Defender90td5

Defender90td5

Active Member
Hi all,

I have recently bought a Defender 90 with a trusty 200tdi in good health. I’m thinking about straight piping it as I’ve watched videos on YouTube and the turbo sounds amazing with a straight pipe with just the rear silencer remaining. I also figure it will reduce back pressure so in theory the turbo should pick up quicker. Am I correct or is this all just a bad idea?

Has anyone done this? If so how does it sound? Is the turbo pickup noticeable and is the turbo sound increased? Increase in horsepower slightly?

Regards

Robert
 
Yes I have done this because my Rangie is s 200tdi. Goes better and don't forget to use a bigger diameter.
Sure it sounds better and the smoke looks better too in nice puffy clouds when you accelerate hard uphill :D
 
anitarrc said:
Yes I have done this because my Rangie is s 200tdi. Goes better and don't forget to use a bigger diameter.
Sure it sounds better and the smoke looks better too in nice puffy clouds when you accelerate hard uphill :D
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What do you mean by a larger diameter pipe? Im hoping to keep the rear silencer still on so surely ill have to keep the same diameter to allow it to connect to the backbox still or am i wrong? Or would i have to replace the whole lot and get rid of the backbox with a 3" pipe?
 
Defender90td5 said:
What do you mean by a larger diameter pipe? Im hoping to keep the rear silencer still on so surely ill have to keep the same diameter to allow it to connect to the backbox still or am i wrong? Or would i have to replace the whole lot and get rid of the backbox with a 3" pipe?
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My boss gave me a stern look and said.. you are not going to keep that tailpipe? So it received a silencer from some Toyota Diesel and 2x 2.5 " pipes. The diameter was defined by the 300tdi Terrafirma straight pipe
 
anitarrc said:
My boss gave me a stern look and said.. you are not going to keep that tailpipe? So it received a silencer from some Toyota Diesel and 2x 2.5 " pipes. The diameter was defined by the 300tdi Terrafirma straight pipe
Click to expand...
So i need to buy another back box? Surely keeping the original backbox on and just taking the centre silencer out should make a huge difference? So it would effectively be a straight pipe from the turbo back with just a rear back box. Or am i just being ridiculous in thinking this?
 
Defender90td5 said:
So i need to buy another back box? Surely keeping the original backbox on and just taking the centre silencer out should make a huge difference? So it would effectively be a straight pipe from the turbo back with just a rear back box. Or am i just being ridiculous in thinking this?
Click to expand...
When my 200Tdi 90 ctr pipe went tits up I bought a st/st straight through ctr, easy to fit, not much more cost wise and less to go wrong in the future. There is a slight increase in noise but not enough to cause problems, cant say it sounds better though. There is a slight increase in power, a usefull extra rather than a reason to junk part of a good system if you see what I mean. My back box is still the std one.
As an example, there is a long hill near me, roundabout at bottom, 50Kph sign 2/3 rds of the way up. With the original set up, driven hard, I could just about get to 80 Kph as I got to the limit sign, with the straight through ctr pipe I can shave 20 meters off that.
 
frog hopper said:
When my 200Tdi 90 ctr pipe went tits up I bought a st/st straight through ctr, easy to fit, not much more cost wise and less to go wrong in the future. There is a slight increase in noise but not enough to cause problems, cant say it sounds better though. There is a slight increase in power, a usefull extra rather than a reason to junk part of a good system if you see what I mean. My back box is still the std one.
As an example, there is a long hill near me, roundabout at bottom, 50Kph sign 2/3 rds of the way up. With the original set up, driven hard, I could just about get to 80 Kph as I got to the limit sign, with the straight through ctr pipe I can shave 20 meters off that.
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Ah right I understand now. So just get a larger pipe straight through and remove the back box?
 
My 200 has a jansped s/s system and when I fitted the pto I had to cut out the centre box for clearance, cant say I noticed any difference of any kind noise or power.

Mate had a straight through side exit pipe on his 200 90 and whilst it was noisier it wasnt anti social, but covered the side of the car in black soot pdq.
 
I've got a straight through pipe to a standard back box. Makes no difference in power, no nice turbo sound. Just a droning sound that gets annoying on the motorway. But I do get a bit of a grunt when I put my foot down. Is it worth it? Probably not if your system is in good knick.
 
Pappasmurf said:
I've got a straight through pipe to a standard back box. Makes no difference in power, no nice turbo sound. Just a droning sound that gets annoying on the motorway. But I do get a bit of a grunt when I put my foot down. Is it worth it? Probably not if your system is in good knick.
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Ah right. Seen YouTube videos with the turbo whistle sounding nice aswell as sound a bit more grunty if that makes sense. Might not be worth doing then.
 
Pappasmurf said:
I think that is when the boost is right up, possibly even with a VNT turbo. None standard airfilter and no back box.
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Yeah I’m looking into the VNT turbos and seriously considering it. Maybe a straight pipe is the way to go in that case. Does it affect the MOT at all?
 
Defender90td5 said:
Yeah I’m looking into the VNT turbos and seriously considering it. Maybe a straight pipe is the way to go in that case. Does it affect the MOT at all?
Click to expand...
A straight through and turbo changes MAY make it difficult to pass the smoke test on the MOT, that's why I kept my back box.
I want a VNT, just for ****s and giggles.
 
I changed the centre section to straight through, because a stainless section was cheaper than a standard silencer. I can’t say I’ve noticed a particular power difference, sounds different but nothing spectacular.
 
Pappasmurf said:
But if you don't have your boxes, theres no filter for the smoke.
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The boxes dont filter the smoke they only reduce the sound of the exhaust note, some are resonance chambers and others are just packed with wadding with a perforated tube through the middle, the gases dont actually pass through the wadding itself the wadding just muffles the sounds of the gases.

It is a bit fo a science and well worth a half hour on google.
Then thers back pressure/scavenging/gas flow/balancing between the cylinders (you must have seen the fancy curved manifolds on f1 cars?) and then there are two strokes which are a whole new ball park.

Newer cars/trucks with DPF are another matter and they do reduce the smoke/particulates.
 
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