What's your favourite diesel muffler for a BJ60?

[acer]

can too big of pipe negatively affect engine performance? Does the 3b need some back pressure?

[peterdouglas]

Originally Posted by 83bj60

it's oriented to the outside and down, a simple 24 inch or so length of pipe from Canadian Tire that cost less than 20 bucks.

They're a bit expensive, though. They can cost as much as $40!!! I'd shop around first...

Wait till you see the pictures of that old install before you jump with joy, although it still works nice, it looks pretty grungy now . The whole thing probably cost me no more than $120 at the time...

Now that I've seen that muffler on the straight truck, with the tailpipe pointing down, I'd really like to incorporate that idea into my exhaust. Thanks again for the tips. I'm not rushing into anything, although I'd like to have the new exhaust done before the end of September.

[cruiser_guy]

Originally Posted by acer

can too big of pipe negatively affect engine performance? Does the 3b need some back pressure?

Re-read this thread paying particular attention to this question!! (I posted the response to this very question in post #43)

[bunja]

I put an areoexust on my 85 bj60 first thing. Mostly because when I aquired the rig the muffler was dying and I had a turbine on hand. Turbines create a vortex, which instead of having no restriction, it creates a vacume. I noticed quite a difference in performance as I have with my 4runner. As well as a 10-15% increase in fuel economy. The only negative efffect in the cruiser (none really in the runner) is a huge BRRRAAAAP at about 1800 rpm (most likely because of resonance). When she gets out of the body shop, I will turbo it. If the resonance problem is still there I will go with a resonance reducer or silencer from the same company.

[83bj60]

OK - Aeroturbine... How does it compare to the Magnaflow? Both are low restriction and claim torque an HP improvements...

[bunja]

Originally Posted by 83bj60

OK - Aeroturbine... How does it compare to the Magnaflow? Both are low restriction and claim torque an HP improvements...

Couldn't tell you. I have never used magnaflow. There are dynamo charts on the areo exaust web page if you search around. every on that I have looked at show a good increase. I can also say from having two vehicles with them, they work well. If you consider one, I would encourage either a resonator, or muffler to go with it. If you ask a sales rep, they should be able to tell you which component goes with which.

[cruiser_guy]

Originally Posted by 83bj60

Both are low restriction and claim torque an HP improvements...

The low restriction is WHY they have torque and HP improvements. Save your money and ELIMINATE restriction be leaving out the muffler completely!! You'll probably see even more torque and HP improvements over ANY muffler out there.

[peterdouglas]

Originally Posted by cruiser_guy

The low restriction is WHY they have torque and HP improvements. Save your money and ELIMINATE restriction be leaving out the muffler completely!! You'll probably see even more torque and HP improvements over ANY muffler out there.

But without turbo, the exhaust would be quite loud, wouldn't it?

I like the idea of no restriction, but need the truck to be reasonably quiet (well... as quiet as a diesel truck can be)

[83bj60]

Originally Posted by bunja

Couldn't tell you. I have never used magnaflow. There are dynamo charts on the areo exaust web page if you search around. every on that I have looked at show a good increase. I can also say from having two vehicles with them, they work well. If you consider one, I would encourage either a resonator, or muffler to go with it. If you ask a sales rep, they should be able to tell you which component goes with which.

Magnaflow have similar claims... As for the sound, I heard both from the same type of truck (Cummins diesel in a Dodge RAM), one after a AeroTurbione, one after a Magnaflow and frankly, I couldn't hear much of a difference!

How is a resonator built?

[83bj60]

Originally Posted by cruiser_guy

The low restriction is WHY they have torque and HP improvements. Save your money and ELIMINATE restriction be leaving out the muffler completely!! You'll probably see even more torque and HP improvements over ANY muffler out there.

Yeah, I'm tempted!!!

[83bj60]

Originally Posted by peterdouglas

But without turbo, the exhaust would be quite loud, wouldn't it?

I like the idea of no restriction, but need the truck to be reasonably quiet (well... as quiet as a diesel truck can be)

Haven't gotten to take pictures of that muffler installation we were tallking about yet, but I can assure you it's quiet enough

[cruiser_guy]

Originally Posted by peterdouglas

But without turbo, the exhaust would be quite loud, wouldn't it?

I like the idea of no restriction, but need the truck to be reasonably quiet (well... as quiet as a diesel truck can be)

Yes, without a turbo you need some kind of muffler or you'll go deaf! Hearing is more imprtant than a few extra horses.

[83bj60]

cruiser_guy, I can't remember what your setup uses.... You have a turbo, do you actually use a muffler? If not, what was the difference in sound, could you describe it?

[cruiser_guy]

Originally Posted by 83bj60

cruiser_guy, I can't remember what your setup uses.... You have a turbo, do you actually use a muffler? If not, what was the difference in sound, could you describe it?

I have NO muffler, resonator or any other device to reduce noise output. From the turbo back it is simply pipe. The actual sound level is no worse than the OEM exhaust system during normal driving with the windows up (no throaty rumble or any other noise other than what you hear in a naturally aspirated 3B). I had the OEM exhaust before I went to the turbo. With the windows down when driving in a tunnel or next to a highway divider there is a definite throaty noise like what you'd hear from a Harley Davidson. You also get that noise if the tailgate is open because you're carrying something long.

Outside of the truck at idle you hear a more throaty noise at the back but otherwise it's not at all worse than OEM.

