Is there a Catalytic convertor on GU 4.2 Patrols?

Submitted: Thursday, Jan 10, 2008 at 13:56
ThreadID: 53302 Views:5699 Replies:11 FollowUps:21
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Maybe a dumb question, but I am happy to admit I don't know a lot about exhaust systems. I have had a 3" Exhaust (mandrel bent) fitted to my 4.2 GU with 'apprently' 3" dump pipe. To my untrained eye the exhasu still ooks restructed doing a sharp 90 degree downwards turn as it emerges from the Trubo.
According to the Dyno printout, I've achieved only a very small increase in torque/power. Admittedly I was expecting a lot more based on reports I have heard around the place (and extra 7KW at 3200RPM) not a lot of increase for the grand it cost me to have made and fitted.'
I have what appears to be a catalytic converter under the front passenger and to me this seems like another possible way to "open" up the 'breathing' If this is in fact a cat', can I 'open it up a bit'??????
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Reply By: Member - Coyote (QLD) - Thursday, Jan 10, 2008 at 13:57

Thursday, Jan 10, 2008 at 13:57
I soooo should use the spell checker before I post... but I think you get what I mean...
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Reply By: Member - Matthew C (WA) - Thursday, Jan 10, 2008 at 14:08

Thursday, Jan 10, 2008 at 14:08
Short answer is NO.

Dont worry about spelling we know what you mean.

MAtt
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Reply By: madcow - Thursday, Jan 10, 2008 at 14:22

Thursday, Jan 10, 2008 at 14:22
out of interest what were the dyno figures? I would like to compare with mine done by Denco diesel. The 90 deg bend is nothing to worry about and cannot be avoided. Is yours an intercooled model?
AnswerID: 280766

Follow Up By: Member - Coyote (QLD) - Thursday, Jan 10, 2008 at 14:40

Thursday, Jan 10, 2008 at 14:40
OK, I'll put the Dyno stats on here but from the little research I've done it seems there are a lot of variables to consider in the Dyno..

Pre 3" exhaust it peaks at 3200RPM - 98HP/160FtLb
post 3" Exhaust it peaks at 3400RPM at 108HP/160FtLb
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Follow Up By: madcow - Thursday, Jan 10, 2008 at 14:52

Thursday, Jan 10, 2008 at 14:52
109.6hp 321.7lb-ft 3" exhaust including dumpipe and had the timing corrected, Mine is an 03 intercooled. Next step would be to do turbo mods to acheive more. Or put it on LPG
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Follow Up By: Member - Coyote (QLD) - Thursday, Jan 10, 2008 at 14:58

Thursday, Jan 10, 2008 at 14:58
I forgot to mention, yes it's intercooled..
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Follow Up By: paulsra - Saturday, Feb 02, 2008 at 20:37

Saturday, Feb 02, 2008 at 20:37
i would have to agree, turbo mods are the way to go, up the boost, (slowly, slowly).

another easy boost for power is a performance air filter.
that can make a huge difference , especially if youve modded the exhaust for better flow.








Paul
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Reply By: Member - Matthew C (WA) - Thursday, Jan 10, 2008 at 14:28

Thursday, Jan 10, 2008 at 14:28
There is no real gain in replacing the exhaust only on the TD42T, the restriction is in the turbine housing.

We do a modded turbo with exhaust fitted for the TD42T for $2750 with 3" exhaust that yields around 20Kw and 40Nm with lower EGT's and low engine temps when towing.

MAtt
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Reply By: ddr - Thursday, Jan 10, 2008 at 14:35

Thursday, Jan 10, 2008 at 14:35
Did you get the timing/tuning done also? Everything ive read states that to get any real gains you need to get both the exhaust & timing done.
AnswerID: 280773

Follow Up By: Member - Coyote (QLD) - Thursday, Jan 10, 2008 at 15:07

Thursday, Jan 10, 2008 at 15:07
To be honest I don't know.. I must confess to not being involved in the process due to being out of the country at the time and now I am playing catch up trying to work out what was actually done. My recipet from MTW in Adelaide shows "supply and fit 3" exhaust" I have talked to them and they say, "yeah a re-tune was probably done, but can't say for sure" and MTQ in Brissy don't have a DYNO and I really don't want to drive out to Towoomba if I can help it..
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Reply By: Member - Matthew ,United Fuel- Thursday, Jan 10, 2008 at 16:38

Thursday, Jan 10, 2008 at 16:38
Ok

(1)Was the DUMP pipe changed, can you tell if it has been changed.

(2) Has the fuel screw cap been taken off???

(3) What brand of exhaust was fitted or was it a custom job??.

(4) Is the heat sheild still covering the dump pipe ??.

Matt
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Follow Up By: Member - Coyote (QLD) - Thursday, Jan 10, 2008 at 17:06

Thursday, Jan 10, 2008 at 17:06
(1) I don't know for sure but itlooks likeit has as it appears to be of the same style and material of manufacture as the rest of the exhaust.

(2) I don't know what fuel cap you are talking about - (showing my ignorance no or what)

(3) It is an MTQ Exhaust, supplied and fitted by MTQ in ADL.

