Notices
Series I Aftermarket Performance Modifications Discussion of power adding modifications

Exhaust Cut-Out - Performance/Sound?

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old 10-12-2005 | 11:31 AM
  #1  
Imidazole's Avatar
Thread Starter
Registered User
 
Joined: Jan 2005
Posts: 375
Likes: 0
Exhaust Cut-Out - Performance/Sound?

Those electric cut-outs arent very expensive. Supposing I installed one before (or after) the cat... any opinions on how the car would perform?

What about sound?

Thanks
Old 10-12-2005 | 11:49 AM
  #2  
StealthTL's Avatar
Metatron
iTrader: (1)
 
Joined: Mar 2003
Posts: 7,284
Likes: 175
From: A Pacific Island.
Insane.....

The raw tone of the unmuffled/unresonated rotary exhaust is nasty, and INSANELY loud. There is also virtually zero power to be made from opening it up.

It's not like a V8 running thru open headers, there is no rumble or growl to it - just an angry raspy "blart" noise!

Before you even consider a cutout, break the middle joint in the exhaust, the one with spring bolts, (careful not to lose the gasket - you'll need it when you have to put it back together) then take it around the block. Then decide if you could live with that, even part time.

Another point about cutouts is they rarely seal off completely, so your car always sounds like it has a hissy little manifold leak.

S
Old 10-12-2005 | 12:07 PM
  #3  
Imidazole's Avatar
Thread Starter
Registered User
 
Joined: Jan 2005
Posts: 375
Likes: 0
Damn. I cant think of what to do to my 8 then, that wont cost an assload with little to no gain.
Old 10-12-2005 | 12:17 PM
  #4  
expo1's Avatar
He's as bad as Can
 
Joined: Feb 2004
Posts: 4,309
Likes: 2
From: Manchester, NJ
Originally Posted by Imidazole
Damn. I cant think of what to do to my 8 then, that wont cost an assload with little to no gain.

At least you came to that realization before spending a bunch of money:D, Go pay for some track time, that’s a good place to spend some bucks.
Old 12-30-2005 | 01:43 PM
  #5  
Beodude123's Avatar
Banned
 
Joined: Oct 2005
Posts: 189
Likes: 0
From: Ely, UK
Alright, I know you guys touched on this previously, but I know that when you take off the exhaust about a foot or two after the cat, you really change the powerband.

I took the exhaust off my Escort to get it copy-bent and it really pulled in the upper rpms. Also it would carry power well after the cam would fall off... I know it doesn't apply to the rotary since it has no cams, but it would still increase the top end an awful lot wouldn't it?
Old 12-07-2007 | 10:15 PM
  #6  
9krpmrx8's Avatar
SARX Legend
iTrader: (46)
 
Joined: Jan 2007
Posts: 33,786
Likes: 455
From: San Antonio, Texas
Back from the dead. Has anyone ran cutouts at the track?
Old 12-08-2007 | 02:43 AM
  #7  
N rider89's Avatar
^NieL
 
Joined: Oct 2005
Posts: 2,560
Likes: 1
From: santa clara ,ca
Originally Posted by expo1

At least you came to that realization before spending a bunch of money:D, Go pay for some track time, that’s a good place to spend some bucks.
wise words
Old 12-08-2007 | 08:43 AM
  #8  
9krpmrx8's Avatar
SARX Legend
iTrader: (46)
 
Joined: Jan 2007
Posts: 33,786
Likes: 455
From: San Antonio, Texas
^ Agreed.

