Honda Odyssey Forum banner
Cancel
Create thread New Garage Forums

DIY: OEM Intake airbox mod

Jump to Latest
21 - 40 of 91 Posts
Discussion starter · #22 ·
stevescivic said:
Do you have some pics of your van with the mods you've put on it? I'm curious as to what the Fujita intake and the exhaust systems would look like.

Thanks!
Click to expand...
Hey Steve! Yes, i will get some up as soon as i can.
 
Discussion starter · #24 ·
Discussion starter · #25 ·
Discussion starter · #27 ·
Glad you like it man, haha i'm in the process of replicating my intake soon as it will be replaced with a larger version in the next few weeks =)
 
#28 ·
Sorry to bring up an older thread, but I just found it and was hoping to get a few answers from folks that may have already done these mods.

For now, I have modified the inside of the air box to remove the narrow channel and installed a K&N flat filter. I also removed the resonator and piping to the stock airbox. For now, I stop there at the mods at least to see how things are. This works well so far and I equate it to being like a short air intake.

At this point, I'm thinking of 3 possible options:

1. Simply cap the end of the existing stock air box with mesh to avoid larger items from getting into the filter box. I know this isn't really needed, but I have found l leaves in this area and I don't think I will remove the filter that often to check for debris.

2. Either extend the airbox pipe, similar to wrongminded, or cut the stock resonator and replace it. Either mod would be to bring colder air into the airbox, similar to a CAI.

3. Complete the airbox mod similar to what TSM_Pikachu did originally.


For the folks that did these mods, did you encounter any negative issues with either mod? For the CAI mods (#2), I'm concerned about mpg reductions at low rpm. For the other mods (#1 and #3) I'm concerned about the hotter air that may be getting into the engine causing lower performance, especially in traffic conditions. What do you guys think? Btw, I'm not looking for any performance gains, other than MPG, as this is a daily driver.
 
#29 ·
croldan72 said:
Sorry to bring up an older thread, but I just found it and was hoping to get a few answers from folks that may have already done these mods.

For now, I have modified the inside of the air box to remove the narrow channel and installed a K&N flat filter. I also removed the resonator and piping to the stock airbox. For now, I stop there at the mods at least to see how things are. This works well so far and I equate it to being like a short air intake.

At this point, I'm thinking of 3 possible options:

1. Simply cap the end of the existing stock air box with mesh to avoid larger items from getting into the filter box. I know this isn't really needed, but I have found l leaves in this area and I don't think I will remove the filter that often to check for debris.

2. Either extend the airbox pipe, similar to wrongminded, or cut the stock resonator and replace it. Either mod would be to bring colder air into the airbox, similar to a CAI.

3. Complete the airbox mod similar to what TSM_Pikachu did originally.


For the folks that did these mods, did you encounter any negative issues with either mod? For the CAI mods (#2), I'm concerned about mpg reductions at low rpm. For the other mods (#1 and #3) I'm concerned about the hotter air that may be getting into the engine causing lower performance, especially in traffic conditions. What do you guys think? Btw, I'm not looking for any performance gains, other than MPG, as this is a daily driver.
Click to expand...
I have the K&N with the intake mod, its been 10,000 miles since i had it installed. No CEL but mpg decreased..............due to stomping it at every where LOL

For the resonator that is just sitting there collecting leaves, i blast some compressed air into the piping so there is nothing sitting in there.
 
Discussion starter · #30 ·
croldan72 said:
Sorry to bring up an older thread, but I just found it and was hoping to get a few answers from folks that may have already done these mods.

For now, I have modified the inside of the air box to remove the narrow channel and installed a K&N flat filter. I also removed the resonator and piping to the stock airbox. For now, I stop there at the mods at least to see how things are. This works well so far and I equate it to being like a short air intake.

At this point, I'm thinking of 3 possible options:

1. Simply cap the end of the existing stock air box with mesh to avoid larger items from getting into the filter box. I know this isn't really needed, but I have found l leaves in this area and I don't think I will remove the filter that often to check for debris.

2. Either extend the airbox pipe, similar to wrongminded, or cut the stock resonator and replace it. Either mod would be to bring colder air into the airbox, similar to a CAI.

