1.6L intercooler, pipe, size, routing
 

Just about to put the motor back in the car and intercooler routing has really been on my mind.

ARTech manifold/downpipe
SR20 T25
clocked going towards the bottom of the car (this was Curly's old setup)
I plan to tap the intercooler for the AIT sensor.

I want to keep the pipe size as small as I can, mostly for fitment and maybe less overall volume to pressurize (although this is minuscule at best).

I just did a DIY coolant reroute so I have some room to play with. Here is what I am thinking, and I would love some feedback from those that have done this or those that have found flaws when routing theirs.



2.75" to 2.0" 90* reducing elbow. (throttle body)
Silicon port system with 90* bend 1/2" NPT to 3/4" barb
https://www.miataturbo.net/attachmen...ine=1448036307

27" x 5.5" x 2.5" intercooler
https://www.miataturbo.net/attachmen...ine=1448036307

Universal 2" Intercooler piping kit
https://www.miataturbo.net/attachmen...ine=1448036307

Two 2" to 2.5" couplers for intercooler
https://www.miataturbo.net/attachmen...ine=1448036307

Various sized T-bolt clamps.
https://www.miataturbo.net/attachmen...ine=1448036307

Any down sides to this list? This is a pretty budget build and I plan on doing a build thread on it once I have all everything in and running. I just put this video together on how to depower your NA steering rack and I have a small blip near the end about my turbo install.

https://www.miataturbo.net/diy-turbo...tercool-83180/

Video of my routing.

hi_im_sean has good pictures too.

Don't buy a kit. Buy individual pieces.

2x45* pipe
2x90* silicon coupler

This will drop the end of your pipe right under the throttle body inlet and right around the steering rack on the hotside.

Then a 90* coupler on the coldside and a straight piece up to the throttle body, with another 90* coupler.

The hotside depends on where your turbo is mounted.

Your video link is wrong.

Edit: build a bead roller. http://www.d-series.org/forums/diy-f...ad-roller.html

Yeah, I am sub'd to Sean's build and I have seen your video before. The only thing I don't like about your IC routing is how many couplers you have. I was wanting to use 4 total if I can.

I also don't really like that way of bead rolling. It's not bad, but it's really inconsistent. Here is how I will end up rolling any pipe I cut. Thanks for the other links though.

Can you weld aluminum? Otherwise you will have couplers.

Also, is there anything wrong with couplers?

Also, that looks a lot more inconsistent. Its the same as the one I posted, but does less at once.

No, but I have a local radiator shop that said they could run a few beads for me. They rewelded my mixing manifold after clocking it 45* to clear the compressor inlet and drain line.

I feel like couplers introduce a point of failure and/or boost leaks.

I have tried the one you posted before on a friends Civic build. We got inconsistent amounts of bending since the radius of the washer would make a much tighter bend in the aluminum, it gave us a weird shape on the tube opening as well. The one I linked doesn't "shrink" the metal around it so you get a straight line from the opening and past the bead you press in, but it is time consuming. They both probably accomplish the same thing but the one I linked looks much cleaner on the finished product.

Edit: I see they used an exhaust clamp on the bottom to keep the sides from bending too much. We did not do that which is why ours shrank the metal in at the ends. If I get rushed for time I will probably use this method.

Ahh, well if you can do that then swap my 2 90 degree couplers for 90* pipe and you are good to go.

I like couplers because they allow the engine to move and not stress any pipes. A properly bead rolled pipe with coupler will not blow off.

I used a washer that was almost the size of the pipe, so that probably helped. My tubes are perfectly round afterwards though, pick your poison. To me those beads don't look big enough.

We borrowed a real bead roller last time I bead rolled something, it was so much better.

I don't think it can get any simpler and cleaner than the aidan/sean routing, especially when your compressor outlet points in the same direction as mine. And, like aidan said, don't buy the tubing kit, youll toss 80% of it. All I needed was x2 45's, and maybe a foot of straight section along with the BOV adapter pipe. I think your concern with the sili couplers is unfounded, but if you want to cut down on them, you can do the "hornetball" couplers. Have you seen his build, I think the newer one, not the red car? very clean, nice way of eliminating sili couplers.

Now that I can "weld aluminum" I have considered buying some 90's and swapping to more welded joints, but I can't be bothered because the couplers seem to work so well.

I have gotten rid of one of my straight couplers, and will be getting rid of the other soon.

here ya go
https://www.miataturbo.net/build-thr...0/#post1252415

one can also, and has used, epoxy instead of brazing with similar success

edit- better linky

I'll check out Hornetballs build. I think I have only read though his red car build.

Thanks for the input.

Edit: Oh man, he brazed them. That's a great idea, and it give me an excuse to get some MAPP gas!

