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 Big Turbo And Smaller Turbo Power  

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vk_of_death
  • vk_of_death
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  • Joined: 3-June 03
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  • From: sydney, australia
Post #1 post 9th December 2003 - 11:26 PM
If i had a big turbo and a smaller turbo on exactly identical engines and they were both running exactly 10 pounds would the engines make the same power.

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All you keyboard warriors are just pissed off that the bully used to take your chicken sundwich from you at school..

And yes i am aware i dont know how to use full stops commas or proper grammer.

Monaro getting turboed 2nd time lucky for the v8 turbo recipe
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Amokk
Post #2

nope

the bigger turbo would flow more air so therefor make more hp

but the power curves would be very different

vk_of_death
Post #3

Yeah the big turbo wouldnt have to spin as hard to make the 10 pounds but the amount of air being pushed in is the same

woody
Post #4

no the big turbo would flow more air. would have much better top end. the small turbo would flow less air but have better low to mid range power

Amokk
Post #5

no.. i meant the volume of air

so the bigger turbo would be pushing more air

look at it like this

if u had a 2m pipe and a 10m pipe

and pushed water through them @ 10psi

obviously the 10m pipe would push more water through

so its the same with turbo's

the bigger, the more air it pushed at each psi, which will give u the hp

but obviously there are downside to this

ie lag and so on

woody
Post #6

thats right, hence the different HP ratings for turbos

vk_of_death
Post #7

Oh alright so boost level has nothing to do with the volume of air going in

S15_Clint
Post #8

boost pressure is just the flow rate of the air, the volume however changes, as others have stated.

Pie
Post #9

im confused now but i think i get it!

Post #10

Boost pressure is proportional to the airflow. But 10psi is just max boost, the turbos have to work over a whole range of rpm and boost pressures.

It all depends on the actual size of the turbo to begin with, The is too many factors to say a larger one will flow more than a smaller one.

You need to take into account compressor wheels and internal flow rates.

_______________________________________________________________
Amokk Stated
no.. i meant the volume of air

so the bigger turbo would be pushing more air

look at it like this

if u had a 2m pipe and a 10m pipe

and pushed water through them @ 10psi

obviously the 10m pipe would push more water through

so its the same with turbo's

the bigger, the more air it pushed at each psi, which will give u the hp

but obviously there are downside to this

ie lag and so on
____________________________________________________________

This may be correct if you increase the size of the intake But putting a larger turbo on an already restricted intake would have a negative affect to the power curve.
SHERIF
Post #11

i had a gsr once and went from the standard turbo to a t28bb
the t28 ran 2psi less and made 50kw at the treads more
and it came on quicker and harder
but then i went bigger again and it made even more power but had to wait days for the lag to get ova

JJRB30ET
Post #12

it also depends WHEN this boost is reached..bigger turbo needs more exhaust flow to produce the same pressure level, hence higher RPM..higher RPM for the same torque = higher power.
180GO
Post #13

Just chuck them both on. laugh.gif

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