amd is the best wrote:[/quote]
Kind of odd placement of the flex section in my opinion. I think it should be closer the engine (in front of the cat) but I am only speculating. I just see that when your engine move around in there the exhaust manifold and turbo have to move the ~5' section of exhaust plus cat before anything can allow movement. Just my .02, looks great though and that muffler doesn't look bad nestled up in the bumper either![/quote]
Yea I've been trying to figure out what to do. The only place it would fit in front of the cat is in the straight part of the down pipe. Thoughts on that?
The exhaust has a hanger on the transmission, so there's not a whole lot of separate movement between the exhaust and the motor up to that point.
Re: Casey's 200 20v: T-5 Days... Exhaust nearly complete!
Posted: Thu Apr 26, 2012 9:20 am
by loxxrider
On my car it was right in front of where you have the cat.
Re: Casey's 200 20v: T-5 Days... Exhaust nearly complete!
Posted: Thu Apr 26, 2012 9:24 am
by WOMBAT
loxxrider wrote:On my car it was right in front of where you have the cat.
so on your down pipe? I really don't have any room forward, and the cat because of its shape doesn't fit further back :(
Re: Casey's 200 20v: T-5 Days... Exhaust nearly complete!
Posted: Thu Apr 26, 2012 9:33 am
by loxxrider
Ya its cuz I have no cat. My downpipe made that 90 right where yours does, then vband into the flex section and the rest of the exhaust.
Re: Casey's 200 20v: T-5 Days... Exhaust nearly complete!
Posted: Fri Apr 27, 2012 3:58 am
by WOMBAT
Alright guys, try this on for size... made a change last night. The flex pipe is now in the downpipe.
All that's left for the exhaust now are EGT and O2 bungs, and I need to plumb in the wastegate. The car is so close to being back on the ground! Just need Bilstein to come through with the new gland nuts.
Re: Casey's 200 20v: T-4 Days... Exhaust work is getting bor
Posted: Fri Apr 27, 2012 5:22 am
by Glug
Re: Casey's 200 20v: T-4 Days... Exhaust work is getting bor
Posted: Fri Apr 27, 2012 5:26 am
by WOMBAT
Re: Casey's 200 20v: T-4 Days... Exhaust work is getting bor
Posted: Fri Apr 27, 2012 7:01 am
by loxxrider
Now that is whats up! Definitely a good stress reliever for the manifold/downpipe if the rest of the exhaust hits something.
Re: Casey's 200 20v: T-4 Days... Exhaust work is getting bor
Posted: Fri Apr 27, 2012 7:29 am
by Dr.Strangelove
The exhaust looks good!
"ebay crappy muffler that will get changed out sooner rather than later because it's 3" in and dual 2.25" out which completely negates my 3" exhaust.... damn you ebay. Or I just need a cutout."
I don't think you need to change your muffler out. 2x2.25" pipes flow more than a single 3".
A=pi(r)^2
A=(pi(1.125)^2)x2=7.95
A=pi(1.5)^2=7.07
Re: Casey's 200 20v: T-4 Days... Exhaust work is getting bor
Posted: Fri Apr 27, 2012 7:38 am
by WOMBAT
Yea I've done that calculation before, but there are additional flow losses due to increased surface area of two 2.25" pipes (and there's jagged piping in that muffler that chokes it to 2 1/8 in some cases). Also, the way they went from a single 3" to the dual out with the perforated tubing and baffling is horrendous and not flow friendly. That's what really grinds my gears. You can see in one of the pics I cut out the top of the muffler to try and rearrange things, but it's just terrible haha
Re: Casey's 200 20v: T-4 Days... Exhaust work is getting bor
Posted: Fri Apr 27, 2012 10:27 am
by loxxrider
That sucks about the muffler. One thing to note is that the losses from increased surface area will be really low (just in case anyone reading this is curious about that).
You can calculate the pressure loss through a pipe based on the following relation:
delta Pressure (head loss) = friction factor * (Length-of-pipe/D-of-pipe)*[(density-of-fluid)*(volume-flow-rate/cross-sectional-area)^2]/2
We can then assume some Volume flow rate. Assume we have 1000 CFM flowing through the engine.
From this, I have done some calculations (for a short section of pipe like you'd have in a muffler) and found that to get the roughly same pressure losses as a 3 in pipe, you need two 2.5 inch pipes. However, the pressure loss difference from a 3 inch pipe vs. two 2.25 inch pipes is something like 7 Pa... which is not much at all. I'm not really sure how this relates to restriction, and thus power losses thru the engine though.
Re: Casey's 200 20v: T-4 Days... Exhaust work is getting bor
Posted: Fri Apr 27, 2012 10:37 am
by derracuda
if you like the sound, leave the muffler, you aren't losing anything noticeable back there.
Re: Casey's 200 20v: T-4 Days... Exhaust work is getting bor
Posted: Fri Apr 27, 2012 10:57 am
by groff
i'm confused why we're still talking about the poop ebay muffler when there is a cat in the system. you're loosing a hp with the muffler, nbd, and 10x that from the cat, its about how it drives not how it dynos.
Re: Casey's 200 20v: T-4 Days... Exhaust work is getting bor
Posted: Fri Apr 27, 2012 11:14 am
by WOMBAT
if it weren't for VT, that cat wouldn't be there.
Re: Casey's 200 20v: T-4 Days... Exhaust work is getting bor
Posted: Fri Apr 27, 2012 11:19 am
by groff
just gotta know the right guys that like beer
Re: Casey's 200 20v: T-4 Days... Exhaust work is getting bor
Posted: Fri Apr 27, 2012 11:26 am
by WOMBAT
groff wrote:just gotta know the right guys that like beer
Very true. Too bad I didn't have enough pipe left over to make a 'test pipe' to throw in post inspection 8)
Eventually...
I'll call Casey tonight to coordinate.
