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Re: The hot new trend --Thru fender exhaust
[Re: dvw]
#2483104
04/15/18 03:09 PM
04/15/18 03:09 PM
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Joined: Aug 2003
Posts: 43,355
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,355
Bend,OR USA
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My S/P car has 4.0 inch turn outs exiting under the front edge of the doors, Portland International raceway has a noise limit of 95 DB taken at the 330 lights on the drivers side of the track, my car is louder than that with the turn outs pointed out. The track manager suggested turning the drivers side turn out towards the passenger side, I did and that worked great   A lot of the NHRA S/G racers where pointing theirs both inwards to have them help cancel each side out as well as adding skirting onto the rocker panels to keep the noise under the car As far as warming up my car on E85 in the lanes, I don't  I drive it around the pits to get the engine oil, tranny fluid and rear gear oil warmed up before making a run
Last edited by Cab_Burge; 04/15/18 03:11 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: The hot new trend --Thru fender exhaust
[Re: bigdad]
#2483116
04/15/18 03:49 PM
04/15/18 03:49 PM
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Joined: Dec 2005
Posts: 11,780
Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,780
Fulton County, PA
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With a turbo up front, it makes sense to go through the fender or out from underneath up front. Zoomies are what they are. Nitrous? I wouldn't want a 5" flamethrower under the car and the turnups add downforce to the car. Other then being on something that it makes sense on, it looks as stupid as someone helping a guy get a 12 second turd into the beams, like they do at Lights Out..
You guys who don't like Jr Dragsters just don't like having to race a kid with 18 year old reflexes and eyesight, great hand-eye coordination from the video games, and 10 years of drag racing experience.
Last edited by CMcAllister; 04/15/18 03:50 PM.
If the results don't match the theory, change the theory.
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Re: The hot new trend --Thru fender exhaust
[Re: Cab_Burge]
#2483119
04/15/18 03:54 PM
04/15/18 03:54 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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On my Rampage I have the dumps both facing inward to try and cancel each other.. I havent checked the DB on it to see if it helps.. but it should 
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Re: The hot new trend --Thru fender exhaust
[Re: MR_P_BODY]
#2483122
04/15/18 04:05 PM
04/15/18 04:05 PM
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Joined: Dec 2005
Posts: 11,780
Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,780
Fulton County, PA
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On my Rampage I have the dumps both facing inward to try and cancel each other.. I havent checked the DB on it to see if it helps.. but it should Back when NHRA was on the muffler kick and checking DBs at national events, this was a recommended set up to reduce noise outside the car. Driver probably needs ear plugs though.
If the results don't match the theory, change the theory.
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Re: The hot new trend --Thru fender exhaust
[Re: bigdad]
#2487138
04/24/18 09:12 AM
04/24/18 09:12 AM
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Joined: Oct 2006
Posts: 4,590
Indy
joshking440
Lunch is on me!
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Lunch is on me!
Joined: Oct 2006
Posts: 4,590
Indy
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Re: The hot new trend --Thru fender exhaust
[Re: bigdad]
#2487148
04/24/18 09:41 AM
04/24/18 09:41 AM
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Joined: Feb 2004
Posts: 34,974
S.E. South Dakota !
bigdad
OP
Still Posting A Lot
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OP
Still Posting A Lot
Joined: Feb 2004
Posts: 34,974
S.E. South Dakota !
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Turbo cars really isn't my gripe , exhaust down low isn't my gripe
most of those people are professional test and tuners .
My gripe with them is it takes 6 people to run the car and 15 minutes to stage it .
Its the people that poke them thru with a N/A slow car , right about belly button height
The lips of fools bring them strife, and their mouths invite a beating.Proverbs 18:6
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Re: The hot new trend --Thru fender exhaust
[Re: bigdad]
#2487171
04/24/18 10:39 AM
04/24/18 10:39 AM
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Joined: Jan 2004
Posts: 4,592
Motor City
6PKRTSE
master
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master
Joined: Jan 2004
Posts: 4,592
Motor City
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I am not a fan of the glory holes or bull horns. I understand that with packaging, wheel stands, etc sometimes it is needed. I won't be hole sawing my fenders anytime soon for them.... Cracks me up though when you see a car coming back thru the pits after a pass and the whole side of the car is black if the tune is off.
1963 Belvedere 440 Max Wedge Tribute
1970 Charger R/T S.E. 440 Six Pack
1970 Challenger R/T, 528 Hemi
1970 Charger 500 S.E. 440 4 BBL
1970 Plymouth Road Runner 383
1974 Chrysler New Yorker 440
1996 2500 RAM 488 V-10 4X4
2004 3500 Dually Cummins 4x4
2012 Challenger R/T Classic.
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Re: The hot new trend --Thru fender exhaust
[Re: 6PKRTSE]
#2487200
04/24/18 12:04 PM
04/24/18 12:04 PM
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Joined: Feb 2005
Posts: 20,204
PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,204
PA.
