Thread: TD5 tubular manifold.

Hi Justin,

Never tried TIG welding, Mig, gas and arc only so far!

Pete.

I've not done it yet either, I watched the guy assemble/ fabricate my intercooler and turbo pipework, and it looks reasonably as easy as MIG, but I guess practice makes perfect.

JC

shame you're not in sydney pete, if you could tac all your pipe work with a mig I could do a side order & take your work to TAFE and TIG it all up. Stainless is soo nice to TIG and when polished , it comes up.....

If you manufacture it from Mild steel then you could oxy it with a similar end result.

I've been thinking of making up a set for my Disco. Being a 300Tdi, I'd have to change the turbo as well. So until someone donates a turbo () I probably won't do it in the near future.
They aren't that hard to make. I built the full exhaust system for my Datto 1200 (L20B engine) from the head to tail pipe. The easiest way is to buy a box of 90 and 45 degree mandrel bends and start cutting and tacking together with a mig. Once all done and tacked, go back with an oxy and weld it up.

Originally Posted by justinc

and it looks reasonably as easy as MIG, but I guess practice makes perfect.

I've used TIG a couple of times and it is very similar to Oxy. It requires better heat control than MIG and gives a better finish. Practice does make perfect ... I need more practice!

Originally Posted by justinc

Stainless steel and TIG welding are the neatest and best method for this, and certainly well worth the extra $ and effort.

I did my Datto extractors in mild steel and then had them ceramic coated. The advantage of the ceramic is that it is coated inside and out and retains heat which gives better performance on a turbo charged engine. Possible better than stainless, but I'm not sure.


Paul

I would consider it if we were talking 300TDi. My TD5 is an auto and I don't know that greater torque down low will be all that noticeable given the TC in the auto will be allowing the engine to rev up without having to deliver heaps of torque. My 300Tdi is a manual and I am assuming that the real gains of equal length pipes and VNT are going to be felt more in a manual.

Originally Posted by slug_burner

I would consider it if we were talking 300TDi. My TD5 is an auto and I don't know that greater torque down low will be all that noticeable given the TC in the auto will be allowing the engine to rev up without having to deliver heaps of torque. My 300Tdi is a manual and I am assuming that the real gains of equal length pipes and VNT are going to be felt more in a manual.

You would probably notice it most on the open road when the torque converter is locked up.

If you aren't going to use a split pulse collector (and it would be hard on a 5 cylinder) try and use a merge collector design to minimise volume changes and keep velocity/heat up right before hitting the turbine.

I've made 4 cylinder ones in mild steel, (4 individual tubes are cut so that when fitted together they merge smoothly and form an internal 'pyramid') a 5 cylinder one could be challenging !