On 2nd thought, his routing is pretty kick ass too. If you want to reclock the turbo again so it points to the side, you could copy that as well.

His is longer, not by much though. Also more work, bends I believe.

I really need to look into Hornetballs routing and see if I can easily adapt it to my MKTurbo setups.

He had some leaks with smelting the metal together. I have smelted copper before but nothing close to ~2" ID.

aidandj, did you find a longer pipe with a BOV flange on it anywhere? I would like to do a 90* off the throttle body into a straight pipe with BOV/BPV flange then run a 90* into the 45* pipe on the cold side.

I ditched my BOV. I have a bypass valve on the turbo.

I could probably be talked into welding a bov flange onto a pipe and sending it to you. No guarantees on prettyness. Or timelyness.

I would be more interested in doing a BPV on my setup as well. I am not all about the choo choo's. Anyway I could get a picture of your current setup?

Its built into the turbo

Not sure if anybody said this already, but dont use that blue coupler. Those non-reinforced silicone couplers always seem to turn hard and then tear.

The CXracing stuff is pretty nice. Good couplers, good T-bolt clamps, and the tubing is thick walled.

CXRacing actually makes some ok stuff.

I know of a pro level fab shop that gets all their aluminum piping from them.

Since I already have this thread going I want to ask about water routing. I am doing a reroute and put a freeze plug up front. I want to use the dreaded water plug in the rear to run off my IAC and then run the ISCV to the exit port of my turbo. The inlet water port to the turbo is where I am having some thoughts. There is a water plug right next to the oil plug on the block, but I never see anyone using it. Why does noone utilize this port? The one in red is oil, but right next to it is the one I mention

https://www.miataturbo.net/attachmen...ine=1448117283

It's only on 1.6 and 94 1.8 blocks. A far a I've seen, everyone with 90 to 94 blocks, including me, use that port...

Or maybe it was the oil port that only came on 90 to 94? My memory sucks. In any case, i use the water port there and so have lots of others.

I can't find anything in a M12 x 1.25 to barb. Where did you find your barb fitting?

Now that I think about it, some probably don't use it because the mixing mani and the front housing have nipples right there ready to go. No point in pulling a plug and ordering a fitting unless you are removing the front neck and or mixing mani like we have done.

I wanted a 90 degree fitting and couldn't find what I needed without stacking up like 3 fittings, so I made my own banjo fitting. I couldn't even find an M12 to 8mm banjo to barb, easily or cheaply anyway. I have some m12 banjo bolts from my Subaru that I found after I made my own bolt, and I can make you a banjo block fitting thing if you want.

https://www.miataturbo.net/build-thr...1/#post1251519


theres plenty of m12x1.25 to AN options though if you want to cobble that together somehow.
AN6 6AN JIC Flare to M12x1 25 Metric Straight Fuel Oil Fitting Adapter Blue | eBay

The Banjo bolt idea isn't bad, and I have thought about that too. I found a website that has the fitting in question and I ordered some. I kind of screwed up the order and got 8mm barb fittings which seem a bit small for my 3/8 ID slip fittings on my turbo. Not sure if that would cause a problem or not and the largest OD offered in the correct size is 10mm. I may just order these and try to recoup some of the cost by selling them to members on here for a few bucks shipped. Atleast until I break even with.

M12x1.25 to 10mm barb

I'm planning on using that water port on my 1.6L as well. I just ordered both of these, let's hope they fit:

JEGS Performance Products 110071, JEGS AN Push-Loc Hose End Fittings | JEGS Performance Products
Earl's AT991945, Earl's Ano-Tuff Carburetor Fittings | Earl's

Nice, good fallback if mine doesn't work. I have the same turbo fitting as that, but I still have no started the car yet so I am not sure how well it works. If you have some issues with that setup and want to try a barb that I have PM me. I'll send it to you for shipping.

The water hook up at the T-stat is just too easy.
corky

I mean, there is a freeze plug where my housing used to be. Cheap coolant reroute requires a bit more thought when keeping it cheap.

+1

Here's the 2.5" intercooler plumbing kit I bought:

https://www.miataturbo.net/attachmen...ine=1448420647
Aucxracing intercooler plumbing kit

Here's my coldside plumbing mocked up (I call this "The Cobra"):

https://www.miataturbo.net/attachmen...ine=1448420647
The Cobra!

- it connects my Fab9 350hp intercooler coldside to my Skunk2 TB.

So from the original plumbing kit I only used a J bend and a cut-down 90* bend. The couplers were of no use (probably could have used one of the straight ones) and I used better clamps.

Lol, The Cobra! I got most of the piping but no couplers yet. Damn holiday shipping time. :(