Has anyone done this http://www.scoobymods.com/forums/showthread.php?t=3688&highlight=bypass What are your conclusions ?
yes pic is non turbo but i think our car has similar throttle body that has that line running through it. Some say as much as 20+ deg air drop (i dont believe that much). temp drop is a very good thing for turbo cars.
any scientific facts that it works or dont ? Why would it not work. why would you want to heat up the throttle body if you dont see extreme cold temps ? Although the air is gushing through it when its boosting but if the TB is heated then there is some heat exchange involve. There are people claiming 20+deg temp diff (I think thats BS) that (TB) is not that great a heat exchanger and too small but there is a throttle plate that will get hot from the contact of the surrounding aluminum that is heated by the heater hose connection. Just a thought I wont be doin this unless I am removing the TMIC for cleaning or replacing the Y pipe.
the heat from the engine block alone has more effect on the air then this mod does. useless mod = poor running in the cold
Yes, but just because something else has *more* effect doesn't make this useless. It's like the people saying it doesn't matter whether the intake air is cold or hot since it "gets heated up by the turbo anyway". Any bit helps. As to the original question... as long as the coolant circulating through the throttlebody does heat it up (basically, is it hotter than the throttlebody normally is) it will have a (probably very) minor impact on things. Chances are you won't notice a difference; if you are concerned about affecting how the car runs when it's cold you could always put some type of diverter valve on it so you can turn the bypass on/off. Also, gotsol: regarding 'poor running in the cold' -- have you actually tried this and experienced the car running worse? And what's considered the threshold for cold enough that it will make a difference? 30 degrees? 20? 10? It never hurts to experiment rather than make sweeping statements like 'lol useless'. If Ming's willing to guineapig this I say go for it!
I had a Honda who had an issue with the coolant bypase valve (technical name: thermo plunger) So it was the same effect as this mod If it was around 40 degrees the idle would bounce all over the place. It drove me crazy
I did this on my '97 Formula and it never affected it negatively in cold weather, so no telling how a Subaru will behave unless we try it.
NASIOC feedbacks http://forums.nasioc.com/forums/showthread.php?t=936871&highlight=bypass+coolant http://forums.nasioc.com/forums/showthread.php?t=857142&highlight=bypass+coolant http://forums.nasioc.com/forums/showthread.php?t=798080&highlight=bypass+coolant http://forums.nasioc.com/forums/showthread.php?t=755485&highlight=bypass+coolant just a few i searched I doubt it is something i can feel (butt dyno) BUt i know little things help. If you are trying to squeeze or tap into wasted power then why not do it. They say tipping the IC a few deg help too shrouding the hot pipes and turbo help too Heat is your enemy on air intake Why do the CAI ? Why shield the hot parts ? Why FMIC ?
While you are at it, you should shield the powersteering fluid lines that run right by the turbo, trust me, it's worth every penny Ive read about titling the IC, in fact its rumored every model year up has titled the IC a bit more than the one before. In a perfect system, it would all be properly coated for heat resistance with proper sheilding for heat deflection, however, its not for monetary advantageous on a mass scale. You could always try it, and if cold temps are an issue, you could revert back to stock correct?
Anytime you can cool the air going into the turbo its good. There is some kind of ratio and right now I cant think of what it is, but as you increase the boost level you also increase the tempature. So 10 extra degrees of inlet tempature actually equals 15 or 17 or what ever the case may be. Maybe Scott will chime in as I'm sure he probally knows the ratio. By the way, This was done on my car almost first thing. Matt
if you really want to make it even cooler (too much work for min gain) Plumb a water line in place of that Coolant line and turn on and off a close loop pump and wrap the line around the AC cold side line. portable water pump <$10
Sorry I should have clarified, someone posted earlier about the cold air intake thing. I was refering to that.