So I kind of know the answer but am going to ask anyway- is anyone selling any single turbo SBC manifolds/hot side that work well in our cars? Anyone that can make good ones on short notice?

I don't have time to make what I want for this setup(wife pregnant w twins, if I don't get it done soon I doubt that I'll have time to do major work for a _long_ time) so if I can buy something workable and get it in fast I could at least have something that I can tinker on when I find a few min.

 

What i'm doing on my 86' for a cheap budget turbo build is using the stock manifolds and y-pipe.

I'm taking the stock y-pipe and connecting it together so that the drivers side manifold flows into the passenger manifold, then I took a 6.5L Diesel Turbo manifold and cut off the entire turbo mount flange and had it welded to the top front of the passenger manifold so that the turbo will sit just above the valve cover like it does in the 6.5 Diesel.

 

I've tried talking to these guys to see if their single setups, either cast or header manifold kits could fit in a thirdgen, but they'd need a kmember or donor car to see.

www.lt1boost.net

http://www.camaroz28.com/forums/forc...o-kits-840403/

 

Crap my bad, I didn't read that you wanted to BUY a turbo manifold setup.

 

Mark, I just pushed a single turbo header set (ebay set) to 20 pounds of boost pressure, took it like a champ. All I did was fabricate a crossover for it because the one that comes with it is as thin as a potato chip. If you can keep your exhaust to boost pressure ratio near the 1:0 range, as well as your EGT's kept to a more feasible temperature, they will work just fine and won't crack. Only thing I don't like about them is how they welded the primaries to the log/turbo flange, it isn't precise and most definitely causes an obstruction in flow...

 

I guess that I don't have a problem with something that simple, but right now I don't want to get into welding up another set of manifolds. I've done them before, just don't have the time and patience.

 

Which turbo headers? I seem to remember you started with some and then gave up on them. Started looking at your old thread and looks like you deleted most of your posts (wondering why?).

the fact is that since I want to run a holset which has a flange about half way between a T04 and T06 so I'll probably end up modifying whatever I get

 

XS-Power still offers the single turbo header setup. Just need a new crossover because the one that it comes with is very very thin, and will crack very quickly, but the headers themselves are surprisingly strong...;

http://xs-power.com/gm-turbo-manifolds-3.htm

 

Both the log header and cross over pipe I have measured before are the same thickness. Are you saying that the cross over on yours is thinner than the log pipe? You may want to check.

Both measured 18-16 gauge thick.


They are reasonable for $210. Of course, they won't last forever but will do what is needed in most applications. They require lengthening the cross over and modifying the log to clear a normal sized starter. Cyl #7 plug clearance is usable but is better modified to clear the spark plug. Probably about 2-4 hrs worth of work. Overall, it could be installed & running in a day. As a comparison, just the modified TPI log headers take me over a day to make.

Have you thought about just welding a box onto a right side TPI header to accept a cross over from the driver's side? As in cut out a rectangle on the outer part of a passenger side TPI manifold, weld a piece of channel to it with the top capped and the crossover inlet in the bottom. Eventually I want to try this in a few months to see how it works. I think I can do it in a few hours. The worst part is doing the cast iron preheat, weld, post cool using the fire pit. If you simply welded it without heat you could fab it in 1-2 hrs.

I think there is even ebay GT45 kits for $550 using this header. I am not sure if the HX50/55 comp housing will clear the hood with the ebay single header.

Is it an HX50/HX55 odd ball star shaped inlet?

 

Which header is that? looks like you're talking about the xs power header before that and then you went to cast manifolds, so i'm not sure if you're talking about the header or modified manifolds.

I have an HX55, but for the 305 I will probably use an HX52, it's the big hx5x compressor housing and wheel with a smaller turbine side. If anything it's smaller than a comparable GT or BW turbo, so if they can be made to work there should be plenty of room.

It uses a 4" inlet, v-band flange outlet (which btw, I haven't really found a good source for the the compressor or the turbine outlet for the HX turbos, they tend to be the same from the HX3x-5x turbos), the medium size turbine inlet flange and again, a v-band turbine outlet.

Not sure what you mean by a star shaped turbine inlet.

I suppose that I can use the GT4202 that I have sitting around but that thing is huge both WRT to packaging and I suspect will be slow spooling on the 305. I suppose that I could buy something if i decided to, but not in a hurry to buy a questionable knockoff turbo and don't really know of anything that will be better than the HX52, and if I wanted bigger I'd go with the GT which should be similar to a BW 475. Willing to listen to suggestions there if someone has a strong feeling, I really like the HX, but the different flange limiting future upgrades without cutting and welding is somewhat annoying.

 

I have a spare set of Edelbrock headers w/y-pipe lying around if you want to piece one together using that. Cut the primaries off of the passenger header, leave about two inches of course, then weld them leading into a 2 1/2" log. Weld in your turbo flange w/wastegate up top, weld in your crossover entry on the bottom, redo (extend) the crossover to reach the entry, and your done...

 

Do you guys mean on the turbine side...?

 

I would stick with the Holset HX turbo.
I was referring to the ebay headers with the GT45 turbo for $500 on ebay.

After building headers & logs from scratch I found it much faster to buy and modify the ebay headers. Granted the from scratch will out live the ebay header, but it really depends on how much use the system will see. Most turbo cars end up being barely driven so the ebay headers work fine.

This is the star type inlet on the HX that I was talking about. I don't know of anyone that sells the flange. It is more of a bowtie than a star pattern. In between a T4 and T6.