Straight Piping A 6.5 Detroit

angelic0- · January 28, 2010

I'm debating my father on this, i've designed a 3" Straight Pipe with a Y pipe and dual 2,75" Exits that i'm going to install in his truck..

He thinks the truck will not benefit off of this, i think it will...

OEM on the Truck is a 3" pipe going into the Catalyc Convertor (Soot Trap) and 3" out of it going into a Muffler with 2,25" coming out of it and out the rear...

I told him EGTs would build up since the pipe coming out of the Muffler is only 2,25" and by removing the soot trap and muffler EGTs would lower resulting in lower consumption...

Then there's another QUESTION, are you able to make the 6,5 roll coal (spew black smoke) ? Can you retard the timing on the pump or add boost ?

What can be done to increase power on the 6,5 without adding tremendous wear on the engine. Truck already has around 100.000 miles on the clock !

gmtech4 · January 28, 2010

the engineers don't know what they are doing when they designed the truck,and you want to piss off your neighbours with noise and spew black smoke,

grow up ya little shit

angelic0- · January 28, 2010

the engineers don't know what they are doing when they designed the truck,and you want to piss off your neighbours with noise and spew black smoke,

grow up ya little shit

Don't see where this reply answered my questions...

ybsane · January 28, 2010

I'm debating my father on this, i've designed a 3" Straight Pipe with a Y pipe and dual 2,75" Exits that i'm going to install in his truck..

He thinks the truck will not benefit off of this, i think it will...

OEM on the Truck is a 3" pipe going into the Catalyc Convertor (Soot Trap) and 3" out of it going into a Muffler with 2,25" coming out of it and out the rear...

I told him EGTs would build up since the pipe coming out of the Muffler is only 2,25" and by removing the soot trap and muffler EGTs would lower resulting in lower consumption...

Then there's another QUESTION, are you able to make the 6,5 roll coal (spew black smoke) ? Can you retard the timing on the pump or add boost ?

What can be done to increase power on the 6,5 without adding tremendous wear on the engine. Truck already has around 100.000 miles on the clock !

I don't know the year of the truck so I will give a basic idea. Go with a bigger cat-back system and than go with a good hand held programer if you want additional power and smoke. All of my buddy's who compete in truck pull's use the Cummins motor, so I am aware of all of the performance tricks for them.

If you get us the information about what year the truck is and if its manual or automatic I can ask them and give you some better feed-back on what to do to make it run cooler on the EGT's and get you more performance + mileage.

The Engineer's are just limited to make everything EPA approved for Diesel's. I run a Ford-550super duty for work with a 6.0 and I am on a first name basis with the service manager at my local Ford Dealership... The mechanic's know how to make the better imo, because they have to fix what the Engineer's missed on the CAD design.

jro909 · January 28, 2010

i diden't realisde people still drove detroits my god, just put a bullet in it and get the man a duramax

thearborbarber · January 28, 2010

Do a google search for 6.2 6.5 diesel forum. It'll be the only address that makes sense. They have a lot of good info.

Nytemare · January 28, 2010

I would take a Detroit over a d-max any day.

Is this engine a turbo diesel? If so....you can run a 5" exhaust on it....the bigger the down pipe the better, the faster the turbo will spool.

Have a look at a banks monster exhaust and build a copy of that.

angelic0- · January 29, 2010

Truck is a 1996 6.5 TD, 100.000km and in great shape, it's almost as it rolled off the assembly line within a year

We tried Straight piping it, to see if that would help at first, with a single 3" pipe going out the back.. turbo-back...

Sounds awful nice and you get that nice turbo whistle, not to aggressive...

The biggest pipe we had and could bend was 3", i will be able to mandrel bend 5,5" maybe 6" this summer...

I will inform you on the consumption and EGTs within the next few weeks

Nytemare · January 29, 2010

Truck is a 1996 6.5 TD, 100.000km and in great shape, it's almost as it rolled off the assembly line within a year

We tried Straight piping it, to see if that would help at first, with a single 3" pipe going out the back.. turbo-back...

