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Nissan 2002 GU TD42 Coil Cab
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Discussion Starter · #1 ·
Does the performance of a mandrel bent exhaust system outweigh the cheaper versions?
Can anyone supply figures?

cheers
Nightjar
 

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Y2KGUII ZD Wgn
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Does the performance of a mandrel bent exhaust system outweigh the cheaper versions?
Can anyone supply figures?cheersNightjar
Mate I have a 2 3/4 Mandrel bent on my zd30 best thing I ever did, 16hp up overall, max torque achieved 1400 revs lower and increased by over 20%, For my money it's worth every cent, hope those numbers are what your looking for.
 

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Autos are Superior
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I'd say on a high performance car yes mandral would be the go.

but on a ****ty 3ton diesel pumping out a whopping 100kw it wouldnt make **** difference.
 

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The Prodigal Child Has Returned
nissan
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Mandrel bent systems maintain the diameter of the pipe and wall thickness through the bend. A press bent system squeezes the pipe in the bend about 1/3 of the original diameter.

This bend not only restricts flow but also leads to deteriation of the pipe much more quickly as the wall of the pipe becomes thinner and the area at the start of the press is prone to higher corrosion.

Mandrel bent all the way. Stainless if you do a lot of water work (boat, water crossings, snow) good quality mild steel for most other applications.
Mandrel bent makes the wall thickness thinner, due to haveing to strech further.

I'd say on a high performance car yes mandral would be the go.

but on a ****ty 3ton diesel pumping out a whopping 100kw it wouldnt make **** difference.
I'm kinda with ya truckster, I do have a mendrel system but it's just because i could.
A 3" system would be just as good as a 2'1/2 mandrel bent i would think.

Please excuse the spelling and stuff i'm kinda blind at this point in time
 

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Y2KGUII ZD Wgn
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There will never be total agreement on this subject and to a point everyone has a degree of correctness, but, the main point is the quality of the job and materials. Sure mandrel bent thins the walls (slightly) but if it's good quality tube covered in good quality coatings the differences in life span will be minimal.
Mandrel bent will flow better than a pressed unit for the same size no matter what the engine size or power output, that's the properties of physics for you.
To sum up, if you have the bread go top quality mandrel, if you don't want to spend that much go for the best quality pressed you can afford. The common denominator should always be the quality. Quality can be defined as "what the customer is willing to pay for their requirements", so it's up to you, but logically you don't want it as a rust stain in your driveway in a year or two.
I note "Wish I had coils" comment of, "I do have a mandrel system but it's just because I could".
 

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Nissan CRD
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The 3" Mandrel bent system on my CRD makes a big difference to the performance of the poor little 3litre 4 potter pushing it around. (Needs all the help it can get)
 

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Elmo
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I'm wanting / needing a 3" mandrel bent for my zd30. How much am I looking at? I like the look of the price for the Scott rods system.

But which place is recommended for what price?

I was quoted like $1400 for a 2 3/4 mandrel from beauy exhausts.

Any thought's ideas?

Cheers

Deccers
 

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NISSAN
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Paid $1200 fiited for sterling 3" mandrel bend, high flow cat. I notice the differnce straight up more grunt earlier in the rev range. When my troll comes back tommorow it will be rapid chiped too :)
 

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Once the exhaust is fitted do you have to make any adjustments to stop it over/under boosting or any thing else??
 

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Y2KGUII ZD Wgn
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Once the exhaust is fitted do you have to make any adjustments to stop it over/under boosting or any thing else??
Mine didn't overboost to the point of limp, but they can, mine just spooled up very quickly giving me a bit to much boost at low revs (not always good), adjusted VNT stop to suit.
 

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What about with the CRD, do you require an other changes once fitted or was it bolt on and drive ?
 

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Nissan 2002 GU TD42 Coil Cab
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Discussion Starter · #16 ·
Great reading fellas, always interesting seeing the different experiences members have had.
Are there any stats on what size pipe is most fuel efficient for varying litre sized diesel engines?
We all probably know the TD42 engine had a blocked nose (exhaust outlet) which restricted the engine ouput to try and meet world standards.
Are the newer engines also restricted?
 
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