I realize cutouts would make the 8 sound like **** but if you did it before the mufflers I cannot see how it wouldn't increase power output.
Old 12-08-2007 | 08:53 AM
  #9  
w0rm's Avatar
PUSHER ROBOT
 
Joined: Sep 2004
Posts: 655
Likes: 0
From: Norman
Revved it while changing my midpipe with nothing hooked up.. I'm sure it woke the neighbors, and I was in a garage..
Old 12-08-2007 | 01:09 PM
  #10  
lone_wolf025's Avatar
Future Rotary User
 
Joined: Oct 2006
Posts: 567
Likes: 0
From: Chicago, IL
Don't bother with cutouts. Even if you can stand the noise, you'll still be lucky if they last more than 6 months.
Old 11-29-2008 | 08:03 PM
  #11  
9krpmrx8's Avatar
SARX Legend
iTrader: (46)
 
Joined: Jan 2007
Posts: 33,786
Likes: 455
From: San Antonio, Texas
FYI, back from the dead again but my friend has been running cut-outs on his S2000 for the last six months at the drag strip and there is no leakage. I don't know the exact numbers and I know you cannot compare a S2000 to a RX8 but he did see a significant gain on the Dyno. His are manual cutouts (held on by wing nuts).
Old 11-29-2008 | 08:41 PM
  #12  
Easy_E1's Avatar
Registered
iTrader: (2)
 
Joined: Sep 2005
Posts: 7,675
Likes: 5
From: Bellevue WA
I had a cutout on my74 RX4 and was on the track one day. My buddy in the stands heard the announcer say that my car "sounded like a low flying P-51"

I was so happy.
Old 11-29-2008 | 08:45 PM
  #13  
9krpmrx8's Avatar
SARX Legend
iTrader: (46)
 
Joined: Jan 2007
Posts: 33,786
Likes: 455
From: San Antonio, Texas
You should hear a S2000 with cutouts, hahaha. I imagine a RX8 with cutouts would be insane. The question would be where to put them.
Old 11-30-2008 | 08:43 AM
  #14  
Saphus's Avatar
Registered User
 
Joined: Apr 2008
Posts: 145
Likes: 0
actually... i cut the muffler off of my 8 and ran a center straight pipe... theres another guy here in tulsa I got the idea from who just cut off his muffler... truth is... it sounds VERY good... and everyone who hears it, from M3 drivers to civic riceboys say the same thing...
Old 11-30-2008 | 09:29 PM
  #15  
kersh4w's Avatar
Hit & Run Magnet
iTrader: (3)
 
Joined: May 2007
Posts: 6,690
Likes: 3
From: DC Area
because i didnt have bolts, i ran with my midpipe disconnected from my cat. below 5.5k rpm it sounded pretty.. i dunno, ricey, not ok. whatever. above 6k ... man that thing sounded beautiful.

also, a cutout will cause you to lose torque and gain a few top end ponies in v8. in rotary, i dunno. but i do know we cant afford to lose any torque as it is. cutouts = no. my friend has one in his camaro, and the difference between open and shut is pretty crazy. a lot like the difference between whether the silencers are on or off with my turboxs headerback exhaust. except he can do it with the touch of a button. handy.

and jeez, i cant stand the popular misconception that bolts do do jack ****. thats just not true. im personally crusading against that paradigm.

you want horsepower, fine, here we go. this is my personal knowledge, and im sure similar products will be fine.

turboxs headerback. full 3" exhaust and test pipe starting at the header. ~10whp $500
my intake is custom. but any decent intake + racing beat duct. or the mazdaspeed/AEM. ~5whp $200+
cobb accessport ~10whp $700

get those 3 mods and you'll be adding at least 15whp. if not more. supposedly the BHR ignition adds 8whp. and @ $375 thats not a bad buy, but i cant comment personally on that. spend 2 grand and you might pick up 30whp, especially if you have your car tuned. and why not throw some RB or fluid motorsports headers in there for good measure.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Hunterkelley24
Series I Engine Tuning Forum
14
06-14-2022 08:32 AM
arexatemate
RX-8 Parts For Sale/Wanted
6
10-28-2019 08:16 AM
mdl0209
Series I Trouble Shooting
14
05-23-2019 05:46 PM
fourwhls
RX-8's For Sale/Wanted
7
02-20-2019 05:16 PM
Jb4ker96
Series I Trouble Shooting
0
09-27-2015 10:06 PM



You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: Exhaust Cut-Out - Performance/Sound?



All times are GMT -5. The time now is 09:17 AM.