True Duals Rasp???
#21
10 Second Club
iTrader: (1)
Join Date: Sep 2007
Location: In Uranus!
Posts: 1,500
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I think you need a dyno tune. I have true duals on my car with the magnaflow magna pack mufflers, H-pipe and There is no rasp and no back fires at all! There is a video in my sig you can click on and hear what my car sonds like at WOT. This is with a stock bottom end LS1.
#22
TECH Addict
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
ok OP i have the same set up as u plus a cam i also get back fire but trust me its perfectly normal for this set up. its because the bullets are straight through, no baffles or anything, and when u shift or decel at just the right rpm the sudden change in flow through these really open free flowing pipes will let out a pop every once in a while. my car is dyno tuned and runs tip top. but if your air/fuel is off a little i'm sure thats not going to help so a tune couldn't hurt but it'll never completely go away with this set up.
http://www.youtube.com/watch?v=L1zk-tqQdX8
^at the end of the vid when i am driving away then decel listen closely...its normal.
http://www.youtube.com/watch?v=L1zk-tqQdX8
^at the end of the vid when i am driving away then decel listen closely...its normal.
#26
On The Tree
iTrader: (5)
Join Date: May 2009
Location: Sunshine State
Posts: 145
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
i think its just the nature bullet style mufflers to have rasp and back fire. It sounded pretty normal like how it should be. but the addition of cats would help with the rasp and backfire.
#27
On The Tree
iTrader: (4)
Join Date: Feb 2009
Location: Ohio
Posts: 134
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
the rasp is from lack of cats.
the popping is from having very little backpressure thanks to the free flowing bullets
i have rasp and popping with dual cutouts open but neither closed through the cat and muffler
put your cats on before u change the muffler and see if your happy. they're restrictive but they'll tone it down. different mufflers can have the same effect but it's expensive to keep buying the wrong ones
the popping is from having very little backpressure thanks to the free flowing bullets
i have rasp and popping with dual cutouts open but neither closed through the cat and muffler
put your cats on before u change the muffler and see if your happy. they're restrictive but they'll tone it down. different mufflers can have the same effect but it's expensive to keep buying the wrong ones
Last edited by toslow5o; 10-28-2009 at 10:46 PM.