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TDI 4.2 3" Exhaust upgrade

Submitted: Monday, Nov 01, 2004 at 22:54

crayman

Chris
Some 2 weeks ago i had a 3" Mandrel bent exhaust system fitted to my Nissan Patrol sadly without any noticable difference, however i have just fitted a 3" drop pipe which has made all the difference power comes on at lower revs and i can here the turbo spin up, very happy , blanking off EGR vlve 2 morrow mainly to stop soot in inlet manifold
Maurie
ThreadID: 17492 Replies: 4
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AnswerID: 82673   Submitted: Tuesday, Nov 02, 2004 at 00:12

Boeing replied:

Maurie, Is the drop pipe the extension that you can get added from the wastegate of the turbo?
May be a silly question but I am not sure on what a drop pipe is.

Regards

Mark
Reply 1 of 4
AnswerID: 82697   Submitted: Tuesday, Nov 02, 2004 at 08:30

sean replied:

Maurie

any chance of some dyno figures????. That would really help us other 4.2 owners to see what effect the various mods have.

Sean
Reply 2 of 4
FollowupID: 341784   Submitted: Tuesday, Nov 02, 2004 at 13:12

Old Johno [NSW] posted:

sean,

I recently had the 3" upgrade with the turbo dump pipe & the throughflow muffler. "Motsons" QLD did the job and the Dyno results they gave me showed a 20% increase in torque & 25% Increase in KW at the rear wheels.
I towed a caravan to QLD with the old 2" pipe & after the 3" was fitted you could notice the real difference when hauling hard, it seemed to hang on much better with no noticable effect on the temperature
Have a Good one
FollowUp 1 of 2
FollowupID: 341834   Submitted: Tuesday, Nov 02, 2004 at 20:35

sevo posted:

Gday sean,
iam fitting turbo outlet soon will dyno and post results.
Sevo
FollowUp 2 of 2
AnswerID: 82702   Submitted: Tuesday, Nov 02, 2004 at 08:55

Member - Chris M (QLD) replied:

Gday Maurie,

So you did find the 3" dump very noticeable? Think blanking of E.G.R is something that needs to be done sooner rather than later!

My turbo spools up very quickly; at the moment around 900rpm. Turbo spool is very loud, enough to make rice boys in there doof doof cars look over to see what the fuss is...

I'd be interested mainly to find out if the dump pipe standard acts as a bit of a restriction and heat builds up there giving me a false reading on the pyro...

My main concern is something that was raised some months ago prior to the powerup on mine. If the turbo is given enough leway to spin up quickly, will the boost actuator (or whatever it's called) pick up too much boost too quickly and restrict it? At the moment, mine spools so quickly, without any probs. I just want to reduce E.G.T's even further...

What muffler did you put on and was it only one or did you still run two?

Thanks for the update mate...look forward to seeing your dyno report.

Cheers

chris.
Reply 3 of 4
FollowupID: 341754   Submitted: Tuesday, Nov 02, 2004 at 10:17

crayman posted:

Morning all
Firstly Mark The dump pipe replaces the origional cast restictive elbow that bolts onto the outlet of turbo then onto exhaust pipe (about 200mil long) Chris only center muffler used( FullFlow) my son races turbo RX4 mazda very knowlageable on engine tuning ,says must have as free flow unresticted exhaust as possible for turbo (Rotary turbo engines run extremely hot exhaust temperatures not had any turbo probs with his car on Garrett TO4e turbo 16lb boost 346 hp 8000rpm @ rear wheels dyno) unfotunlatly im not close to dyno to do tests
Maurie
FollowUp 1 of 4
FollowupID: 341764   Submitted: Tuesday, Nov 02, 2004 at 11:23

Truckster (Vic) posted:

Muffler?? Whats this muffler you speak of?
FollowUp 2 of 4
FollowupID: 341765   Submitted: Tuesday, Nov 02, 2004 at 11:24

Member - Chris M (QLD) posted:

Thanks Maurie!

I have a highflow single muffler setup as well. 346hp at the rears is impressive...I'm hoping to get my measily 155hp to around 180 once the motor/turbo have worn in with intercooler upgrade and dump pipe change over. Never going to run more than 12psi. Am happy now with the performance and really just drive it like a petrol now.

Still getting an average of 8.47 k's/L. Won't know of towing until this weekend. Heading out to Sandy Creek 4wd/camping park so I'll have a better idea next week. Will set Gps up to get correct k's etc.

Obviously you must be getting more happy with each mod that you do?

Chris.
FollowUp 3 of 4
FollowupID: 341767   Submitted: Tuesday, Nov 02, 2004 at 11:26

Member - Chris M (QLD) posted:

The muffler is for those that perfer to drive in peace as opposed to the drone of a small aircraft Truckster! ;-)
FollowUp 4 of 4
AnswerID: 82807   Submitted: Tuesday, Nov 02, 2004 at 21:26

Member - DOZER replied:

Hi
The larger exhaust will spool the turbo up faster and with less restriction, but turbo will still unload boost at preset, just will do this earlier in rev range...run a intercooler and use 14 psi as per Safari setup :-0
andrew

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