Living with a de-catted and de mufflered TDCi

[PAT303]

It's been a while since I removed the cat from Tracey's defender so decided to comment on the results.Since buying it the best things I've done to it is fit Mulgo seat rails,axle flanges,a heap of sound deadening on the outside and thick fabric mats covered with rubber mats inside and the decat pipe and center muffler removal.I've been driving it around Perth this last week and it's been hot,mid 30's and the difference is major,when we were living in the Pilbara the heat up through the floor was a a killer,you could cook eggs on the floor above the muffler and a roast dinner in the foot wells but now after a good run up through the Perth hills area the floor temps are cooler.Originally the engine ran well but now runs better,it doesn't have more power but winds up quicker,it accelerates faster and uses less fuel doing it,normally the light comes on around 500-520k's but now it's around 560 or last night it was 580,the furthest it's ever gone,all up removing both the muffler and cat has been a good thing,no over boosting or blown turbo's,no half cooked kids in the back and broiled wife in the front,better performance and less fuel used,happy happy. Pat

[Beery]

Much extra noise with the centre muffler out?

[Toxic_Avenger]

This thread is useless without getting a video of the in-cab noise and a few high speed drive-bys...
:D

[YOLO110]

Here you go!

https://www.youtube.com/watch?v=s24F5Qmehj8

;)

[PAT303]

Much extra noise with the centre muffler out?

A bit more yes but not enough to worry about. Pat

[LoveB]

is this a 2.2 or 2.4?

[jackdef90]

My 2.4 is decatted, the noise when you do a quick hard revving change from 2nd to 3rd peeeeewwww!!!! its pretty cool.
have not done the muffler yet.

[PAT303]

is this a 2.2 or 2.4?

2.4,and it's easy to do,I bought the pipe from Cradocks for $120 posted and it took all of an hour or so to replace,it's worth every cent.Now all I need is a drivers side window because yesterday while parked at the beach someone decided they needed my wallet more than I do :mad:. Pat

[Beery]

I think the whole supposed danger of overspeeding the turbo is rubbish. The ECU controls the turbine vane position to produce the required boost.

[AlecW]

2.4,and it's easy to do,I bought the pipe from Cradocks for $120 posted and it took all of an hour or so to replace,it's worth every cent.Now all I need is a drivers side window because yesterday while parked at the beach someone decided they needed my wallet more than I do :mad:. Pat

That down right sucks Pat, I'm sorry to hear that:(

[LoveB]

I was advised not to do it on my 2.2 Dont know why. I would not mind doing it though.

actually it was something to do with the overboosting

[DoubleChevron]

If your trying to stop heat transfer, I'd suggest trying several layers of this stuff.

EZ Cool Automotive Insulation heat barrier and noise reduction for cars, trucks, classic cars, street rods and much more (http://www.lobucrod.com/)

Not super cheap like it used to be ( due to the exchange rate). I fitted it to my Citroen CX quite a few back as they too suffer staggering heat transfer through the floors and did a writeup to it (that the seller has linked).

citroen cx insulation (http://www.shanescitshed.com/cx2500/air-con/citroen_cx_insulation.html)

seeya,
Shane L.

[jackdef90]

Catalytic converters are useless unless you care about pollution from your car.
Your engine will run a lot better without it. Lower egt, gets rid of turbo lag and you'll get rid of the red hot ball of steel wool sitting in your exhaust pipe turning your glove box into an oven.

[1nando]

Ive been banging on about this for a long time. Apparently both BAS and Alive tuning think different.......ive been told to keep some back pressure is the exhaust...even though the whole back pressure in diesel myth has been disproved.

My 2.2 is remaped, intercooled and decated and Centre muffler will be removed tomorrow :cool:

[jackdef90]

Maybe its something to do a vgt turbo having vanes that adjust, I could imagine the quicker spool up could wear them out quicker, this could be completely wrong of course, I have no prior experience with these turbos.
I've had other turbo diesels and I've put bigger size exhausts and dump pipes on all of them, they've all run heaps better.

[jackdef90]

Thinking about it, vgt turbos don't have a waste gate so, over boosting you would run the risk of damage.

[1nando]

The actuator is controlled by the ecu.....someone correct me if im wrong.

If thats the case how can you overspool? The actuator controls boost pressure/psi.

Someone tech saavy please confirm whether this is or isnt correct...

