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Fresh Air/Air-Pump Bypass

18K views 55 replies 16 participants last post by  emaxxer  
#1 · (Edited)
I don't know why it never donded on me to have done this earlier, but with a little help from brewer15650, here is a brief write-up on what I did.

A recent bad battery ground promped me to remove the lid off of the battery box for the first time since owning my 2008 truck from new. I make a pretty good effort to keep my truck clean both inside and out (including the engine bay), but was disappointed to see that I had over-looked how much dirt and grime had collected in the battery box due to the the fresh air vent that feeds from in front of the grill. Like many others, I decided to delete the box altogether.

Now I have this pretty nifty funnel tube sitting around, my mind instantly goes to how can I utilize this to get some more fresh air to the air intake box? Bingo, I got an idea. *EDIT* I learned that the air-pump pumps fresh air into the exhaust (not out of the cranckase). Thanks again Cory (05_quick4door).

After consulting the online instruction manual for the '07+ cold air intake systems, I gathered that you could indeed order individual parts, as the manual had all the items broken out. What I was after was the small filter for the air pump, the quick-connect adapter and clamp. I then called K&N directly [(800) 858-3333 or (951) 826-4000] and ordered the three part numbers that you will see below. Free shipping yielded a small parts order of $32.35.

RC-2540 (Filter) $27.97
08431 (Hose clamp) $0.39
088012 (Adpater) $3.99
$32.35

Now that I had all the parts I needed, I spent all of 10 minutes to put it all together. I disconnected the air-pump hose from the stock air box. Fed the vent tube (from the battery box) between the radiator and the rad support to the air box (had to cut about 3 inches off the vent tube) and used a hose clamp to secure. Next, slide the filter onto the adapter and secure with the provided hose clamp. Snap the new filter w/ adapter back into the air-pump hose and re-route to in front of the air box. I ended up securing the hose to the AC hose with a zip tie just for added support, but is not needed. Done.

Now I am getting a little more cold fresh air to the air box and still allowing the air-pump to pull filtered fresh air into the exhaust...all while cleaning up the battery secure area as well. All for $33. Win, win!
 

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#5 ·
Haha, I hope not. I highly doubt that they are even potent enough to combust.

Holly shit your a genius! I would have never thought of something like that. lol Good job cracker.
Lol, ok, ok, Dave Brewer helped me with this idea. I only modified it in that I left the filter outside of the box rather than routing it back into the box like Dave had suggested. Thanks Dave!

looks good man...15hp gain for sure.
Ouch, that hurt. Thanks though man. Not a performance mod, just cleaning some shit up.
 
#20 ·
I'd also like to add, that if you do not like the idea of having the filter just floating outside of the box, you could drill an appropriate size hole back into the stock air box (either on the front or side) and use the filter and adapter just as you would see it on an actual full K&N cold air intake heat shield; putting the mini filter back in the stock air box. Where I have my filter located, I feel that it is far enough away from pulling any major warm air in. It is directly behind the passenger side headlight, which a decent amount of air flows in from between the bumper and bottom edge of the headlight.
 
#26 ·
I took all of this crap off my truck and associated DTC's and my truck runs awesome but what I should have done is keep the pump and hook it up to the crank case vents and use it as a crank case evac pump. Ssk needs to start making these block off plates with a sweet ssk logo.
 
#27 ·
Interesting would be nice to see before and after IAT temps. On a side note I love the battery cover, and vent hose, prevents acid from leaching out and rotting out the fender battery tray, go look at a 10 year old vehicle with out one and you will most likely see the corrosion settling int already
 
#28 ·
Or get an optima battery cause the stock battery sucks and optimas are easy on the eyes without need for the box. Weight reduction!!!! :lol:
 
#31 ·
You beat me to it! Been meaning to mention that for days but kept getting distracted by other threads. lol

I almost did the same thing(before seeing this thread), and realized the same, that the air going in would be unfiltered. Not good!
 
#42 ·
So from the pics "Joe canyon" sent me, it's very clear that there is no divider but rather a baffle-like thing on the inside of the air box lid. So your mod is no good. You could cut holes in the bottom half of the box underneath where the air filter seals. That's what I did to free up some airflow to the filter on my old Saturn. It worked really well with a high flow filter. With your custom intake tubing, it would work as good as any aftermarket intake with a high flow filter. I'd recommend the drop-in aem dryflow filter since these maf's hate oiled filters.
 
#47 ·
Looks like I need to figure out how to get a filter inline with the new intake tube feeding from in front of the grill. Un-filtered air is definitely getting pulled into the intake. Although, its not as bad or blatant as some may have thought, being as though the air does hit the divider first and directed down towards the filter, but clearly air can get pulled in from the space where the divider does not go the whole way down to the filter.