Turbo headers

Speedy

Speedy

Club Member
Stainless steel or mild steel and why is one better then the other? Looking to make around 800-850hp 1 5/8 or 1 3/4 primary? Thanks for your help and input.

Mike
 
my8950 said:
search works real good...there are about 85 million stories and people opinions on which to use....
I have stainless, 1 5/8 will make that kind of power....
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I was in a hurry and posted up. I'll try the search later. Thanks for the input everyone. Feel free to post up pictures of your set up and who's kit or builder did them.
 
So what's the down fall to mild steel? I know stainless likes to crack and I'd think the mild steel would be more forgiving. Am I wrong?
 
Speedy said:
So what's the down fall to mild steel? I know stainless likes to crack and I'd think the mild steel would be more forgiving. Am I wrong?
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i have 1 3/4" stainless for mine. i was told that mild steel can rust out or deteriorate on the inside and essentially it goes through your turbo which is not good....?
 
I made fixtures off my HP kit. So the headers could be copied perty easy. If you are handy with a welder. Plus I made my own flanges all the way around. ;) SS would last almost forever but I you coated the MS then it would last for a while I would guess. As for size Hell I dont know.
 
Stainless will keep the rust flakes out of the turbine. Even coated in and out, you'd be surprised how fast mild steel will rust when it's used on the hot side. The first time you take it apart you'll see a bunch of rust in there.

I did some a bunch of research when we did mine, and 1 5/8 primary tubes and a 2.5" crossover seem to be the way to go. I know of 7 second cars with this combo.

Going to the turbo stuff was a little bit of a learning curve compared to the N/A and supercharged stuff I had before. I was a little surprised at how much stuff that was important before just doesn't matter when you run a turbo....and how much does matter that didn't before.
 
P.F.M. said:
I made fixtures off my HP kit. So the headers could be copied perty easy. If you are handy with a welder. Plus I made my own flanges all the way around. ;) SS would last almost forever but I you coated the MS then it would last for a while I would guess. As for size Hell I dont know.
Click to expand...

Sweet a fixture! Yeah I here you can coat the M/S one with like a Swain tech coating but I'd have to look into that a bit more. I'll probly go S/S but not sure about size either.


Sean it'll be a 351 based motor. Trying to get a 408 off a buddy right now. As for turbo size think 70 or so.
 
Fryguy302 said:
Stainless will keep the rust flakes out of the turbine. Even coated in and out, you'd be surprised how fast mild steel will rust when it's used on the hot side. The first time you take it apart you'll see a bunch of rust in there.

I did some a bunch of research when we did mine, and 1 5/8 primary tubes and a 2.5" crossover seem to be the way to go. I know of 7 second cars with this combo.

Going to the turbo stuff was a little bit of a learning curve compared to the N/A and supercharged stuff I had before. I was a little surprised at how much stuff that was important before just doesn't matter when you run a turbo....and how much does matter that didn't before.
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So sounds like 1 5/8 will be more then enough for my goals. Thanks Raj!
 
Speedy said:
Sweet a fixture! Yeah I here you can coat the M/S one with like a Swain tech coating but I'd have to look into that a bit more. I'll probly go S/S but not sure about size either.


Sean it'll be a 351 based motor. Trying to get a 408 off a buddy right now. As for turbo size think 70 or so.
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Mike- If you're going to put a T70 or 76 on it, do not get a 408. Make the motor as small as possible. You'll want the block strength of a windsor if you're not using a race block, so I'd go no bigger than 357cid. The smaller turbos like that will work better with a smaller motor.
 
Fryguy302 said:
Mike- If you're going to put a T70 or 76 on it, do not get a 408. Make the motor as small as possible. You'll want the block strength of a windsor if you're not using a race block, so I'd go no bigger than 357cid. The smaller turbos like that will work better with a smaller motor.
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x2
 
Fryguy302 said:
Mike- If you're going to put a T70 or 76 on it, do not get a 408. Make the motor as small as possible. You'll want the block strength of a windsor if you're not using a race block, so I'd go no bigger than 357cid. The smaller turbos like that will work better with a smaller motor.
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Dang that throws a wrench in my plans



Pwraddr said:
X3...Mike I didn't know you were going turbo?
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:D All out on this build lol. Figured these is my last chance at building a bad ass car so go big.



Thanks for all the info everyone! +1's going around :)
 
70mm would be a bit smallish for a 351 and way to small for a 408. If you go with a 351 run 1 5/8 is you plan to stay under 6500 rpm if you go with a 408 I would run 1 3/4 if you stay under 6500.

For a 351 under 6500 I would go with a out of the box s400 preferably with a 1.10 hotside and 87mm wheel.

For a 408 I would go 1.36 hotside same wheel or the 96mm wheel. the larger 96mm will spool a bit slower. I would also sugest the 80mm upgrade comrpessor for use upto 6500rpm on a s400 and a 408.

Stainless all the way. Mildsteel has problems with carbon creeping. The tube wil not rust as much as it will just crack off one flake at a time. The ultimate material for turbo headers is inconel. 304 stainless at a minimum and 316L is prefered or 321L is the best then inconel.


Speedy said:
Sweet a fixture! Yeah I here you can coat the M/S one with like a Swain tech coating but I'd have to look into that a bit more. I'll probly go S/S but not sure about size either.


Sean it'll be a 351 based motor. Trying to get a 408 off a buddy right now. As for turbo size think 70 or so.
Click to expand...
 
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