Smelly Clothes
04-11-2005, 08:09 PM
#71
Senior Member
Join Date: Jun 2003
Location: NYC+LI
Posts: 101
I had this thread going on rx7club and thought I'd update you guys as well.
I wanted to give you guys an update on my custom Metal Substrate High Flow Cat.
The product:
I received the Random Technology (http://randomtechnology.com/) universal fit Metal Substrate Cat last week. I was kind of surprised how small and light it was compared to a stock cat. It is 4" in diameter and roughly 9" in length. The inside of it looks like a mesh filter. If you hold it up to sunlight you can see the light through the metal substrate mesh. The metal substrate looks like it is crimped in place. Looked pretty solid and well made. Nothing rattling around or anything.
The install:
I headed over to my local RX7 specialist (J&R Performance) to get it welded into the 3" midpipe that was already on the car on Saturday. Installing it was pretty straightforward since they had the right tools They measured it against the midpipe, marked it and cut using their electric cutter jimmy jammy tool. I would never ever want to try cutting through one of our midpipes by hand! Then they tacked it in place, pulled the midpipe off an welded it on.
The cat is supposedly designed to slip over the 3" midpipe up front and slip in the 3" midpipe out back. However, since rotary midpipes/exhausts use such thick walled steel it would only slip over the front of the midpipe. So they made a nice even bead along the mating surface in the rear. They had to be careful (read: warning for you guys) with the welding as the metal used for the external part of the cat is much thinner and will quickly get screwed up if you are a sloppy welder. They did an excellent job of installing welding it in place and got us out of their quickly. Much thanks to Joe and the boys!
Results so far:
The car is quieter compared to running a straight midpipe but not as quiet as the stock cat (no surprise there). The tone of the exaust (Racing Beat duals) sounded very similar just a few decibels quieter. It smells MUCH better. Midpipes and resonated midpipes are kinda cool, but smelling like exhaust sucks (unless it smells like the mid-90s F1 fuel) and the ladies hate it.
Next week, the car will be getting put on the dyno for some tuning so I'll probably have a sheet for you with this car. Week after, it's going to get emissions tested. Not really sure if it will pass, but worth a try.
I'll keep you informed about how it progresses.
Details of the car it went on are: street-ported motor, Jspec twins, Greddy FMIC, PowerFC, DP, RB cat-back and other goodies.
Pretty freakin nice overall me thinks.
I wanted to give you guys an update on my custom Metal Substrate High Flow Cat.
The product:
I received the Random Technology (http://randomtechnology.com/) universal fit Metal Substrate Cat last week. I was kind of surprised how small and light it was compared to a stock cat. It is 4" in diameter and roughly 9" in length. The inside of it looks like a mesh filter. If you hold it up to sunlight you can see the light through the metal substrate mesh. The metal substrate looks like it is crimped in place. Looked pretty solid and well made. Nothing rattling around or anything.
The install:
I headed over to my local RX7 specialist (J&R Performance) to get it welded into the 3" midpipe that was already on the car on Saturday. Installing it was pretty straightforward since they had the right tools They measured it against the midpipe, marked it and cut using their electric cutter jimmy jammy tool. I would never ever want to try cutting through one of our midpipes by hand! Then they tacked it in place, pulled the midpipe off an welded it on.
The cat is supposedly designed to slip over the 3" midpipe up front and slip in the 3" midpipe out back. However, since rotary midpipes/exhausts use such thick walled steel it would only slip over the front of the midpipe. So they made a nice even bead along the mating surface in the rear. They had to be careful (read: warning for you guys) with the welding as the metal used for the external part of the cat is much thinner and will quickly get screwed up if you are a sloppy welder. They did an excellent job of installing welding it in place and got us out of their quickly. Much thanks to Joe and the boys!
Results so far:
The car is quieter compared to running a straight midpipe but not as quiet as the stock cat (no surprise there). The tone of the exaust (Racing Beat duals) sounded very similar just a few decibels quieter. It smells MUCH better. Midpipes and resonated midpipes are kinda cool, but smelling like exhaust sucks (unless it smells like the mid-90s F1 fuel) and the ladies hate it.
Next week, the car will be getting put on the dyno for some tuning so I'll probably have a sheet for you with this car. Week after, it's going to get emissions tested. Not really sure if it will pass, but worth a try.
I'll keep you informed about how it progresses.
Details of the car it went on are: street-ported motor, Jspec twins, Greddy FMIC, PowerFC, DP, RB cat-back and other goodies.
Pretty freakin nice overall me thinks.
04-11-2005, 08:22 PM
#72
Senior Member
Join Date: Jun 2003
Location: NYC+LI
Posts: 101
One more thing I thought I'd mention since lots of yuse single turbo guys are running Haltechs and other EMSes...
Apparently Joe and the boys are working on a "black box" electronic OMP controller to work hand in hand with Haltech, Microtech and I think Autronic. The idea is to grab signal from the respective engine management system and activate the stock OMP to flow the proper amounts of oil to the rotors. This will eliminate the need for Premixing and other annoyances like that for those running those EMSes.
I could probably rattle on about other **** I saw there, but I got other things to do right now
Keep em spoolin fellas
Apparently Joe and the boys are working on a "black box" electronic OMP controller to work hand in hand with Haltech, Microtech and I think Autronic. The idea is to grab signal from the respective engine management system and activate the stock OMP to flow the proper amounts of oil to the rotors. This will eliminate the need for Premixing and other annoyances like that for those running those EMSes.
I could probably rattle on about other **** I saw there, but I got other things to do right now
Keep em spoolin fellas
04-12-2005, 01:05 PM
#73
Senior Member
Join Date: Jun 2003
Location: NYC+LI
Posts: 101
Originally Posted by maxcooper' date='Apr 7 2005, 02:21 AM
I haven't compared the substrate pics very carefully yet, but my first impression is that they really do look similar. Anyone want to count some rings?
-Max
They metal substrate cores are 300 cells per inch on both the Dynatech and Random cats.
04-12-2005, 08:22 PM
#76
Senior Member
Thread Starter
Join Date: Jan 2003
Location: union, new jersey
Posts: 8,079
from what i saw of the random technology cat and this one... (i examined one yesterday)
they have the same substrate.... the construction fo the random tech is far superior though, the reducers are more gradual and shinier...
if you notice there is an abrupt curve where the cat ends... and there is a very sharp corner where the two tubes meet the cat section.
they have the same substrate.... the construction fo the random tech is far superior though, the reducers are more gradual and shinier...
if you notice there is an abrupt curve where the cat ends... and there is a very sharp corner where the two tubes meet the cat section.
