# Rankins 1.8t DD build

**URL:** <https://forums.speedlife.net/t/rankins-1-8t-dd-build/243192>\
**Category:** Builds\
**Created:** [March 31, 2009, 8:47am UTC](https://forums.speedlife.net/t/rankins-1-8t-dd-build/243192 "2009-03-31T08:47:22Z")\
**Posts on this page:** 1\
**Showing post:** 58

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**Author:** ![1320-20V](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/1320-20v/32/6474_2.png) [@1320-20V](https://forums.speedlife.net/u/1320-20V)\
**Post date:** [April 1, 2009, 3:49pm UTC](https://forums.speedlife.net/t/rankins-1-8t-dd-build/243192/58 "2009-04-01T15:49:21Z")

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> [@I am probably going to hell for this....](https://forums.speedlife.net/t/i-am-probably-going-to-hell-for-this/16531/35):
>
> its all about volumetric efficiency and CFM. luckily youve got an AEB head already… a k03 is not efficient at higher boost levels, they just make loads of torque, and lots of hot air.
> 
> but this guy is an engineering student or something, with a stock car so trust what he says.

You do not understand the difference between flow, and mass flow.

If you were to hook up your manifold to a pressure regulator with unlimited flow, your Hp would be directly proportional to pressure. This is all i am saying.

All of your turbo statements have a lot more involved than just pressure. Obviously bigger turbos make more power.

other variables you are not accounting for.

-heat  
-the area under pressure vs flow graph  
-back pressure  
-turbine acceleration  
-compressor maps  
-turbine efficiency  
-windage losses

It is the combination of those 7 things and more that make your engine perform better than a K03 car.

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