exhaust drone and sputtering after 4krpm on boost

[superspeed]

My car set is currently:

ct26 57 trim turbo
intake
3inch dpp and 3 inch straight pipe to a hks dragger muffler
everything else stock afm and injectors


1st question:

how do i get rid of exhaust drone? would a high flow 3 inch magnaflow cat work or do u guys have other suggestions?

2nd question:

when i am boosting after 4k rpm it starts to stutter alot(like a put put put put sound) but it will keep going all the way to 6krpm is this a spark issue? i currently have autolite 5503 and i belived gapped to about .032 should i lower it to .030?

 

[Moy]

For the drone, you could replace the test pipe with a resonator, which would help reduce the drone

 

[hvyman]

Resonator would be your best bet to keep the drone down.


Get rid of the autolites and get some ngk coppers which are 2$ each.

 

[Poodles]

Straight exhaust back to a straight through muffler, yep, gonna drone like mad. Add a resonator (though in the place of the cat might not be the ideal place for sound or clearance...)

 

[superspeed]

hmmm what about the stutter? its like after 4krpm i am at 10psi i get a "d d dd d d d d d d" and a lil bit of jerkin

 

[Flateric]

I also fought the drone and hate it. The only option for me was to swap my test pipe out and replace with a resonator since I do not have space for it elsewhere in my system. Not the best location for it that is true, but it still helped a little. Not sure about your stutter though.

---------- Post added at 12:55 AM ---------- Previous post was at 12:54 AM ----------

Perhaps your wastegate spring strength isn't setup correctly in your boost controler if you have one. Since that is right about where mine sorta stuttered until I went in a configured the controller properly for the correct spring strength. Tru-boost from AEM is the unit I am referring to.

 

[Poodles]

hmmm what about the stutter? its like after 4krpm i am at 10psi i get a "d d dd d d d d d d" and a lil bit of jerkin

Check for codes.

 

[Nick M]

The drone is also from the Dragger exhaust. It is designed to make that sound.

 

[Poodles]

Eh, it's a dragger muffler, the entire cat-back doesn't drone...

 

[superspeed]

what about the boost stutter?

 

[Poodles]

Did you check codes yet?