Info on exhaust system

We had a 3" Beaudesert exhaust on an 80 series wagon, Greg, and it was well made. Not overly loud, but think it used to drone a bit.

Probably did improve the performance a little, but doubt that you'd notice it much if you're towing a 3 tonne 'van.

Beaudesert give good after sales service. I neglected to tell them we had a large rear fuel tank on the wagon, and it used to rub a bit. Dropped the vehicle into them, couple of hours later they'd rectified the problem.......NO charge!

Redback make good exhausts too, and spare parts are readily available if you should ever need them. Have a Redback on my Landcruiser ute, easy fit and fits well.

Bob

Greg,
I do not have a Mazda but have the Beaudesert exhaust
I installed it myself and I can testify that each piece fitted absolutely perfectly. Professional and well made
CJ

I would be surprised if the PX BT50 isn't already at least 2 2/3" exhaust anyway.

The claim of 8-12% and fuel economy by 10% is interesting and possibly only attainable in very specific situations. There might be a slight improvement in both but don't expect to see any large quantifiable results.

I fitted the front half of a 3" BD exhaust to my 2011 Dmax. Slight increase in fuel economy. Under normal conditions there is little additional pull. Only if it's under full throttle do I notice it will go better. However that is not how it gets driven for 99.999% of it's life.

As exhaust goes further rearward the hot gas cools and loses volume. It is unlikely you need a 3" to the very back as the gas is smaller and can leave the rear sections as normal.

If a 3.2 litre engine requires a full 3" exhaust, then how does a 4.2 or 4.5 litre engine producing a much larger %age of gas (ie, another 1/3 more gas flow) volume at any one time also get away with a 3" exhaust. Puzzling isn't it?

hi greg M15
you will definetley gain some power by fitting a larger exhaust but i think the %S you quote are a bit over the top estimates/ 5-10% would be closer imho
if you craw under your ute with a set of veniers and look at the bends and crimps and measure them you will find the mazda supplied exhaust has restrictions at every bend when an exhaust pipe is mandrel bend they don't squash the pipe on the bends that's the difference between the two
i don't have a B T 50 i have a 1997 mazda bravo diesel with aftermarket safari turbo 97 kw's was 74 kw's stock std
2.5 years ago i fitted a 2.5 inch exhaust as the original had crimped bends as small as 1.50 inches and the straight sections 1.75
the mandrel bent 2.5 inch has given it a big boost and together with the 1.5 inch extension of the safari air scoop mouth the engine has very good power the turbo gauge has instant now now where-as before the above was done the turbo response was very poor and slow for the needle to rise on the dial
at present by the time i get into 3 gear the extra air as forced induction into turbo by the extended scoop is very noticeable
my son was home from cairns recently and drove it
he was amazed at the difference and wanted to know what i'd done to the old girl
cheers

Greg,
The Beaudesert is well made and the reason for the 2 3/4" exhaust and not a 3" is to stop the turbo over boosting with the chance of it being damaged.

I wouldn't be looking at fuel economy or performance with the exhaust but I would be looking at the exhaust bringing down the internal engine temp when towing. This is the reason I fitted mine.

I have a Taipan 3" system on mine which is 2 1/2" off the back of the turbo. It also has a 200 cell cat that has nowhere near the restriction of the standard unit.

Performance wise, it does rev out much better if you give it some and fuel economy is in the eye of the beholders right foot.

Here is the link to the Taipan website if you wish to have a look and compare.Taipan link

You may wish to also look at a DEA exhaust but it is 3' all the way. Many say they have had no problems with their turbos, all i will say is, the night is still young and failure may lurk down the track.

The 2-3/4" system is probably enough to give you better performance Greg, just make sure you do have a snorkel too so the engine gets more air too.
Turbo will kick in faster with better air in / out, which will be great for towing.
A larger capacity (PWR or similar) air intercooler might be a good investment too.
Maybe consider checking the trans oil cooler has ample capacity for the vehicle while upgrading things, and upgrade this if it is recommended by a trans specialist.

Had a 3" one on my 100ser TD We dynoed it before and after but didnt get the figures the OP is quoting. It did pull better and with a Safari chip it certainly was a different beast. Was a worthwhile improvement.

Also fitted an EGT gauge which was the best thing I did.

Hi Greg M15
I have heard and read of stacks of suggestions for all sorts of mods to improve fuel consumption and increase power, notably mucking around with the eng. man. chip.
Some 3" systems also include a narrowing section to induce back pressure, as the engine needs it. I bought my ute new. Not game to buy second hand. It has an air cooler. If you read how performance is increased using it, and the measure of improvement in performance, it makes me wonder why they bother.
A friend of mine who is an ace mechanic I may add, and can back that up, tells me this, You may spend $4 thou on your motor and get nothing in return. Or you may get a small increase. You wont know until the jobs done, and no one will give you a guarantee. And let me ask this, was the improvements gained from spending $4 thou? Or was there a 5 minute tickle of the chip?
I talk to mates who have altered the chip. More horse power and less fuel. Done it to the last ute. I remember they traded it with 120 th kms on the clock. What about someone who wants 300 th Kms out of their ute. Will it go the distance with these mods? What if the engine shxts itself out in the middle of nowhere. No water. No phone. Little children on board?
Some other poor bugger will end up with the old ute my mates traded.
The people who make these vehicle and give us 120 th km warranty have vast amounts of knowledge, money, and resourses. If these mods work surly with the competition in the market place they would have adopted these mod.
If you can improve fuel consumption from say 15 lts/ 100k down to 14 litres/ 100k, and diesel at $1.30 / lt, then you save $130.00 every 10 th kms.???????? Would have to do a lot of Kms to get that $4 thou back.
I know I am going to be talked down over this, but so be it. Just food for thought.

G'day Greg

I have a 3.2 litre 5 cylinder BT 50 to which I fitted the Beaudesert exhaust.
The exhaust is very well made and service is very good.
I did before and after tests with the following results....

147 151 168KW
470 492 543Nm

The first reading is standard, the next after fitting exhaust
and the last after a steinbauer chip was installed.