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Making Lobster Back Piping

Proximity Motorsport

By Proximity Motorsport,
in Fabrication

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Daniel R32
Daniel R32

Thought i might as well throw up some lobster backs ive done. Did this 33 with all bends lobster backed, and everything in the engine bay lobster backed.. Even the straight sections were made from lo

scotty nm35
scotty nm35

I back purge all my stainless, the black eruptions on the back are a bitch to grind back so I feel its worth the gas so I don't have to. I haven't used the pulse function much, perhaps I should play

scotty nm35
scotty nm35

I love the freedom lobster piping allows for tight bends and spiral work. Here is a stealth boot mount GT35 in a V8 Soarer I worked on recently.

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scotty nm35 Grand Master

scotty nm35

Posted
Posted

Thanks for the heads up guys, I went down to Supergas for a winge today and ended up speaking to the sales manager on the phone while at the counter. He ended up giving me a 10.5m3 refill for $125, less than half what I was paying.

I don't have pics of the damaged manifolds, one I had to repair, and one I saw on a car, the crack was definitely down in the webbing but it could have started beside the weld and cracked further away as it made it's way around the pipe. I didn't get a good look at it as it was on the car. It was probably 2mm tube so very thin and light stainless. It would glow white hot on the dyno within a second or two of hitting boost. My point was, he had a GT42 mounted without a hanger or support, and a 4 inch exhaust with no hangers till the diff. Perhaps it would have lasted longer if the manifold could move around on the head a little and the turbo was supported.

scotty nm35 Grand Master

scotty nm35

Posted
Posted

Still need to make a inlet for the bov

Let me know what you guys think !

Looks good Angelo, just face the BOV return towards the compressor, cut on a 45 degree angle, and weld it in. It will take a while to die grind the hole, partly the reason I use alloy for my intakes as it's much easier to shape the holes in.

Mick_o Grand Master

Mick_o

Posted
Posted

Good news on the gas mate! What kunce though slugging ya that much a bottle especially when it looks like your a regular customer who does a fair bit of welding ;)

Im doing some pipework on my dads GTR tomorrow so hopefully I can get some pics up afterwards :)

Thanks for the heads up guys, I went down to Supergas for a winge today and ended up speaking to the sales manager on the phone while at the counter. He ended up giving me a 10.5m3 refill for $125, less than half what I was paying.

I don't have pics of the damaged manifolds, one I had to repair, and one I saw on a car, the crack was definitely down in the webbing but it could have started beside the weld and cracked further away as it made it's way around the pipe. I didn't get a good look at it as it was on the car. It was probably 2mm tube so very thin and light stainless. It would glow white hot on the dyno within a second or two of hitting boost. My point was, he had a GT42 mounted without a hanger or support, and a 4 inch exhaust with no hangers till the diff. Perhaps it would have lasted longer if the manifold could move around on the head a little and the turbo was supported.

scotty nm35 Grand Master

scotty nm35

Posted
Posted

I have a couple of vices, and a set of small vice grip pointy pliers. None are big enough for 4 inch unfortunately, I need to find a larger vice or find another way to hold larger tube.

I am making this 4 inch intake atm, for a GTX35 in a 33. The VQ afm should be good for over 450wkw resolution in 4 inch tube by my calculations. To be tuned with a PFC. :)

post-63525-0-42753000-1379429933_thumb.jpg

post-63525-0-89247800-1379429990_thumb.jpg

Roy Grand Master

Roy

Posted
Posted

The reason thin walled china manifolds crack is due to expansion, they would crack just as easily if purged imo. If the manifold flange is split and the turbo/exhaust weight is carried by a well designed bracket of some sort, the manifolds would probably last for years (on road cars at least.)

I only purge exhaust pipes when the die grinder can't get to the back of the weld, this isn't food grade exhaust I am working on, and at $300 a bottle of argon I'm not going to waste it back purging unless I need to. I have never had any dump pipes or exhaust returned from weld failure either, track cars included.

One thing i can say, I definitely prefer to weld thin wall (1mm or thinner) while back purging as I am much less likely to blow holes and can crank much more current in. No doubt it is stronger, but this isn't a structural item we are talking about. Perhaps you get better pricing on Argon through your work Mick?

My 2c ... chinese manifolds crack not due to absence of support or purging...its purely down to the fact that there isnt any penetration. I have only looked at 3-4 China manifolds but none of them had any penetration. Even my old Greddy manifold only had intermittent penetration. Purging of course helps ontrol peno without cauliflower so is related.

shaunus Enthusiast

shaunus

Posted
Posted

Looks excellent! However, couldn't you have rotated the housing to avoid having that elbow?

r32gtrs Rookie

r32gtrs

Posted
Posted (edited)

Looks excellent! However, couldn't you have rotated the housing to avoid having that elbow?

Thanks. There was a reason i did it like that an I can't remember why haha, possibly due tithe size of the housing and manifold position it may have hit ac lines and compressor or pwr steering lines not sure it was a while ago. It was just easier to do that, plenty of big turbos are positioned the same. And since I was doing it in lobster back why not show off the stainless work. Edited by r32gtrs

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