Hey guys, Im interested in changing up my setup this year. Im running a D16a6 with a vitara block, head has a crane turbo cam and some mild port work.

I was running a cast "stainless steel" manifold with the wastegate offset, mated to a garrett 50 trim turbo and the setup is running fine as it is, but I am not a fan of how my downpipe is on the drivers side and has to curl under the turbo. My intercooler is a double backdoor aswell. Im currently running 25psi.

This is my manifold, but Im currently running the turbo flipped the opposite way


Im basically just looking for manifold ideas, that will fit in a Crx with a half rad that isnt ghetto slanted but is already mounted and in use. The Crx engine bay being the key part, its small compared to EG and EK.

Are there any good options out there that are new or exciting? I love the idea of cast, as there are no issues with cracking, but there arent many options. I like minirams but hate the oil drain issues..

Im just a little bored of my current setup

 

more boooost

 

That is an interesting manifold...

but isn't it a bad design with the offset wastegate?

 

Hes running 25 psi

Most likely holds boost good


Say he wanted 6-8 psi he would probably have a hard time with a small waste gate

 

Isn't only 'relieving pressure' from the first 2 runners though?

just wondering.

 

yea unless theres and elbow involved.

id say maybe change the manifold or add an elbow, and update the turbo. something billet that can actually take high psi before passing the effiency zone

 

Good design would have the wastegate located at the common merge point. You're right, this design seems to redirect only 2 cylinder's exhaust gases, maybe even 1. With this setup I would expect to see the boost climb after wastegate has openend.

 

So if OP is looking for anything new....

would this be a better manifold design?

http://www.go-autoworks-store.com/gocairtuma.html

 

certainly. just curious if a tubular log flows more. i never really paid much attention to logs or cast unit

 

Me neither, I'm learning about different designs and what is better, or really, what does one REALLY need to achieve their hp/torque goals.

 

i try to stay somewhere near the line of not maxing out, leaving room to grow. when i was first learning bout manifolds, i thought it was pretty easy deciding whats right for me.

 

It's not about just exhaust energy volume, (which is what I think you're getting at). You have to look at velocity, repairabilty, and utility.

In many instances, as much as cast manifolds are a popular (less expensive=popularity), many that are made have a specific utility that causes 1) for most turbochargers that are to fit with most of them to require the use of a 5 bolt Ford style turbine housing, which in most cases causes 2) the need to cut the block webbing in order to fit anything even close to about 7.5" diameter compressor cover... (usually anything the size of a T04E).

This is why from about 2001-2010, Revhard, Inline Pro, and even DRAG were kings of the Turbo Honda world; it was expected that all people planning on using them will use the Ford Style 5 bolt Garrett/Precision/Turbonetics turbochargers. But this was when even the cast-pressed iron manifolds contained at least some amount of nickel to keep their formations consistent without cracking. Nowadays, with the exception of a few companies that are not part of the eBay world, that nickel is not present any longer.

With the tubular log manifolds, you have a LOT more options for both direction of the turbocharger to use 3" downpipes with more flexibility, allow for changes in the manifold for other wastegate flanges, and still use quality parts.

Now, as for "flow" capabilities, that ls_joker is so worried about, I can easily say with confidence that these tubular exhaust manifolds do quite well for over 400-550whp without a lot of backpressure issues, (depending upon turbine wheel size and volute in relation to the exhaust manifold).

Look at Evolutions from 6-10; all still use log style manifolds and even tubular logs for over 500whp without reaching the dreaded 1:1 backpressure ratio. Perfect example is Californiadad's 1st build using a tubular log. Over 526whp on 91/meth with no backpressure issues, and wonderful drivebility. If something cracked, instead of working hard with cast iron, a good fabricator could work easily with the schedule 10 steel that most quality companies are using.

Regardless of how many may feel, there's always a matter of options. But I warn that simply because a manifold is of cast-pressed iron alloy, doesn't make it better than a tubular log manifold, and in some ways, is more limiting.

 

I have zero boost issues with this current manifold even with the crap wastegate placement, holds boost rock solid no creep at all set with a NXS manual boost controller.

The spa looks like a great choice for wastegate placement and ease of maintenance, reliablilty of a cast unit is obviously a plus aswell. Id likely gasket match/port/polish it as much as I could. Turbo blanket would be an absolulte must though, if it would even clear the hood in my little Crx

A mini ram seems like another solid option, but I see none made for a Crx with good wastegate placement that doesnt put the wastegate right into the hood latch support

 

^^^ I'm sure you'll get, what you feel is in your best interest, (although I honestly believe that your particular concern as to what you consider to be a wastegate placement issue is not as much of an "issue" as you're making it out to be..) But.. We digress and concede... You asked about "newer" things and ideas.. You got 'em..

 

Shodan, maybe I'm not understanding you correctly, but I'm the one who asked about the wastegate placement issues.

 

Ah. Ok. Let's chat, then. Give me, (if you wouldn't mind ) your perspective specifically on which type manifold you're seeing wastegate placement issues..

 

I would like to preface that I have no turbo car experience, therefore I also have no idea of what is 'better,' and that my question was merely a question and I am intending to learn, rather than debate.

What I have read though is that the wastegate should be placed so as to relieve an equal amount of pressure from all the runners. Ideally, it would be centered over where the runners merge, rather than over 1 or 2 runners (like in the first manifold the OP pictured.) The other manifold I linked (the cast one from go autoworks) has the wastegate flange over the 'middle', therefore theoretically being a better placement.

In the welding random chat thread, 850, and onebadturbocrv both built or are building offset long runner designed manifolds like this:



Where that placement is ideal for the wastegate as all the pressure from the runners are going to hit that wastegate evenly, therefore controlling boost pressures easier?

 

Dude i reversed googled that image and it popped up on another forum from 2011

I told you onebadcrv is a fraud

 

Not trying to defend him, but he did say he was making one 'like' that one iirc.

 

Oh oops

I take it back then

 

Yeah I just went back and looked at the whole post, he said he was making a collector and posted pics of that and then showed this pic..I think he meant it as an example.

 

I seen some with the wastegate on the passenger side. But I had a mini ram on a B in an ef and it had no issues with the hood latch. Not sure how that sits in relation to a D.

 

@kevinEF7 are you specifically looking at a log style? from what I understand GO auto can do most of there manifolds available modified specifically for a CRX

 

In some ways, yes. But even if the wastegate flanging isn't in the most ideal, location, doesn't mean that that boost control and use is automatically "bad". Even if it is between 1 & 2 runners and not "centralized", as long as it isn't just the one runner, and uses the right sized wastegate relative to the turbocharger size used, there's usually no problem.. This is on the presumption that the tuner is properly using ignition timing with fuel to not be so conservative as to cause any of the very boost creep issues he/she plans to eliminate during the tuning process.

Now, having a wastegate in a "teardrop" fashion and centrally located at the collector (even if it is 90* to the collector) is great; as long as it serves the correct purpose. But based upon what you're looking for in your project, going to a Hytech style "sidewinder" is just not necessary to achieve good results.

 

I had alot of troubles with nuts and bolts loosening this year, and with my current setup alot of them are hard to get to. I tried Nord locks, high temp sealants, I ended up drilling quite a few of the turbo/manifold/downpipe bolts and using safety wire which did the trick. But having easier to access bolts for "maintenance" tightening would be a huge bonus.

Ive contacted a few companies about there miniram manifolds in a Crx chassis, but as of right now the SPA cast top mount is the strong contender for my checklist