(4) yes the heat shield is still there which makes me think it is original...
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Follow Up By: Member - Coyote (QLD) - Thursday, Jan 10, 2008 at 17:06

Thursday, Jan 10, 2008 at 17:06
(1) I don't know for sure but itlooks likeit has as it appears to be of the same style and material of manufacture as the rest of the exhaust.

(2) I don't know what fuel cap you are talking about - (showing my ignorance no or what)

(3) It is an MTQ Exhaust, supplied and fitted by MTQ in ADL.

(4) yes the heat shield is still there which makes me think it is original...
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Reply By: Sand Man (SA) - Thursday, Jan 10, 2008 at 16:41

Thursday, Jan 10, 2008 at 16:41
Coyote,

Catalytic Converters are only required on unleaded petrol engined vehicles and has been compulsory on all ULP vehicles for many years.

The catalytic converter turns gases such as carbon monoxide, hydrocarbons and nitrogen oxides into non-toxic emissions such as carbon dioxide and water vapour.

So you are basically turning a poison (carbon monoxide) into a ozone layer depleting substance. (carbon dioxide)

Can't win can we.



Bill


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AnswerID: 280791

Follow Up By: Member - Coyote (QLD) - Thursday, Jan 10, 2008 at 17:12

Thursday, Jan 10, 2008 at 17:12
Thanks Sand man.. I undertsand their role and that they are compulsory on ULP vehicles, but I am pretty sure that they are also fitted to diesels. Having said that I am open to being corrected. I guess it comes down to the point that if it is not REQUIRED on a diesel, and there are efficiencies to be had in performance by removing or 9broom sticking) them, then perhaps it could be done legally, unlike in an ULP vehilce where it would be illegal for you to "broom stick" your catalytic converter.

So I guess in summary does that meant:

1. There are NO catalytic converters on diesels? OR
2. there MAY be but they are not REQUIRED?

If NOT "Required" does anyopne have any evidence to show that removing them or 'broomsticking' them improves performance? I am aware that ina few US vehciles there is a sensor post converter that detects the O2 levles etc and if your brromstick the converter this 'sensor' automatically adjust the fuel/air mixture in an attmept to 'clean' your emmisions which in turn 'stuffs' any improvments you may have gained by opening the exhaust line...
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Follow Up By: Member - Luke (SA) - Thursday, Jan 10, 2008 at 17:29

Thursday, Jan 10, 2008 at 17:29
Sorry to dissapoint you Sandman but......

The ZD30 in the Patrols have a catalytic converter. I'm not sure on the 4.2's though.

Cheers Luke
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Follow Up By: SteveL - Thursday, Jan 10, 2008 at 23:35

Thursday, Jan 10, 2008 at 23:35
CFC's (ChloroFluroCarbons) are ozone depleting,Carbon dioxide is a Greenhouse gas.
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Reply By: trolute - Thursday, Jan 10, 2008 at 17:44

Thursday, Jan 10, 2008 at 17:44
Yo,

I bought an MTQ dump pipe and 3" exhaust for my 03 GU 4.2 TD intercooled ute, and fitted myself. The dump pipe does not look a lot different, and indeed the heat guard fits back on again, so if i had not done it myself, i wouldn't have known it was different.

After the dump pipe, the system has a small section of flexible pipe (looks like a braided brake line on a bike) just next to the gearbox, then it has a very large muffler which sits just in front of the rear axle. the muffler is a straight thru 'hotdog' style, and therefore virtually totally non-restrictive (aka like a aftermarket dirtbike muffler). i got to peer down it to check it was a straight thru job, as i fitted it all myself.

now, the power. No dyno for me, but IMHO, there has been no increase in power, and no change to fuel economy. The only real difference is that it has a slightly more beefy sound. overall, it was a waste of money, but hey, you got to try these things. I agree with others, if you got the pump tuned to suit, then you will get power, but will loose economy (and our engines are thirsty as it is). that said, you would want to get a good tuner to do it, most average mechanics would just turn the screw up a few turns...

trolute
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Follow Up By: Member - Coyote (QLD) - Friday, Jan 11, 2008 at 12:18

Friday, Jan 11, 2008 at 12:18
G'Day trolute, mate thats great info. Thanks so much for taking the time to fill me in.. sounds like yours is same as mine and bummer re the extra power hey... the additional power thing is always a trade off.. in theory if you have extra pwer you should havebetter fuel economy, but we all know that wi alittle bit more power we just put the foot down a little harder and hence no improvment in fuel economy hehehe.. Cheers
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Reply By: Member - John - Thursday, Jan 10, 2008 at 18:22

Thursday, Jan 10, 2008 at 18:22
Coyote, I had an MTQ modded turbo fitted about three years ago, was ok, until I drove from Vic to Towoomba and had it tuned by MTQ, half an hour and it was transformed, so well worth the drive. Driving up next week to have my new wagon done. Impressed, yes, very. John
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Reply By: Peter McG (Member, Melbourne) - Thursday, Jan 10, 2008 at 21:55

Thursday, Jan 10, 2008 at 21:55
Had the beaudesert 3" system installed and it made a huge difference. Must be in the tuning.

