SameerP

When a turbo is made to operate outside of its optimal range (like a KO3 above 5500rpm) it creates more heat than normal...and this heat; 1) robs power and 2) shortens turbo life. However, a FMIC will provide significantly superior cooling to the turbo.

Does this additional cooling offset (negate) the additional extra heat and provide the additional boost (granted it may be marginal improvements at best) or does the FMIC cool enough merely to keep the turbo operating at peak effeciency within it's intended boost range?

Cheers

RKA

The turbo gets hot when it's running. Some of that heat is transferred to the air the turbo is pushing into the engine. Hot air in the engine is no good (power loss). Enter the intercooler...cooling the air before it enters the intake manifold. The FMIC doesn't really do much for the turbo itself.

The K03 can only spin so fast...so the ECU will taper boost over 5500 rpms to keep the K03 from overspinning. Excess heat may also play a role behind the reasoning to taper boost.

curyfury

FMIC is used to cool the compressed air going into the intake manifold. I'm pretty sure it has no part in cooling the turbo itself. Only oil/coolant and ambient air will cool the turbo.

CMH

gets cold air all the time or you can spray nos into the intake after the MAF but before the turbo.

1heartaudiworld

Most FMICs, and any larger IC have a greater pressure drop. For early cars with no MAP sensor this will only make you lose boost, the cooler air may make up for the power, but you will run less boost. On cars with MAPs sensors the car will see it is making less boost after the IC then it is supposed to and adjust the wastegate controls accordingly to bring the boost levels up to what they should be. So say our turbo needs to make 17psi to get 15psi at the manifold. Add in a IC with a 2psi pressure drop over stock and you will have to then make 19psi to get 15psi. This sort of makes you work backwards.


As for air/liquid ICs. You dont' need to put one before the turbo to make the turbo work cooler. The stock IC has a pressure drop that s not great but can be improved on.. Just by shortening the length of the rows of the IC you can decrease the pressure drop. With an air/liquid IC the water makes up most of the mass of the IC, it takes away the heat in the air not te metal fins of a normal air/air IC. WAter also does this mroe effciently then metal does and does it at low speeds. So with an air/liquid IC you can decresae pressure drop and they work more effciently so your turbo has to work less to make the same boost, which also decreases temps. With a real effcient setup you would probably evne be able to up the boost over a standard chip for a simlar setup with a stock IC or FMIC.

chris
chris86vw@aol

WYSIWYG

<center><img src="http://wsphotofews.excite.com/018/ew/WM/yw/mZ89667.jpg"></center><p>
=)

SameerP

heh i love Liam's sig with the "Feed Me" line under his car sans light