Aftermarket exhaust system

Bucky that is SOME discount!
So that is what materials cost I guess. Hope you threw in a carton.
Good stuff.
Jeff.

"from about 300m back from the engin pipe"

Hi Bucky,

is there any reason you started the 2 1/2" here? why didn't you start it at the turbo, or is this not an option on the Navara? I would have thought the smaller pipe between your turbo and the 2 1/2" system would defeat the purpose of the whole excercise, but obviously with power gain this is not true. Great "mates rates" too.

Cheers, Trevor.

Bucky, if you Navara is anything like the Patrols you economised on the bit you should have spent money on. The important bit is the bit from the turbo and it frequently costs $250-$300 and that is the dump pipe. It can be v.e.r.y restrictive and it's replacement gives the torque and power boost. On the 4.2 for instance it has less than half the volume the upgrade provides.

Trevor ,, John ,, Jeff
I originally wanted a 3" system from the turbo !
But mate recons in his years working as an exhaust , that if it was a 6 cylinder, he would use a 3", but the 4 cylinder turbos only needed a 2 1/2" to get rid of the gasses, and that they also needed a little back pressure, to get the turbo kicking along.
I can only go on what he tells me, and he is genuine, will do the same to his own, as soon as he gets it, ( looking now )
All I know is that there was an immediate power boost of about 10-15 %.
Towing seems a lot easier.
On fuel consumption, nothing noticeable, maybe .05 km / lt difference, thats driving to and from work.
When towing the camper, on our last big trip, and the Mrs had everything except the kitchen sink, weight 1250kgs, we did 6,500 kms of desert, gibber, sand, and a bit on the black top, on 1000 lts diesel.
Apparently thats equivalent to a loaded up 6 cylinder diesel anyway, but we had a lot of gear too.

Cheers All
Bucky

Hi Guys,

Just stumbled upon this thread. Have to agree with Trevor & John here - turbo outlet pipe/elbow restriction is a major part of the total restriction in many standard systems. And the bit about "they also needed a little back pressure, to get the turbo kicking along" is very dubious. Your mate might be a very competent exhaust fabricator and give very good deals but he's off the mark here.

All turbines will give greater output and accelerate faster given a larger difference between inlet pressure and outlet pressure. So the lower the 'back pressure', right at the turbo outlet, the better the turbo will respond, always.

On pipe sizes, it's the cross-sectional area of the pipe that determines its capacity for flow. If we agree 3" is a good size for a 4.2TD, then a 3" ID pipe has a cross-sectional area of 7.07 sq in. A 2.5" ID pipe is 4.91 sq in X-section area, 69% of the 3" pipe. A 3.0L engine is 71% of the capacity of a 4.2L, so the ratio of pipe sizes to engine capacity is about right - if both engines have the same specific output (kW/Litre).

But most 3.0L engines have a higher specific output than 4.2's (more KW/L, therefore more exhaust volume/L), so a slightly bigger pipe might be the go. Don't know if 2.75" is an available size but 2.75" ID pipe would be 5.94 sq in X-section area, 84% of the 3" pipe.

Ian,
You're comments are encouraging.
Our 3L Rodeo is getting a 2.75" Beaudesert exhaust as soon as we get the dieselgas maze sorted.
Do you have much experience with dieselgas yet, particularly exhaust temps.?
Regards,

Jeff

Hi Jeff,

Sorry, no first-hand experience with dieselgas. But all the owners we've spoken to, at several caravan parks from Tassie to Qld, seem very happy with their systems - both power gain and economy, including towing.

I'd love to try it but it's far too expensive to get a good payback on our 10 year old, 235,000 km Disco 300Tdi. (Trying to find an autogas installers course so I can perhaps do my own sometime...)

The general consensus is that LPG injection actually lowers peak EGTs but I've not had the opportunity to measure it myself.

Thanks Ian. Seems to be too good to be true. Been watching for 10 months, and can't fault it, so time to join the ranks.
Jeff.

Hi Guys , I just spoke to Shane from B,D,E and for my 100 ser from back of turbo the lot out of 3" Aluminized tube 2 mufflers made in shop ? supply $930 Fitting $100 or shipped to SYD in bubble wrap $85 he sounded switched on to me ? wot do you guys think !!

Regards J.B.

me too norm

J.B

That's the going rate from these guys. They do a have good workmanship and you won't be disappointed. You will remember the extra HP long after you have forgotten the price. I have one of their pipes but other than that, no affiliation with them.

Cheers Trevor.