Recycled exhaust manifold
 

I attacked my 1.8 manifold with a 4.5 inch grinder and a stick welder.
https://www.miataturbo.net/attachmen...ine=1337103680

4 hours later and voila! my no hit block special is born :giggle:

https://www.miataturbo.net/attachmen...ine=1337103680
https://www.miataturbo.net/attachmen...ine=1337103680
https://www.miataturbo.net/attachmen...ine=1337103680
https://www.miataturbo.net/attachmen...ine=1337103680
https://www.miataturbo.net/attachmen...ine=1337103680
https://www.miataturbo.net/attachmen...ine=1337103680
https://www.miataturbo.net/attachmen...ine=1337103680

next step vband!

Holy sh!t that is so damn boss!

Props to you, good sir!

Nifty
You used to see this stuff all the time, then everybody got baller.

That's awesome, really impressive work.

I need a welder.

Any pics of it mounted to the head? Thats some good welding with an arc welder in such a small space. Bet it was a pain on the insides of the runners, or did you weld them up, and then weld it to the flange?

I agree: that's good stuff.
And if you did a good job welding it, I don't see why it won't hold up for a LONG time.
Too bad our manifolds aren't made like that in the US

viperormiata, Full_Tilt_Boogie, pdexta, Miater, 18psi, Thank you men. Praise like that makes me feel alive!

The welding was easy enough. I welded the collector up first, then the runners and lastly the slip joints at the flange and collector. I used a small rod (1.6mm2 308 stainless) which is good for getting into tight spots.

(For a crazy but simple solution how about tying a stubby downpipe elbow back into the stock 2 to 1 piping flange and a close on vacuum operated screamer pipe through the hood! As if there isn't enough drama all ready when boost hits...but having to contend with a rocket launch as well!)

It may be a while before it gets mounted as the current set up on my car works well. Possibly a winter project.

https://www.miataturbo.net/attachmen...ine=1337287790

How about using a heat riser valve dumping to a screamer pipe? Has any one tried this? It closes with vacuum / opens with boost.

Probably a cabin mounted manual boost controller could be used to ramp the closing time or lock it closed.

Honestly that ^ seems like a better option than the spring flapper in the muffler.

I also have the feeling this manifold will have a deep subbie type growl.

When the 2nd cylinder fires, it takes a longer path than the next #1 cylinder then they meet about together. Then the 3rd cylinder fires takes a longer path than the 4th and again they meet together.

more recycling.... resonator skin to heat shield

https://www.miataturbo.net/attachmen...ine=1338819915

This guy gets double props from me. Yessssss!

Cool work. When I do fab work it ends up ugly or nonfunctional.

very cool

where did you find this?
LINK?

wut

da

FUKKK

damn that looks better than my stupid begi log manifold.

u r a god.

http://www.ebay.com/itm/390417734620...5.l2649http://

(On ebay I searched for heat riser or efe valve)

now suffering kind words induced Billy Elliot Electricity moment:giggle:

Hideously beautiful. Very ingenious and well-done!

This thread was great until the stupid cutout was posted.

Nonsense! Just replace it with a spare 1.6 TB or something. I'm sure our resident MacGyver could get it working!

Cutouts are stupid and pointless and provide no gains.

I saw some top end gains (maybe 4 hp) with the cut outs open (4" each) on my B5 S4 but those turbos were moving a lot more air than the average puny turbo on this site.

I kinda wish they'd catch on. I think one of the coolest builds you could have is keeping your OEM muffler, but also have a big ol' downpipe with a cutout. It'd be tough to do well enough, though the idea of keeping a completely stock sounding/looking system to avoid suspicion and attention is appealing

full 3 inch exhaust > cutout

How about a full 3" exhaust that makes little noise, to avoid suspicion, and always fully open so it spools better. cut outs are a gimmick joke rice mod.

but youre from FL so you couldn't understand rationality.

that's not difficult to engineer at all. just use a y (or two in my old car's case)

LOL you'z trippin.
My forester currently has a 5" exhaust system going into a 2.5" stock axleback very gradually (the taper is literally spread out through 5+ feet)


Makes 350/360 (verified last week) and curb stomps motherflossers while making next to no noise.

I have never enjoyed it more than I do now. And that's counting the previous setup of full 3" straight through all the way.

but with a stock downpipe and exhaust it should bring significant gains?

https://www.miataturbo.net/attachmen...ine=1339017541

Well that kinda cutout is a little different.

I think it will work well and if it opens soon enough provide appreciable spool gains since it is so close to the turbine outlet.


hey hay heay 18psi do you still have stock suspension on fozzie? I put my Feal suspension on and it is frikken awesome. i am prolly making 70hp less than you but the suspension increased fun factor by 10x. AWD drift ftw!!!!

William, the problem with cutouts is you need two different computer tunes to run your car because the volumetric efficiency of the engine changes when you open the cutout.

Really? Was that necessary? How much "rationality" is even on the forums? How is that rice even?

Anyways, it was an idea. I absolutely agree that a full 3" and a nicely sized Magnaflow is the way to go, and that's what I'd do without a doubt, as with my other car. I'm just thinking of other ideas..as I said, I like the idea of keeping stock exhaust parts for street.

