I quit following the threads about our intake problems a couple weeks ago so I don't know if anyone has found anything out or if the new CIA Sri was any good. Anyways I got to talking to some friends in Chicago EuroCharged and he was saying if the MAF is before the turbo it will have rough idle but great A/F at high boost and if the MAF is after the turbo it will be the opposite, good idle but rough high boost levels. Then I told him ours was before turbo. His said most likely the MAF is sitting to close to the turbo. I made a thread asking for Dimension from turbo to MAF on the stock setup but no response.


I am thinking about Cutting my Dejon Sri in half this weekend and putting a silicone tube between the 2 to make the MAF farther from the Turbo


Any ideas? or references to anything other people of figured out would be great

 

Sounds like a question the guys with the AEM intake can maybe answer for you.. The AEM CAI relocates the MAF right behind the filter in the wheel well.. Don't really know if there is any benefit to that though

 

I've been running the AEM CAI for several months now. LTFT's skewed ~10% because of the larger diameter at the MAF sensor fooling the sensor into thinking it's seeing less flow.

Cold idle surging that is mostly tuned out with cat warmup cam tables. (Thanks, Term2!)

No flutter in cruise or WOT, flows good but I can't see where the sensor being farther from the turbo matters. As the flow increases at the turbo inlet, the pressure drops across the entire intake causing more air to rush in past the sensor. The diameter of the intake is considerably larger than the turbo inlet so I can't see a pressure drop across the length of the intake, and what goes out the turbo must get sucked in the filter. If it changes anything it might be by microseconds. Just my 2 cents. I do see a rich spike at initial stab of WOT, but I'd have to see a stock intake log to see if there is any change. Sadly, I don't have any logs of the stock air box.

If I were designing the intake, I would have put the MAF after the straightest section of the intake pipe. In instrumentation primary elements it's preferred to have 10 pipe diameters between a sensing device and any bends to minimize turbulence. I've thought about putting a mesh screen at the filter connection to the tube to try and laminar the flow some, but haven't gotten around to it since I have the MAF dialed in to 0.0 LTFT's now.

 

Really. :/