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KATOOM

DO EXHAUST RESONATORS ROB HORSEPOWER??

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I would agree with that and already figured the volume coming out of my exhaust isnt going to relate to anything close to 120 hp loss.  But...if a 900 HP truck will loose that much power just from a short resonator then a 300 HP truck will have to loose something significant as well. :think:  Maybe 30-40 HP?  Not sure but just surprised at what they discovered in that vid...

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1 minute ago, KATOOM said:

I would agree with that and already figured the volume coming out of my exhaust isnt going to relate to anything close to 120 hp loss.  But...if a 900 HP truck will loose that much power just from a short resonator then a 300 HP truck will have to loose something significant as well. :think:  Maybe 30-40 HP?  Not sure but just surprised at what they discovered in that vid...

a modded cr flows air much more efficent than the vp's.  It is not a 1:1 relationship.  

 

I doubt there is a 5 hp difference as the 4" is already way more than enough for 300 hp worth of exhaust.  

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Straight pipe has always been the best flowing exhaust. Even my muffled exhaust will have a loss to it.  How much? I'm not sure... But remember this is during WOT operation on the dyno. Daily driver always going to be partial throttle unless your showing off.

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I'm not a show off and my WOT situations are climbing a long grade with a heavy trailer and wanting everything the engine can offer.  I have no idea what kinda power loss those resonators cause but it would sure be nice to know since below is what they say on their website.  I'm not dogging on FTE but its hard to disagree with the dyno...

 

This unique spiral design virtually eliminates the unwanted sound while keeping flow characteristics for both performance and EGT reduction.

Small and Simple Design makes this unit ideal for mounting in tight areas, heavy construction ensures it lasts a long time. See what customers are saying about their experience with this amazing product at www.cumminsforum.com, this product has proven itself to work great on all diesel powered trucks alike (Cummins, Powerstroke, and Duramax).

  • 4" ID Inlet & Outlet
  • 5" maximum diameter x 17.5" Over All Length - 12" Usable
  • HD Aluminized Construction
  • Eliminates irritating "Drone" & Cab Noise, maintains good sound out tailpipe or stacks
  • No gain in EGT or reduction in flow
  • Premium grade product

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I really think you are overthinking it, your existing 4" system has so much overhead in terms of flow at your power level that adding a resinator shouldn't do squat.  

 

Gotta remember that CR truck was likely running a full 5" system, adding a resinator likely created a bottleneck.  Your truck already has that bottleneck the hx35 already has a restrictive elbow on the back of it, then you jump to your 4".

 

I am %100 sure the resinator is less of a restriction than the hx35 is.

 

:2cents:

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Another thing to think about is the further down stream from the engine the cooler the exhaust gas and it's volume is reduced negating the need for large pipes to maintain the same flow rate.

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I vote someone with an FTE do a with and without dyno test for us all...  For educational purposes of course.  :smart:

  • Like 1

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21 hours ago, Dieselfuture said:

I believe I have a 5" resonator on mine,  unless it's a muffler :think:

When PA decided a turbo no longer qualified as a muffling device I had to install one or the other. I decided to re-install the one that had 'fallen off'. I cut it in half to grease the bearing and couldn't believe what was in there. There was a pipe that was full of holes. Dang near rusted apart. There were also some springs in there. Looked like valve springs- exhaust valve springs I assume. I cleared all that junk out of there, welded it back together and put it back on where it 'fell off'. Now Mr. Inspector is happy again.

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6 minutes ago, dave110 said:

When PA decided a turbo no longer qualified as a muffling device I had to install one or the other. I decided to re-install the one that had 'fallen off'. I cut it in half to grease the bearing and couldn't believe what was in there. There was a pipe that was full of holes. Dang near rusted apart. There were also some springs in there. Looked like valve springs- exhaust valve springs I assume. I cleared all that junk out of there, welded it back together and put it back on where it 'fell off'. Now Mr. Inspector is happy again.

I can't tell if you're serious or joking, but it's funny ether way to me :thumb1:

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I'm only serious when I need to be. Tonight I don't feel the need :lmao:

17 minutes ago, Dieselfuture said:

 but it's funny ether 

Things get really funny if you inhale enough ether.

  • Haha 2

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12 minutes ago, dave110 said:

I'm only serious when I need to be. Tonight I don't feel the need :lmao:

Things get really funny if you inhale enough ether.

what are you doing inhaling ether :think: trying to start your truck? 

It's kinda cold here today -15 tonight, not horrible but enough to let you know it's chilly. 

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57 minutes ago, Dieselfuture said:

what are you doing inhaling ether :think: trying to start your truck? 

 

Truck starts fine. I'ts me that needs a kick in the pants to get going in the morning.

50 minutes ago, dripley said:

So did you grease the bearing?:whistle:

I was going to after the ether shot. I don't remember now..................

Edited by dave110
  • Haha 2

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I attempted 5" with  no muffler. Drove around the block pulled right back in the garage and put one fte short resonator on.. this helped alot. Killed alot of drone and noise. Couldnt tell any difference from the straight pipe.

 

However I found it still to noisey so I I orderd a second fte. This killed more drone and noise. Still no felt difference in power.

I think I have one of the quiter 5" trucks however on the throttle its still alittle loud but I dont drive onthe throttle much. Was hoping the 62 turbo would quite it more but I think it actually got slightly louder

 

I also didnt notice any change in egts from no resonator to two resonators..

 

Youl be happy with the fte.

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Funny... 3" exhaust I ran straight pipe for year never had drone.

 

Now running 4" muffled and have drone only while towing on 6% and 7% grades. 

 

Basically bigger the pipe the more the drone issues and being loud.

Edited by Mopar1973Man

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5" with nothing was undrivable nothing about it was cool.  It did have  cool sound at side but ohhh my on the throttle was just embarrassingly noisy 

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Yup that's why I never wanted to give up my 3" exhaust because is was super quiet and never had a EGT issue. 3 inch exhaust can support quite a bit before needing to step up to 4 inch exhaust.

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Back when all I was running was the EZ, I know for a fact that when I replaced my 3" straight piped factory exhaust with a 4" exhaust system I gained some HP.  I dont believe it was copious amounts because it was nothing the butt detector could register, but I'm going to guess around 10 HP.  Just enough to make the stock clutch slip at WOT while pulling my 5th wheel up a steep grade in 4th gear.  There was no denying the gain either since there was zero other variables to consider.  I literally did nothing else from one day making that pull to another day making the same exact pull but with a new exhaust system...

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I would not doubt one bit you made power with a 4" exhaust. 

 

I saw lower egts going from 4-5.

 

I saw squat going to the bd pulse 3 peice manifold.  Nothing on gauges or but dyno. 

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I've got a 5" FTE resonator and a muffler on my 4th gen. 
Before adding the FTE, I just had the muffler. I didn't notice any difference when I added the resonator in (EGTs, mpg, or butt dyno). I'm guessing my hp is around 385-400. I doubt you'd notice anything. 

That said - FTE is known to cause restriction. 

Edited by TFaoro

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On 2/13/2020 at 6:53 PM, KATOOM said:

I vote someone with an FTE do a with and without dyno test for us all...  For educational purposes of course.  :smart:

 

It makes a world of a difference in sound. 

 

My exhaust finally broke before my FTE resonator the other day. As for me I didn't notice any performance difference. Now I suspect that is because the 4" is much larger then the flow of the motor.  Therefore any restriction that could be there is not there. 

 

The only difference is sound, that drone is killer. Irony has it that I was looking to replace that exhaust because it was coming apart anyways. Now I have an excuse to replace it.

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