98 200sx SE-R HS CAI Install Question

mlinarz · Dec 30th, 2002, 07:53 AM

While installing the HS CAI this weekend, I noticed the MAF has a 3" opening on one side, and a 2.5" opening on the other. The smaller opening faces the throttle body. Couple of questions. 1. Why this reduction in size on stock MAF? 2. HotShot provided a silicon reducer coupler, but the reduced end of the coupler was still too large for the 2.5" end of MAF.
After install, it doesn't seem to suck in air anywhere but the filter, but I would have thought the coupler would have been better sized.

gottabfast · Dec 30th, 2002, 07:56 PM

Intakes are designed to create vacuum...reduction in diameter increases flow by increasing pressure on the air in the track...actually, intakes don't creat vacuum, they continue the vacuum created by the cylinder and manifold. This is my best guess as to why.

Jan 4th, 2003, 01:55 AM

I have the same car and intake as you and the reducer coupler was sizes perfectly. Of course, they started by sending me only one and I had to hound them for the other =/ I'm not sure why you're couplers didn't fit - maybe you were sent the wrong ones.

Aaron