Sounds awful nice and you get that nice turbo whistle, not to aggressive...

The biggest pipe we had and could bend was 3", i will be able to mandrel bend 5,5" maybe 6" this summer...

I will inform you on the consumption and EGTs within the next few weeks

Like I said man...have a look at the Banks exhausts....fab up one thats similar to that.

http://www.bankspower.com/products/show/309/4

That's one for an 01 D-max...its 4" all the way back....they make the truck sound like a big rig. Most guys I know run a single 4" pipe on they're diesel...or larger. I know a couple guys running true dual 3.5" pipes on a 6.5L Isuzu diesel (some of the 6.5L's here in Canada were made bu Isuzu, for Chevy, best engine out there after you swap the head bolts out for head studs and upgrade the head gaskets to 5 layer copper).

ybsane · January 29, 2010

I talked to my buddy's who pull with their trucks, they say that the 96-01 parts are interchangeable and it doesn't take much to make some power in them. Like Nytemare said, get a big ass straight pipe on there and them get a programmer for it and you could be set. They also said you will make more power with that motor than the Duramax.

Try http://www.heathdiesel.com/

They have some stuff you can use on their site. EGT's will go down with the cat/muffler delete and free up some top end power in that truck. I don't understand where some people thing you should shoot that motor.

This is a local place that we attend and yes the name of the town is Big Lick.... Only in the South

http://www.biglick-festival-park.com/antiq...actor_pull.html

angelic0- · January 29, 2010

Here are sound demos:

and here:

Nytemare · January 29, 2010

Here are sound demos:

and here:

Sounds good....but with some tuning and a 4" pipe you will think you have a big rig.

Also with ybsane on this too. The Detroit is an excellent engine and will make way more power than a d-max can hope to make. The only reason it's not popular is that the aftermarket didn't do much for it...you kind of have to know what parts to get from different engines to make everything work.

clemsonblozz · January 31, 2010

Pump timing is where your power starts.. Are the pumps keyed?? I work for Cummins, and I know the older 12 valve engines could stand some pump advance.. As long as you didn't go crazy with the advance,, you'd have a smokeless, highly responsive pulling machine.. They de-nutted the engines in the dodges so the truck part would survive..

But, if you go crazy,, introducing a ton more fuel or advanced timing into an older engine,,, for every action, there is a reaction.. More fuel and more advanced timing equals more in cylinder temp and pressure..

Detroit Diesel made the 6.5?? I know some of the older two stroke 6-71's had "GM Diesel" on them, but I wasn't aware that the 6.5 was made by DDC

Nytemare · January 31, 2010

Pump timing is where your power starts.. Are the pumps keyed?? I work for Cummins, and I know the older 12 valve engines could stand some pump advance.. As long as you didn't go crazy with the advance,, you'd have a smokeless, highly responsive pulling machine.. They de-nutted the engines in the dodges so the truck part would survive..

But, if you go crazy,, introducing a ton more fuel or advanced timing into an older engine,,, for every action, there is a reaction.. More fuel and more advanced timing equals more in cylinder temp and pressure..

Detroit Diesel made the 6.5?? I know some of the older two stroke 6-71's had "GM Diesel" on them, but I wasn't aware that the 6.5 was made by DDC

LOL...Yeah...that was kind of a bastard diesel for GM...it was made by Detroit, Isuzu and a few were made by GM in house...almost a direct copy of the Detroit design.

The Isuzu's were capable of producing the most power, and were also the more problematic of the bunch...the bank 2 cylinder head used to lift right beside the firewall, intake side.

Later a fix was made for this replacing the head bolts with head studs. The Isuzu's also had a cam shaft issue...they would twist off right behind the timing gear.

With all the issues remedied, I have heard of these engines putting out upwards of 700ft-lbs in "stock" trim...Detroit's and GM's copy were capable of 550-600 in stock trim...just slightly less than a D-max