Originally Posted by
MattMPS3
Picking on me again Jmac....definitely worth doing, the benefits have been pretty much covered but as a recap, with my thoughts
-Cooler charge temps, less chance of knock, more dense air entering cylinders, ECU will naturally add more timing to take advantage of this.
-Lower pressure drop across the core, the turbo doesnt have to push as hard to meet its boost targets, yes Jmac the stock IC has a 4psi drop, most aftermarket units will only have a 2 psi drop.
On the stock core + Xede tuned to 18.5psi, the turbo is boosting to 22.5 psi, which is pretty much at the end of its efficiency range, i.e blowing a lot of hot air.
The body of the turbo will also be cooler as a result of the reduced pressure, resulting in lower coolant & oil temps, probably only marginal though.
-Power, not so much an improvement in peak power, but you will notice a more consistent and reliable power delivery, and the turbo will spool quicker thanks to the reduction in core pressure drop, power will also stay on longer up top.
As an example, I found after fitting the FMIC that the car would not struggle to achieve its 15.7 target boost, in fact the opposite occurred it would boost up to about 16.5 psi and hover between 16-16.5.
OK now for the negatives, there are some:
-Boost spikes, the turbo isnt working as hard, so it will spike more than with the stock IC. Spikes arent really worth losing too much sleep over, unless you regularly spike over 30 psi.
-Heatsoak, the ETS will soak as badly as any other TMIC (the bane of the MPS), it will dissipate the heat much quicker though.