DWV intake mod for 2004-2008 F150 with 5.4L engine
#107
I've done the DWV intake mod with the rubber connector into the firewall, and have had no problems. I was planning to remove the "baffles", "silencers" or "resonators", or what ever the heck they"re called, but now I see that maybe they should be left on. I've got the knockout caps to plug the holes. Should I remove the "Helmholtz" resonators or let well enough alone? The truck seems to run well as is. It may look better without, but am I risking anything by removing them?
#108
#109
I just got around to purchasing the alternate rigid 3 inch tubing that fordmt08 used for his intake modification and it looks like it will work well installed a couple of different ways. The tubing required is made by Spectre Peformance. It is part number 8741 for the black color (8742 is Red, 8746 is Blue, 8748 is Silver) and it is called: 3" Flexible Air Duct. It is priced ~$20 and should be available at O'Reilly Auto Parts and Autozone stores. I installed it completely collapsed using one of the two connectors that come with the kit to go into the fender inlet and using the downspout connector to connect to the stock flexible section. It fits perfectly and does not require any hose clamps. I will be testing it out with my Gryphon Custom 87 performance and Custom 87 towing tunes this week. This variation completely eliminates any possibility of the downspout connector collapsing or getting sucked inside out.
Last edited by kd4crs; 07-27-2009 at 09:58 PM.
#110
Drone with CAI
The original Gotts mod is for 97-03 F150s and those that have the conical air filter in the large round housing. This is the same concept applied to the intake of the 04-08 F150 with the 5.4L engine. JackandJanet also adapted a variation of the Gotts mod to the 04-08 F150 with the 5.4L engine. The DWV intake mod is not intended to work as good or better than an aftermarket CAI. It was intended to improve the intake air flow by removing the restriction at the end while preserving the factory noise reduction built into the stock intake. I have tried several other aftermarket CAIs and they all created horrible drone while towing our travel trailer. This mod does not create any drone whatsoever.
#111
#114
I just did this install last night with a K&N drop in filter, and the throttle response and pickup was a lot better. It didn't add much fuel mileage or change the normal drive conditions, but when accelerating or WOT it was a lot smoother and less hesitation. Other than my Livewire tuner this is probably the next best addition to performance yet.
#115
And as far as preventing the rubber nosepiece from sucking into the intake, I took another worm clamp and put it around that piece to prevent just that. I was able to get it to seat all the way down before clamping, so if yours didn't seat well that may be the reason it's coming off easy. The clamp should help prevent this in either condition.
#117
the cold air from the grille is way better then the fender...so ud cut a hole and reroute ur air intake? sounds pointless...i wouldnt do it
#118
Just fabbed up 2 of these units tonight. Installed one on my '05 and giving the other to my cousin for his '06. I'll do the test drive on the way to the office in the morning. Get back with an opinion after. This mod just makes sense to me. Opening up that hole improves airflow rate exponentially. It's gotta help.
Thanks,
David
Thanks,
David