Quote:
Originally Posted by nzmoman
I ran my wastegate to the cold pipe nipple that came with my fmic. I was told that this is an okay place to run it as it is before the Throttle. Even though its not really close, the way I understand pressure is that it doesn't flow through the piping it exists throughout the piping at the same rate.
I guess the difference as I understand it is putting water in a tube vs putting air in your tire. Water in a tube flows and there can be more of it in one place than another.
Air pressure in your tire is universal throughout the inside of the tire. So as you put air in the tire there is not one place inside the tire that has a lesser or greater pressure in the tire it is changing all at the same time.
So I wonder, what would be some of your opinions on a location other than the throttle? I am by no means an expert, but the physics of gases makes me think that as long as its on piping between the turbo and throttle then it will give almost the exact same response... (this is also taking into account pressure drop with large FMIC kits as the actual pressure going into the motor is on the cold pipe not the hot pipe) I am only running 7-10 psi on an S15 BB T28...
any input?
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You are right about pressure.. but the problem is that there is a pressure drop at the FMIC as well as close to the throttle body when the throttle plate is opened. Like I stated before it's hard to grasp this because we think of the pipes being pressurized in their entirety to say 10psi. That is true, but the problem really lies with the distance this pressurized air is "traveling." Pressure will always be greater in the instance it is created at it's source. This is why you want that nipple right at the compressor housing or hotpipe. It is the "closest" you can get to a "clean" pressure signal. I'm not a physics major or anything, just a humble lawyer, so I can't really explain it in depth, but I'd be happy to ask my father, who is an engineer exactly how to explain it better later.
As for the nippled s14 hotpipes, they don't exist, I did a lot of searching. GReddy supposedly used to make one, but most of the time now you will be making one or buying a cheap chinese one from Heavy Throttle, which does not have a nipple on it. I bought mine from Heavy Throttle and welded the nipple on it.