Peter
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Follow Up By: Member - Matthew ,United Fuel- Friday, Jan 11, 2008 at 00:00

Friday, Jan 11, 2008 at 00:00
Its all in the tuning BUT without the exhaust and in our opinion the modded turbo there is too much restriction in the exhaust housing of the turbo and dump pipe to squeze too much out of them,hence they WILL get hot if pushed too far on an unmodified turbo/dump exhaust .

Matt
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Follow Up By: Member - Coyote (QLD) - Friday, Jan 11, 2008 at 14:27

Friday, Jan 11, 2008 at 14:27
Hey Peter, a bit OT form this thread but just wondering.. the steel rims you are running.. are they 17"? If so, your the only other GU I've seen with them.. I found a set but I think I'd have found hens teeth a lot easier..
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Follow Up By: Peter McG (Member, Melbourne) - Friday, Jan 11, 2008 at 14:50

Friday, Jan 11, 2008 at 14:50
Sorry, no I use standard 16x8 ROH rims so I can use 16" tyres which are cheaper and more readily available away from main centres.
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Follow Up By: Trevor R (QLD) - Friday, Jan 11, 2008 at 21:30

Friday, Jan 11, 2008 at 21:30
Matthew,

Even with the modded turbo, big xhaust/dump pipe combo, when pushed these things will still get hot. Trust me I know first hand. I have spent plenty trying to solve it but a lighter right foot is the only solution I can muster up.

Cheers, Trevor.
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Follow Up By: Member - Ed. C. (QLD) - Friday, Jan 11, 2008 at 22:39

Friday, Jan 11, 2008 at 22:39
>> "when pushed these things will still get hot" <<

Mine doesn't :))

And yes, I've towed a c/t (and loads of firewood) up the Toowoomba range plenty of times during the summer months, and have towed into a ferocious headwind between Roma & Charleville in 43deg. ambient temps....

To be sure, the gauge needle moves higher in such conditions (and I keep a close eye on it when it does this), but it's never gone into the danger zone, and I have never observed symptoms of overheating (such as coolant loss), therefore, IMO it does not "get hot" per se....(YMMV;-))
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Follow Up By: Member - Matthew ,United Fuel- Friday, Jan 11, 2008 at 23:04

Friday, Jan 11, 2008 at 23:04
Unfortunatly some do suffer from heating issues no matter what you do to them same as the aftermarket turboed 1HZ's ,but most of the time the mod seems to help the problem a lot.

Matt
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Reply By: Member - Coyote (QLD) - Friday, Jan 11, 2008 at 12:23

Friday, Jan 11, 2008 at 12:23
Thanks all for the great feedback.. it really sounds like I'll need to get some tuning done.. maybe go for a day trip out to Toowoomba.
I am pretty confident that my system includes the dump pipe, but I am also pretty sure I have a Cat' in the system too, so between opening up the Cat' and gettig a tune up done, I might be able to have a pretty significant improvment from all reports. Cheers all.
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Follow Up By: Member - Matthew ,United Fuel- Friday, Jan 11, 2008 at 13:28

Friday, Jan 11, 2008 at 13:28
I would be very surprised if there was a CAT in the system but stranger things have happened.

Good luck with it.

Matt
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Follow Up By: Member - Ed. C. (QLD) - Friday, Jan 11, 2008 at 14:16

Friday, Jan 11, 2008 at 14:16
Coyote,
If you do go for a run up to Toowoomba, then since you'll be in the vicinity anyway, may I respectfully suggest that you have a chat to Peter McGrath at Toowoomba Superior Turbos ..
(4634 6565) 549 Boundary Street, literally a stone's throw (round the corner) from MTQ...
He did the turbo upgrade on my GU, and fitted the aftermarket turbo to my previous vehicle (GQ), and if/when I need any more work done on turbos, I'll be seeing him again....

And, while you're waiting for whatever it is that gets done (by whoever), give us a buzz, and I'll make ya a cuppa;-)))

Regards,
Ed C
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Follow Up By: Member - Coyote (QLD) - Friday, Jan 11, 2008 at 14:25

Friday, Jan 11, 2008 at 14:25
Thanks very kindly for the tips and offer for a brew.. It will probably be a few weeks before I get a chance to head up that way but if/when I do I will MM you. I'd be keen to check out how those aftermarket seats of yours work out too...
Cheers
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Follow Up By: Member - Ed. C. (QLD) - Sunday, Jan 13, 2008 at 02:42

Sunday, Jan 13, 2008 at 02:42
You're welcome;-))

Bit of trivia for ya.. Dunno if ya knew this (or if it makes any difference), but MTQ Engine Systems (Aust) Pty Ltd is a wholly owned subsidiary of MTQ Corporation Limited based in Singapore (and listed on the Singapore Stock Exchange)..

In a nutshell, any profit they make, goes offshore:((

That's one reason why I recommend the "local bloke" (apart from the fact that he knows what he's doin';-))

Catch ya later....

Ed C

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