Welding Steel to Cast Iron. Good? Bad? The Ugly? (Wastegate Questions)

[Red-KAT]

All right more things bouncing around my head and I just need others input.

Idea 1: How many of you have had success welding a steel waste-gate flange to a cast iron mani? I need to increase my waste-gate flow and I'm thinking of going external.

Idea 2: I can’t find someone that sells Cast Iron waste-gate flanges... It would be handy to keep the metal the same for expansion / cracking issues... Have any of you run across Cast Iron 38mm waste-gate flange?

Idea 3: Someone posted a site that had all the parts (elbow’s and such) for making your own mani. I can’t find this site... I could make one myself that mounts to the same spot as the Greddy if I had access to tubes and such.

Also will a 38mm flow enough air to keep me below 10psi if I upgrade cams with a full 3" or should I just fester up the extra cash for the 40mm?

I hear the TD06-20G is running a 20mm waste-gate hole... So 38mm is a huge upgrade.

Any idea would be great... I am looking at better option then porting the current one due to the cost of just taking the turbo apart is near $105. (Take apart and reassemble) I have not called the place Rick told me about yet but I'll do that today...

Thanks for the help!

[WDRacing]

If your going to weld your own mani then port your own turbo....It's not a hard thing to do my friend.

But to answer the questions, No you can't weld Cast and Steel together. It may stick from the beginning but it will eventually have issues. Especially with this part being super heated then cooled over and over again. Someone else may chime in here with some idea's, but I've never seen it work.

Bset of luck to ya. Keep us posted.

WD

[TrunkMonkey]

isn't the stock SR manifold cast iron? if so, SR guys have been welding steel flanges to their manifolds with pretty good success. personally, i'd let a professional do it. if you're as dangerous with a welder as me then you could make it work....just don't use the manifold when your done .

-demetrius

[WDRacing]

Ditto for me Demetrius

[574-240sx]

All right more things bouncing around my head and I just need others input.

Idea 1: How many of you have had success welding a steel waste-gate flange to a cast iron mani? I need to increase my waste-gate flow and I'm thinking of going external.

Idea 2: I can’t find someone that sells Cast Iron waste-gate flanges... It would be handy to keep the metal the same for expansion / cracking issues... Have any of you run across Cast Iron 38mm waste-gate flange?

Idea 3: Someone posted a site that had all the parts (elbow’s and such) for making your own mani. I can’t find this site... I could make one myself that mounts to the same spot as the Greddy if I had access to tubes and such.

Also will a 38mm flow enough air to keep me below 10psi if I upgrade cams with a full 3" or should I just fester up the extra cash for the 40mm?

I hear the TD06-20G is running a 20mm waste-gate hole... So 38mm is a huge upgrade.

Any idea would be great... I am looking at better option then porting the current one due to the cost of just taking the turbo apart is near $105. (Take apart and reassemble) I have not called the place Rick told me about yet but I'll do that today...

Thanks for the help!

I did some thing similar on a down pipe with a flange. It was for a temporary fix. Yes it holds good at first until it cracks. Too much stress, heatings and cooling, since they both expact and contract at different rates. Also the added weight of an exhaust and drifitng didn't help my situation. Not a good idea. Do it right the first time if possible.