I've tired both a filter and the metal screen on my set up. Honestly I only use the filter for when im driving the car on the road. When I race down the track its with the screen only. I was thinking that it was helping the flow but the more im told and read, it is in fact more restrictive then anything. Any thoughs on this idea and first hand stats to prove the difference.

In you guys opinion would this filter or this screen flow better. I will have to try it out at the track in the upcoming week to see if theres a difference. But I just wanted a little info on the fundimentals.


Or this(metal screen)



Thanks for looking at the thread!

 

No one?

 

filter on the street and nothing at the track.
thats what i always did and never had any issues

filters are restrictive and so are mesh screens

the chance of kicking up a stone into the turbo at the track is very minimal

 

I don't run a filter at the track, never had a problem. Not even with my bug catchers.

 

My couple of penny's worth, the screen is likely restrictive as there isn't a lot of area. If you could build a frame like the size & shape of the cone filter and use screen over it, it would be better.

Or even something that is just round, coffee can size, and use a screen. I've taken an old air cleaner filter and cut out the paper and the screen on the inside, leaving the outer screen in place.

I'm going to go against the grain here and state no-way would I run nothing at the track. Why risk a turbo and engine for a tenth or two. All it takes is one little item ingested to ruin the night/day and after.

RBob.

 

at the track u ar mor elikley to pick up something smaller then the mesh is he running then a much larger pebble.

countless ppl have run superchargers and turbos at the track with nothing on the inlet and never had an issue.

if he had a low mounted turbo i wouldnt suggest it but his inlet is pretty much in the battery tray, it would be about a 1 in 2 million chance of a rock getting kicked up in there.

i used to have a chart somewere that showed just how restrictive diff filters and wire mesh screen actually are ill have to dig threw my photobucket and find it


btw fast if u want to pick up an additional 2-4 tenths pick up a velocity stack for the turbo inlet i think they are going for around 35 bucks on fleabay for a 3 inch one

 

I've got personal experience with this. Without an air filter, or rather, without an AIR INLET DUCTING, you will generally make less power.

Dyno proven experience here talking. If you remove your air filter and inlet assembly, your turbocharger will generally move a bit less air and you will make less power- Assuming the air filter is not restrictive. It appears that having a "column of air" well defined before the compressor inlet will improve compressor flow.


Not to mention that it's insane to run without an air filter to begin with. Do you care about your engine? Even "clean" air contains dirt and crap that will coat your plumbing, coat your internals, it will gradually make a mess, it is just bad for engine health and longevity in general. be safe!

 

Look at my old setup with the twins sticking out of the hood in sig pic below.... talk about cold air intake!

I ran with and without filters back to back many times and NEVER saw a difference in ET or MPH. This is on a 9 second/low 10's car setup. ONLY thing changed was a increased in turbo sound which was cool in its own right so I always ran without a filter on it at the track just to hear it whistle dixie.

that being said, I dont think your setup is allowing fresh air to the turbo and running no filter will just have hot engine bay temps enter in. Hot air in = hotter air out after compression.

I'd run a large intake pipe under the car thru the battery box area if you can and test it with and without a large cone filter. I ran AEM Dry Flow's in 3.5" inlet size and could have fit a 4" but saw no loss with those smaller filters. I think they are only 6-7" long


And race cars run no filter all the time and have no issues... track environments are surprisingly clean or atleast in my experience...theres little in the ways of trash on the track or even bugs flying around at night over the lanes... cars flying down the track with rubber smoke and exhaust fumes and etc tend to eliminate bugs...and even if a few exist, they arent going to be killing motors anytime soon. They go splat and juices go into the turbo...consider it water injection

 

As of now I leave the filter off at the track, just because. And anyother time I leave my air filter on it. Ive got the car being a alcoholic now so the intake temps are below ambient for the most part with boost.

I do need to make a better route though to gather that fresh cool air like you said. Thats the next pproject after I tackle what im doing now.

 

figures this would get bumped, i just ordered 2 of these for my tt iroc

http://www.ebay.com/itm/POLISHED-3-V...sories&vxp=mtr

velocity stacks have proven gains on turbo/supercharged engines , fast id grab one of those and mount it on the turbo inlet and leave it like that for the track