Thread: My new mandrel bent customized exhaust

if you are happy we are happy.not trying to stir the pot just thinking out loud.
You know?

I just like to put my .02..

Manufaturers put X" diameter pipe to match up the engine, they dont go "Mike, what size pipe you want to install on the GTP, 2 1/4 sounds good?

Its all done for a reason, they are based on formulas.

Originally Posted by Javi

if you are happy we are happy.not trying to stir the pot just thinking out loud.
You know?

I just like to put my .02..

Manufaturers put X" diameter pipe to match up the engine, they dont go "Mike, what size pipe you want to install on the GTP, 2 1/4 sounds good?

Its all done for a reason, they are based on formulas.

If all this is correct, then give me an explanation for the U-Bend in a higher performance, boosted platform.

here is why you dont need a 3" catback:

by the time the exhaust gases get to the catback, they have cooled down considerably since the downpipe area. this means they are now taking up less space because they have cooled down (thermodynamics 101). if you use too big of piping the exhaust gases now slow down and lose velocity. you do not care about scavenging, you care about velocity. with smaller piping you dont lose that velocity and your exhaust is therefore more efficient.

make sense? this is why i tell people 2.5" is more than enough for anything after the cat.

get pics and video please i would like to listen to this

it applies on all vehicles. exhaust acts the same way, regardless of the power adder. however, turbo cars benefit from bigger exhaust because of the amount of boost they produce, therefore producing a larger amount of exhaust gases. because of the more volume of exhaust, the car is able to keep velocity of the exhaust with bigger piping. in our cars, we do not produce enough boost to make a difference so 2.5" is more than enough for anyone wanting an aftermarket exhaust.

so a 3" exhaust on a blown 3800 does nothing but increase volume and potentially LOSE power.

Originally Posted by Bio248

here is why you dont need a 3" catback:

by the time the exhaust gases get to the catback, they have cooled down considerably since the downpipe area. this means they are now taking up less space because they have cooled down (thermodynamics 101). if you use too big of piping the exhaust gases now slow down and lose velocity. you do not care about scavenging, you care about velocity. with smaller piping you dont lose that velocity and your exhaust is therefore more efficient.

make sense? this is why i tell people 2.5" is more than enough for anything after the cat.

Originally Posted by Bio248

it applies on all vehicles. exhaust acts the same way, regardless of the power adder. however, turbo cars benefit from bigger exhaust because of the amount of boost they produce, therefore producing a larger amount of exhaust gases. because of the more volume of exhaust, the car is able to keep velocity of the exhaust with bigger piping. in our cars, we do not produce enough boost to make a difference so 2.5" is more than enough for anyone wanting an aftermarket exhaust.

so a 3" exhaust on a blown 3800 does nothing but increase volume and potentially LOSE power.

in other words:

Think of a large diameter straw versus a small diameter straw. When you drink from a large diameter straw, you get more of what you're drinking but it doesn't go very far inside of your mouth. A smaller diameter straw moves the liquid quicker and farther into your mouth.

What happens to exhaust gases as they cool down? As exhaust gases cool, they slow down. Think about what happens when the you are running and exhale slower. Takes you longer to catch your breath. Right?

Where in the exhaust system do the gases cool down and is it farther down the system as you increase rpm? Gases begin to cool almost immediately. Not by a significant amount and yes, it is always further down the exhaust system that they cool the most. A larger exhaust system (more surface area) will cool the gases more quickly.

Where is the pulse based exhaust scavenging concentrated at? The scavenging depends on the entire exhaust system (pipe diameter and length, header design, muffler design, back pressure, etc.).


there are several 500 +wheel HP cars with 2.5" exhaust sytems driving around
Z06,camaros,rustangs,T/As,Evos etc etc....

Originally Posted by SleeperGS

It will not allow me to upload my pic for some reason. I feel dumb. It just says 'upload failed'. I have it under a JPG file? No Idea.

Get a photobucket account... its free... you don't have the restrictions the forum uploaders do.

Then just link it

2 pages of bs and still no pictures or videos, come on.

Originally Posted by SleeperGS

You guys keep referring to is as 'Cat back'. I have no cat, just a DP. Car is for off road use only. Anyways, there is no restrictions. Headers to DP, DP to Glasspack, glasspack to twin Thrush welds. Yes, I need a photobucket account.

that's the point. we are telling you that the 'no restrictions' is a bad thing.

I have 3" on my GTP, but it ain't no mandrel bent set up. By the time the 3" is just bent, and crimped for the angles, the I.D. is around 2.5" roughly. The first time we did it, we used 2.5" pipe, and after my accident, they cut my old pipes off and apart, and saw that the I.D. at the bends was stock size. So, thats why we went 3" the second time.

I too can't wait to see some pictures! So, quit being such a dick tease, and post em up. LOL


~F~

^yup,

they think with them installed that way, they can drip or get rid of any excess moisture that builds up on them, vs. them on their side.

Also, they were afraid of the expensive sensor being hit by debris from under the car, so they mounted it on top to protect it.

~F~

Where are pictars