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(FWI) Fenderwell intake...how does it affect MPG?

D

dreama

New member
hey everyone, I've been planning a build for my custom FWI, and wanted to know everyone's EXPERIENCE about fenderwell intakes, please DO NOT say sh:th_skull:t unless you know what you're talking about to avoid confusion..for me and anyone who plans on installing a FWI

-also if you know how much horsepower gain it provides, spill it!
 


okay, here is the dirty:

for someone to create an FWI and for it to be beneficial you need it to be 4" piping with a maximum bend of 22.5* and the biggest cone filter you can find. the problem with it actually being in the fender is that you have to put a big bend in it which i dont care for. i think so long as you get it close to the fender opening then youre golden.

if youre looking for the most power overall you should do well with some form of a short ram like i mentioned above. once you get past a 3.4 setup (if you have a GTP) its really best to just run an open cone (right off the throttle body).
 
hey bio, .......ok..so i don't plan on dropping in pulley size anytime soon (no plans either)...what do u recommend for maximum increase in mpg and performance with my current setup (u-bend/cat delete)/future pcm?
 
Essentially with an intake setup (without an IC or Spray) you want the incoming air to be as close to the ambient temp as you can while STILL keeping the bends in the tubing to a minimum.

I personally like a CAI instead of a FWI. The downfall however is price as the price for a CAI is much more then a homemade FWI. And in reality the gains aren't that significant.

Make this.
 
I have the same or better MPG's before and after the FWI, and I noticed a definite improvement over the stock intake performance wise, both sound, throttle response and maybe a little bit of power. My guess would be maybe 5 HP
 


I got an MPG drop after my intake install. I went from an average of 19.5 MPG (mostly city driving) down to 18.0 MPG after the install. I would chalk up about .5 MPG to the fact that I drove the car a little harder after the install so that I could enjoy the whine of my supercharger, so about a 1 MPG drop overall, but a nice boost in performance, and a good hit of pure fun.

As for the water, I have often wondered about putting some sort of "deflector" inside the fender that would prevent water from getting splashed up inside from a large puddle or something, but I haven't done it. When I do take my car to the car wash (for those times that I don't have the time to wash it by hand) I make sure that I don't get the "undercarriage wash"... No sense in having the car wash spray pressurized water in my intake area!

Other than that, you should be fine. Small puddles are no problem since the water doesn't splash up until the tires (behind the intake area) hit it.
 
Okay, thanks
That was a big prob on my last car, 2002 Trans am with an STS Turbo, you would drive it in just the littlest puddles, and you'd suck water into the turbo...not good
 
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