Jump to content

2019 5.3 with Flowmaster Delta flow 40 series

DHBWA

By DHBWA
in Modifications, Wheels & Tires

 Share

Recommended Posts

DHBWA Enthusiast

DHBWA

Posted
Posted (edited)

I initially covered all 6 resonators with factory muffler and it was almost what I wanted. I preferred to buy the AFE Apollo muffler upgrade but it’s on back order. After a bunch of research and having an old version series 40 on my 1994 5.7 I ordered the SS version delta flow 40 series and had it installed and removed the flapper which I had wired open.

With all 6 resonators covered it was a little loud with a little drone. Started uncovering resonators and now have 1.5 on each side covered. 
Now to why I posted this topic.

Anyone else with this or another performance muffler notice a little blubbering/ rumbling on decel when below 1200 rpm?? If you hold the downshift and decel say at 2500-3000 it’s smooth until you down to a real low rpm then you can hear it burbling….. Seems strange to me.

 I don’t really like it…

 I also have a Range Pulsar.

Thoughts??

Edited by DHBWA
  • DHBWA changed the title to 2019 5.3 with Flowmaster Delta flow 40 series
Russ757 Enthusiast

Russ757

Posted
Posted

yep.. with or without the Pulsar. I have to go through the burbs so lots of coasting at which you get the putt putt putt. Not sure if thats what youre referring to. This with a flowfx catback system

DHBWA Enthusiast

DHBWA

Posted
  • Author
Posted

Yup. I called Flowmaster (Holley) and he said it’s because of the engine design in combination with a chambered muffler. I can’t win. Every time I change exhaust on a vehicle I end up redoing it. 
he suggested and I just ordered a Hooker VR304 3”-3” muffler (oval glass pack) you don’t hear much about them but what he said made sense…

I have tried covering all, some and none of the 6 screen resonators with no gain yet…..

DHBWA Enthusiast

DHBWA

Posted
  • Author
Posted

I really don’t want to go to the effort on the flapper but will try once more with screens all uncovered and once with all covered 

DHBWA Enthusiast

DHBWA

Posted
  • Author
Posted
3 hours ago, Russ757 said:

yep.. with or without the Pulsar. I have to go through the burbs so lots of coasting at which you get the putt putt putt. Not sure if thats what youre referring to. This with a flowfx catback system

I just figured out that your FlowFX muffler isn’t a chambered muffler. It’s Flowmasters version of a Magnaflow (oval glass pack) so my idea of going to a Hooker VR304 probably won’t help…..

DHBWA Enthusiast

DHBWA

Posted
  • Author
Posted

With all resonators uncovered it quieted it down overall and subdued the put-put that it’s mostly a non-issue.

 I doubt I will install the Hooker. 
 

I tried it again this morning with all 6 resonators covered and didn’t notice any drone and really like the sound. The put-put was louder but that is almost better if it’s going to do it.

More to come…

DHBWA Enthusiast

DHBWA

Posted
  • Author
Posted

Uncovered the resonators for the commute. Cruising there is zero drone and sounds almost stock. Idle and acceleration is throaty but subdued to an adult level. I will probably cover all resonators for tomorrow’s commute and see…..

DHBWA Enthusiast

DHBWA

Posted
  • Author
Posted

Covered them all for the return trip. Too loud for me and the put-put-put at slow decel was pronounced. Probably stick with having them all uncovered. Wish it was just a tad louder but I have a history of fixing things until they are broke…..I better quit while I am 90% satisfied……

CamGTP Senior Enthusiast

CamGTP

Posted
Posted

I don't have any data logs on this computer or really any that I've done recently to show but these computers will enable decel fuel cut off while coasting to a stop. They will also re-tard the ignition timing to negative values while coasting and when it needs to make down shifts. The sharp drop in timing is to pull torque/power and make it easier for the transmission to shift gears.

 

Decel fuel cut off turns off the fuel injectors completely and it's using the engine as an air pump to slow the vehicle down. This is likely what is happening and the answer to why you hear what you hear.

DHBWA Enthusiast

DHBWA

Posted
  • Author
Posted

Thanks Cam.

Makes sense and supports my thoughts that it probably won’t matter what muffler I have except to say the quieter the muffler the less I will hear it.

