Twin Turbos.....

[The Red Ranger]

So I know basics about turbo chargers, but I am curious if someone can help me out with diagrams, or pictures, or a how to on how to build a twin turbo for model kits.

[pharr7226]

Take a look at this

http://www.bankspower.com/videos/show/88-t...ngines-and-kits

[BigGary]

The Monogram 1/24 '56 Chevy has a SBC with twin turbos. Both turbos blow into a single tube and into the carb. I have this kit to trade.

Gary

[The Red Ranger]

Wow pharr thank you a lot!

as far as the 56 chevy, sounds intriguing but I think I'm going to hand build it.

[The Red Ranger]

How do intercoolers fit into the mix? can you use intercoolers on a twin turbo setup cause I know they are used on some or most regular turbo setups.

[diymirage]

How do intercoolers fit into the mix? can you use intercoolers on a twin turbo setup cause I know they are used on some or most regular turbo setups.

the idea is simple

when you compress anything you create heat

on top of that the turbo is driven by hot exhaust gasses

so you have cold air going through a hot turbo and being compressed

the result is hot air (regardless of the amount of turbos it passes through)

now, here is the main issue, you are building a twin turbo, not a bi-turbo right ?

that means you have two identical turbos, one per bank

so here is the intake path

air filter -> turbo

turbo -> intercooler

intercooler -> intake manifold or throtle body

so in short, your awnser is YES, put a intercooler between the turbos output and the engines intake

[The Red Ranger]

the idea is simple

when you compress anything you create heat

on top of that the turbo is driven by hot exhaust gasses

so you have cold air going through a hot turbo and being compressed

the result is hot air (regardless of the amount of turbos it passes through)

now, here is the main issue, you are building a twin turbo, not a bi-turbo right ?

that means you have two identical turbos, one per bank

so here is the intake path

air filter -> turbo

turbo -> intercooler

intercooler -> intake manifold or throtle body

so in short, your awnser is YES, put a intercooler between the turbos output and the engines intake

Doesn't bi-turbo mean the same thing though? if not what is the difference cause google search only said they are the same thing.

[diymirage]

Doesn't bi-turbo mean the same thing though? if not what is the difference cause google search only said they are the same thing.

most of the times a bi-turbo setup will consist of a inline engine (as mentioned by the red ranger) with two turbos

HOWEVER

the two turbos on a bi-turbo engine are NOT identical

you see, smaller turbos creat less boost then larger turbos

but smaller turbos create boost sooner then larger turbos

and vice versa

so here is a hypothetical setup on a bi turbo

lets say were using a volkwagen K03 and K04 turbo

the K03 starts making power at about 2700 RPM and will push 17 PSI through about 4000 RMP and taper down after them

the K04 starts making power at about 3800 RPM and will push 23 PSI through redline

so the smaller turbo is effective at lower RMP but looses efficiency after 4000 RPM

the larger turbo makes great power on higher RPM range but has terrible boost lag since it doenst kick un untill 3800 RPM

by installing both of them on a single engine you can get the of the line performance of the K03 with the top end power of the K04

cliff notes : a twin turbo uses identical turbos, one for each bank

a bi-turbo uses two different turbos on one bank of cylinders

[The Red Ranger]

most of the times a bi-turbo setup will consist of a inline engine (as mentioned by the red ranger) with two turbos

HOWEVER

the two turbos on a bi-turbo engine are NOT identical

you see, smaller turbos creat less boost then larger turbos

but smaller turbos create boost sooner then larger turbos

and vice versa

so here is a hypothetical setup on a bi turbo

lets say were using a volkwagen K03 and K04 turbo

the K03 starts making power at about 2700 RPM and will push 17 PSI through about 4000 RMP and taper down after them

the K04 starts making power at about 3800 RPM and will push 23 PSI through redline

so the smaller turbo is effective at lower RMP but looses efficiency after 4000 RPM

the larger turbo makes great power on higher RPM range but has terrible boost lag since it doenst kick un untill 3800 RPM

by installing both of them on a single engine you can get the of the line performance of the K03 with the top end power of the K04

cliff notes : a twin turbo uses identical turbos, one for each bank

a bi-turbo uses two different turbos on one bank of cylinders

So what if you have a V engine, could you theoretically take the Bi-turbo concept and apply it, creating essentially a quad-turbo? I'm assuming room to fit this becomes an issue, but phew thatd be interesting.

[diymirage]

So what if you have a V engine, could you theoretically take the Bi-turbo concept and apply it, creating essentially a quad-turbo? I'm assuming room to fit this becomes an issue, but phew thatd be interesting.

im sure you could

however

it seems like when car manufactures want to go this route the apply the principle of "compound boost"

usually a turbo blowing into a superchager

but i digest

yes, you could build a quad turbo V engine

as long as you have a bi-turbo setup on both banks