Take the entire flapper off of the intake to your box that connects this exhaust air hose and just connect everything direct to the intake on the front of your car. That flapper and the heater hose are problematic IMHO. The flapper is like a large tumor in the throat of the cold air intake. See the other recent posts about this device. BTW, the diameter of this aluminum/fiberous hose is 2 inches and its about 4 feet long. Google it and you’ll find it available all over the place. Regards, jjz
Maybe in Russia?
Yes, theory is to help warm up the engine faster in cold weather, but I am thinking that the German Engineers were thinking cold weather like Russia or Antartica? But still, after the engine gets warmed up, the flapper mechanism itself blocks the intake a full 50%. Even after it flips to the cold air in draw side. Drove my flapperless car in to work again today and did not need the right lane at all, nor did I have any issues with fast merges onto the expressways. Conpletely different car. And, my lambda compensated correctly for the increased air flow according to dwell meter, so no adjustments to the air/fuel ratios. Regards, jjz
Does not pull in exhaust gases…
Does not hook up to exhaust gases, just a shroud around the end of the tube attached to the exhaust manifold to heat the intake flow. It is not a smog component. It is an automatically deleted item for cars shipped to warm states like California, the most stringest fog state. Here is a better pic. These cars came with and without the flapper. Part # 12 is the flapper. Part #7 is the tiny tube going to the heat shield, which is part # 8. Deleteing parts 7, 8, 9, and 12 is what I did. I hooked up direct to cold inlet using part #10. The flapper is a massive restriction into the air box regardless of what side it is sucking in; hot or cold. The change in my cars performance is remarkable. I drive a Hamann/Dinan tuned Z4 for fun. This little cabby is now quicker out the gate, in merges, and on the open road. Try it!
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