Depending on the turbo you may head it whine sometimes but that's at a very low level.

Remember the pipe from my turbo follows the original exhaust route so there are several bends involved. The noise output from a system that routes directly to the back or uses fewer bends my be different. Bends act to reduce noise travel down the pipe.

One change I had to make to the straight pipe system was the last hanger. There was so much thermal expansion occuring in the exhaust that the final support kept breaking. Eventually we went to a strip of rubber in the shape of a sideways "U" to allow the pipe the 1" or so of expansion travel needed from cold to hot. Otherwise the system has not had any work done to it in the 4/5 years since it was installed.

[peterdouglas]

Back to the original topic of this thread, I did a lot of thinking lately. Upon closer examination, I noticed that not only was the front pipe still OK, but so was the muffler, although it was mounted upside down (the drain hole is in the wrong place). The only really bad part was the intermediate pipe which was patched in about 3 places, and the tailpipe was rusty.

There were two logical choices:

1. Replace the bad intermediate pipe and tailpipe, which is about half the length of the entire exhaust ($200 cash, no receipt)
2. Go all the way and get a good quality custom exhaust, front to back ($600 to $1000 + tax, or a partial exhaust at Midas for $450 + tax - for an intermediate pipe, muffler and tailpipe)

Since my funds are a bit limited right now as I plan for my move out west, I opted for choice #1. Man, I never knew a BJ60 could be so quiet! I can actually hear other noises I was never able to hear before. No more raspy exhaust! And I'm quite confident the exhaust won't break apart on the 4000+ km drive out west and make me go deaf. It will probably last a year or maybe even a few years.

The guy also put on a tailpipe with a downward spout. Although it still comes out at the back in the stock location, I'm hoping the diesel soot will go on the ground and not on the car parked behind me or on the garage door (I always back in). Not sure if this new setup will last a long time or not, but when it goes, I'll get a nice custom exhaust front to back, no expense spared. Thanks for all the great tips. I know how to put together a great exhaust for my BJ60 now. Not sure if I'll add turbo, but it's up for consideration.

[83bj60]

Good choice, as it's invariably the back that wears out first (condensation).

If you ever wish to put a 'short and sweet' muffler, here's a couple of pictures I took yesterday of the setup on my old rig.

Whatever you do, don't you comment on the rust and the state of decay of the system!!! That truck has lived more than 23 years in Quebec used daily in the salt and sand of winters and done more 600,000 in those conditions!!! It's under restoration now!! Bon!!!

The pictures are simply meant to show how a simple muffler system can be made to fit in that space below the passenger seat, between the frame and rocker panel (what's left of it anyway )

Chris

[peterdouglas]

That looks like a good set-up! I was thinking of something like that, but wasn't sure how it would look. I'll definitely keep that in mind for my custom exhaust set-up, whenever that may be now.

As for the rust, it doesn't look that bad. My BJ60 spent 22 years in la belle province aussi! Oil sprayed every year at Métropolitain by the first owner, and by me this year (though there was a second owner from 2003-2006 who didn't seem to do much maintenance, he just drove it). But, mine has only 332,000 kms. BTW, I used to live in Montréal and the West Island, but bought the truck in Ontario.

[83bj60]

Thanks for your understanding... I HATE rust!!! Can't understand why they can't make cars that DON'T! Probably because they DON'T CARE... As except for where we live and few other areas, cars are not subjcet to the abuse our roads department and our climate subjects them to...

I have still not rustproofed my HDJ81... Look at how it is from underneath... quite a difference, isn't it!!!

For rustproofing the best thing to do here is to REMOVE the internal panels to access all the crevices... Done like that, after 7 yeasr even a lowly Suzuki presents practically no rust (and they are renowned for rusting fast).

But taking the whole insides apart!!! Hmmm... I don't think I'd have the nerve... I'll end up doing the undersides myself and shootiong the doors and panels at Métropolitain or some other place like that...

[peterdouglas]

Good idea on the taking out the interior panels to do a good job on the rust proofing. A lot of work, but certainly worth it!

Your HDJ81 looks really clean! It almost seems a shame to expose it salty roads...

[Benihana]

So I have read this thread as I am looking for a good muffler solution for my naturally aspirated BJ60. I have noticed no mention about catalytic converters.

My question for those who know is, do diesel engines need a catalytic converter for emissions reduction?

I assume that because diesel engines do not produce the same crappy NOx emmissions that gassers do that they do not.

Just wanted to clear the air.

Ben

[87 HJ60]

Just go with how it came from Toyota. My 87 HJ60 doesn't have a catalytic converter. Considering the cost of a new catalytic converter you'll end up paying a whole lot more if you plan on doing your exhaust.
BTW are the BJ60's exempt from BC's AirCare program?

[cruiser_guy]

Ben, if you're naturally aspirated and plan to stay that way, go with the stock exhaust from Toyota. Catalytic convertors are NOT required on any but the newest diesels (and those are different from gassers anyways).

[Granite Grinder]

Originally Posted by 87 HJ60

BTW are the BJ60's exempt from BC's AirCare program?

Not exempt, but they do have a special lane for 4WD/ all wheel drive. They only give an idle test. I've never had a problem passing Aircare in a diesel LC, even fairly smokey ones.
GG

[cruiser_guy]

Originally Posted by Granite Grinder