XT exhaust centre section

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26 Jun 2017 19:44 #1 by RobS
RobS created the topic: XT exhaust centre section
I need a new centre section from the dump pipe to the muffler for an XT. Anybody know where I can get one or do I need make one up?

Thanks

Rob

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28 Jun 2017 21:19 #2 by Holmz
Holmz replied the topic: XT exhaust centre section
If you make one up, then using V-Band clamps may be the easiest way to fit it.
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29 Jun 2017 06:17 #3 by Peter and Sandra OKA 374
Peter and Sandra OKA 374 replied the topic: XT exhaust centre section
Would be easiest to have one made by an exhaust place and as suggested use V band clamps as they are much easier to use, a 150mm flexible section at the front takes care of any alignment issues.

OKA 374 LT Van, converted to camper/motorhome,
400ah Lithiums, 1100w solar, diesel cooking heating and HWS,
Cummins 6BT, Allison 6 speed auto, Nissan transfer.
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03 Jul 2017 07:52 #4 by RobS
RobS replied the topic: XT exhaust centre section
Thanks for the advice. OKAPETE was able to help me out with an original part which does the job at the moment.

Rob

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04 Jul 2017 05:35 #5 by Holmz
Holmz replied the topic: XT exhaust centre section
Out of interest what is the diameter of it?

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04 Jul 2017 06:06 #6 by Peter and Sandra OKA 374
Peter and Sandra OKA 374 replied the topic: XT exhaust centre section
Nominally 3" from the factory but I think many LT's (ours was one of them) came with a reduction like a reducing hump just behind the flange where it joined the cast section attached to the motor. I also suspect that this was a way of limiting boost with the standard turbo rather than a bodgy join of pipe and flange, but knowing oka the latter might be correct.

OKA 374 LT Van, converted to camper/motorhome,
400ah Lithiums, 1100w solar, diesel cooking heating and HWS,
Cummins 6BT, Allison 6 speed auto, Nissan transfer.

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04 Jul 2017 07:13 #7 by RobS
RobS replied the topic: XT exhaust centre section
There is a short section of ~2.5" that mates to the cast dump pipe. The pipe then expands to ~3" for the rest of its run.

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04 Jul 2017 08:50 #8 by Peter and Sandra OKA 374
Peter and Sandra OKA 374 replied the topic: XT exhaust centre section
That was the bit that I was referring to, the Perky still pulled 17 lb of boost ex factory so it didn't restrict much.

OKA 374 LT Van, converted to camper/motorhome,
400ah Lithiums, 1100w solar, diesel cooking heating and HWS,
Cummins 6BT, Allison 6 speed auto, Nissan transfer.

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04 Jul 2017 19:15 #9 by mort
mort replied the topic: XT exhaust centre section
I had looked at that section when I was doing the turbo but it is only a transition from the dump pipe to the 3" exhaust it does look from outside as a restriction but from inside it is a smooth run if anything the baffled muffler was the restriction planed or not.
Martyn

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04 Jul 2017 20:51 #10 by Holmz
Holmz replied the topic: XT exhaust centre section
Does it actually need much of a muffler with the turbo between the valves and the end of the tailpipe?
(A waste gate bypass would make a racket though.)

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05 Jul 2017 05:13 #11 by Peter and Sandra OKA 374
Peter and Sandra OKA 374 replied the topic: XT exhaust centre section
When I fitted the 6bt I removed the muffler and the reduced section, it was engineered and regoed without a muffler but it was noisy especially when you were giving it a bit of throttle. Was actually emabarassing when you were just idling through a small town and had to give it a bit to climb a hill as while it sounded good it was loud under throttle.
So I fitted a straight through more of a resonator than a muffler which made it quite acceptable as it removed the "bark".

OKA 374 LT Van, converted to camper/motorhome,
400ah Lithiums, 1100w solar, diesel cooking heating and HWS,
Cummins 6BT, Allison 6 speed auto, Nissan transfer.
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05 Jul 2017 05:19 #12 by 210greg
210greg replied the topic: XT exhaust centre section
We took out the muffler in both 210 and 366 as part of the Swift upgrade. they are a little load when you put the boot in we think they are great.

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13 Oct 2018 15:41 #13 by packhorse
packhorse replied the topic: XT exhaust centre section
Did a run up Greenmount hill east of Perth today to get a speed reading at a couple of spots. Did another run after removing the air filter cover (new filters) but couldn't make out any difference, I will try that again on the open road though as it has to make a bit of difference. Went home and removed the muffler and tail pipe then went back down the hill. My marker was at a spot on the climb where, with the muffler she was working in 4th at 2000rpm to get 65km. without the muffler I had to back off for a while cos a Hilux held me up but went past the same marker in 4th doing 70kmp at 2200rpm, (I dont think the Hilux altered the test too much because where I happened to be) It was nice to hear that little turbo, seriously didnt think it was there before. I think I'll fill the muffler gap with pipe and fit the tail pipe back on and leave her at that. It didnt appear to be any noisier.

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