Ant1
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CT20b on gen 2 3SGTE
So since my CT26 is rooted I am looking to get a CT20b as an upgrade. Just wanted to know is there anything I would need or do for the conversion like the down pipe or so? Or is it a straight bolt on? Also if anyone has any tips on doing it that would be great.
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dylmrt
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Re:CT20b on gen 2 3SGTE
2012/12/24 00:15:13
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☄ Helpful
Its straight bolt on. dump is the same except you'll be missing one of the bolt/mount holes which is no biggie.
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MR PLOW
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Re:CT20b on gen 2 3SGTE
2012/12/24 08:21:27
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Hey Ant1. If you're planning on upgrading the dump pipe some time anyway, having the turbo out makes this a good chance.
Other than that, make sure you watch those AFRs once you're done. Just got a hi-flowed ct26 into mine and between it and the new exhaust, found its able to flow way more air than my gen2 fuel system can match, so it could run way too lean if I overdid the boost. 16psi is my safe limit but there is much more boost available (which will be handy when the ECU and fuel system gets upgraded). Check my showroom thread for the dyno chart and you'll see what I mean.
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cogs
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Re:CT20b on gen 2 3SGTE
2012/12/24 08:41:06
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It's not quite a straight bolt on, there's a few minor differences. I posted a thread with several photos showing the differences when I did the same conversion, but I can't find it on the new forum. Here's a link to the thread on the old forum, but the photos aren't showing up :( Edit: Admin has now fixed the photos http://www.mr2australia.c...rue&TOPIC_ID=21150 Regarding the conversion, it's well worth it - practically no difference in initial spool, but solid boost right to the redline. You'll also need a boost controller of some sort otherwise you'll only get the same boost as the CT26 (around 10psi) if you use the gen2 boost control system, and of course an FCD so the ECU doesn't stop the fun at 12.8psi!! I have been running mine at 16psi for a couple of years with no issue, using the EBC and FCD functions of a MAP-ECU2.
post edited by cogs - 2012/12/24 09:16:52
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Ant1
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Re:CT20b on gen 2 3SGTE
2012/12/24 13:12:36
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Thanks for the tip, will keep that in mind. Thanks, I'll have a look now. I have an Apexi Type R boost controller (that I havn't fiddled around with much yet), an aftermarket ecu (so I wouldn't need the fcd, just a tune maybe?) and a fuel regulator (which I also havn't fiddled with and don't know how to lol). Would a CT20b be good to hold as much power as a CT26?
post edited by Ant1 - 2012/12/24 13:25:31
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MCT_MR2
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Re:CT20b on gen 2 3SGTE
2012/12/24 13:52:11
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ct20b flows slightly more than at ct26 and can hold higher boost levels due to a steel exhaust wheel, instead of the ceramic wheel on a ct26 Ant1
'88 MR2 4AGTE W/ EFR6258 224.6KW @ 20PSI more to come......
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Ant1
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Re:CT20b on gen 2 3SGTE
2012/12/24 13:55:49
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MRTurbo
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Re:CT20b on gen 2 3SGTE
2012/12/24 16:12:22
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MCT_MR2
ct20b flows slightly more than at ct26 and can hold higher boost levels due to a steel exhaust wheel, instead of the ceramic wheel on a ct26 Ant1
so there were no ceramic wheeled CT20bs?? I thought the JDM ones were still ceramic.
1990 SW20 GT 3S-GTE Targa 2001 Honda CBR600F4i 
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just_ace
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Re:CT20b on gen 2 3SGTE
2012/12/24 16:28:29
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Ct20b have a ceramic wheel also. Only the grpA/Wrc 205 had a steel turbine.
Short answer, it's just a better/newer design, it flows more than a ct26.
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MRTurbo
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Re:CT20b on gen 2 3SGTE
2012/12/24 16:37:24
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thanks ace, I thought that was the case.
I'll be looking at this upgrade next year also :)
1990 SW20 GT 3S-GTE Targa 2001 Honda CBR600F4i
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MCT_MR2
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Re:CT20b on gen 2 3SGTE
2012/12/24 17:51:31
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MRTurbo
MCT_MR2
ct20b flows slightly more than at ct26 and can hold higher boost levels due to a steel exhaust wheel, instead of the ceramic wheel on a ct26 Ant1
so there were no ceramic wheeled CT20bs?? I thought the JDM ones were still ceramic.
Sorry mate, i wasn't aware of the ceramic wheeled ones, i have only seen/handled steel wheeled models.
'88 MR2 4AGTE W/ EFR6258 224.6KW @ 20PSI more to come......
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just_ace
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Re:CT20b on gen 2 3SGTE
2012/12/24 18:54:35
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Yeh, so only 2500 steel ct20bs,
adm and grpA/CS st185s also got steel turbine 26s and a different comp wheel.
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Ant1
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Re:CT20b on gen 2 3SGTE
2012/12/24 19:55:21
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That thread Cogs mentioned pretty much solves any problem I will have whilst doing the conversion. Thanks again mate.
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Ant1
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Re:CT20b on gen 2 3SGTE
2012/12/29 19:49:02
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So I am in the middle of putting the CT20b on and I noticed that the down pipe has the 7th hole to bolt the turbo on. Does that mean that the down pipe is off a gen 3?
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artymr2
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Re:CT20b on gen 2 3SGTE
2012/12/29 20:23:02
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CT20 has one more stud/bolt than CT26 on the dump interface.
Cheers
Black SW20 GT Turbo T-top 
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