July 12, 2020, 05:22:12 PM

Author Topic: New muffler for the 427 going in  (Read 994 times)

Offline Exidous

New muffler for the 427 going in
« on: January 09, 2020, 02:45:49 AM »
I'm currently in Aus visiting my wife and Varex being an Aus brand is cheaper to buy here and bring back in your luggage. Ha

3.5" inlet with a 4" tip. The motor is controlled by a simple two wire and a pulse sequence for variability best I can tell. I should be able to get the ECU to drive it without their box.
94 BB Sleeved gen IV LS7, MS3ProU with TC, RONIN 8.8 and LT's with custom 3.5"single to VAREX muffler.

Offline MPbdy

Re: New muffler for the 427 going in
« Reply #1 on: January 09, 2020, 09:27:55 AM »
Nice! Jeff has a couple of those on JefeFD

Offline blacksi

Re: New muffler for the 427 going in
« Reply #2 on: January 09, 2020, 09:57:08 AM »
Can't wait to see it mounted and a video .  It looks really cool.

I have 2 different pipes I can mount up after the turbo, one is a straight pipe and one is a sectioned Greddy.  This looks like a much cooler option.

Offline digitalsolo

  • Administrator
  • Top Fuel
  • Location: Fort Wayne, IN
  • Posts: 23101
  • View Gallery
    • View Profile
    • LS1FC.com
Re: New muffler for the 427 going in
« Reply #3 on: January 09, 2020, 09:57:21 AM »
That's pretty neat.
Blake MF'ing McBride
1988 Mazda RX7 - Turbo LS1/T56/ProEFI/8.8/Not Slow...   sold.
1965 Mustang Coupe - TT Coyote, TR6060, modern brakes/suspension...  project car
2016 BMW 428i xDrive Gran Coupe - Completely stock...ish

Online wickedrx7

Re: New muffler for the 427 going in
« Reply #4 on: January 09, 2020, 11:18:55 AM »
I have been eyeing these for awhile. I am excited to hear how well they work for you. Why did you go with the round style verse the oval?

1993 Touring, 2012 L99, T-56, Ronnin 8.8, Ohlins, Speedhut, Samberg and lots of custom parts
Build Thread - http://www.norotors.com/index.php?topic=19354.0
Pictures - www.flikr.com/wickedrx7

Offline Exidous

Re: New muffler for the 427 going in
« Reply #5 on: January 09, 2020, 04:14:24 PM »
The round was the only one with a tip. The 3.5" oval was just a 3.5" out. I had thought about it but figure I'd try to keep a little of the JDM life going.
94 BB Sleeved gen IV LS7, MS3ProU with TC, RONIN 8.8 and LT's with custom 3.5"single to VAREX muffler.

Offline nadeem

Re: New muffler for the 427 going in
« Reply #6 on: January 11, 2020, 07:20:50 PM »
Very Nice

Offline kinger

Re: New muffler for the 427 going in
« Reply #7 on: January 13, 2020, 12:41:00 PM »
Sweet!  These are awesome little pieces.  Will you trigger it to open automatically or just a manual toggle? 
93 Touring, 6.3L, T56 Magnum, Mamo RPS BC2 clutch, FAST 90, NW 90TB TB, 8.8, samberg everything, AC, PS, TC, Cruise, LED Tails, HID head lights

Offline Exidous

Re: New muffler for the 427 going in
« Reply #8 on: January 13, 2020, 06:41:31 PM »
It's quite restrictive so I'll probably tie it to a separate fuel table in the ECU. Have not decided if it will be manual or auto yet.
94 BB Sleeved gen IV LS7, MS3ProU with TC, RONIN 8.8 and LT's with custom 3.5"single to VAREX muffler.

Offline Gunnytron

Re: New muffler for the 427 going in
« Reply #9 on: January 14, 2020, 02:20:59 AM »
I like the idea of these. I will be interested to see if it's teponsive enough to have an auto setup.
http://www.norotors.com/index.php?topic=12880.0
FD, LS1 running 220 3.90 Trickflow heads, Comp Ultra-gold Arc 1.72 Rockers, 7.550 BTR Pushrods, BTR Stage II NA Cam 227/234 .614"/.576" 113+2, ARP Head Bolts, BTR Platinum Springs, Ported FAST 90, NW 90mm TB, FAST 60lb Injectors, Textralia Clutch/Flywheel, T56, Cobra 8.8, 31 spline, trac-loc 3.55 Diff, Holley HP EFI, Racelogic TC.

Offline Exidous

Re: New muffler for the 427 going in
« Reply #10 on: January 14, 2020, 07:17:11 AM »
Without disassembly I think the motor uses a worm gear. I think I'll test it tomorrow. The control box just used a cigarette lighter.  Hopefully it's not too slow.

Video I found looks like <2sec full open to close.

I need to see if it has limit switches in the motor. If not it will need a timer to not burn the motor.
« Last Edit: January 14, 2020, 07:28:19 AM by Exidous »
94 BB Sleeved gen IV LS7, MS3ProU with TC, RONIN 8.8 and LT's with custom 3.5"single to VAREX muffler.

Offline Cobranut

Re: New muffler for the 427 going in
« Reply #11 on: January 14, 2020, 09:32:13 PM »
Without disassembly I think the motor uses a worm gear. I think I'll test it tomorrow. The control box just used a cigarette lighter.  Hopefully it's not too slow.

Video I found looks like <2sec full open to close.

I need to see if it has limit switches in the motor. If not it will need a timer to not burn the motor.

Often, this type of motor drive includes a current sensing circuit in the controller that detects the surge in motor current when it reaches it's end of travel and shuts it off.
Power windows are one of the most common applications of this method.
1995 FD, 7.0 Liter stroked LS3, T56, 8.8, Samberg kit.

Offline Exidous

Re: New muffler for the 427 going in
« Reply #12 on: January 15, 2020, 02:30:44 AM »
Looks like the power goes straight into the relay. There is no current sensing that I can see. None of the resistors are a shunt and there certainly isn't a hall sensor. I also checked the motor. No limit switches.
Looks like they just hoped folks wouldn't hold the button down.

Easiest route, setup a high current pair on the ECU tied to a timer. Hardest but most appropriate route, I build a current limit switch with reversing polarity.
94 BB Sleeved gen IV LS7, MS3ProU with TC, RONIN 8.8 and LT's with custom 3.5"single to VAREX muffler.

Offline wtfx100

Re: New muffler for the 427 going in
« Reply #13 on: January 18, 2020, 09:46:03 PM »
The amount of time to screw around with this would be less just to buy a spare motor.
If you can't tell when it's open or closed then u got some hearing issues ....
I have this in my evo wired up , but for the 427 fd i'll stuck with a spring pressure silencer

Offline Exidous

Re: New muffler for the 427 going in
« Reply #14 on: January 19, 2020, 05:32:44 AM »
I know I'll be able to tell but I want to skip the tacky key fob. I could just wire it to a switch and skip the RF portion of the board.
94 BB Sleeved gen IV LS7, MS3ProU with TC, RONIN 8.8 and LT's with custom 3.5"single to VAREX muffler.