B18 Turbo - Forced Induction
Are you considering a B18 Turbo? If you have a B18C1 or a B18C5, you must
be wondering how we ever get around in these torqueless wonders.
This webpage is geared towards newbies to forced inducion like me. So, if there is
anything I say is wrong, let me know and I'll correct
What is a turbo?
If you remember Knight Rider from the old days, you may remember that thing called turbo
boost. Having a B18 turbo car won't make it fly into the air, but it will
make it feel like you are taking off in an airplane.
A turbo actually
consists of a turbine and
compressor connected together by a shaft. Inside each unit is an impeller - a bladed wheel that either catches, or moves the
air. The turbine is connected to the engine's
exhaust manifold and is driven by the engine's exhaust gases. The compressor is connected inline to the engine's intake and compreses the intake
charge. For simplicity sake, we'll call them the turbine and the
compressor. Remember, the two are connected by a shaft so the compressor will rotate at the
same speed as the turbine driven by the exhaust gases. These things spin extremely fast!
Because the compressor is connected to the turbine and is spinning
extremely fast, it will essentially cram air into the engine. Thus you get forced induction - a
hella-of-alot of crammed air into your cylinders. Depending on your turbo setup, you may be boosting anywhere
from 1 psi to 30 psi or more.
Is boosting the same in a small turbo setup compared to a larger turbo
The short answer is no.
Atmospheric pressure is approximately 14.7 psi. Think about it as 14.7 pounds of air
sitting on 1 square inch. Another unit of pressure is a bar. 1 bar is
approximately equal to 14.5 psi. So what the heck does this mean to you? It means that if you are boosting to
30 psi, you are boosting to almost 2 bars. Does that mean you are cramming 30 pounds of air into your
engine? No way.
Here's an example why. Stick a driinking straw in your mouth and exhale as hard as you
can. No so hard, right? Now stick a coffee stirrer straw in your mouth and exhale as hard as you can.
You have to exert a tremendouse amount of pressure to get the same amount of air to go through that
So, what have you learned? A smaller B18 turbo setup will not be able to cram
as much air into your engine as a larger 18 turbo setup. If you can cram in more air into the cylinders,
you'll be able to add more fuel. More fuel + more air + spark = more power.
View my AFI Stage 1 GT kit
Return from B18 Turbo to
Integra Type R