V8 Air Intake

C

CXS

Senior Member
I get some wheel rub when fully stuffed off-road since I run 285/17/70's with an OME 2" lift. It's not usually enough to concern me at all but due to the frequency of wheeling I finally ripped off what remained of the wheel well liners.

This exposed the air intake on the passenger side so I removed the intake that goes in there and blocked off the hole leaving the intake under the hood. I can't see any disadvantage but would appreciate any opinions otherwise.
 
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BlackWorksInc said:
Warm Air Bad, Cold Air Good.
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Worse than sucking water from the wheel well? :tape:

Of course not but how much difference is there are on a 90 degree day for example? The majority of vehicles I've owned over my lifetime had the intake under the hood.
 
I pulled mine off for a while, the only issue I had is that if I hit water it would get in on my filter easier, but without a liner in the fender it would be worse for you. I'd leave it off personally.
 
CXS said:
Worse than sucking water from the wheel well? :tape:

Of course not but how much difference is there are on a 90 degree day for example? The majority of vehicles I've owned over my lifetime had the intake under the hood.
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I mentioned in another post that the factory air inlet seems to be protected somewhat, at least on mine it faces towards the rear of the vehicle to collect air. Granted with no liner that's possibly more potential for it to get water.

I'm running 285/70R17 with a trimmed down liner for my Shrockworks, where was yours rubbing on the liner from?

Eh, the thing is that it's not pulling in 90* air; it's pulling engine bay air that is much hotter. Not sure how much of a difference it makes though, maybe some ponies and fuel economy? I dunno... never mapped it out, I just know colder air is better from an air/fuel ratio standpoint.
 
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I'll have a good opportunity to see if I can notice any significant performance changes on my trip to Moab later this week. I take my travel trailer which adds a good load going over the high passes. I suspect the change will be minimal but am ready to be proved wrong.

My rubbing is on the rear side of front and rear wheel wells, as I mentioned it's not significant enough for me to worry about it but enough to have destroyed the liners after years of rubbing. I'm not sure why some of us get rubbing and others don't but despite manufacturing specs I know every truck is different to some degree. 180K makes its own changes as well.
 
BlackWorksInc said:
Warm Air Bad, Cold Air Good.

That's about it really...
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BlackWorksInc said:
I mentioned in another post that the factory air inlet seems to be protected somewhat, at least on mine it faces towards the rear of the vehicle to collect air. Granted with no liner that's possibly more potential for it to get water.

I'm running 285/70R17 with a trimmed down liner for my Shrockworks, where was yours rubbing on the liner from?

Eh, the thing is that it's not pulling in 90* air; it's pulling engine bay air that is much hotter. Not sure how much of a difference it makes though, maybe some ponies and fuel economy? I dunno... never mapped it out, I just know colder air is better from an air/fuel ratio standpoint.
Click to expand...

CXS said:
I'll have a good opportunity to see if I can notice any significant performance changes on my trip to Moab later this week. I take my travel trailer which adds a good load going over the high passes. I suspect the change will be minimal but am ready to be proved wrong.

My rubbing is on the rear side of front and rear wheel wells, as I mentioned it's not significant enough for me to worry about it but enough to have destroyed the liners after years of rubbing. I'm not sure why some of us get rubbing and others don't but despite manufacturing specs I know every truck is different to some degree. 180K makes its own changes as well.
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i was monitoring this the other day when it was really hot here to see. I used the air intake temp gauge on my scangauge and at idle temps were usually about 25-30* above ambient air, but when driving above 10mph up to about 50mph, IAT was only 5-10* higher than ambient air. warmer yes, but i can't imagine it'll be that detrimental. keep in mind i have the stock fender but do have the K&N intake
 
Thanks for that Ethan, I haven't noticed any difference around town in 90+ temps. I think I'll end up modifying the stock setup by routing a new intake towards the front of the truck at some point.
 

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I had the same problems with my FJ and the GX. On the FJ, the tires would always rub on hard landings, so I took the wheel liners away but after one day on a trail, went into a puddle fast and drowned the airbox. Luckily it didnt hydrolock but the engine did stall and water was coming out of the airbox.

On the GX, I did away with the wheel liner as well but this time I ended up just adding a snorkel so I wouldnt have to worry about it. I wouldnt block off the airbox hole as most of the air to the intake is coming from that way but maybe route it a different way or pick up a k&n intake or a snorkel like I did.
 
470SNC said:
I had the same problems with my FJ and the GX. On the FJ, the tires would always rub on hard landings, so I took the wheel liners away but after one day on a trail, went into a puddle fast and drowned the airbox. Luckily it didnt hydrolock but the engine did stall and water was coming out of the airbox.
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The primary reason I decided to do something was finding traces of dried muddy water in the airbox. Not enough to be real concerning but enough to show me the potential for sucking in more.

470SNC said:
On the GX, I did away with the wheel liner as well but this time I ended up just adding a snorkel so I wouldnt have to worry about it. I wouldnt block off the airbox hole as most of the air to the intake is coming from that way but maybe route it a different way or pick up a k&n intake or a snorkel like I did.
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I'd go with a snorkel but there's not one available yet. You misunderstood my blocking the hole, what I blocked was the hole in the passenger fender, not the airbox hole.
 
CXS said:
The primary reason I decided to do something was finding traces of dried muddy water in the airbox. Not enough to be real concerning but enough to show me the potential for sucking in more.



I'd go with a snorkel but there's not one available yet. You misunderstood my blocking the hole, what I blocked was the hole in the passenger fender, not the airbox hole.
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Last time I went mudding I had a ton of mud caked on the bottom of the intake air box (about .25~5" maybe?) but the air filter was just dusty, not coated in mud like I was expecting. But I understand the concern.
 
BlackWorksInc said:
Last time I went mudding I had a ton of mud caked on the bottom of the intake air box (about .25~5" maybe?) but the air filter was just dusty, not coated in mud like I was expecting. But I understand the concern.
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Mud? What's mud BW? :noidea:
 
I can answer my own question- it's not a good idea. I just drove from Denver to Moab, 95 degrees, 3500 lb trailer and A/C on for a while. Motor, tranny both hotter than before, MPG's horrible. A/C off made temps drop but still hotter than normal before pulling the intake. MPG's still awful. Obviously the high temps under the hood account for big changes so I put it back on, no water to worry about in Moab.

Time to wheel for the next 5 days as I introduce my son (FZJ80) to Moab!
 
CXS said:
I can answer my own question- it's not a good idea. I just drove from Denver to Moab, 95 degrees, 3500 lb trailer and A/C on for a while. Motor, tranny both hotter than before, MPG's horrible. A/C off made temps drop but still hotter than normal before pulling the intake. MPG's still awful. Obviously the high temps under the hood account for big changes so I put it back on, no water to worry about in Moab.

Time to wheel for the next 5 days as I introduce my son (FZJ80) to Moab!
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Sounds like you were pushing your rig pretty good but good info to know. I always thought the factory air intake worked well as my IAT's were only a few degrees above ambient when cruising.
 
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