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.

 

out of the three I'd go with the shorty.

 

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)

 

yeah what they said. Make your own #1.

Buy one of mine #2.

Buy the ETD shorty #3.

BEGI or FM cast mani #4.

 

Get the cheapest, they will all work equally well.

 

I'd put Tim's over the shorty.

 

why go buy the cow when you can look at the butcher's *** by sticking your head in there?

 

huh?

Thanks Scott, but my mani not the cheapest unless you buy it with my GT2871R, in which case it's very cheap.

 

Why a T25 flange when you are going EWG? I'd do a T3 housing.

 

hey check this out i can help you with the manifold you want
https://www.miataturbo.net/forum/showthread.php?t=20270

 

Sorry that was mis-leading. I work FOR a fab shop, part-time, on the business side.

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.

I like your manifold, but I love A/C and powersteeing more.



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.

 

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.

 

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.

 

Who cares how much they want, your's will be free.

 

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.

 

i'm selling custom mani's you'll get your monies worth..he he

 

It was a quote from Tommy Boy.

 

ahh alright, I missed that.

 

just dont use his BOV, your piston will turn sideways in the bore