N/A dynomax exhaust Y-Pipe

[NO_SPRK]

Scored this dynomax y-pipe... dont ask me from where

I'll will be using a banks turbo exhaust system for the rest of the system. It's 3 inch pipe to the muffler and 3.5 after that. I have a 4 inch chrome tip that I have to use because the 3.5 tailpipe is crushed on the end.

You must be registered for see images attach

You must be registered for see images attach

I hope the length of my crew cab helps build back pressure. I don't want to lose bottom end power.

I think the banks muffler is not a true straight through design which will help me with back pressure

Sent from my SCH-I605 using Tapatalk

 

[riotwarrior]

Nice...very nice, i've something similar in design and compared to the ones I cut apart for flanges for Russ it's a super flowing one...

Back pressure = bad...JM2CW, it's negating the effort of engine to expel it's waste...thus creating a loss of power IMHO

Hope you can show pics of all that going int too!!!

 

[NO_SPRK]

Well considering I lost low end power on straight pipes I'm keeping the muffler in hopes it helps off idle and low RPM power... since it is a turbo muffler with 3.5 exit I'm sure it won't restrict much flow.

I will take pics and will be swearing a lot trying to fish in the whole banks cab back exhaust

Sent from my SCH-I605 using Tapatalk

 

[dunk]

Back pressure hurts performance. If you want back pressure just Y into a 2" pipe and call it a day, performance will suffer. What you want is a properly sized exhaust that offers little resistance to flow and maintains velocity. Too big and you lose velocity, the air slows, stalls, tumbles, etc. Too small and it won't flow enough, creating back pressure and hurting performance as it takes more power to push the exhaust out of the cylinder.

 

[riotwarrior]

Well considering I lost low end power on straight pipes I'm keeping the muffler in hopes it helps off idle and low RPM power... since it is a turbo muffler with 3.5 exit I'm sure it won't restrict much flow.

I will take pics and will be swearing a lot trying to fish in the whole banks cab back exhaust

Sent from my SCH-I605 using Tapatalk

is that butt dyno or on the rollers?

Could be loss of exhaust velocity, from too big of pipes...funny thing as gasses cool pipe diameter needs change...

Not sure how you loose power by freeing up the air pump...aka engine's breathing, I betcha it just moved to a different RPM range but none was lost actually.

 

[NO_SPRK]

is that butt dyno or on the rollers?

Could be loss of exhaust velocity, from too big of pipes...funny thing as gasses cool pipe diameter needs change...

Not sure how you loose power by freeing up the air pump...aka engine's breathing, I betcha it just moved to a different RPM range but none was lost actually.

I didn't change the y-pipe.. All I did was step up from 2.5 to the same banks exhaust I used on that truck. I gained some top end and the butt dyno said I lost some off idle or low RPM power. This was a 3.55 ZF5 truck.

Sent from my SCH-I605 using Tapatalk

 

[towcat]

don-
save me the part numbers on the pipes. or at least record them.

 

[NO_SPRK]

Here's the banks exhaust I have now. I measured between the rear muffler mount and the second mount (found on crew cabs vs single) and it lines up! Using the front mount on the new y-pipe should leave me with 18 or so inches of pipe to connect.

You must be registered for see images attach

The tail pipe is a bit smashed but I have this 4 inch tip

You must be registered for see images attach

I'm going to wait till Monday and bring it all to my favorite local exhaust shop A1A muffler.

Only problem is my 91 has twin rubber hangers and this exhaust has the compression bar that clamps it to the cross member.

I hope I saved the bar that clamps it


Sent from my SCH-I605 using Tapatalk

 

[NO_SPRK]

don-
save me the part numbers on the pipes. or at least record them.

I'll e-mail them now

Sent from my SCH-I605 using Tapatalk

 

[NO_SPRK]

You must be registered for see images attach

You must be registered for see images attach

Sent from my SCH-I605 using Tapatalk

 

[PwrSmoke]

NA can lose bottom end with pipes too big, though a 3-inch system would be almost unnoticeable butt dyno-wise. A 2.5" mandrel bent with a good flowing muffler has more than enough flow for an NA truck... about equivalent in flow to a crimp-bent 3". Was at the Dynomax research lab in '08 and they flow tested some different types and sizes of pipes for me to use in a story. The Banks mufflers flowed well (very large chamber muffler) but they weren't straight thru. Nice and quiet!

 

[NO_SPRK]

NA can lose bottom end with pipes too big, though a 3-inch system would be almost unnoticeable butt dyno-wise. A 2.5" mandrel bent with a good flowing muffler has more than enough flow for an NA truck... about equivalent in flow to a crimp-bent 3". Was at the Dynomax research lab in '08 and they flow tested some different types and sizes of pipes for me to use in a story. The Banks mufflers flowed well (very large chamber muffler) but they weren't straight thru. Nice and quiet!

The problem with a crew cab long bed Is 4 more feet of 2.5inch exhaust. When on a freeway sound wall I have that horrible whoosh sound of restriction.

I was pleased with the sound previously so I hope this will be quiet and more powerful.

Thanks for the post

Sent from my SCH-I605 using Tapatalk

 

[Garbage_Mechan]

I can tell you this: I put a Banks Powerpack Y pipe and a 3" system with straight through muffler on my N/A 86 6.9. With no other changes, it picked up up 1 MPG. Now the Banks Y pipe is a piece of art compared to the stock and Dynomax ones. There is a lot more care put into the flow through the Y. Too bad Banks doesn't make it anymore (I heard) because it is the key!

 

[CDX825]

Is this the 3" y pipe that has been said to be no longer available?

 

[franklin2]

I just put a complete stock walker system on mine for less than $200. That dynomax y-pipe doesn't look any different except maybe the pipe is a little bigger where the "y" comes together. From what I measured the walker system is 2 1/2 diameter after the y. I didn't use a muffler, I just welded a piece of galvanized chain link fence post in where the muffler goes (same size). I can't believe how quiet it is without a muffler. This truck originally had 2 1/4 duals with glasspacks when I bought it, and it made a very loud popping noise with a load on it. But with the single system on it now, no more noise.