Exhaust cut outs - worth the tuning work?
#1803046
04/14/15 06:12 AM
04/14/15 06:12 AM
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Joined: Jan 2003
Posts: 3,943 Melbourne.....Oz-land
Moparmal
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
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Ive had Max Wedge type cut outs for a few years...but gave up on using them at the track years ago because of the tuning demands going from street to track.
Im wondering what sort of improvement this type of mod would show if I persevered and decded to start using them again.
- Is the loss of back pressure a deal breaker for any performance gain?
- Is it worth the hassle with a 450hp motor/3500lb car?
- Im running fairly small mid pipes appx 2.5"... but the mufflers are Magaflos...again....is it worth changing my track tune?
Last edited by Moparmal; 04/14/15 06:14 AM.
67 RO23 clone with 6.1 SRT Hemi and dual quads. Soon to have Drag Pak induction and Throttle body.
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Re: Exhaust cut outs - worth the tuning work?
[Re: Moparmal]
#1803071
04/14/15 09:34 AM
04/14/15 09:34 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I bought electric dumps for my Rampage.. I put muffs on that were quiet enough that I didnt mind driving it but the back pressure went up.. so now I use the dumps to lower the back pressure... I'll open them at the track... these are 3" dumps and a 3" exhaust with dynaflow muffs
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Re: Exhaust cut outs - worth the tuning work?
[Re: MR_P_BODY]
#1803111
04/14/15 10:55 AM
04/14/15 10:55 AM
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Joined: Jan 2003
Posts: 17,924 Akron, Ohio
ProSport
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,924
Akron, Ohio
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That's how mine is, one momentary switch. Should be fun!
1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
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Re: Exhaust cut outs - worth the tuning work?
[Re: Moparmal]
#1803117
04/14/15 11:10 AM
04/14/15 11:10 AM
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Joined: Jan 2003
Posts: 12,256 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,256
Benton, IL.
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Cut-outs have made a huge improvement on every car I have put them on. But there are no tuning differences. Light and part throttle are unaffected by them and why would you have them closed when opening the throttle? You don't have to open them all the way, just enough to let some of the pressure (and decibels) out.
In fact, I often have them cracked open a bit when going to car shows and such. Everyone looks as you pull in, but it is not so loud as to be obnoxious. The fun factor is even greater than the gain in performance for me and I have said here several times that I will never have another muscle car without cut-outs. Even if it is a mild build because they are a lot of fun.
Master, again and still
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Re: Exhaust cut outs - worth the tuning work?
[Re: Moparmal]
#1803141
04/14/15 12:07 PM
04/14/15 12:07 PM
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Joined: Jan 2003
Posts: 8,035 Tulsa OK
Bad340fish
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master
Joined: Jan 2003
Posts: 8,035
Tulsa OK
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I need to find a good spot in my exhaust to put some cutouts, I feel the full exhaust is holding my car back some considering it picked up a few mph with just a muffler change. Changing the mufflers also fixed the reversion and black intake manifold I had as well.
My driveway sucks so I have to be real careful about ground clearance, not sure I can squeeze any of those electric ones in there.
68 Barracuda Formula S 340
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Re: Exhaust cut outs - worth the tuning work?
[Re: Bad340fish]
#1803150
04/14/15 12:21 PM
04/14/15 12:21 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I need to find a good spot in my exhaust to put some cutouts, I feel the full exhaust is holding my car back some considering it picked up a few mph with just a muffler change. Changing the mufflers also fixed the reversion and black intake manifold I had as well.
My driveway sucks so I have to be real careful about ground clearance, not sure I can squeeze any of those electric ones in there. I have the motor section of the dumps pointed upward at about a 30* angle just for road clearance... I did put the down spouts on the outlet but I have them pointed inward so they arent a clearance issue.. when I hit the track in a few weeks I'm gonna do a open/close test just to see the difference in ET/MPH.. I expect to see a decent difference... and I'm too lazy to pull the exhaust off or even get under there to manually pull caps off... flip the switch... done.. that works for me.. LOL
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Re: Exhaust cut outs - worth the tuning work?
[Re: MR_P_BODY]
#1803169
04/14/15 12:56 PM
04/14/15 12:56 PM
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Joined: Jan 2003
Posts: 8,035 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,035
Tulsa OK
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Wade Metzinger has a 68 Barracuda will a full 3" mandrel exhaust system. That car picks up 3 tenths with the exhaust off, so call it .25 for the weight difference of the system. I have a crappy 17 year old muffler shop bent 3" system that goes to 2.5 for the tails. I am sure its costing me something, how much I don't know but hope to find out soon.
68 Barracuda Formula S 340
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Re: Exhaust cut outs - worth the tuning work?
[Re: gtsdude]
#1803246
04/14/15 02:13 PM
04/14/15 02:13 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I went from a 3.5" collector to a 3" cut out and 3" all the way to the rear.. my muffs are 3" in and out and mounted at the back bumper ... I installed the cut outs pretty close to the collectors then the H-pipe after the cut outs.. I was running out of room to put the H-pipe prior to the cut outs
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Re: Exhaust cut outs - worth the tuning work?
[Re: MR_P_BODY]
#1803273
04/14/15 02:46 PM
04/14/15 02:46 PM
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Joined: Jan 2003
Posts: 9,888 Weddington, N.C.
Streetwize
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Posts: 9,888
Weddington, N.C.
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If you have cut outs you can easily fab up a short flanged U to serve as an H pipe for normal driving or bridge an H pipe across it and either remove it or extend the blind flanges to the back of the H, you don't need much more than 5-6" of overall length so it doesn't add much at all in the way of weight.
Last edited by Streetwize; 04/14/15 02:46 PM.
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Re: Exhaust cut outs - worth the tuning work?
[Re: Streetwize]
#1803299
04/14/15 03:16 PM
04/14/15 03:16 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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If you have cut outs you can easily fab up a short flanged U to serve as an H pipe for normal driving or bridge an H pipe across it and either remove it or extend the blind flanges to the back of the H, you don't need much more than 5-6" of overall length so it doesn't add much at all in the way of weight.
I dont have any issue.. but I would have liked it before the cut outs.. but it is what it is
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Re: Exhaust cut outs - worth the tuning work?
[Re: Paul_Fancsali]
#1803515
04/14/15 07:37 PM
04/14/15 07:37 PM
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Joined: Jan 2003
Posts: 8,035 Tulsa OK
Bad340fish
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master
Joined: Jan 2003
Posts: 8,035
Tulsa OK
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Anyone have an idea as to what a full exhaust system from headers to mufflers weighs?
68 Barracuda Formula S 340
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