3. Complete the airbox mod similar to what TSM_Pikachu did originally.


For the folks that did these mods, did you encounter any negative issues with either mod? For the CAI mods (#2), I'm concerned about mpg reductions at low rpm. For the other mods (#1 and #3) I'm concerned about the hotter air that may be getting into the engine causing lower performance, especially in traffic conditions. What do you guys think? Btw, I'm not looking for any performance gains, other than MPG, as this is a daily driver.
Click to expand...
Never apologize for bringing up an old thread first my friend; This is why search engine on the site exists haha. *thumbs up*

So you removed all the narrow channels which is awesome and installed a K&N filter along with removal of resonator and piping and yes i too equated it to a short ram intake. (FYI; I have an actual short ram intake made specifically for our vans, the airbox mod that is detailed in this thread is LOUDER than the actual intake i have. LOL)

1. You can do the capping but I would probably use a fine mesh, a metal screen of sorts would probably work best or you can double stage it.

2. I think we got into the extension a bit like what wrongminded discussed but we have no one else that has really done it. Care to try?

I have a 05 model which is MAP sensor based not MAF sensor based so I found no drawback. I would not be too concerned about a MPG loss with a cold air intake due to the fact that any "such loss" would be made up above 2k rpm because at that engine speed there will be sufficient air velocity slamming into the cylinder intake ports which would help combustion, the only issue after that would be to free up the exhaust system.

The "hotter air" issue would not really cause a performance issue as with a cold air (Translated = Full metal pipe) because I drove the van 33miles to a dyno, and then ran on the dyno to find power figures. WIth the current modifications on the van (stock ecu too) then van puts out 232whp and 222wtq to the ground....this means power is still there and much increased over stock. I also will be heading back to dyno again to test a new project i've added to the setup.

PS: "Performance" is pretty ambiguous in itself, for you the performance side would be boosting MPG it seems which is great! I went with the venue to try and increase power without losing too much MPG in the process.
MrRangerZr1 said:
I have the K&N with the intake mod, its been 10,000 miles since i had it installed. No CEL but mpg decreased..............due to stomping it at every where LOL

For the resonator that is just sitting there collecting leaves, i blast some compressed air into the piping so there is nothing sitting in there.
Click to expand...
LOL! This guy........................... hahahaha
 
Discussion starter · #32 ·
MrRangerZr1 said:
Hey how is your odyssey doing? I was just checking out your facebook. Any more mods you did?
Click to expand...
Still at this point unchanged except for my prototyped ported intake lower runners. Dyno will tell us if they helped increase power or just took up my time hahaha if they are good, then they go up for sale and i work on my 2nd set.
 
#33 ·
Interesting.... So basically you cut half the bottom of the air box off? Doesnt that allow it to suck in warm air from under the hood? I think the exl has higher compression so warmer air would cause it to retard timing more than with cool or cold air coming in.

I know with my gen 2 insight for trips under 10 miles letting the engine suck air from under the hood helps mpg, but trips longer than 10 miles it hurts mpg.

Im just unsure how it helps mpg if you have an exl and when its in eco mode its only running on 4 or 3 cylinders? :huh:
 
Discussion starter · #34 ·
Cobster said:
Interesting.... So basically you cut half the bottom of the air box off? Doesnt that allow it to suck in warm air from under the hood? I think the exl has higher compression so warmer air would cause it to retard timing more than with cool or cold air coming in.
Click to expand...
Compression ratio is same on the vehicles.....EX-L/Touring to LX/EX

I removed resonator and then removed restrictions within the lower air box itself and then opened up the intake inlet. I've done it on numerous cars without any adverse effects.
"Warm air" theory is valid to a certain point but a dyno has verified i'm making great power to the wheels (232hp and 222tq at the drivewheels, which means it already accounted for the 15-20% drivetrain loss. This means motor output is roughtly 290hp with 278tq at engine)

You actually would WANT to retard timing as rpm's increase, this is because the engine is rotating so fast that advanced timing would be inefficient. (Advance down low, retard up top).


Cobster said:
I know with my gen 2 insight for trips under 10 miles letting the engine suck air from under the hood helps mpg, but trips longer than 10 miles it hurts mpg.
Click to expand...
Insight is hybrid with smaller motor, also for trips under 10 miles you have bigger issues than underhood temps and "less mpg"
Smaller drives (5mi and under, so 10 mi is just outside borderline) and lots of start/stop along with lots of idling time activity is the harshest on your engine, it allows acids to form during warmup phases and these acids then attack engine oil which then attacks the engine components. This is why it is best for most drivers to start the vehicle, idle for 30-60 seconds in order to get oil flowing, and then drive with a reasonable acceleration curve. This allows the engine temp to rise at a reasonable rate, without letting too much acids or other such toxic combinations to build and affect the motor.......the reason why? The engine is moving enough air in and out of it to vent such gases, and air/fuel ratios are calming down to keep a pleasent driving experience.


