ZD 30 exhaust size?

[Mont]

wondering any thoughts on 3 inch vs 2/3/4 exhausts for the 3.0l Ive heard the guys at beaudesert are good not too far from where Im at.

[jackwalks]

wondering any thoughts on 3 inch vs 2/3/4 exhausts for the 3.0l Ive heard the guys at beaudesert are good not too far from where Im at.

G'day Mont,

I have a 3inch Manta system, very happy with it so far.

[mudski]

I can only speak on what I have. 3inch Redback system with no muffler and hi flow cat. BD systems I see always recommend 2 3/3inch. Some say that 3inch is too much and the smaller size gives you a little back pressure which you apparently need. I asked a customer of mine from a few years back who does exhaust systems for a living about this. He told me on a turbo diesel you need a system from intake to the end of the exhaust to be as free flowing as possible. The turbo does a fine job of creating enough pressure in the intake manifold.
But the only way to prove this would be to have both systems for the one vehicle and do a dyno test with each pipe. I would be keen to see the results.
So the zorst I have works good. Just contemplating now about removing the cat. Shhh!

[MEGOMONSTER]

I went with 3" Taipan on mine, 2011 3.0lt. Definitely an improvement over stock.

[kevin07]

wondering any thoughts on 3 inch vs 2/3/4 exhausts for the 3.0l Ive heard the guys at beaudesert are good not too far from where Im at.

comes down to what model you have so if you could let us know would help. firstly a di or prior to late 07 I would say go the 3 inch but add your gauges and dawes valve to stop overboost issues now if you have a crd you can cause yourself dramas if you go the 3 inch, now I have the bd exhaust and its great and egr block and I don't have boost issues but I know some do have issues with the 3 inch

[mudski]

What dramas could you cause kevin07?

[threedogs]

I have a 3" straight through system with sports Cat on my 04 Di.
The BD 2.75" system some say is perfect for the Common rail 3lt
Combined with a chip you'll get the most benefit from the exhaust,
along with EGR block.
What year is yours??
Lets face it they are pretty much choked from the factory

[Mont]

Hi All its a 3.0 Di 2004 model and yes the over pressure issues i think need to be addressed first. Still feeling nervous till i get the gauges and dawes installed etc. mudski do you recommend any particular gauges ? and what px range for the boost gauge will be neded? Cheers M

[threedogs]

zero to 30 for boost , have you brought the pillar pod yet?
Also get the pyro in centigrade
VDO make a good gauge as do Autron, I run Speco white face
with no problems at all

[kevin07]

What dramas could you cause kevin07?

me personally I can cause many dramas but may I guess your talking about 3 inch exhausts well many people suffer overboost and limp mode