3" exhaust and turbo whistle

Submitted: Friday, Feb 15, 2008 at 08:49
ThreadID: 54590 Views:3456 Replies:12 FollowUps:7
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Morning Forumites,

Just had a 3" Beaudesert exhaust system fitted to the Patrol TD6 and very happy with instant power / torque results (don't mind the very slight 'rumble' from the back end either!).

One thing I have noticed since is that you can now hear the turbo whistle, whereas in the 3.5 years since I purchased the TD6, there has been no such noise noticeable at all.

Left me wondering whether the thing was working with the original Nissan system; or is perhaps that the new system (being of vastly different construction) magnifies the turbo machinations?

I expect fuel consumption to lag for a few weeks, while I play with the thing some.

Life is good.

Regards,
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Reply By: guzzi - Friday, Feb 15, 2008 at 09:38

Friday, Feb 15, 2008 at 09:38
Probably a combination of much larger pipe, different less restrictive mufflers and the fact the turbo now spools up a bit (lot) quicker.

enjoy
AnswerID: 287583

Reply By: DIO - Friday, Feb 15, 2008 at 09:45

Friday, Feb 15, 2008 at 09:45
'Boy-Racers' will tell you that all you need now is a 'blow-off' valve on the turbo and you'll have a real cacophony of noises. Could almost make music while you drive. Might get a bit annoying though.
AnswerID: 287586

Follow Up By: Truckster (Vic) - Friday, Feb 15, 2008 at 10:08

Friday, Feb 15, 2008 at 10:08
You cant run a blow off valve on a diesel.
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Follow Up By: Leroy - Monday, Feb 18, 2008 at 20:57

Monday, Feb 18, 2008 at 20:57
why?

Leroy
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Reply By: Member - Doug T (FNQ) - Friday, Feb 15, 2008 at 09:49

Friday, Feb 15, 2008 at 09:49
Len
Should sound Mickey Mouse now, I have Extractors on ny Troopy but have yet to fit the back 3/4 of the system with 2½ inch pipe, that's a gunnado project,
I still remember the sound effect from the 1977 Nissan UD CK40 ,It was put on the Dyno at Wagga and prucing 240bhp at the wheels from a 250bhp motor, with the hollow muffler it would sound like a Mortar shell passing over at every gear change...lol, I have heard some of the older Scania's do it too.

.
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AnswerID: 287587

Follow Up By: rockpiglet - Friday, Feb 15, 2008 at 19:03

Friday, Feb 15, 2008 at 19:03
My old 12lt Scania would back off a beaut, its the back pressure from the intercooler. If it didn't whistle back then you new you had done an intercooler hose.
The boys at beaudesert have one of the best pipe bending machines in the world on their floor. Got em to do up a 6inch stainless straight stack for my 9ltr.While I was at it I took 110mm off my muffler and ran 500mm straight pipe internal, the horse pwr difference in the midrange is very suprising.
Not as much back pressure on the DAF coolers but then they first invented intercoolers.
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Reply By: Trevor R (QLD) - Friday, Feb 15, 2008 at 09:53

Friday, Feb 15, 2008 at 09:53
Hi Len,

Turbo whistle on my GU is one of the most enjoyable sounds to my ears, I just love it.

Now just got to screw the boost up, increase fuel, fit guage after guage and you'll be set hehehehhehe.

PS my fuel consumption has never come back, even after 7 yrs. Just having too much fun all the time now LOL!!!.

Enjoy, Trevor.
AnswerID: 287588

Reply By: Truckster (Vic) - Friday, Feb 15, 2008 at 10:09

Friday, Feb 15, 2008 at 10:09
Running a muffler or not? I am currently, but will remove it in the next few weeks and redyno it to see if it makes a difference.
AnswerID: 287592

Follow Up By: Nick R (VIC) - Monday, Feb 18, 2008 at 16:49

Monday, Feb 18, 2008 at 16:49
just gone 3 inch on mine, interested in what improvement you get, apparently moggs got quite a bit, with a tune up that was.......
Beaudesert reckon there is no difference without the muffler, would sound better tho!!!
Nick
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FollowupID: 553427

Reply By: Member - Len H (QLD) - Friday, Feb 15, 2008 at 10:33

Friday, Feb 15, 2008 at 10:33
Hello all,

Yes, running muffler and I'll leave it that way to ensure my beloved does not wake up to the fact that I have been neglecting to obtain permission before the fact!

