red05bullitgt
Member
Actually. that was what I thought as well. However after speaking with Marty, from Ford Racing..he found out some info. concerning the HC trap, from a Ford engineer, who used to be an SCT tuner. and they later both confirmed, that NO calibration changes were made to the stock programming, after FORD discontinued installing the HC traps, in mid 05.. in addition, I also spoke to Sean, from Murillo Motorsports, who is also an SCT tuner and used to work at FORD, and he also confirms this as well.. he also claims, that unless a critical issue would warrant a programming or calibration change of any kind, especially during the middle of a production year..its FORD's policy to avoid making any un-necessary changes, mostly because of additional programming expenses involved.. and when it comes to Ford managment..it doesn't surprise me, in the least bit.. LOL... As to why K&N requires the HC trap.. there are only 2 reasons I can think of that would possibly make any sense.. 1. would be for emission concerns, meaning covering thier butt. and 2. the combination of removing the HC trap, and installing a high flow drop in filter, may cause the air fuel ratio, to go lean beyond the 5% adjustment range..other than that, I really have no other reason, I can think of, that would possibly make any sense..Anyway, hope this helps answer some of you're concerns..I8URVTEC said:The word on the K&N is that yes, it is more restictive than other CAIs so it does not need a tune nor does it produce as much HP. I have heard that with the K&N you need to take the HC trap out of your stock air box and put it in the K&N. That restricts the flow enough that you don't need a tune. If you take that out and run the K&N by itself you do need a tune. That is what I have heard anyway.
The reason you have to retune is b/c the '05's computer can only adjust 5% in either direction to correct for a lean situation. Most CAI's cause enough additional air to go through so that the fuel cannot keep up within that 5% range so you go lean. You need a tuner to change beyond that.
I added over 20 rwhp and 30 rwtq using JLT's CAI and a custom SCT tune. For $650 it was worth it IMO. ($500 for XCal2 and custom dyno tune, $150 for JLT CAI).
Here is the thread on my JLT intall, tune and dyno:
http://franksperformance.com/Forums/index.php?showtopic=161