DIY Turbo Discussion greddy on a 1.8? homebrew kit?
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View Poll Results: Which manifold would you choose if you were in my situation?
ETD Shorty Tubular
21.43%
BEGi S5
42.86%
FM manifold
0
0%
Other (post below)
35.71%
Voters: 14. You may not vote on this poll

Manifold advisers post up.

 
Old 05-22-2008, 02:34 PM
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Default Manifold advisers post up.

I need a T25 flanged manifold with an external gate for a 1.8L Miata. I've been raking this over the coals for awhile now and it's time for some outside advice.

I am torn between a BEGi or FM cast manifold with an external gate added on, or an ETD shorty tubular. I am working in a fab shop so I am not concerned about the availability of downpipe & IC piping.

Which would you guys run?


GOALS:
My turbo is a GT3071R with 0.61 A/R , external gated, T25 exhaust housing.

Initially I will run it in the 250-300 range on a stock 99 engine while I build up a forged short block. After that I'll bump it up to 300-350 and see where the power bug takes me.
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Old 05-22-2008, 02:42 PM
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out of the three I'd go with the shorty.
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Old 05-22-2008, 02:44 PM
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I am working in a fab shop
Why don't you make your own?
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Old 05-22-2008, 02:52 PM
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Originally Posted by Zabac View Post
Why don't you make your own?
+1 buy flanges and make it yourself you'll save plenty of $$$ that you can spend on other parts (MSPNP, intercooler)
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Old 05-22-2008, 02:55 PM
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yeah what they said. Make your own #1.

Buy one of mine #2.

Buy the ETD shorty #3.

BEGI or FM cast mani #4.
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Old 05-22-2008, 02:58 PM
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Get the cheapest, they will all work equally well.
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Old 05-22-2008, 03:04 PM
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I'd put Tim's over the shorty.
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Old 05-22-2008, 03:09 PM
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why go buy the cow when you can look at the butcher's *** by sticking your head in there?
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Old 05-22-2008, 03:17 PM
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huh?

Originally Posted by Braineack View Post
I'd put Tim's over the shorty.
Thanks Scott, but my mani not the cheapest unless you buy it with my GT2871R, in which case it's very cheap.
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Old 05-22-2008, 03:18 PM
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Why a T25 flange when you are going EWG? I'd do a T3 housing.
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Originally Posted by codrus View Post
Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
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Old 05-22-2008, 04:03 PM
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hey check this out i can help you with the manifold you want
https://www.miataturbo.net/forum/showthread.php?t=20270
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Old 05-22-2008, 06:22 PM
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Originally Posted by Zabac View Post
I am working in a fab shop
Why don't you make your own?
Sorry that was mis-leading. I work FOR a fab shop, part-time, on the business side.

Originally Posted by Dark Wanderer View Post
+1 buy flanges and make it yourself you'll save plenty of $$$ that you can spend on other parts (MSPNP, intercooler)
I can't weld.

Also, I prefer a tried and true manifold that doesn't suffer from boost creep issues, isn't likely to crack, and is easily replaceable if it does.

Originally Posted by TurboTim View Post
...Buy one of mine #2...
I like your manifold, but I love A/C and powersteeing more.



Originally Posted by Savington View Post
Why a T25 flange when you are going EWG? I'd do a T3 housing.
Spool and A/R selection.

My housing is T25 external wastegate housing from HKS. They have a whole slew of A/Rs for this turbine with the same footprint, so I can experiment/upgrade with out springing for a new manifold/downpipe/IC piping etc.

The T3 housings from Garrett have only one usable A/R for 0.63, and the T3 Flange is oversized for the 0.63 scroll anyway.

Last edited by MazDilla; 05-22-2008 at 06:47 PM.
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Old 05-22-2008, 06:31 PM
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you work on the business side... then offer your car up as a mock up mule to develop a new product. get them to make the manifold for nothing and then they can sell them once they have a jig made up.

seems like the cheapest, easiest solution to me.
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Old 05-22-2008, 06:42 PM
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Whoa that's scary I was just looking at your flanges on HMT.

I will talk to the main fab guy at the shop, but they want way too much money for the manifolds they build esp for what you get. Corky's stuff is a way better deal.
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Old 05-22-2008, 06:43 PM
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Who cares how much they want, your's will be free.
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Old 05-23-2008, 08:19 AM
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Originally Posted by MazDilla View Post

Originally Posted by TurboTim
...Buy one of mine #2...

I like your manifold, but I love A/C and powersteeing more.
yeah me too. I will never get rid of my P/S or A/C. I actually never tried fitting Paul's manifold with either of those, I just assumed it wouldn't work. Either way I'm going to do one for A/C and P/S soon; doesn't help you much now though. I guess I'd go with the ETD one then.
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Old 05-23-2008, 08:22 AM
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i'm selling custom mani's you'll get your monies worth..he he
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Old 05-23-2008, 09:28 AM
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Originally Posted by TurboTim View Post
huh?
It was a quote from Tommy Boy.
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Old 05-23-2008, 11:36 AM
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ahh alright, I missed that.
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Old 05-31-2008, 02:38 PM
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Originally Posted by mx03tb View Post
i'm selling custom mani's you'll get your monies worth..he he
just dont use his BOV, your piston will turn sideways in the bore
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