I posted this in the FJ Cruiser group on FB but thought I'd bring it over here as there was a serious lack of information out there.
2008 TT at 100,300 miles with a TRD supercharger and TRD exhaust installed at 3000 miles by first owner. I'm adding the TRD CAI now and this is what I'm discussing below.
Several things worth mentioning.
1. The TRD install docs for the CAI are lacking to say the least.
2. Lean condition previously reported on here regarding the 2nd Gen TRD CAI with the TRD supercharger.
3. Both above I think are related and I'll explain below.
Removal of stock airbox assembly, except for the intake tube in the fender, is very simple and covered well enough in the docs.
1. Install docs mention removing 5 bolts to remove the inner fender. Nope, there are several of the plastic press in clips that need to come out and as most know they are a total pain in the arse. .80 ea from the dealer, go buy 5+ to have on hand, you will need them. Once those were removed (actually 4) I was able to peel the inner fender liner back enough to remove the rear bolt for the intake tube in the fender (which has to come out)...the front bolt was rusted and very hard to see but could get to it with a 1/4" drive and short extension. Unfortunately since it was rusted it seized and I couldn't see it as I was trying to unscrew it and I twisted the little mounting bracket... I lost my temper and went Hulk on it... and out tube came, the bushing pulled through. It's not going back in so the bolt and bushing stay in there. I would suggest jacking up the FJ and removing the wheel/tire to make life much easier.
2. The biggie in the install docs is the black intake tube between the airbox and throttle body. With the supercharger it's too long. The docs simply say if it's naturally aspirated the throttle body coupler (rubber tube with holes for nipples to attach crank case vent and vacuum hose to fuel pressure regulator?) should line up with the middle bead/ring...if supercharged the inner bead but then it will block off the holes for the nipples in the throttle body coupler. Not a word about cutting it to length as shown in the attached screen shot of the docs.
So.. I searched and searched on this, not a peep I could find on here or Google but did find this one YT vid about a lean code condition on the same setup in a Taco...remember the lean condition threads on here regarding the 2nd Gen CAI and TRD supercharger when you see this: https://youtu.be/TfMpeTdseMU
3. If you don't cut the tube down a bit then you block off the ports as referenced in the video and wala... lean condition. I suspect that many follow the TRD docs verbatim and this is what you get but that's my guess. It was such an obvious problem that I didn't want to cut until I read up a bit...can't glue it back on
so. I cut it just to the driver's side of the middle bead on the tube and all was good.
Right now it idles at 14.7 stoichiometric but under WOT or close to it will drop to 12.18 or thereabouts. As I didn't take any before readings with Torque I can only observe what it is doing after the CAI install. I'd love to hear from some that have studied the CAI/stoichiometric conditions more on this. As I write this, no lean conditions to trigger a code/light.
Some discussion about the TRD CAI and lean conditions in general: https://www.fjcruiserforums.com/foru...-installs.html
Thought I'd pass this along for any future TRD supercharger/CAI folks to reference.
I'll say this.. at about 90% throttle on my test drive I broke the rear tires loose... traction control engaged... at 40-45 MPH...which it didn't do before. I can hear the intake a bit more but it's drowned out by the SC whine...runs great... so far.