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I like to keep things mostly stock on my '11 GS and also wasn't interested in spending big money on a aftermarket CAI system. So I went with this simple shroud that keeps cool air on the filter side and hot air in the engine bay area. I drilled 5 holes (1.75dia) in the lower part of the fan shroud to allow max cool air to reach the intake. Pretty slick IMO.
Got your shroud but no holes, ya think they make a difference Dennis??
Bobby
It's difficult to know. Some folks have questioned whether the front scoop provides enough airflow at WOT. So before installing the new shroud I decided to provide a path for additional airflow.
The wedge bolts trick works a lot better,since if you drill too many holes, have too much outside air coming in, can end up with surging problems.
Hence if you did wedge the shroud open to much and get surging problems, then you just make the wedge gap smaller instead. With drilling holes, would need to start filling/plating some of the hole back closed until you solve the surging problem isntead.
The wedge bolts trick works a lot better,since if you drill too many holes, have too much outside air coming in, can end up with surging problems.
Hence if you did wedge the shroud open to much and get surging problems, then you just make the wedge gap smaller instead. With drilling holes, would need to start filling/plating some of the hole back closed until you solve the surging problem isntead.
Vaild point .... but I have no surge problem. And if I did, I could easily cover the holes with a flat piece of plastic or some cap plugs I found on Amazon.
09-14-2018, 02:10 PM
CAI On A Budget
