This thread is in relation to the other one i posted up:
https://my350z.com/forum/intake-exhaust/289940-want-to-make-your-own-high-flow-cats.html

where it describes my quest to create High-Flow cats for my Twin Turbo application...Richey @ TechnoSquare was the Fabricator that welded the cats together for this project.

Last Friday i had the chance to use TechnoSquare's SuperFlow Flow Bench test equipment to see exactly how much flow the new HFCs would be.

I set up the Flow Bench Machine for baseline exhaust output to be 400CFM in 20inH20. They have a manual throttle body that is setup and a flange setup to accept many different types of cat pipes. The outlet on that flange was 2.167". Which is smaller than my turbo downpipes, but it was all they had at the time. Note: even with the machine dialed in for 400CFM, the actual output with nothing attached to the rigged throttle body/mounting flange was approximately: 318.0 CFM. Baseline # Loss is due to the throttle body device and all the mounting hardware. All numbers for the pipes should be compared to this to determine flow rate over an open system.

image of baseline setup:



This is the order of which i ran the tests:
(Right mouse click and Save TARGET AS please, to watch the Video of the test. Use Windows Media Player, as they are .wmv files)
Open (baseline)
OEM Cat
Test Pipe (2.25")
TechnoCat (2.75")

I ran each of the pipes five times and then averaged the peak CFM numbers:
Open (baseline): 318.0 CFM
OEM Cat: 143.2 CFM
Test Pipe (2.25"): 266.3 CFM
TechnoCat (2.75"): 306.8 CFM



I was quite impressed with the numbers... The test results showed that the 2.75" HFC retained 96.5% of the baseline flow; over double the flow rate of the OEM cats; and was even flowing BETTER than a 2.25" test pipe... for an even more extensive test, i wish i had a 2.5" test pipe to compare to..

the exhaust on my car (Greddy EvoTT) is significantly quieter now and best yet: NO MORE FUEL SMELL!! My Boost levels are still the same as they were when i was running the 2.25" test pipes, now just need some more road time to see how well the Cells hold up.

These were the first pair of TechnoCats made, there are a little tweaks here and there Richey would like to make, but if anyone is interested in these, please let me know! If there is interest they'd be more than willing to go into production.

thanks
--Cheston

 

looooooooking good!

 

wow thats very impressive. Im sure alot of the FI guys will consider these HFC's.

 

Id be interested but only if there is a set of O2 bungs in front of the catalyst as well as the standard in the rear. That way us FI guys get a true AF before the catalyst gets a hold of the exhaust and we still have the stock O2 position.

 

Those are actually the same CATS the Magnaflow and many others use. I can't remember the actual manufacturer though right now.

This is also the same as the Fast Intentions HFC's. Fast Intentions also has the 300 Cell metallic CATS for FI purposes. I'm not sure how your going to re-create the wheel here though.

Rick

 

How big is the hole in the adapter on the flow bench. This is one of those really informative threads. Everyone always says ya it flows more and for all the people who think "I wonder how much?" this is an answer. I would love to see this done for a stock and proflow ported throttle body. Even better yet a stock maf z tube and throttle body. Then a ported throttle body and a z tube with stock maf and then a 75 or 80mm maf. I got a stock and ported throttle body if you want to do this. I don't have mafs. I'll send you a modified stock cat to test as well. PM me if you have any interest.

 

a 2.75 would be too big for NA applications or no? I wouldn't mind getting HFCs over my test pipes eventually.

did you test out any comparable HFCs to see if your design gained anything over what they offer?

 

^^

unfortunately no, we just tested what we had available... it was mainly to see how 'high flow' these high flow substrates really are.

 

Looking good Cheston. Nice new options.

Chris

 

I don't think 2.75 would be too big for N/A at all...

 

quieter is good. i thought i would like having a loud car but its not all that its cracked up to be.

 

2.5 is the biggest you want to go on this engine. Truthfully 2.25 is big enough because it can flow more air than our engine can push in that size.

 

OK - so 2 1/2" is good for about 600HP - if FI, about 475-500 HP.

Rick

 

for N/A....

 

Right exactly. I meant to say that.

 

Thanks for the testing and write-up. I'm in the market for some cats. Was looking at the Fast Intentions but if your source can offer a competative price, then I'm in. I'm running JWT 530s and Stillen exhaust if that makes a difference.

 

I've seen a Shop use dual 2.75 inch pipes and lose nothing down low. Its not to big, thats a myth

 

Thanks for testing. Wish we had fast intentions hfc flow data to compare to! Anyone got a formula on how much airflow the engine produces relative to hp output at the crank?

 

What are the inlet and outlets of FI Ceramic HFC's?

Chestobo, I am interested. What would be the initial price? Thanks.

 

2.5" Od