FMIC pressure loss question

[QuA]

The pressure loss in a FMIC sometimes reaches 1-2 psi depending on the size of the IC. Why is this?

[R_Ethug]

Re: FMIC pressure loss question

more space for the air to fill up

[Stonewall]

Re: FMIC pressure loss question

more space for the air to fill up

...due to the air being more dence.

[QuA]

Re: FMIC pressure loss question

kool. so 18psi is just 18psi... its not like 19-20 and then -1 or -2 the fmic loss.

just wondering if the turbo actually pushes 20psi and then it get reduced after?

[Kor]

Re: FMIC pressure loss question

kool. so 18psi is just 18psi... its not like 19-20 and then -1 or -2 the fmic loss.

just wondering if the turbo actually pushes 20psi and then it get reduced after?

The turbo creates a particular pressure. The air is also heated by the turbo and engine parts, which increases that pressure. However, the increase due to heat is BAD because the air is made less dense. Less oxygen means poorer performance. The intercooler cools the air, reducing the pressure but making it more dense. A FMIC also (as mentioned) has greater volume and therefore you may see a pressure loss as it would take a lot more air to fill that volume to an equal pressure.

In reality, denser cooler air at a lower pressure is far better than hot air at a high pressure. This is why it does not make sense to go above a certain pressure for a given turbo. This is also why you should not be so focused on your boost gauge, since the pressure shown is not related to the speed of the car.

[Tromping_Maniac]

Re: FMIC pressure loss question

Also, wouldn't Mike's constant boost pressure be way over the limits of what our small turbo's can handle, should he be concerned about melting the compressor/turbines etc, etc?

Thanks for the input turbo experts cause I am also looking at doing what Mike did or a turbo upgrade.

Bryce

[QuA]

Re: FMIC pressure loss question

Ahhh wise wisdom daniel san =) hehe. Alot of people say the FMIC is kind of overkill on our small turbo's but its a significant difference when driving with it.
And the nice cold days like this even cool it more =) I was looking at my buddies a4 b6 1.8t and his FMIC is freaking GIGANTIC. When you lift the hood its like from the bumper to the engine in size.

QuA

The turbo creates a particular pressure. The air is also heated by the turbo and engine parts, which increases that pressure. However, the increase due to heat is BAD because the air is made less dense. Less oxygen means poorer performance. The intercooler cools the air, reducing the pressure but making it more dense. A FMIC also (as mentioned) has greater volume and therefore you may see a pressure loss as it would take a lot more air to fill that volume to an equal pressure.

In reality, denser cooler air at a lower pressure is far better than hot air at a high pressure. This is why it does not make sense to go above a certain pressure for a given turbo. This is also why you should not be so focused on your boost gauge, since the pressure shown is not related to the speed of the car.

[R_Ethug]

Re: FMIC pressure loss question

is this guy local.. if so get him to a meet we need more vag cars in the club