[PAT303]

I run a boost gauge and it goes up to 18psi if I really boot it before dropping to 16,eggzackly like it did with the cat and muffler fitted.It's done 560km's and the light still hasn't come on,it NEVER did those K's with all the crap hanging off it and better yet,from an hour ago it's got a brand new drivers window. Pat

[1nando]

Thanks for the info Pat, appreciate it. As usual you are full of great info:thumbup:

Do you run an egt gauage?

[PAT303]

Not on the TDCi,I don't see any point as the motor itself is stock,I run one on the Tdi as I fitted D/Gas to it and like to stay under 500 degree's under load. Pat

[Marty90]

Ive been banging on about this for a long time. Apparently both BAS and Alive tuning think different.......ive been told to keep some back pressure is the exhaust...even though the whole back pressure in diesel myth has been disproved.

My 2.2 is remaped, intercooled and decated and Centre muffler will be removed tomorrow :cool:

Hi Nando,
So is the centre muffler gone?Does it go better,sound better? Where'd you get it from?

[1nando]

Hi Nando,
So is the centre muffler gone?Does it go better,sound better? Where'd you get it from?

Hi Marty,

Didnt get s chance yet. The car is at graeme coopers getting a service. Once i get it back im going to tuffy at alexandria to get the centre removed and a straight through section put in ;)

[AlecW]

Is there any issues with legality or warranty by doing this?

[n plus one]

I've got no mufflers in mine but have retained the cat - slightly improved pick up and a bit of a note (mostly from outside the truck). Droning hasn't been an issue to date.

[Chops]

Pat and Shane.

Thanks for the info Pat. I did wonder about this a couple of weeks ago when I had to remount the heat shield on it. A pain in the butt,,, thought to self,, maybe I could just take it off ;)
I've got some exhaust wrap to go on, but haven't got to it yet.
In my car, I get roughly 570 consistently from when the light comes on, depending how I drive (city). I do notice when I fill it, if I give the car a wriggle as I fill, I get a couple more Lts into the tank/hose, which can make a huge difference to how far I go.
I've had figures of 620 to the light on a few occasions, but during those times, I've not gone over 100K's on the clock, which is about 95/6 on the Garman/Hema.

Shane, thanks for the info on the heat/sound shield. Your report is good, think I'll invest in some of this stuff when the cash is there. Did you end up with much left over (?), just looking to see how much I should order. Do you know if its purely for inside the car, or could it also be used under it as well? I have to remove the gearbox soon to replace the clutch, so it might be a good time to deal with this. I was just going to use alloy type sheeting, similar to what is around the turbo now.

[Blade74]

I removed the centre muffler and cat from my TD5 90.
I def over boosted way quicker than before and had a totally different engine noise coming through from the motor itself.
Like a really weird grumbly noise.
Kinda like the noise of a bearing about to distort itself.
Was a little worried about over spin.
I backed of the turbo a fair bit and it's helped.
My car had heaps of sound treatment so it wasn't any louder inside.
A nicer sound behind the car too.

[Marty90]

Hi all,
Resurrecting this thread as it's been about eight months since original posting and I was wondering if opinions have changed in that time.I've noticed on another thread a member has blown his turbo after removing all the restrictions,but he'd gone to 3" dia.

[D90 orkney]

I too am interested in this. I've just done the 170 BAS tune and am very happy with it just seeing if this is something good to do or not. Seem to be mixed opinions. Would love it to change the sound of the car as I find it a bit tinny

[Tombie]

I haven't deleted a muffler, rather, I fitted a 2.5" straight through box...

[D90 orkney]

On a 2.2?

Change note of exhaust? Spool quicker? Heat under your feet?

[PAT303]

Haven't had a single drama,our TDCi is Tracey's daily driver and she doesn't know the meaning of mechanical symphony,it's about to hit 140K. Pat

[Tombie]

On a 2.2?



Change note of exhaust? Spool quicker? Heat under your feet?



2.2
Less heat
Spoils quicker
Still silent excepting a small growl on start up
170 tune

[cal415]

Heres how mine sounds 2.4 130, i didnt notice any difference in the cab after any of the exhaust mods but you can certainly hear it with the windows down - i have done some sound proofing but not heaps.

Initially i did a big IC, Alive tune and removed the middle muffler, it sounded no different at all inside or outside the car but went a hell of a lot better, i then changed the turbo to the alive billet hybrid turbo and remove the cat, it gained a decent amount of top end power and sounded completely different exhaust note wise. It also has a very noticable turbo whistle now.

https://www.youtube.com/watch?v=uz_9mc8K11Q

[PAT303]

Goes like a cat with it's arse on fire :p. Pat