 with shitty heads and cam that will make less power everywhere than a 370 with a great head/cam package. So it's not all about engine size, it's very much about airflow.
In general...bigger engines make power power. That really is a general rule.
But...a smaller motor might allow you to make more efficient use of the turbo....and another but, it will also require more boost to do so.
I've said it countless times, don't be afraid of boost, boost isnt a killer...but of course the engine package needs to be capable of running that boost. If fuel/CR etc allow it, wind then yes there is a chance that the smaller motor might get better results. But when there are so many variables elsewhere, there is no simple answer.
You could have a 390 with shitty heads and cam that will make less power everywhere than a 370 with a great head/cam package. So it's not all about engine size, it's very much about airflow.
But...a smaller motor might allow you to make more efficient use of the turbo....and another but, it will also require more boost to do so.
I've said it countless times, don't be afraid of boost, boost isnt a killer...but of course the engine package needs to be capable of running that boost. If fuel/CR etc allow it, wind then yes there is a chance that the smaller motor might get better results. But when there are so many variables elsewhere, there is no simple answer.
You could have a 390 with shitty heads and cam that will make less power everywhere than a 370 with a great head/cam package. So it's not all about engine size, it's very much about airflow.
Also, I'm going to see what it makes with my terrible 1998 LS1 ported heads that only flow 304 cfm@ .600.
Then maybe I'll get new heads that flow much better to see what gains I can get.
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Restricted User
Joined: Mar 2014
Posts: 7,192
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From: Ohio
The 840 or whatever they rate that at is flywheel hp, not WHP. Its closer to 700 at the wheels, not 840.
Its about efficiency of the turbo. The smaller c.i. of the motor would put you in a more efficient area of a given turbo. That large of a c.i. motor and I would be running a T6 turbo, not a T4.
Or my 390ci?
Nobody builds a single turbo kit that retains A/C that fits a T6 turbo....A/C is a must for my car. So Huron Speed makes a T4 mid frame turbo kit which is what I have......
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Last edited by LS6427; Nov 7, 2016 at 06:34 PM.