Intake/Hood Question - Dahlback w/ hood vents?

[Fonzie Audi]

The side vents on my hood are directly over where the filters are located on the Dahlback intake (see pic below, outlined in red). Usually i hear that the Dahlback intake isn't great because it sucks in plenty of hot air - but if i have my vents located directly above the filters, does anyone think i would get enough gains (if any) out of it to install the intake?

<a href="http://s181.photobucket.com/albums/x239/slikjoseph/?action=view&current=intakehood.jpg" target="_blank"><img src="http://i181.photobucket.com/albums/x239/slikjoseph/intakehood.jpg" border="0" alt="Photobucket"></a>

[Beastly]

clearly fate is speaking to you here....

[terrytcl]

i think it would be easier to get some brake ducting, build a closed canister for the filters, and have the ducting go from an opening near the front leading to the canisters. try http://www.pegasusautoracing.com/

[terrytcl]

and http://www.hrpworld.com/index.cfm

[MrBucket]

wouldnt want to use it in the rain though

[snoopra]

I think you should sell me the dahlback!:jlol: Custom ducts sounds good too.

[Fonzie Audi]

I think you should sell me the dahlback!:jlol: Custom ducts sounds good too.

I would snoop, but i don't have a dahlback yet :) :). I found that pic on this forum to use as an example..

The point of this thread is to find out if vent placement makes it worth it for me to get the dahlback..

[vangelis]

I don't recommend having the hood side vents on top of the filters, all hot air will be going out from the vents and if the filter directly under them, the filter will sucks all the hot air back again to the engine. I think so,not sure.

[DHall1]

Think about air flow.

Air flow across the hood when your driving 50mph, 70mph, 100mph

Now, take a string with small air elements and anchor it in front of each hood vent. Go drive your car and think about where that air flow will go?

Will it go into the hood? NO

Why? Path of least resistance. The air under the hood needs a place to go so it will go out of those holes. The air under the hood creates a pressure and temp gradient and needs to get out in any manner. Ever feel the hot air coming out from every gap around the engine compartment even sitting still? Less pressure and not as hot outside thus that air will move out.

My terms may not be completely correct. I didnt grab my old Physics book to verify. :idea:

The air flowing across the vent will not even know the vent was there. Path goes right over those holes.

[Fonzie Audi]

Think about air flow.

Air flow across the hood when your driving 50mph, 70mph, 100mph

Now, take a string with small air elements and anchor it in front of each hood vent. Go drive your car and think about where that air flow will go?

Will it go into the hood? NO

Why? Path of least resistance. The air under the hood needs a place to go so it will go out of those holes. The air under the hood creates a pressure and temp gradient and needs to get out in any manner. Ever feel the hot air coming out from every gap around the engine compartment even sitting still? Less pressure and not as hot outside thus that air will move out.

My terms may not be completely correct. I didnt grab my old Physics book to verify. :idea:

The air flowing across the vent will not even know the vent was there. Path goes right over those holes.

Thank you, Dave.

[peiserg]

isnt the dahlback intake some ridiculous price? For what, if any gains? yeah it does look cool, but look at how huge the stock intake filter is on the car..

[10SecS4]

The factory RS6 intake is already a true cold air design. You're not going to gain any power by switching to the Dahlback, with or without hood vents.

You can, however, lose power...

While the cone filters may look cool, their surface area appear to actually be smaller than the factory panel filters. Then you have the issue of their placement and vulnerability to sucking in hot engine air.

Switching to cone filters and changing the size/shape of the piping before the MAFs will have an adverse effect on your air fuel ratio. If you don't re-tune the car after the intake, your AFR will be way off. Most people don't realize the importance of this.

The factory cold air intake on these cars is not a restriction by any means. On the contrary, it's a very, very good design. I doubt any aftermarket intake would yield any improvement, at least not at 450-550 HP power levels.
__________________
Marc aka 10SecS4

http://titsup-racing.com/video/rs6/rs6_sig.jpg

2003 Audi RS6
11.59 @ 118.63 | Video (http://www.titsup-racing.com/video/rs6/rs6_11_8.wmv) | Timeslip (http://titsup-racing.com/video/rs6/rs6_11_59_timeslip_resized.jpg)
Mods: No pre-cats & my own custom tuned ECU/TCU. That's it!

2000 Audi S4
10.73 @ 132.76 | Video (http://titsup-racing.com/video/s4/s4_10_73.wmv) | Timeslip (http://titsup-racing.com/images/s4/s4_10_73.jpg)
Mods: K04s + bolt-ons + weight reduction (bone stock motor!)

[DHall1]

Agree here.

I look at what MTM has done on some of the built up cars they have. Has MTM ever changed the intake? Nope

Can I do a better job at intake design that what we have on our cars? Your kidding me right?

Add to that the basics from Physics way back when and the little guy in my head says.....thumbs down on that idea. This whole process took about 1 second.

Heat is the major power killer on these daily driven cars. The hotter the air you suck in the intake...the hotter the air gets spit out the turbos....the hotter the air the intercoolers see. Intercoolers have only so much room to drop the temps before the intake air temp sensor sees what you have going into the engine. All your boost, fuel and timing calcs are factored from there. Audi did a good job at the air plenum design and pulling air from the grille. There is plenty of volume and porting differentials to increase the volume of air avail for the turbos to pull in. Thats all you need.

