Correct position/orientation of euro HFM?

[MIKe30]

Which direction should the plug be facing? I see pictures with it in all different positions. Whats proper? Does it matter?

Discuss.

[Farbin Kaiber]

IIRC it should be clocked to aprox 10 o'clock from the front of the car. The connector facing towards the VC.

[Mako18]

Why??????

[Farbin Kaiber]

To place the element in the optimal metering location.

[matt]

OK heres the long answer.

It depends on your intake. If you have a filter right on the MAF, it doesn't matter that much. If you have a curved intake leading straight into the MAF, you will have air that's still turning passing through the MAF. That means that you will have more air against the outside of the curve. So if your MAF is sampling the outside of the curve, it will read too high and you will run rich. If your MAF is sampling the inside of the curve it will read too low and you will run lean. If you're OBD1, this may throw a MAF or O2 sensor code. If you're OBD2 you could get adaptation limit codes.

Bottom line, if you don't have a wideband, don't worry about it too much.

[MIKe30]

nice, thanks for the clarification. So if I add a few inch long straight tubing to get my cone off the maf it still doesnt matter right?