Cobster said:
Im just unsure how it helps mpg if you have an exl and when its in eco mode its only running on 4 or 3 cylinders? :huh:
Click to expand...
There is proof of the mpg, as seen by roadtrips. I can attain 22mpg with a trip to vegas from CA (274mi) and back on one tank.
45~55% of the time spent in ECO mode too and it is 3 cylinders, the 05-07 models used VCM, 08+ used VCM2 which has it's own set of issues.
 
#35 ·
Btw, I took another look at the stock airbox. As others have mentioned, the Ody actually gets air from in front of the battery, just behind the radiator fans.

Based on my second look at the stock airbox, I would confirm that especially since the lower air box unit is almost sealed completely. If I get a chance this weekend, I'll take some pics and try to cut it in half to see what it looks like. My initial thought is that using it as a CAI won't really work well in my set-up primarily because I have the foglights. Based on where I would have to cut the airbox, there may not be enough openings through the fender liner to bring in cooler air. Either way, won't hurt to find out as I don't plan to put it back together to stock.
 
#36 ·
croldan72 said:
Btw, I took another look at the stock airbox. As others have mentioned, the Ody actually gets air from in front of the battery, just behind the radiator fans.

Based on my second look at the stock airbox, I would confirm that especially since the lower air box unit is almost sealed completely. If I get a chance this weekend, I'll take some pics and try to cut it in half to see what it looks like. My initial thought is that using it as a CAI won't really work well in my set-up primarily because I have the foglights. Based on where I would have to cut the airbox, there may not be enough openings through the fender liner to bring in cooler air. Either way, won't hurt to find out as I don't plan to put it back together to stock.
Click to expand...
Keep us posted on what you do next!
 
Save
Reply Quote Like Like
Discussion starter · #37 ·
croldan72 said:
Btw, I took another look at the stock airbox. As others have mentioned, the Ody actually gets air from in front of the battery, just behind the radiator fans.

B.
Click to expand...
Yes correct as the snorkel piping is held there by a popclip and is the leading "snout" with which to take in air. However the biggest drawback I felt to the setup was not only the snorkel piece you mention but also the single channel in the airbox assembly itself. My thoughts were that without a large enough capacity to draw air through, power would then suffer at the expense of a "peaceful drive" in which case I would then be bored.



croldan72 said:
Based on my second look at the stock airbox, I would confirm that especially since the lower air box unit is almost sealed completely. If I get a chance this weekend, I'll take some pics and try to cut it in half to see what it looks like. My initial thought is that using it as a CAI won't really work well in my set-up primarily because I have the foglights. Based on where I would have to cut the airbox, there may not be enough openings through the fender liner to bring in cooler air. Either way, won't hurt to find out as I don't plan to put it back together to stock.
Click to expand...
Yes the lower airbox is pretty closed off, hence this thread to help us all realize that there is still things we can do to improve power and response.
You CAN USE a cold air setup even with foglights. A technical "cold air" intake would set the filter body inside the fenderwell area with no additional cutting in which case would offer no interferance with the foglights at all.
 
Discussion starter · #38 ·
aaronleong said:
Keep us posted on what you do next!
Click to expand...
Couldn't have said it better, i'm glad to see more people being active, posting up ideas and what not. It's really nice to be able to hear/see/read about theories, mods, upgrades and upkeep lol
 
#39 ·
TSM, do you think the Honda engineers restricted the engine's breathing, among other things, because they knew that our engine mounts (which already seems to wear out faster than the average bear) would not be able to take the increased torque/response?
 
Save
Reply Quote Like Like
#40 ·
Has anyone here with 07-above models had issues with the CEL coming on after this mod? I'm in CA, so smog tests are what I'm curious about.
 
Save
Reply Quote Like Like
21 - 40 of 91 Posts
About this Discussion
90 Replies
13 Participants
Last post:
DiscipleN3:16
Honda Odyssey Forum
posts
1.1M
members
432K
Since
2000
Odyclub community is the #1 forum to discuss all things Honda Odyssey: minivans, safety, service maintenance, mods, and more.
Full Forum Listing
Explore Our Forums
2005 - 2010 Odyssey 2011 - 2017 Odyssey 1999 - 2004 Odyssey 2018+ Odyssey Problems and Concerns