Intake tube change-out.
While I was working on the CV intake system I had a chance to take a second look at the intake tube and although I installed a 3” intake on the end of that tube, the tube leading into it was much smaller


This works out to about 1.5”. The manual says the throttle body is a 48mm which works out to 1.88”. Ok, so..this should make restriction at some point and put a vacuum on the airbox. To test this I rigged a vacuum gauge on a long hose to the water drain port on the box and ran it up to the passenger seat so I could see it. Started it and gunned it. The needle only quivered a little at first then above ¾ throttle it pulled about ½” of vacuum. Well that’s not very much so I took it to the road in front of my house, put it in low and nailed it. This time it built up slightly over 1” of vacuum. Still not excessive but…you know me... can’t leave well enough alone. So….
Coming off the airbox the boot is slightly over 2.5” and the OE tube makes a 70 degree bend. All I need to have is a 2.5” tube that I can oval like the OE tube and a 3” to 2.5” rubber 90, a new 3” joiner and some clamps to rid myself of this restriction. Bought these items:
http://www.ebay.com/itm/200650531642?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIThttp://www.ebay.com/itm/330580007204?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIThttp://www.ebay.com/itm/311652110458?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AITCustom cut to fit my application then ovaled the tube and installed using better clamps.


Still have my large oiled gauze filter on the outside with the 3” intake.

Tested it again after reassembly and no vacuum build up at all..not even a quiver on the needle. And it did seem to be a little.. “perkier”. Might be my imagination though…lol
This was probably completely unnecessary… but not hard to do and it offers piece of mind that this will not be any reason to run out of power near the top of some sand dunes .