Quieter exhausts?

[BillC]

Howdy,

Ever since I installed the PT52 and downpipe on my Ty, it's been like driving inside a subwoofer enclosure. There are certain RPMs and speeds where it resonates so badly you can't hear anything except the exhaust, and it's just loud everywhere else.

Anybody have any suggestions for quieter mufflers or short/small resonators? I'm loooking for ideas that won't require a lot of fabrication and won't hurt my exhaust flow. I also want to keep the catalytic converter.

On my Ty, I have the PT&E 3" downpipe and cat and the ATR 3" cat-back exhaust system.
Things I have tried so far:

• ATR muffler that came with the exhaust. (very loud)
• Borla 16" Sportsman muffler. (no change)
• Dynomat Extreme under the back seat, in the back area and on the rear quarters. (very slight improvement, but virtually unnoticeable)
• Dynomat Extremeliner on top of the Dynomat Extreme in the back an quarters. (very slight improvement, but not enough to make up for the extra weight)
• Double- and triple-checked for exhaust leaks and/or contact with the frame or body (none)
• Dynomax Ultraflo Race muffler #17223. (Definite improvement, but not enough)

So far, the Dynomax is the best. It brings the noise down to where it is almost bearable. However, I really want to get the noise down to the point where I can listen to my radio or talk to my passengers.

Any help or suggestions would be greatly appreciated. Thanks.

 

[warmpancakes]

do you have a cat? if not put one in it will quiet it down alot but hurt spool up, remember the best exhaust for a turbo is the least exhaust

 

[BillC]

do you have a cat?

Yes, as stated in the second and third paragraphs of my original post. I also have one inside the house, but that one is too furry and would clog my exhaust. :razz:

remember the best exhaust for a turbo is the least exhaust

Agreed, and well understood. That's why I'm asking for suggestions to quiet the exhaust without restricting exhaust flow. I think the answer is going to be adding a 3" resonator, but trying to find one small enough to fit is difficult.

I was hoping that I wasn't the only Ty owner who has gotten tired of the noise. I'm looking for input and suggestions from other owners on how they dealt with this problem.

 

[RAACCR]

See if you can fit a Dynomax Race Magnum "bullet" muffler between the cat & the Ultraflow. They make a 12" long version. (I don't know if there's enough room under a Ty due to the shorter wheelbase.) And triple check that the exhaust doesn't rub on anything when the motor torques over.

Rob

 

[BillC]

See if you can fit a Dynomax Race Magnum "bullet" muffler between the cat & the Ultraflow.

Unfortunately, there isn't room. On a Sy, the pipe between the cat and the muffler is a straight pipe, so it might fit. On a Ty, however, that pipe has a big "S" bend in it to clear the floor. So, there's no way fit fit a 16.5" (overall length) bullet in there. If I could find an 8" bullet, it might fit in the last section of downpipe (before it goes into the cat), but it would be very tight against the floor and the passenger-side torsion bar.

And triple check that the exhaust doesn't rub on anything when the motor torques over.

I have done that. I also have a tie-down chain on the motor, so it can't move much at all. Besides, the loud exhaust noise doesn't happen at WOT, it happens at cruise and at idle. So, even if the pipe was hitting at WOT, that's not the problem. Believe-it-or-not, the exhaust is significantly quieter at WOT than it is at idle or 40 mph cruise.

The problem with adding a resonator is the !*#&%@ short wheelbase on the Ty. This causes the pipes to have a lot of twists and turns. The only straight sections long enough to install a resonator are where the cat and muffler already are. Very frustrating.

 

[0966Sy]

I just dumped out the exuast before the rear axle. It makes the exuast a bit quiter, but in most states you have to have exuast that exits outside the truck to pass inspection.

Erik
Houston,Tx

 

[sy2185]

dual dynomax super turbos(on it when purchased)have a nice sound but won't make you cringe as you try to leave the house at 2am.
Jeremy

 

[BillC]

dual dynomax super turbos

Unfortunately, there isn't room under a Ty for dual mufflers or the piping required. Also, according to Dynomax, the SuperTurbo mufflers have a significantly lower flow rating than the Ultraflo.

 

[bdubb]

ever try dynomat in the that corner of the truck to reduce the noise?

 

[BillC]

ever try dynomat

If you had bothered to read my entire post, you would have seen that I am using both Dynamat Extreme (better than original Dynamat) AND Dynamat Extremeliner. Unfortunately, they didn't help much.

 

[ParTyBoy]

On 2002-04-05 09:44, BillC wrote:

ever try dynomat

If you had bothered to read my entire post, you would have seen that I am using both Dynamat Extreme (better than original Dynamat) AND Dynamat Extremeliner. Unfortunately, they didn't help much.

I guess BDubb's next post would offer some advice like trying to use earplugs.. :lol:

 

[rockvillespeed]

play nice, boys.
bill, tho i just saw you an hour ago, i just had a thought.
we usta do this all the time - fill the body cavities with expanding foam.
b at shop 2-5 2morrow - give a call if u get the shocks in