Help Please!

ByThaBay

With the a2a setup the turbulence normally present at the stock stillen MAP sensor location goes away. If choosing to run the stillen manifold unmodified, then tapping in between the two throttle bodies is the way to go to get a clean manifold pressure reading with minimal turbulence.

MoulaZ

Turbulence as reason make sense. What doesn't is how changing from W2A to A2A affects Turbulence. Air still flows past the same TBs in the same manner, albeit more flow overall. I'd be pretty concerned the characteristics changed so much inside the intake manifold to necessitate a change in MAP location.

ByThaBay

I haven’t confirmed it myself but it’s what I recall he told me also. Perhaps someone that has both installed can do a few runs side by side and check the variation in the two different readings.

turtle64b

So you have two Mass Air Flow sensors that meter the air coming into the engine as it flows past them. There is also a Manifold Air Pressure sensor on the back driver's side of the intake manifold (stock or Stillen). With the a2w setup, that heat exchanger is in the way of air entering the intake manifold and getting to the engine. This can cause pressure fluctuations (turbulence) where the stock sensor position is. Moving the sensor to before that heat exchanger (n between the TBs) gives you a more accurate reading of manifold pressure.

With the a2a, that intercooler is not in the way and so the air flows through the TBs into a giant cavern (relatively no turbulence) before entering the engine.

Just my thought on the why, but I am not an expert.

MoulaZ

Ahhh, forgot about that piece of crap Intercooler inside. I had erased that terrible thing from memory, lol. This is a fair point.