top mount turbo

willmoodom · Post by **willmoodom** » Thu Feb 28, 2008 1:25 am

has anyone attempted cutting the flange off and turning the many upside down and rewelding for a top mount? would that work?
Or maybe closing the bottom and welding turbo flange up top?

Post by **DJpowerHaus** » Thu Feb 28, 2008 8:26 am

I cut and welded my SS Autochrome manifold and it cracked withing the first few events and eventually the fell off. Cast iron probably wouldn't do too much better.

Consider making a nice log manifold with 304 Stainless flange and SCH 10 pipe. Make a equal length manifold if you really NEED that last 5%. I'd rather have strong and reliable myself.

willmoodom · Post by **willmoodom** » Thu Feb 28, 2008 1:58 pm

I assume the ss would fall apart, but a cast I figured would stand up especially since the only thing being cut and rewelded is the mani to head flange. How often are the flanges for sale on the questclub site? I'd love to have a custom header but I've never welded nor can I afford someone doing the job for me, assuming the fee for that is like closer to a thousand. Anyway, It was a legitimate thought. BTW who has dynoes of there g64/g63 producing more tq than hp?

Post by **DJpowerHaus** » Thu Feb 28, 2008 2:58 pm

My uncle is an amazing welder and he didn't want to go near my exhaust manifold. Most welders say that welding cast iron never turns out well, and if it does, not for long.

I think it would be safe to say we'd all like a top mount cast manifold. I'm sure we could get a dozen people on here to agree to that, who would buy one. The problem is that this group cannot agree on the turbo flange. If we could get a dozen people who all agreed on that, we could probably get Bill to have one designed and cast for us.

89coltgt · Post by **89coltgt** » Thu Feb 28, 2008 8:49 pm

I too would like a cast top mount manifold. Mitsu or t3 inlet would work for me. I wonder how much more it would cost to have them cast out of SS?
I may fab up a log style manifold once I get the welder out in the garage.

willmoodom · Post by **willmoodom** » Fri Feb 29, 2008 1:54 am

DJpowerHaus wrote:My uncle is an amazing welder and he didn't want to go near my exhaust manifold. Most welders say that welding cast iron never turns out well, and if it does, not for long.

I think it would be safe to say we'd all like a top mount cast manifold. I'm sure we could get a dozen people on here to agree to that, who would buy one. The problem is that this group cannot agree on the turbo flange. If we could get a dozen people who all agreed on that, we could probably get Bill to have one designed and cast for us.

How about something like mookie on sqclub. basic header with a mitsu flange and a adapter for a t3 or a t4? turbo should not sit up to high if the header is built at a slight downward angle. Is that even possible?

willmoodom · Post by **willmoodom** » Sat Mar 08, 2008 5:58 pm

due to all the people running custom manifolds and many people complaining of cracking. What determines the integrity and longterm condition of the manifold? I assume it was the amount of heat guys were producing with 30 and 40 lbs of boost with the big turbos. The most I will run is 20psi on something like a holset hy or 60-1. If I can get 2-3 years out of a custom mani on a daily driver, I will be happy.

rarson · Post by **rarson** » Tue Apr 29, 2008 3:12 pm

emachineshop.com says they do castings. They even list engine blocks as an example. You would have to download their software (free) and design it yourself. I have no idea what their prices are like, but if they are reasonable, then it's probably the best bet for a top-mount cast manifold.

I think I've heard of a few people using emachineshop.com with success, but I have no experience with them so I don't know. But I know it's been around for a while and I've wanted to try it out... looks like a pretty cool solution if you need something made and can't do it yourself (well, as long as you can design it).

Edit: Whoops, forgot the link: http://www.emachineshop.com/molding_mac ... asting.htm

silo · Post by **silo** » Thu May 01, 2008 1:40 am

Mine can be found here...
http://forums.austarion.com/viewtopic.php?t=10203

Feel free to copy

Silas

beaner · Post by **beaner** » Mon May 12, 2008 6:39 am

I have seen external wastegate flanges welded to stock DSM manifolds with success in the past. From what I have read, prior to welding, the manifold needs to be near red hot with a torch, then cooled down very slowly after welding, this was done by sticking it in hot sand for hours allowing to cool to room temperature.

It's worth a shot IMO considering a 1g turbo manifold runs about 10 bucks in these parts. So long as you have the patience to deal with it if it fails anyways.

2000_turbo · Post by **2000_turbo** » Thu May 15, 2008 3:32 pm

Here is mine.

http://projectzerog.com/forum/viewtopic ... highlight=

Gr,

Martijn.