And yet another one of these exhaust questions (sorry)...

[impalator]

Spoke to a guy with an L300 yesterday near the MacDonalds by the Canadian Tire in North Vancouver – I actually heard him step on the gas of his Delica and it sounded… well (if I may use the word), quite potent… In other words, it wasn’t the sight of the Delica that made my head turn.. but the sound of it… (imagine, there is a healthy Diesel roar, you turn your head to take a look… and … there is no big Cummins powered truck or so… just a cute Delica…)

I ended up talking to the guy and he told me that he basically runs a pipe ride out the side of the Van from where the post-turbo down-pipe comes down, without a muffler, silencer or anything… Talk about eliminating back pressure….

Now, I once had totally rusted-out muffler on my 1300cc Ford Cortina… and that baby, despite the small motor, was loud, even in idle….
The interesting thing is: This guy’s Delica idled almost as quietly as a normal Delica (with muffler) would, and upon slight acceleration still didn’t sound particularly “extraordinary”. It was just when he hit the gas where my head turned...He told me that when he’s doing uphill under full load, it’s apparently veeery loud..

And this brings me to my question: I am considering the Cherry Bomb thing that was discussed in a different Thread as my original exhaust is on its way out – and while I don’t mind a bit louder, throatier, roarier, I certainly don’t want the most obnoxious, loudest Delica around when going up the hills… especially when travelling with family or going up a hill in a nice neighbourhood in the middle of the night…

What can I expect in terms of “loudness” from a Cherry Bomb . The Cherry Bomb obviously wasn’t designed for Diesel engines…
Does anybody have any suggestions as to reducing back-pressure (i.e. 2.5 in or more pipe) and a less restricting muffler without waking up the entire neighbourhood?

Does anybody have or know of a Youtube sound comparison of a “tame Delica” vs. a “wild Delica”?

Thanks and cheers,
Chris

[Erebus]

Given how the enforcement types like to pick on RHDs you might not want to have a loud exhaust. A 1.5" exhaust with normal muffler won't cause too much back pressure, and won't restrict much either. IMHO

[jessef]

I put a 2 1/4" exhaust with a cherry bomb $40 muffler (the one made for Turbo diesels) and it sounds great.

Straight pipe is not worth the mind-numbing roar, let alone attention from the law.

The cherry bomb 'classic' tube is best for a car, not a diesel.

There are different cherry bomb (make) mufflers. Get the turbo one for diesels. It's cheap and sounds throaty but only when you floor it. Cruising, it's quiet and nice.

[NoDelie]

The first week i drove my 89 pj i broke the pipe just before the muffler. Went to parts source and made a side pipe and it dose sound like the dodge. Went from a 1.5 to a 2.25 pipe. I can see and hear the pipe from my drivers side mirror and window. I love it. It is only loud under load. Saying that i get a little more throttle happy. Also hear the re verb of the turbo. Hope the no back pressure dose not hurt it.

[pajerry]

I've been wanting to do a side exit like that, but was hoping I could tuck it in a little better or it will get ripped off in no time. Any thoughts on emptying it in to the wheel well, but not to get in the tires way when stuffed? My only concern were the fumes comming in the cab more from under or the windows or something.

Right now, I can't ever see smoke comming out the back, and it wasn't until I was heading north on the sunshine coast at night, tryign to keep a speed of 80km/hr average. The only reason I saw it was from the lights behind me, so now Im wondering if its always like that or if its just clear fumes I saw, or what.

Man i need a pyro..

[NoDelie]

No fumes enter the cab,because it is 2.5 in beyond the running boards. You must have the pipe be equal or beyond the body line or you will get fumes in cab. Yes i considered the fact of the pipe getting riped off if i was 4x4ing, but i just play in the mud for now. It is best to run the pipe over the rear axle and shoot it out the back. As you can see my pipe is close to the bushing and stabilizer?, if you make the 1.5 pipe about 2 in shorter you could tuck it about 1 in higher and closer to the running boards. There for now in front of the rubber bushing. but closer to your leg. ouch hot. Still love the noise Just thought of this while i was taking the picks. You could bring the bend just in front of the stabilizer at a 90 degree then along the frame and then 90 it again to come out just in front of the rear wheel. I might try that so it is cleaner and tighter to the body and i wont worry about the rubber mount. Thanks for the mind jog.

[impalator]

Thanks for the feedback so far… I am really trying to work out something interesting for my “up and coming” side-dump system…
I recently came across a Mr. Gasket 2 inch Exhaust Cut-Out which is cable operated… And then there is of course the electric operated cut-outs….
The pros:
- Cable operated: It’s relatively cheap… (much cheaper than electric valves)
- It allows to run quiet, for city or neighbourhood driving…. And loud for when extra power is needed (how much extra power will it give though…?)

The cons:
- According to some internet research I did, they are notoriously leaky (which, with a diesel, can and likely will be a dirty affair)
- In order for the cable to be mounted, some kind of mounting rail or so will have to be constructed
- In addition, a whole must be drilled and a cable pull mount on the inside of the cab will have to installed
- Last but not least, the Mr. Gasket cable operated ones only come in a 2 inch diameter….

My plan was to install a cable or electric operated cut-out right below the downpipe-flange (after the turbo and spring-flange assembly) and then divert two pipes that run parallel… one features some standard muffler, the other runs straight.
Before the endpipe, the two meet up again with a Y-section so that there is still just one end-pipe dumping… depending of which pipe I choose with the controlled cut-out, the exhaust will go out unsilenced direct, or run through a regular muffler (hence, I can run it quiet… or if needed/desired, loud). (See picture)



In order not to have a low lying side exhaust that could easily touch debris or curbs when parking etc. I was planning on cutting a hole into the side panel (see picture) and lead the pipe through that … my only concern with this is that the exhaust gets really hot and the lower part of the side panel is plastic… aside from the fact that the metal behind the plastic side panel would require quite extensive body work to accept a 2.25 or 2.5 inch pipe through it…. (see picture… tried to manipulate a picture of my Van to show my intention)…



Anyway… I’ll keep dreaming as all of this may prove just too elaborate and too expensive to do and the gain as far as improved fuel mileage and/or power will likely be marginal (but I like dreaming….
I guess, what I’ll end up doing is just a 2.25 in pipe from the downspout to a Diesel-Cherry Bomb and then a 2.25 or 2.5 out the side… That appears to be the cheapest “fix”….

[jessef]

Too much work for that split exh.

Just do the simple 2.25" flange -> pipe -> muffler -> side exit.

Best bang for the buck.

Pajerry. Don't stuff it in the wheel well. Can get messy and hot in there.