[gmoney69]

hey guys, im thinking about getting a smoke stack kit from black cloud diesel..i was going to delete the cat and muffler.today i untighend the downpipe bolts to see if i would like the sound. At idle it sounds stock, but idk if that is because some of the noise is still going through the cat and muffler, when i drive it, the truck sounds awesome around 2500 RMP and up. Is it safe to leave the downpipe unbolted from the rest of the exhaust or should i tie it back up to the exhaust untill i get my kit?

Thanks alot, Jay

 

[warrenpouyer]

Dude,

I'm thinkin thats a real bad idea....

Not to beat a really dead horse but, Backpressure has been kicked around here like a readheaded stepchild!

I do have a Turbo Back Aftermarket Exhaust system on my truck,
But I would NEVER try to out think the engineers that tested & designed it!

I remember in the 70's & 80's when the big four Japanese Motorcycle Manufacturers (Honda, Yamaha, Kawasaki & Suzuki)found that finely tuned exhaust systems gained them mucho horspower on their 2-Stroke Roadracing & Motocross Bikes. /ubbthreads/images/graemlins/biggrin.gif

Those hand built pipes were works of art and extremely expensive too
they spawned the enormous aftermarket Exhaust system market for all types & brands of motorcycles! /ubbthreads/images/graemlins/eek.gif

So, If it were my truck I'd leave it installed AS INTENDED by the manufacturer...(they kinda know more about it than I do)

Regards
JR44

 

[gmoney69]

ok,, i heard somebody around here talking about turbos and backpressure how you dont need it..

so do you think its a bad idea to delete the cat when i install my kit?

 

[1olddog2]

why take the chance ????????? soot may build up under hood too???

 

[We2Speedy]

My Handshake has 32k No Cat - No EGR (unpluged it at 23k)- No problem....Just a mean sound and will pull to no end.....

 

[juggernaut150]

[ QUOTE ]
Dude,

I'm thinkin thats a real bad idea....

Not to beat a really dead horse but, Backpressure has been kicked around here like a readheaded stepchild!

I do have a Turbo Back Aftermarket Exhaust system on my truck,
But I would NEVER try to out think the engineers that tested & designed it!

I remember in the 70's & 80's when the big four Japanese Motorcycle Manufacturers (Honda, Yamaha, Kawasaki & Suzuki)found that finely tuned exhaust systems gained them mucho horspower on their 2-Stroke Roadracing & Motocross Bikes. /ubbthreads/images/graemlins/biggrin.gif

Those hand built pipes were works of art and extremely expensive too
they spawned the enormous aftermarket Exhaust system market for all types & brands of motorcycles! /ubbthreads/images/graemlins/eek.gif

So, If it were my truck I'd leave it installed AS INTENDED by the manufacturer...(they kinda know more about it than I do)

Regards
JR44

[/ QUOTE ]

Thats the dumbest comparison I have ever heard. Despite what you think two stroke ********* ***** bikes are not the same as diesels. Wow, don't give input if you have no idea what your talking about. Yes two stroke gas engines need back pressure to run properly in their powerband. However a diesel will run without back pressure how many times does this need to be explained. You have enough backpressure forcing the exhaust through the turbine housing alone.

You said you don't want to mess with what the engineers who designed your exhaust system gave you. Well, for as much faith as you people have in ford and the aftermarket for the performance possibilties of exhaust sytems, they're still accomplishing one goal... to be street legal and push the exhaust out the rear of the truck, I mean [censored] if they could they'd put f'ing zoomies through the hood. But they can't so don't piss your pants about changing the exhaust configuration if your not worried about being Street legal. Then again even if you are there are many possibilities besides the shitty stock exhaust.

 

[oldmikegraham]

Now that post made me laugh, a big 'ol gut buster laugh!

 

[gmoney69]

/ubbthreads/images/graemlins/smile.gif haha

 

[04crew]

did anyone ever notice that supercharged fuel dragsters dont hardley have any exhaust pipes? they dont need exhust back presure to prevent re-version because the blower pressure dont give the exhaust any choice butt to "get outta dodge" !!!!!! or international in our case? another good case is the rolls powered p-51 mustang. they had 12" exhaust pipes. some early test planes tryed exhust manifolds, but they ran better without them. supercharging again raises its ugly head, haha

 

[GrampyJim]

There is a vast difference between supercharging and turbocharging. The supergharger on drag cars is regarded as "positive displacement" while the turbo is not. The supercharger is mechanically driven while the turbocharger is not.

In the case of the dragster and the P51, the exhaust systems job is to get the exhaust away from the unit and the driver as quickly and with as little weight/aerodynamic penalty as possible.

In turbo charger applications (those operated on the street, at least) the idea is to maximize pressure drop across the turbine stage while moving the exhaust to a convenient location that will minimize obstruction of the drivers view in the mirrors, offer acceptable noise emissions (I sure we can all disagree on what is acceptable)and minimize underbody obstruction (important for guys like me).

 

[firesoutmatt]

The only thing I would consider is if I did what your going to do and my turbo craps out or anything connected to it (not because of what you did ) and the dealer says it was caused by what you did just be prepared to pay for it. /ubbthreads/images/graemlins/shocked.gif