Anyone put an aftermarket exhaust on a 3.0L GU Patrol?

Submitted: Thursday, Dec 02, 2004 at 19:30

ThreadID: 18281 Views:8250 Replies:5 FollowUps:10

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Member - Andrew(WA)

Just wondering what changes (if any) you have experienced with any after market exhausts on the mighty 3.0l GU.

What size?

What benefits?

What negatives?

Thanks in advance.

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Reply By: pjd - Thursday, Dec 02, 2004 at 19:54

Thursday, Dec 02, 2004 at 19:54

i have a 3 inch mandrel bend on a 4.2 patrol & it made a big power gain well worth the dollars

AnswerID: 87029

Follow Up By: Pilbara Wayne - Thursday, Dec 02, 2004 at 20:09

Thursday, Dec 02, 2004 at 20:09

PJD

Did you just put on the 3 inch and do nothing else? Is it connected to the original dump pipe?

Seems to be quite a bit of discussion on this topic with several members doing simple mods like yours, right through to new turbo impellors and housings, new dump pipes, increased boost etc.

I'd like to improve the power of my 4.2TD and dont mind spending the money, as long as it works.

Cheers

Wayne

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Follow Up By: pjd - Thursday, Dec 02, 2004 at 20:29

Thursday, Dec 02, 2004 at 20:29

wayne call MTQ formerly known as DTS [dynamic turbo systems] & they do a kit. new[bigger] fan in the turbo bore out the housing an intercooler if you dont allready have one it frees up the air flow & with a big bore exhaust makes a huge difference

FollowupID: 345720

Reply By: GO_OFFROAD - Thursday, Dec 02, 2004 at 20:08

Thursday, Dec 02, 2004 at 20:08

John Rowlandson put a 3" exhaust, and a dtronic on his pootrol, and noticed a performance benifit, and it was then almost as quick as his Bro's 3.0 td 120 series prado from the lights.....

AnswerID: 87030

Follow Up By: Member - Maurice F (WA) - Thursday, Dec 02, 2004 at 21:25

Thursday, Dec 02, 2004 at 21:25

I have GU 4.2tdi fitted a 3" Mandrel bent exhaust not alot of benifit, 2 weeks later drop pipe arrived a different kettle of fish then , when you c the origional cast dump pipe u can c where the prob lies, restricted to buggery (blank off ur EGR Valve as well claggs up ur inlet manifold) maurie

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Reply By: Rosco - Bris. - Thursday, Dec 02, 2004 at 23:12

Thursday, Dec 02, 2004 at 23:12

It is my understanding that the pipes should be mandrel bent, however any increase in diameter over that of the turbo outlet is wasted.

As usual I may well be wrong ........... quite often am ........ just ask herself.

Cheers

AnswerID: 87071

Reply By: Member -Dodger - Friday, Dec 03, 2004 at 08:04

Friday, Dec 03, 2004 at 08:04

Motsons of Brisbane did my 4.2 patrol at stage 2 IE. mandrel bent exhaust pump and turbo opened up & the increase was 162nm, plus 18kw. This at the wheels on dyno. Made a big difference in driving and towing.
The 3ltr can be tickled even better upgrade chip (ditronics or similar) turbo worked and mandrel bent exhaust. There are many people in each city that can do this do a google search and find them.
Carefull if you have a auto the box might not like it.

I used to have a handle on life, but it broke.

Cheers Dodg.

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AnswerID: 87091

Follow Up By: GO_OFFROAD - Friday, Dec 03, 2004 at 10:11

Friday, Dec 03, 2004 at 10:11

side note;-
dtronic or similar?,
though there is other things on the market, that make more grunt, none are similar to the dtronic, as the dtronic adjusts timing, as well as fuel, where as any other brand currently is no different to winding up the fuel screw on an old style pump...

Dtronic also changes what the ecu see's from the engine, and can actually help save your engine if water temp goes high [ monitoring combustion temps as water temp changes very quickly] by pulling fuel back beyond factory settings if required, by changing what the ecu see's.

Most other types change what the engine see's from the ecu, so it just keeps adding more fuel to try and make more grunt regardless of what the ecu is seeing, bit like winding up the fuel screw on the older type pumps....

FollowupID: 345778

Reply By: hoffy - Friday, Dec 03, 2004 at 10:57

Friday, Dec 03, 2004 at 10:57

Andrew
I recently upgraded the complete system on my 3.0l auto. I bought a kit from Beaudesert Exhaust Centre in S E Qld. It is a 2 3/4 in. mandrel bend setup from the turbo right through. They increase the size of the catalytic converter and use a free flow muffler and eliminate the small resonater behind the rear axle. Took me about two hours to remove the old system and fit the new one.

The benefits : Motor runs more freely, pulls better on hills, turbo spools up at lower revs. Marginal improvement in fuel consumption. At highway speed it hardly seems to be working at all

Negatives: None that I can see. exhaust noise is no different to the standard system.

I also have a Dtronic fitted which made a big improvement, and the larger exhaust is the icing on the cake.
I also fitted a pyro at the same time to monitor exhaust temps.

AnswerID: 87118

Follow Up By: Member - Andrew(WA) - Friday, Dec 03, 2004 at 11:38

Friday, Dec 03, 2004 at 11:38

Thanks hoffy

that's the type of answer I was looking for.

cheers

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Follow Up By: Member - Captain (WA) - Friday, Dec 03, 2004 at 11:39

Friday, Dec 03, 2004 at 11:39

Hi Hoffy,

I am interested in your setup. I already have the Dtronic and am happy with overall power, but would still like more bottom end power.
How did the exhaust repalcement affect the bottom end power?
If it took 2 hours to fit, assume no major problems or other difficulties doing the job yourself?
What was the cost to buy (not fitted)?
Is the pyro fitting standard on the system, or do you have to order it as an extra?
Now that you have done the change, would you recommend it or is it not worth the expense in your opinion?

Thanks for any answers

Cheers

Captain

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Follow Up By: hoffy - Friday, Dec 03, 2004 at 15:39

Friday, Dec 03, 2004 at 15:39

Captain
Well worth the cost especially if you do any serious towing. From memory the new system was around $850. The fitting was a breeze- everything supplied and bent perfectly - looks just like the original only bigger.

The pyro was not included. I asked Beaudesert Exhaust to weld a fitting into the new pipe and then fitted a pyro supplied by Ian from Thermoguard. This is a very sensitive unit and I am amazed how quickly the exhaust temps change with increased or decreased accleration.
Very handy when towing.
Hope this helps.

Cheers.

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Follow Up By: hoffy - Friday, Dec 03, 2004 at 15:43

Friday, Dec 03, 2004 at 15:43

Sorry, I forgot to mention that bottom end power is better although if yours is a manual I think you would notice a much better response. The auto tends to mask the bottom end lag pretty well.
Cheers.

FollowupID: 345878

Follow Up By: Member - Andrew(WA) - Friday, Dec 03, 2004 at 16:50

Friday, Dec 03, 2004 at 16:50

Hoffy

I forgot to ask...is your car still in warranty? Any issues re warranty with the modification?

cheers

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Follow Up By: hoffy - Friday, Dec 03, 2004 at 17:47

Friday, Dec 03, 2004 at 17:47

Andrew
I am Just out of warranty so it would not be an issue with me. As I understand it Nissan would have to prove that the modification was the cause of any problem that might arise.
Cheers.

FollowupID: 345903