Toyspeed.org.nz Message Board

by **Skin** » Tue Jan 31, 2006 8:52 pm

ok ive got a turbo from a gtt caldina that i was going to use on a mates st185 celica. now i originally thought it would be the same as a st205 and be a ct20b. However i recently got told that it might be a ct26. so with that in mind i removed the main part of the ct26 from the st185, just leaving the exhaust housing on the car. Upon comparison however the exhaust sides of both turbos are very different. The ct26 exhaust turbine is about 4 and 8mm bigger on the inducer and exducer, respectively. Also the gtt turbo appears to have a steel exhaust wheel,which i thought only the wrc st205's had. Anyway im a bit confuzzled as to what to do next. Whether to get a st205's exhaust housing and see if will mate up, or something else. any light on this situation would be most helpful.

Cheers
Mark

OMG so shiny! · by **Dell'Orto** » Tue Jan 31, 2006 9:04 pm

Some people call it a CT15a :lol:

I dont think its common enough to have a nickname like the CT20b. It wont fit unless you change the exhaust housing, being integrated into the manifold and all.

by **Adydas** » Tue Jan 31, 2006 9:08 pm

i thought it was a CT26 with manifold built into the Exhast side of the turbo?

by **Skin** » Tue Jan 31, 2006 9:08 pm

haha i know that brad, the original plan was to get a st205's exhaust housing and mate it up the caldina turbo, and then attach that to the st185's exhaust manifold and downpipe in the usual fashion...

the thing is will it fit into a st205's one? does anyone happen to have any measurements on the exhaust wheel off a ct20b? that could answer a few questions there.

by **Skin** » Tue Jan 31, 2006 9:10 pm

Adydas wrote:i thought it was a CT26 with manifold built into the Exhast side of the turbo?

nope thats what i had heard as well, but this turbo is completely different.

by **Adydas** » Tue Jan 31, 2006 9:10 pm

I mesured my ct26 vs ct20b and found no difference on sizes on that side that i was aware of * unless were talking mm *

OMG so shiny! · by **Dell'Orto** » Tue Jan 31, 2006 9:10 pm

Just get a CT20b, save stuffing around

Or get a rotor, something like that...

by **Steve123** » Tue Jan 31, 2006 9:17 pm

GTT turbo has dowels matching the rotation of the core to the exhaust. Never seen a CT20B appart but id say it wont be a direct fit.

by **Skin** » Tue Jan 31, 2006 9:52 pm

heres a pic of the turbos side by side, caldina one on the left

and a st205 ct20b has that dowel as well...

by **fivebob** » Tue Jan 31, 2006 10:12 pm

Mmm, Boost wrote:Some people call it a CT15a I dont think its common enough to have a nickname like the CT20b. It wont fit unless you change the exhaust housing, being integrated into the manifold and all.

If you're going to use a made up name get it right :lol:

by **fivebob** » Tue Jan 31, 2006 10:19 pm

CT15b, as it shall henceforth be known (though I'm sure Warwick can supply a part number for accurate reference :lol:

), is a single entry turbo and the exhaust housing is somewhat reminiscent of the Supra CT26, but it just a family resemblance they are not the same in many respects.

by **Skin** » Tue Jan 31, 2006 10:22 pm

ah yes i forgot to mention that, one of the first things i noticed when i first got it was that it was single entry....

OMG so shiny! · by **Dell'Orto** » Tue Jan 31, 2006 10:31 pm

fivebob wrote:If you're going to use a made up name get it right

Doh, close enough for me anyway

Only a 5 bolt exhaust flange too?

by **Skin** » Tue Jan 31, 2006 10:34 pm

no that pic must be of the supra housing, as the caldina one is 6 stud and you can see in that pic its just the housing, not the stupid housing/manifold one piece abomination...

by **fivebob** » Tue Jan 31, 2006 10:58 pm

Skin wrote:no that pic must be of the supra housing, as the caldina one is 6 stud and you can see in that pic its just the housing, not the stupid housing/manifold one piece abomination...

Oops, it's not even that, it maybe the exhaust of the other turbo known as the CT15b, from the late model 1JZ if IIRC. Can't find where I got that pic from although it originally came from EBay judging by the watermark.

by **fivebob** » Tue Jan 31, 2006 11:01 pm

CT26(MR2/ST185 Variant) on the left , CT15b (Caldina variant) on the right.

by **Mr Revhead** » Tue Jan 31, 2006 11:16 pm

hey those silly turbo/manifold things are doing us quite nicely thank you very much. but yes, silly design! facelift version fixes the manifold problem though.

by **Skin** » Tue Jan 31, 2006 11:20 pm

haha ill bet they are, if you stuff the manifold you have to buy the whole turbo setup, which is exactly how i got this turbo for nothing in the first place

by **strx7** » Wed Feb 01, 2006 1:50 pm

I have a good condition 2nd hand manifold if anyone needs one (GT-T)

by **Wildcard** » Wed Feb 01, 2006 2:18 pm

Mr Revhead wrote:hey those silly turbo/manifold things are doing us quite nicely thank you very much. but yes, silly design! facelift version fixes the manifold problem though.

Whats the problem with them? How did they fix them in the facelift?

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caldina gtt turbo:just what the hell is it exactly?....

caldina gtt turbo:just what the hell is it exactly?....

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