David Beale

Maurice quoted someone else about $435 US plus $27 shipping. That's for the one I have - 5" cat. with O2 bung for a wideband and installation kit. See the pic. above. There was no resonator. E-mail maurice@harddata.com and he'll quote you.

MichaelFregoe

iTrader: (1)

Pipe. polished #304 Stainless steel, 5" metal wound cat, hangers and
fittings/install kit and 18mm O2 bung behind the cat: $420

2 on hand, more available in 10 days ( build just started on next
batch).

I did some checking today after we talked.
The space for the resonator is very tight, and after going over it with
Random, we think the best bet is to put the resonator separaely,
further
back on the pipe.

We offer a 9" long, 3" ID resonator for this purpose at $95
It come with one end male sleeved, and the other end female sleeved.

Scrub

iTrader: (25)

Just out of curiosity, do you know what the cells per square inch is on that converter?

-Dan

MichaelFregoe

iTrader: (1)

Check the Random web site, as they are the manufactures of the units.

MichaelFregoe

iTrader: (1)

This is from an Australian website. It compares backpressures associated with their catalytic converters and a stock converter. This should be similar to what Random is producing.

METALLIC SUBSTRATE CONVERTER - MAZDA RX-7

"Metallic substrate converters give an exceptionally high flow rate for their size compared to traditional ceramic core converters, for example the back pressure in the header pipe with a conventional hi flow cat fitted is around 4psi with a metallic substrate it is around 1.5psi (see converters for flow rate comparisons) full stainless steel construction. "

http://www.smb.net.au/fullsystemsmazdarx7.htm

MichaelFregoe

iTrader: (1)

http://www.randomtechnology.com/technical.html

MichaelFregoe

iTrader: (1)

Sorry to revive such and old thread, but I finally got around to installing the Random Technology metallic substrate catalytic converter on my car. I have a Pettit intake and ported motor, 99 SPEC turbo’s and a huge custom intercooler. The exhaust on my FD before the installation consisted of a Pettit down pipe, stock catalytic converter and Racing beat dual tip cat-back. I replaced the stock converter with the metallic substrate unit after welding the new unit together (It comes in two pieces, with a giant clamp). It also comes with a bung for a wideband O2 sensor.

Let me start by saying that the new converter FLOWS! Wow! I turned the boost controller all the way down and I still experienced boost creep starting at 10 PSI @ 5K RPM up to 14 PSI at 7500 RPM. I had to install a 2.5 inch restrictor in the exhaust to keep things under control. At idle and cruising the car is almost exactly as quiet as it was before. At WOT it screams like a have a straight though mid-pipe. Inside the car the sound level was identical.

There is a little “stink” out the tailpipe now, but not anywhere near what it was when I had a straight through mid-pipe on the car. The A/F ratio leaned out a bit (.2-.3) but I am well within safe limits. In fact the car runs very rich with the Pettit ECU I am currently running……at WOT with 12-13 PSI it runs 10.6:1.

Currently with the restrictor plate I can maintain boost perfectly at 13 PSI all the way to redline. I am going to make some changes to the boost controller tonight so I can adjust boost back to 10 PSI where I always run the car. I could most likely increase the size of my restrictor to 2 5/8 inches without any difficulty. I’ll do that after I get the boost where I want it, so that any changes will be apparent.

axr6

I had the same boost creep response after installing my Davesport metallic cat. They just flow much more than ceramic high flows. Instead of the restrictor plate I used a set of Supertrapps at the exit pipe to exactly control the needed back pressure. I did not feel good about putting in an arbitrarily smaller restrictor plate.

What I had found is that I just needed a very tiny amount of additional back pressure that can be achieved just by the presence of the Supertrapp plates but, without the usual back blocking plate. It also helped to lower the sound levels as a side benefit. Other than the fact that some people may find it ugly, it works great for me as I can control the boost creep by adding or taking out plates as required by ambient temperature conditions.

Needless to say this solution only works on single exit exhausts, particularly with the large exit pipes, such as my Corksport exhaust have.

I also welded in an air pipe in hopes of passing CA emission with this cat.

Albert

MichaelFregoe

iTrader: (1)

I changed some settings on the Profec and now maintain boost perfectly @ 11 PSI all the way to redline. Now I'll increase the size of the hole in the restrictor untill I get the perfect balence of boost control and flow.