I personally think having a big oversized and obvious shiny exhaust tip or two is as bad or worse than having a loud car. Its a psychological thing really.
Yeah, I'd have a Y where the exhaust would continue straight into the cutout and Y also into the rest of the exhaust. The engineering fun would be keeping stockish diameter without killing too much power off. I think something like dual 2.25" exhaust would make it manageable

I saw 16rwhp going from capped to open on the stock WS6. I thought turbo engines benefit greatly from open exhaust?

*edit* Why am I arguing for the Florida group....

World, please just ignore this post.

All STi suspension including alum control arms and sway. Feels great, though probably not as cool as your coilovers.

Boost activated cutout. Meaning it only opens at say over 3psi or whatever and its always open at 3+ psi so conditions are always the same.

As far as the cutout being right after the turbo.... what are you planning on doing with the wideband then?

check out my thread about it.

I think its actually a fantastic idea.
I have yet to try it tho

Personally i think this is better in the exhaust. Remember the thread a month or two ago about the little flapper in the muffler?

Yeah, and I love that concept too, except it still requires you to get an exhaust.
The 2nd most appealing thing to me about a boost-cutout is not having to spend money, time, and effort fabricating a full exhaust

lol I R lazy

I just checked out that thread anyways and see why Brain is so much against it...you already pissed him off about it :giggle:.

My idea is more of a passing thought, and I'm concerned about the long term aspects of having a big ol 3" downpipe merge into the godawful OEM setup with a Y. Honestly, just making a Y to adapt to the stock exhaust could be obnoxious enough. It should really be more gradual, about to the stock cat location, and by then, youve already replaced half the exhaust.

I have a different idea for what I'd actually do. Doing some research on it now, had the idea a while ago...dual 2.25" piping, because that's much easier to fit to a Miata than a 3". Plus I have a bunch of 2.25" exhaust bits

That definitely sounds like more work (and weight) than just doing a single 3" pipe.

Likely more weight yes. This would be a street car though without much power, so I'd like as much clearance as I can get, plus avoid having hot exhaust bits being close to things like the tranny and diff. I also was able to grab an RX8 resonator and some spare piping when I worked at Mazda, plus a friend had a full 2.25" setup on his S/C'd 318i, then switched back to a factory exhaust and gave me the old one (including a cat) since it was obnoxious.

Dont think I'd ever want more than 250rwhp with it, and thats a bit of a stretch as it is. I shouldnt be dicking with it at all, as its my DD, but I've already acquired a big pile of 2.25" piping. I'm not going to replace the factory stuff outside of the Magnaflow catback I already have, because I'm very happy with it and I think its the best sounding N/A sub 2.0 4 cylinder I've heard. I like my low end power, so I'd just lose more of it by installing it now.

If you got a welder than 3" exhaust sounds great however if u dont and someone else has to make it for you.. it will be bad as it will knock everywhere.

My exhaust was made by a monkey with a welder at the local exhaust shop... it was rubbing everywhere until i went back and bitched them out.. then halfway through emissions time came and when i hooked up the stock ecu i realized the rear sensor is dead because they hooked it up sideways and the wires got ripped by the driveshaft...

At last 150 or something for cat, another 120 for muffler and another 100 for a resonator + i think 100something for fabricating it = lot more than a cutout. You dont even need a giant cutout, a 2" cutout will be plenty.

real head turner for sure...cops are all over my ass (in more ways than one)

https://www.miataturbo.net/attachmen...ine=1339161996


I just think cutouts are stupid and pointless. They add complexity and defeat the purpose once they open. You can make a turbo miata near silent with the right exhaust choice with little damper on performance output.

Everyone says they want it to be quiet, but then if you get into boost all hell will break loose and you'll be screaming at 100dB making a few psi going up a hill; that's retarded stupid. I can't even hear my exhaust when I'm curising around...even in boost, only if I go maybe >20% TPS.

that screams STREET RACER

lol bro you don't like revving at ladies?

Did you see the MJ decal....think about what you just said.

Honestly my biggest reason for wanting the boost cutout is to eliminate the need to fabricate a full exhaust.
I also don't see whats so complex about it: just a EWG on the end of a downpipe with a vacuum line going to it.
And what is this magical list of parts you speak of? cat + resonator + biggest magna?

just noticed.

omg u r gey

Search for patsmx5's exhaust setup on here and m.net. That is a quiet setup.

:giggle:

That is pretty good! a friend of mine was on a budget and has just modified his mk1 manifold and turned it in to a turbo manifold, looks crap as its a mk1 manifold but works alright for a budget setup :)

Will be keeping an eye on this thread!

nice name hoe

That's a 3" pipe? Guess I'm used to looking at 3.5"s and my obnoxious 4" Magnaflow. I meant more the fart cans, chrome tips, etc. that I often see, and obviously not just on Miatas. I think black ceramic coating would look even better

link for lulz

Sounds like me!


This is a most important function and should not be overlooked in a well designed system! :drool:



I agree. The cutout opening should be selectable. I plan that with the low boost map it stays shut so 7psi through stock downpipe, cat and exhaust . With the high boost map it will open once you loose vacuum.
High / low boost selected by widow washer stalk so finger tip control for lady reving and other critical situations:rofl:

http://forum.miata.net/vb/showthread.php?t=334403

This one?

I literally just said "what the ----" out loud

https://www.miataturbo.net/attachmen...ine=1339180863

:rofl: yep

looks like he clamped too hard on some anal beads and straightened them out

my exhaust


louder IRL but reasonably quiet. 3" + big'ol 5x11x22 magnaflow. No cats :party:
free flowing enough to shed turbine wheels out of the exhaust.