Why did I not do this yonk ago? I have heard many $WD's before that have had exhaust work done, and most sound like the approach of Armageddon; this thing sounds beautiful. I may take the long way home s'arvo!

Well worth it; the additional power and drivability makes it a different beastie altogether and as much (almost) fun to punt along as my TR6.

Regards...Len
AnswerID: 287596

Reply By: Wizard1 - Friday, Feb 15, 2008 at 10:42

Friday, Feb 15, 2008 at 10:42
Yes it really is a distinctive and attention seeking sound.

The freeing up of the exhaust flow is allowing the turbo to "spool" up at lower revs hence why you can now hear it. With a standard exhaust you would have found the turbo coming i at higher revs and your engne noise would have drowned it out.

Had a 2 3/4 Beaudesert system fitted to my Prado TD and had several other owners ask why it makes that noise especially at low speed.

One of my suggestions to a mate with a 3.0 GUII was to get down there and get one of their systems as he tows a 3 tonne van.
AnswerID: 287597

Reply By: Member - Howard T (QLD) - Friday, Feb 15, 2008 at 11:06

Friday, Feb 15, 2008 at 11:06
Hi Len

I have read your thread and replies with interest. I recently put extractors on my series 80 and queried the fitting of a 3" exhaust. The bloke in the muffler shop told me he would do it but it was illegal in Queensland and 2" was the maximum and that it could negate my insurance if I had a claim.
Obviously this advice was incorrect?
Would be interested in hearing the thoughts/advice of other members.

Howard.
AnswerID: 287600

Follow Up By: Trevor R (QLD) - Friday, Feb 15, 2008 at 16:14

Friday, Feb 15, 2008 at 16:14
Mine was done pre delivery on my brand new vehicle so I imagine if it was illegal, Nissan would have bucked at the suggestion of getting it done. Only my thoughts and I may stand corrected if anyone has the facts.

All modification work receipts have been shown to insurance co. as well with no recourse from them either, but I have'nt had to claim yet either hehehehe.

Cheers, trevor.
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Reply By: Member - Matthew ,United Fuel- Friday, Feb 15, 2008 at 12:23

Friday, Feb 15, 2008 at 12:23
A lot of the related extra noise is due to the old cast iron dump pipe being removed and the new thinner steel one being fitted that doesn't soften the sounds of the turbo working.

We get customers that complain about that noise for some reason and have to lag the dump pipe to quieten them down.

Personally i love it and you can definately hear vthem working afterwards.

Matt
AnswerID: 287613

Reply By: Member - Len H (QLD) - Friday, Feb 15, 2008 at 12:38

Friday, Feb 15, 2008 at 12:38
Thanks Matt; interesting info. I will leave the dump (ain't that a nice word) pipe as it is now. It surely is a lot larger piece of dump pipe than it was previously!

I may take a drive at lunch time with all the windows open; just to hear the dump pipe dump!

Regards.......Len
AnswerID: 287616

Follow Up By: Member - Matthew ,United Fuel- Friday, Feb 15, 2008 at 13:39

Friday, Feb 15, 2008 at 13:39
If you cant hear it ,it ain't working properly in my opinion .

Matt
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Follow Up By: TD100 - Friday, Feb 15, 2008 at 19:06

Friday, Feb 15, 2008 at 19:06
Len,

it will change tune after a while,the insulation is in a plastic bag when manufactured and it will melt after some time in the mufflers,plus carbon build up will also change it.mine has quietened down a lot since it was first installed(3.5yrs)cheers Paul
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FollowupID: 552920

Reply By: rumpig - Friday, Feb 15, 2008 at 19:20

Friday, Feb 15, 2008 at 19:20
my 105 series cruiser did exactly the same thing after installing a beaudesert exhaust 3" system, the whistle is heaps more noticable. the first week my fuel economy was pretty ordinary, but i had just added an intercooler to the turbo aswell, so you have to try out the extra power available. i've found that out on the open highway i get heaps better fuel economy with the turbo, intercooler and 3' system then when it was just a standard 1HZ. i get another 100klms - 150klms out of both tanks of fuel, so i'm happy about that.
AnswerID: 287671

Reply By: Richard W (NSW) - Friday, Feb 15, 2008 at 23:03

Friday, Feb 15, 2008 at 23:03
Len,

My 100 series TD had a bit of a whistle when the turbo spooled up with the standard exhaust. The whistle got louder when I put on a 3" mandrel bent system.
AnswerID: 287706

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