If you want to deal with heat....you have a couple of choices. I have seen Pieserg's Aquamist setup. (I like it) or you could setup some sort of fogger or mister for both the intercoolers. Each approach makes an attempt to cool down the intake charge. More power in hot climates.


isnt the dahlback intake some ridiculous price? For what, if any gains? yeah it does look cool, but look at how huge the stock intake filter is on the car..

[DHall1]

If all of you take nothing away from this thread. Please remember the quote below. I know the folks that sell all those fancy cold air intakes may not like to see this information but its true.

Do not change the size of your intake plumbing without a full custom tune and remap. Period!!!!!




Switching to cone filters and changing the size/shape of the piping before the MAFs will have an adverse effect on your air fuel ratio. If you don't re-tune the car after the intake, your AFR will be way off. Most people don't realize the importance of this.

__________________
Marc aka 10SecS4

http://titsup-racing.com/video/rs6/rs6_sig.jpg

2003 Audi RS6
11.59 @ 118.63 | Video (http://www.titsup-racing.com/video/rs6/rs6_11_8.wmv) | Timeslip (http://titsup-racing.com/video/rs6/rs6_11_59_timeslip_resized.jpg)
Mods: No pre-cats & my own custom tuned ECU/TCU. That's it!

2000 Audi S4
10.73 @ 132.76 | Video (http://titsup-racing.com/video/s4/s4_10_73.wmv) | Timeslip (http://titsup-racing.com/images/s4/s4_10_73.jpg)
Mods: K04s + bolt-ons + weight reduction (bone stock motor!)

[p3u]

Agree, only thing I don't like about the intake is not the intake itself, but the filters. I know its not much of a restriction, but the metal grate on the top of each filter would seem to slightly reduce airflow. I was thinking of removing them from the filter. Might be good for 1-2 hp if chipped :)

[DHall1]

Without the grate you will suck the filter into the turbo.

Turbos suck on the intake side. Dont worry about the pathway so much. Turbos can suck a mule thru a straw.




Agree, only thing I don't like about the intake is not the intake itself, but the filters. I know its not much of a restriction, but the metal grate on the top of each filter would seem to slightly reduce airflow. I was thinking of removing them from the filter. Might be good for 1-2 hp if chipped :)

[p3u]

Without the grate you will suck the filter into the turbo.

Turbos suck on the intake side. Dont worry about the pathway so much. Turbos can suck a mule thru a straw.

Are we talking about the same thing here? The metal grate that is part of the filter is on the top portion of it, it does not support the filter in any way.

[garbi]

i have done it & didnt work. The cooling in the engine conpartment is severely effected, the flow under the bonnet is disrupted . On a track day the car overheats getting to 123 deg celcius. I am working on a air scooplike the subaru bonnet, from maf's directly out of the bonnet. Garbi

[DHall1]

If you didnt have a spine. Well, you would still be a tad pole in the pond.


Are we talking about the same thing here? The metal grate that is part of the filter is on the top portion of it, it does not support the filter in any way.

[RS6-4dr911]

Agree with many points above but not too sure about the whole air/fuel ratio thing. The purpose of the MAF's is to measure the air intake (in units of mass, hence the name) and adjust the amount of fuel being metered. If it didn't do this, it would be nothing more than a fancy carburetor. I would think (note the word think) that it would take a significant increase in air flow to be beyond the range of adjustability of the ECU. I discussed this very subject with a tuner and that was their opinion as well.:mech:

I still say the real problem with the stock intake is the point about 6-9" aft from the intake openings above the radiator. Check out the net cross section, tapering from almost nothing towards centerline, and less than 1.5" (top to bottom) outboard from there, nets to roughly the same as a 2" diameter pipe. I say get that area (not sure how) at least equal to the size of the MAF's and or the round flex hose and you have a chance it an increase.

[spoolinrs6]

i believe this is a pic of my car. does it have fmics?


The side vents on my hood are directly over where the filters are located on the Dahlback intake (see pic below, outlined in red). Usually i hear that the Dahlback intake isn't great because it sucks in plenty of hot air - but if i have my vents located directly above the filters, does anyone think i would get enough gains (if any) out of it to install the intake?

http://i181.photobucket.com/albums/x239/slikjoseph/intakehood.jpg (http://s181.photobucket.com/albums/x239/slikjoseph/?action=view&current=intakehood.jpg)

[JSRS6]

I'd say about 99 percent of rs6's have smic's(side mount intercoolers) except for THIS guy:

Http://youtu.be/rLzNOficZaw

i believe this is a pic of my car. does it have fmics?

[JSRS6]

Shit. You bought that car. You have a front mount.

[spoolinrs6]

yes i currently own this car it has front mount intercoolers coming out of the bumper. there is only 2 in the whole US that have it and the other guys rs6s fmics are behind his grills mine pop out. i believe the owner before me was from ny and never took care of it. for the past 3 years ive owned it i took well care of it and now its in showroom condition with 50k miles. i only use it for shows. if i can upload a pic of it on here i would but it wont let me. you can go on my IG if you want @spoolin_rs6


I'd say about 99 percent of rs6's have smic's(side mount intercoolers) except for THIS guy:

Http://youtu.be/rLzNOficZaw

[JSRS6]

I know this sounds ominous, but...

...im following you.

[spoolinrs6]

haha interesting if you follow me and you have an rs6, ill most likely to follow you back. whats your IG?


I know this sounds ominous, but...


...im following you.