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I'm going to weld up my side exit holes on my blue Duster and run them under the chassis now that I know a few guys on Moparts don't like it done that way. LOL.  10959870_10204537706376702_5361257763517457781_n by John Cadamore, on Flickr
1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27
Livin and lovin life one day at a time
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Re: The hot new trend --Thru fender exhaust
[Re: sgcuda]
#2487224
04/24/18 12:51 PM
04/24/18 12:51 PM
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Joined: Feb 2005
Posts: 20,204
PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,204
PA.
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I'm going to weld up my side exit holes on my blue Duster and run them under the chassis now that I know a few guys on Moparts don't like it done that way. LOL. 10959870_10204537706376702_5361257763517457781_n by John Cadamore, on Flickr While you're at it, can you throw a coat of paint on those rear shocks. I feel the red color is intimidating and makes me feel threatened by race cars. Great! Now I have to go see a shrink. I hope you're happy. Those red JC Whitney shocks intimidate me too. Lol š
1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27
Livin and lovin life one day at a time
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Re: The hot new trend --Thru fender exhaust
[Re: tboomer]
#2487242
04/24/18 01:23 PM
04/24/18 01:23 PM
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Joined: Feb 2005
Posts: 20,204
PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,204
PA.
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John...Why a chute on an 11 second car??  Man why does everyone always pick on me. Lol. Iām going to go pet my therapy kitty š±
1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27
Livin and lovin life one day at a time
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Re: The hot new trend --Thru fender exhaust
[Re: MR_P_BODY]
#2487245
04/24/18 01:33 PM
04/24/18 01:33 PM
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Joined: Feb 2017
Posts: 575
Texas
RustyM
mopar
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mopar
Joined: Feb 2017
Posts: 575
Texas
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Mr P : As an audio engineer for the last 38 years: i can tell you Factually that yes, you can tune out "certain" frequencies by turning the pipes toward each other .
Here's the deal- it takes work, time, rpm and a real time analyzer with a decent reference mic to know what your tuning, what your canceling etc.
That said- in todays world, we actually have some very good apps for this on the iphone- believe it or not , every professional concert engineer has them for spot checks etc.
there are some things to know, be aware of such as frequencies below 100 hz being fairly omni directional and big bore stroker motors have plenty down low.
If anyone wants to put their car on a chassis dyno to do exhaust tuning for cancellation to achieve as much sound control as possible, feel free to contact me and i will be happy to help remotely.
This is the one area I feel certain i could be of help to the moparts community.
If this is a big deal or, coming big deal- I may put our car on the chassis dyno and get some readings/test bed work done and share it.
There will be certain areas that will be general rules- data that applies to all etc.
Sound is simply the movement of air at different rates of speed/vibration- its just math.
If we know the frequency areas that are exceeding limits, we can tune to reduce/cancel and thus produce results.
I should be at the track Saturday to help some guys with chassis tuning and will try to get some audio data while there, its an interesting subject.
If there is interest in this area- let me know .
It would be nice to give something back to this community.
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Re: The hot new trend --Thru fender exhaust
[Re: RustyM]
#2487256
04/24/18 01:45 PM
04/24/18 01:45 PM
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Joined: May 2011
Posts: 4,489
northern,Ohio,USA
Clanton
master
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master
Joined: May 2011
Posts: 4,489
northern,Ohio,USA
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Mr P : As an audio engineer for the last 38 years: i can tell you Factually that yes, you can tune out "certain" frequencies by turning the pipes toward each other .
Here's the deal- it takes work, time, rpm and a real time analyzer with a decent reference mic to know what your tuning, what your canceling etc.
That said- in todays world, we actually have some very good apps for this on the iphone- believe it or not , every professional concert engineer has them for spot checks etc.
there are some things to know, be aware of such as frequencies below 100 hz being fairly omni directional and big bore stroker motors have plenty down low.
If anyone wants to put their car on a chassis dyno to do exhaust tuning for cancellation to achieve as much sound control as possible, feel free to contact me and i will be happy to help remotely.
This is the one area I feel certain i could be of help to the moparts community.
If this is a big deal or, coming big deal- I may put our car on the chassis dyno and get some readings/test bed work done and share it.
There will be certain areas that will be general rules- data that applies to all etc.
Sound is simply the movement of air at different rates of speed/vibration- its just math.
If we know the frequency areas that are exceeding limits, we can tune to reduce/cancel and thus produce results.
I should be at the track Saturday to help some guys with chassis tuning and will try to get some audio data while there, its an interesting subject.
If there is interest in this area- let me know .
It would be nice to give something back to this community. I hope you can do this!
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Re: The hot new trend --Thru fender exhaust
[Re: RustyM]
#2487297
04/24/18 02:30 PM
04/24/18 02:30 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 feel sure there is already some data out there I can access - will take a look . I spent about 20 years in the exhaust lab doing mainly exhaust and also worked as a sound guy in a band for 4 more years.. was fun but a PITA till I quit that.. my total time at Chrysler was 35 years.. 90% of the time in fuel and exhaust
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