st205 throttle body

Q&A regarding engines, turbos, and intercoolers and power upgrades

st205 throttle body

Postby ruffneck » Sat Jan 22, 2005 9:04 am

As I understand it, the st205 throttle body should be a straight swap onto the st185....anyone confirm this? Next question - anyone know where I can get one from...everwhere I've tried here only sells a complete front cut, if they have it at all...
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Postby Puffy » Sat Jan 22, 2005 12:09 pm

They are NOT interchangeable.

GT4 are 50mm and the Group A / CS are 55mm. This is a straight swap.

ST205's are 60mm and do not bolt up to the 185 intake manifold.
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Postby saved_1992 » Sat Jan 22, 2005 2:22 pm

confirmed that it does NOT fit
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Postby pog0 » Sat Jan 22, 2005 5:08 pm

Standard ST185 TB is 54mm.
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Postby Puffy » Sat Jan 22, 2005 8:13 pm

Australian and Jap spec butterflys that we measured were 50mm.
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Postby ruffneck » Sun Jan 23, 2005 5:56 am

yeah i'm pretty sure that mine is 50mm, and it's a jap import st185....so anyone know who sells a bigger throttle body for the st185 then?
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Postby saved_1992 » Sun Jan 23, 2005 5:21 pm

maybe you can tell us what you are trying to do. there are a couple different places that sell throttle inlets, not throttle body.
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Postby ruffneck » Mon Jan 24, 2005 4:04 am

Ok, if you have 2-1/4 or 2-1/2 inch intercooler piping, the 2 inch opening of the throttle body creates a bottleneck for air going into the plenum..I'm trying to get rid of that...BY ANY MEANS NECESSARY!..sorry got carried away, but yeah, that's basically it..a friend who runs drag cars pointed this out to me on the weekend while I was at his house..
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Postby BraveUlysses » Mon Jan 24, 2005 6:21 am

I would say its a restriction, but probably not a OMG HUGE one. Just step up to a ChrisK or RMR side-feed throttle body with a 75mm mustang TB. 8)
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Postby Gary » Mon Jan 24, 2005 6:26 am

If you decide to get a new manifold and larger TB, don't forget the center feed Hux manifold. Justin has it.
http://namobrut.tripod.com/id2.html
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Postby MATT-S » Fri Jan 28, 2005 6:28 pm

If you find a solution to this please let me know, because I have a 205 wrc charge cooler sitting in my garage that i'm desperate to fit up, but I don't particularly want to go from a 3" outlet straight down to a 2" inlet. There isn't enough room to make a custom smooth reduction pipe so it will be forcing boost int an inch of flat metal, not ideal.
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Postby CMS-GT4 » Fri Jan 28, 2005 6:36 pm

Bay area makes an adapter for a 205 IC to fit the 185 TB. Pretty good idea.

I think for everyone else, custom intake manifold, and using a mustang TB is the best choice for big power and fmic.
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Postby saved_1992 » Fri Jan 28, 2005 6:38 pm

MATT-S check this out,

http://www.gt4oc.net/viewtopic.php?t=24050&highlight=

and (the intercooler install)

http://www.alltrac.net/phpBB2/viewtopic.php?t=2136

the bottom one is my set up and i tell you what it made a HUGE difference in the performance of my car.

and if you use BayAreaAT adapter or the ATS you will be good to go
mike
omaha,ne
1988 work in progresss (205 assem w/tdo6/haltech)sold
1988 a driver (RED) sold
1992 the keeper (RED)
1993 sold to 2of81 (RED)
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Postby saved_1992 » Fri Jan 28, 2005 6:52 pm

personally i think unless you are running alot of horse power over 350-400 (maybe more) the "bottle neck" is negligable. the air is getting forced in not pulled in like a normally aspirated engine.

the ATS adapter claims to gain just 7 horse power on a modified engine and up to 20hp on a high hp engine.
mike
omaha,ne
1988 work in progresss (205 assem w/tdo6/haltech)sold
1988 a driver (RED) sold
1992 the keeper (RED)
1993 sold to 2of81 (RED)
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Postby MATT-S » Sat Jan 29, 2005 12:41 am

Good work Saved, that's brilliant. What mr2 is the rubber reducer thing off? is it the turbo? So all I need is one of those adapters some sealant and a reducer and i'm away!!!! Did you fit the 205 cc to the 165? If so I reckon it will make more of a difference with my 185 a/a interwarmer.
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