TWM Stack Air filter

[aldersonjames20]

Rwillia4,

Yes, I am stacked to the max. They look a lot bigger than they really are, at least from a height perspective. They are only 4 inches high, but they were custom spun to match the 56mm throttle bodies, so they are much wider than the average stack, making them look huge.

I have talked to a few smart guys about this filtering problem, and what they all told me was that you can either breathe well, or look good, there is nothing in the middle. My big filter box (as well as that one from TWM) are ugly, but do what we ask of them very well, breathe and filter. Its like a woman, if you marry a super model, don't expect a home cooked meal waiting for you every night, but damn do they ever look good. So, I have decided to have the two solutions do what they are supposed to for their missions, and switch them out when I need them to change. I will keep the ugly but efficient solution for the track, and individual filters for normal driving where I don't need all the HP. I also am having a machine shop build me some brackets that take the angle out of the stacks at the throttle body. They will basically staighten the stacks so they look more weber like... I know it will screw air flow a little, but the stacks on these systems don't do much but staighten/speed up the air and look good, but they are not required by any stretch of the imagination. I also think this will require two different tunes of the ECU to be switchable as well. 98% of my driving will be on the street with only the occasional WOT, so I won't be switching them around every day or anything. This is based on the advice I have recieved from several people. I actually thought long and hard about pulling the EFI off the car and going back to a carb, although a VERY good one like the Barry Grant Race Demon... but I can't do it.

This is a copy of a chassis dyno done to compare the old Might Demon 850 carb with Victor Jr. intake to this efi setup on the exact same setup in my car. The lines are a little wobbly because the injection and spark curve tune were not perfect (not even close) when I got the car. Much smoother now, but my ECU is a MegaSquirt which works but will be replaced with a Haltech when my wife gives me back access to our account...lol.



With some recent drivetrain efficiency improvments, I am guessing I am 580-600 HP at the engine.

Anyway, sorry for the ramble, but I have spent entire days looking for a solution to this same filtration problem and talked to lots of folks. I have one last shop to talk to that will certainly have lots of experience in this stuff... Holman Moody.. 10 mines from my house.

James

[CobraV8]

Well there actually is a third solution: incorporate the filter housing in the air scoop, so you'll have filtration and enough airflow when the car is driven, and uncovered, shiny stacks when you open the hood.

Look at this picture from the CC galleries:



However this will only work for straight stacks.


James, why do you want to replace the Megasquirt? I'm having a stack injection setup here waiting to be installed, and I planned on using the Megasquirt as it seems cost effective and user friendly.

Simon

[Hankcar]

This picture was taken at Santa Barbara Wheels and Waves car show. The guy that makes the Roush filters is
Clay Cook
C. Cook Enterprises, Inc.
Ph: 859-282-7545 x. 105
Fax: 859-282-7566
www.ccookent.com
I have pictures in my computer but I don't know how to post them here

Originally Posted by CobraV8

Well there actually is a third solution: incorporate the filter housing in the air scoop, so you'll have filtration and enough airflow when the car is driven, and uncovered, shiny stacks when you open the hood.

Look at this picture from the CC galleries:



However this will only work for straight stacks.


James, why do you want to replace the Megasquirt? I'm having a stack injection setup here waiting to be installed, and I planned on using the Megasquirt as it seems cost effective and user friendly.

Simon

[Rwillia4]

I will give the Mr Cook a call. How do you think it will work with engine movement?

Thanks for the info
Rob

[Cracker]

This is an interesting topic. For a few years now I have given thought to developing an effective filter housed within the airhorn but like most "ideas" the demand is simply not there to support the development costs. I took a look at the individual filters by Roush - they are ugly like everything else that people put on these Webers/Injection units.

I ran my 48 IDA's with nothing and had no adverse effects but long term I wouldn't feel comfortable doing that. A Weber stack draws it's flow from the center and therefore makes it a challenge to design a semi-hiddin (non tumor like growth atop the beautiful stacks). It CAN be done and will be by someone with more money and time than most of us. Anyone looking to throw a 150K into development and sell these buggers for $30 a pop get in touch with me. You might have your investment back within 30 years.

[Hankcar]

you can also do these type of screens with your TWM kit.
http://www.twminduction.com/v8_kits/427.html

[fastrods]

If there is a lot of interest, I will have these made:

[btsai]

Check out this solution on a coupe. The workmanship was beautiful.

The reddish areas were rubber that was flexible and allowed a bit of overlap (about 1/4") for "wiggle room" when resting on top of the velocity stacks. The long tubes lead to twin, cone-shaped K&N filters.

[traindriver]

Snakebit,

I have tried the slip on 'pantyhose' type covers...

On my 351 they do depress in in the middle when you gun the throttle...No fear of ingestion though. The bad news...at 4500 rpm it starts running real fat....very noticable. I used to have a racing go-kart with a huge stack on it, we literally used "leggs" pantyhose and electrical tape..no effect..I might try that as an experiment when my wife isn't looking.

Chuck

[lamaluv]

I finally got to try the different filters for my fuel injection on the dyno. The chassis dyno was not working properly so I was only able to do comparitive runs to see how much difference there was in the two filters.


To my surprise there was only 5.2 HP difference. The tuner basically said that for all practicality they were both the same. This did not seem correct to me as with a carb you see a difference in HP by changing or eliminating the filters.




I called Bob Ream at Imagine Injection to see what the factory had found the difference to be. He confirmed my dyno results by saying their tests showed no difference in HP between either types of filters or no filters at all. He thinks that because the FI is controlled by the computer that is continually compensating for changes in air, fuel, temp, ect you don't see the differences in HP you see with a carb.

If there is no difference I just need to decide which to use. The small individual filters sure show off the injectors. I'm thinking thats the way to go, what do others think?

Dick

[Rwillia4]

If this is the case fro HP, I agree the small ones look better. Do they filter as well?