Originally Posted by Jafro
By injecting the pressurized air back into the compressor housing, when you let your foot off the gas or shift, the released air pressure keeps the turbo spooled instead of slowing it down with the pressure drop. I understand what you're saying about not having a MAF sensor, but DSMers who do have one don't just recirculate it to keep their fuel curves right, they do it to keep the turbo spooled. It makes the turbo not have to work as hard to re-pressurize the IC and pipes when you mash on the gas for the next gear. So basically even without a MAF, it improves throttle response and lessens turbo lag.
Indeed. And I also recommend water injection with the new setup. My roommate runs anywhere from 1-2 bar (usually about 1.3 daily), and his aquamist system made a huge difference. It didn't make a lot of power, but it definitely made some. More importantly, it kept temperatures down and pampered the motor... we did a his head swap after running 1-2 bar for over a year, and the pistons and cylinder walls looked brand new (this is a motor with 200k on it)... can't chalk that up to tuning (he has a hackjob computer and manual boost controller, thats it). I credit the water injection for keeping that motor running strong.