DHBWA Enthusiast

DHBWA

Posted
  • Author
Posted (edited)

Another tidbit. 
Removed the Range Pulsar to have some work done at the dealership and with it removed 90% of the low speed - low rpm decel put-put noise. Obviously something to do with the DFM. Of course it makes other awful noises…..

Have an appt next Thursday to do some muffler tests but not convinced I’ll get what I want….

Edited by DHBWA
  • 2 weeks later...
DHBWA Enthusiast

DHBWA

Posted
  • Author
Posted

Installed a Hooker straight thru packed muffler.

To me it’s a Magnaflow copy.

It’s quieter and thusly the decel putt putt is less noticeable. Although quieter overall it seems to drone more at 70.

I really really prefer the crisper higher pitch of the Flowmaster. 
Just need to decide if I can ignore the decel puttering with the FM.

 

Hope this helps someone someday…

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.3k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,677
    Total Members
    8,960
    Most Online
    RobbertClaus
    Newest Member
    RobbertClaus
    Joined

  • Who's Online   4 Members, 0 Anonymous, 480 Guests (See full list)

  • Latest Articles

  • Posts

    • KARNUT
      Oil Consumption

      By KARNUT · Posted

      No I didn’t watch a video of a person who analyzes oil for a living explain general oil usage. For clarity I did ask my brothers one who runs our equipment business. The other who runs our old ROW business about oil usage. Nothing has changed since I retired. Their personal vehicles or work vehicles use no oil. Not enough to see on the oil checking device. Then I pondered. I like to ponder. In this extended oil changing world with oil change countdowns or lights. If engines used say a qt every 2500 miles or up to even 4000 miles. With oil changes reaching as high as 15000 miles. Normal for most people is eight to ten. Vehicles should potentially be seizing up all over the place. Especially in hilly terrain. Just how many people actually check their oil? Maybe 10 percent. Those are the people that probably change their oil early. I like to research used car listings. I have five favorite dealers I check. They all list carfax with their listing. It’s rare to see vehicles with anything but extended oil changes. Transmission service, forget about it. I’ve seen Honda and Toyota certified vehicles up to 100K miles and ten years old. With nothing but normal maintenance. Isn’t nice we all have different experiences and believe our way is the best. You certainly get backup for whatever you believe. Life would be boring otherwise.
    • RobbertClaus
      RUMOR / INSIDER: 2027 Silverado Dealer Reveal NEXT WEEK

      By RobbertClaus · Posted

      Interesting rumor. Dealers near me have been tight-lipped so far, but if this reveal actually happens next week, I'm really hoping they finally give the HD a proper interior overhaul. The competition has been eating their lunch in the cabin department for a while now.
    • Chuck FB
      Oil Consumption

      By Chuck FB · Posted

      There are a few good takeaways in that video that pertain to this thread, certainly the possibility of the oil control rings having buildup, the fuel injectors and how clean or not that they are ending up affecting the pistons rings carbon buildup, and the fact that its normal up to a point for a given engine to use some oil, and that the oil quality that is being utilized is part of that ring clogging up issue as well.   I was talking with a neighbor yesterday who has a baby LZ0 duramax and he had bought it slightly used but it does consume some oil and he has switched over to 5W-30 Euro spec oil and in this case that never made a difference in consumption over the factory 0W-20 recommendation. He finds it uses a quart in about 3500 miles and as he goes a ways over that distance he adds oil to full and goes another 1000 miles or so and then changes oil and is typically at 40% or so left on the oil monitor at that point with his use case of quite a lot of highway miles and more limited in short run use. I don't know what other LZ0 engines are doing for oil consumption but that is what his is doing. 
    • riddler
      Oil Consumption

      By riddler · Posted

      I dont care what Lake says. Goodnight. 
    • Atlas
      Oil Consumption

      By Atlas · Posted

      Ok well I guess Lake disagrees with me on a few points. I call oil consumption pretty basic. Rudimentary. He calls it "really complicated." I think 1qt consumed in 3k miles is a lot. He says that's normal. In 22 minutes, he'll use his natural talent to explain oil consumption to anyone watching this video. He covers everything from obvious engine damage to how normally functioning healthy engines consume oil by design. Lake explicitly states how you drive will impact oil consumption.   Shut up and watch:    

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...