Straight exhaust - Will it damage turbo?

[JoeFreeman]

My father has a 94 2500 12V 4x4 and had asked me to ask you if it would hurt the turbo to run a straight exhaust (no muffler, no converter) all the way back. He mentioned something about backpressure. I'l do a search as well, but pop asked me to ask so I'd figured I'd listen for once.



Thanks for any input you can give me.



Johnny

 

[J DeMaio]

From what I've heard, no. I think it actually helps the turbo because there is less backpressure against it and the less you have the better your turbo will work. There are many people with Cummins powered Dodges that are running straight-pipes and haven't had any trouble. Hope this helps! I'm about to do this to my truck.

 

[RHARVEY]

No it will not hurt the turbo! It would seem that with less back pressure it would have less pressure on it. Mine has been straight for nearly a year. .



Rick

 

[BCFAST]

Backpressure?

This will HELP your turbo immensely! Im no engineer (you may hope for Pier's input on this) but it would seem logical that, as a turbo charger is a simple pump, it would not like back pressure of any sort... . would make it inefficient. By opening up your exhaust, your exhaust temps will fall dramatically, spool-up will be quicker, and your mileage will increase. Enjoy the noise!

 

[turbonatr]

Re: Backpressure?

Originally posted by BCFAST

This will HELP your turbo immensely! Im no engineer (you may hope for Pier's input on this) but it would seem logical that, as a turbo charger is a simple pump, it would not like back pressure of any sort... . would make it inefficient. By opening up your exhaust, your exhaust temps will fall dramatically, spool-up will be quicker, and your mileage will increase. Enjoy the noise!

Ditto that!!

 

[Fastmach]

Hi Rocket I can understand your fathers concern. as stated by other who have done this, it probably will not cause a problem. The only detremental thing that I could see happening would be the possible overspeeding of the turbine and over boost of the engine, which with this big brute should be of little concern. I'm probably more sensitive to this than most, because I flew B-24s in WW2. closing off the exhaust gate aft of the turbo caused more pressure to excape through the turbine blades. Too much or to sudden would cause an overspeed of the turbine and a rapid shedding of the blades which came like shrapnel thru the fuselage. If they did not fail, the over boost would likely cause a couple of blown cylinder heads. Lack of back pressure on the turbine will cause an increase in its speed. Careful ot there, things may not always be the way they seem or are engineered Fastmach

 

[Jeff H]

The less restrictions you have from turbo to tale the better it will operate and perform. I've seen farm machinery and construction equipment running strait piped. Look and here the next time a semi passes you. You'll know if its strait piped. There is no documented cases that I know of that ripping the muffler and cat off will ruin the motor. If you are still not sure. Talk to your local diesel mechanic. The strait pipe sound is the best sound system your truck will ever have

 

[grtescpa]

Originally posted by rocket

My father has a 94 2500 12V 4x4 and had asked me to ask you if it would hurt the turbo to run a straight exhaust (no muffler, no converter) all the way back. He mentioned something about backpressure. I'l do a search as well, but pop asked me to ask so I'd figured I'd listen for once.



Thanks for any input you can give me.



Johnny

Removing a muffler only hurts gas engines which are tuned for it. More so on air cooled gas engines. When the muffler has been removed from a motorcycle engine the loss of back pressure causes the mixture to run lean and overheat the valves. Thats why you hear of profesional race mechanics rejeting the carbs. Just a little education on that subject.

 

[Jones]

Johnny, I'm with everybody else. The less backpressure the better a diesel likes it. As far as damage to the turbo goes, I think you would have to run from the turbo to the atmosphere with no exhaust system at all to get close to hurting the turbo.

Mine all have seemed to be pretty bullet-proof.

Hope this answers your question. Jones

 

[JoeFreeman]

Thank you very much for all the responses. I'm sure my Dad will appreciate all the help.

Thank you again,

Johnny