rumble for my mark

richduty455

richduty455

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Hey guys, just picked up mark #2, 94 dark portofino blue with portofino blue interior, I think i stole it, $1200, car has 134k on it, but brand new trans with shift kit, newer bags, everything works, AC and all, just needs a console lid and a cup holder and car is good, paint has good shine, moonroof, 10 disc in the trunk, JBL and chrome 20 spoke rims plus car runs like a raped ape!!! anyways I want to give it a little rumble, thinking of keeping the stock exhaust and switching out the mufflers, will i get any sound with this or am i wasting my time. I was thinknig of putting on a set of glasspacks or something, this one is the daily beater and i'm keeping it on a budget. Any suggestions would be appreciated...thanks!
 
duals (if its not an LSC) hack off the third cat put an x-pipe there and some flowmaster 40's. it'll give that throaty purrrrrrr without sounding like a truck
 
I would just cut the stock mufflers off and weld tail pipes on... its cheap, sounds good, and did I mention cheap?
 
question: I've heard if you just run straight pipes you loose alot of low end torque with a mark viii......i want some rumble, but not at the cost of power....any thoughts?????
 
The thing is you loose a lot of back pressure, which in turn causes a loss of torque. So even if you put on an open muff, like a glass pack, your still gonna have SOME power loss. I dont think its that noticable, but if it is, you could always weld in some cheap muffs to help fix it. You kinda gotta balance between sound and loss of pwr. Best thing to do is make it true duals with x pipe.
 
My stock mufflers are off. My primary cats are too and frankly its a little louder than I like. But even then it still sounds good. You know so when people ask about the exhaust setup and all you say is its stock minus a few things.
 
On a budget- just swap the mufflers for a pair of racing mufflers.
If you have a little more to spend, then do a cat back with a dynoflow X replacing the third cat and 2 1/2 pipe out the back.
And if there's more to spend, or it's too loud, add a pair of racing mufflers to the mix.
 
Backpressure is 100% BAD. You want to get rid of as much backpressure as possible. A decrease in exhaust velocity is what can cost you power with an oversized exhaust...

Anyway, with stock exhaust manifolds, 4 catalytic converters, and still about 12 feet of pipe - cutting off the muffler isn't going to make a difference.
 
You can never convince anyone that thinks engines need back pressure that they don't.... velocity is the word of the day.
 
kustomizingkid said:
You can never convince anyone that thinks engines need back pressure that they don't.... velocity is the word of the day.
Click to expand...

Velocity - The rate in change of postition - Or V = D/T

Velocity, Distance and Time


  1. Velocity, Distance and Time


    It simply relates velocity (speed) with distance and time:


    img19.gif



    Since the units of velocity are length/time (m/s, miles/h, etc.), the dimensions of this formula are correct.
    Examples. If a bullet travels 1000 m in 2 s, what is its velocity?

    img20.gif



    How long does it take for light to travel to Earth from the nearest star other than the Sun? Here we need to rearrange the formula:


    img21.gif



    Plugging in numbers, d = 4.0 X 1016 m and v = 3.0 X 108 m/s.


    img22.gif


    Note that here the unit of meters cancels, leaving
    img23.gif
    in the denominator which becomes seconds. Note also that I wrote the answer to two significant figures.

    One more example. If a spaceship travels at 12.0 km/s, how far does it travel in one hour? First you need to convert the hours to seconds so that the whole problem is in the same units of time.

    img24.gif
    . Now we can use (after rearranging formula ):


    img25.gif

 
I just recently had the old mufflers hacked off my Mark. Had 2 glass packs and new chrome tips installed with. Car sounds great off the start and comes to nice purrrr at 60+.
There was no loss in power. I actually had a gain. The car now runs at a lower rpm at 60-70mph. I'm not as car savvy as most but I would believe this is a gain in HP.
 
If you don't teach algebra/physics or the like Mespock, then you missed your calling. lol, Gary
 
Nitemare77 said:
The car now runs at a lower rpm at 60-70mph. I'm not as car savvy as most but I would believe this is a gain in HP.
Click to expand...

No, it sounds more like a mistake. The gearing didn't change, only your perception. This is why anecdotal performance information is so unreliable.
 
If the RPM changed at cruise due to a muffler change.... well thats just not going to happen.... the sound of the RPM at cruise changed, not the actual RPM.
 
I understand this is hearsay, but it is what I have noticed. At 70 the car would run a little over 2k rpm. Now its a little under. I picked the car up last night from the painter and even watched it then while I was driving it home. I must be seeing things then or my memory is very poor from the pre installation. :(

I am ecstatically happy to get the Mark back from the painter thou ( I'm working on getting some pics put together to share).
 
Last edited:
Nitemare77 said:
I understand this is hearsay, but it is what I have noticed. At 70 the car would run a little over 2k rpm. Now its a little under. I picked the car up last night from the painter and even watched it then while I was driving it home. I must be seeing things then or my memory is very poor from the pre installation. :(

I am ecstatically happy to get the Mark back from the painter thou ( I'm working on getting some pics put together to share).
Click to expand...

Its not possible because the transmission has a locking torque convertor. Only a gear change will lower RPM.
 
With no mufflers I found that there was too much drone in the car unless you could extend the pipes past the bumper. Didn't like it.. sound was cool but just annoying inside the car.
 
kustomizingkid said:
You can never convince anyone that thinks engines need back pressure that they don't.... velocity is the word of the day.
Click to expand...

Regardless of someones opinion of backpressure, its fairly certain that by the time you get 11 feet down the exhaust pipe the presence or lack of a muffler is pretty a non issue for the most part.

Any real or perceived/useable/relevant backpressure is between the cylinder head and the cats.

The performace gain from removing the stock mufflers and welding in tailpipes is due to the 80ish lbs (more if they are waterlogged) mufflers.

removing 80+lbs from the car is significant.
 
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