4jg2 exhaust

by **danz20** » Tue Jul 21, 2015 6:37 pm

hi there
looking at upgrading my exhaust
is it worth the extra hassle to change/fab a new bend right off the turbo or will I still get decent gains if I just renew it from the down pipe onwards

cheers

by **geeves** » Wed Jul 22, 2015 7:02 am

half your money and 10% of the gains are in that front pipe. If you want the ultimate do it but I wouldnt bother unless it has to be changed

by **Downhillnz** » Fri Jul 24, 2015 12:52 pm

geeves wrote:half your money and 10% of the gains are in that front pipe. If you want the ultimate do it but I wouldnt bother unless it has to be changed

I'm yet to understand why. The time to make a dump pipe vs making the rest of the exhaust is crazy.

It took me around an hour to have the dump pipe made. vs a whole day to make the rest of the exhaust.

by **geeves** » Fri Jul 24, 2015 1:35 pm

plus that flexi joint etc.
Exhaust shops increase prices on stuff they dont want to do

by **danz20** » Fri Jul 24, 2015 5:28 pm

Im planning to try keep it simple straight off dump pipe and along and out the side by rear wheel on swb so no door to worry about

by **SamMu93** » Fri Jul 24, 2015 8:05 pm

I have just recently upgraded the whole system in my Mu (4jb1-t) and the results take the sting out of the cost!
If you go down the same road as me it cost $1200 for the exhaust - excluding the dump pipe. Dump pipe came from Australia at around the $200 mark... I removed the old system also to save some time on labour.
With that done it gives a nice sound but no major increase in power- that comes later with extra boost and fuel!
Once its all said and done I personally think its worth it- Ive only got a max Egt of 400dg with 1full turn of the fuel screw
And it has a heap more power. So room for more yet.

by **danz20** » Sat Jul 25, 2015 9:00 pm

Mines efi so bot going to be avle.to.see huge gains without changing the pump at this stage

by **Downhillnz** » Wed Jul 29, 2015 8:34 am

danz20 wrote:Im planning to try keep it simple straight off dump pipe and along and out the side by rear wheel on swb so no door to worry about

I did this. Its loud. There isn't enough space to get a muffler or anything of decent size to quieten it down until you get to around there the rear wheel is.

^^Assuming you mean in front of the rear wheel not behind.

by **nb422** » Wed Jul 29, 2015 7:50 pm

Mines straight piped. Not too loud but drones on open road

by **danz20** » Tue Aug 11, 2015 4:14 pm

i will run a hot dog of some description to quieten it down and see how it goes just going over the diff will be a pain in the ass

by **isuzurob** » Tue Aug 11, 2015 6:41 pm

i have run 2 1/2 on my trucks with coby hot dogs and with straight pipe i put flanges in to try differnt mufflers, hotdogs just changed the tone wasnt any quieter though, rotary mufflers work well as they are high flow and still give abit of sound

by **Powertruck31T** » Wed Aug 26, 2015 4:34 pm

Just made a new downpipe for mine haven't got it going yet but looking forward to seeing the difference. I didn't realise the stock cast pipe is only 49mm just under 2".

by **geeves** » Sat Sep 05, 2015 7:57 am

When I get round to doing the exhaust on mine I might be giving you a ring for one of them

by **Powertruck31T** » Tue Sep 08, 2015 3:31 pm

Hi Geeves no worries I got 2 plates laser cut out to make it worth while. Got them made with 2 ports instead of one as it was easier to merge the 2 pipes than try and shape the pipe into the standard flange.
Truck was noticeably different with the new pipe just keeps pulling. I'm still yet to give it some more fuel as its clean as a whistle out the tail pipe and EGT's are only 500 deg C pre turbine under load. Based off how this goes at the moment compared to my 3.1 MU its definitely go a lot more punch and that thing had 420NM of torque. Will get it back on the dyno once I have some more k's on the engine and see what its got.

by **Dinger95** » Wed Sep 09, 2015 11:16 pm

Powertruck31T,
Are you using the stock gaskets or did you have something laser cut that isolates the two pipes at the turbo?
I have one of the BrokenMu 3" pipes and am still working out the gasket issue.

by **Powertruck31T** » Fri Sep 11, 2015 7:53 am

Hi Dinger95 I just used the standard outlet gasket. Although it should have a custom one made to seal off the wastegate port I didn't bother I figured the pipe flows so much better than a standard one I couldn't really see much gain to be had by sealing it off completely. You could try using a single layer gasket which will crush up a lot better and almost seal it.

by **stardog** » Fri Sep 11, 2015 6:00 pm

I just used the normal gasket on my 3" dump pipe I've had no problems so far on the mu with the full 3" exhaust system on it.

by **Dinger95** » Thu Sep 17, 2015 2:27 am

Thanks guys, if I do anything it might be something like the Grimm Speed down pipes and use the standard and cheap gasket.

by **mattmannz** » Fri Sep 18, 2015 3:54 am

Is anyone making these for sale? I am about to reshell my truck and would be interested.

Cheers
Matt

by **Gazza1904** » Wed Sep 23, 2015 3:47 pm

I'd be interested in purchasing one of them Powertruck31T if you decided to start producing them

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