Turbo ?'s
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Joined: Jun 2003
Posts: 71
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The CT20b may not be it's real name, but to simplify things that's what it's refered to by the community.
The CT27 is more than just a clipped CT26 as slash pointed out. Not only does it offer the different choices in wheels, but the exhaust housing has also been made larger (while still retaining the twin scroll). The exhaust housing has long been thought to be the restriction with the CT26 and this proves it.
The 300hp dyno posted on MR2OC was not done with cams (he has cam gears, but they were still set to stock) but was done with an EMS and built block. MR2Driver's car does preform better than the above dyno, but remember, he has a 3rd Gen engine (big difference).
As far as which one is better, well you have to decide for yourself. The CT20 will spool faster due to the ceramic wheel (but this also brings up reliablilty issues with higher boost). The CT27 will make more HP at the same boost though. As far as costs go, you can get a CT20 for around $650 then you can sell your CT26 for around $200, making it around $450 to get a CT20. The CT27 will cost you $850 and you lose your CT26 so you can't resell it.
I personally decided to go with a CT20 and an Aussie 3" downpipe because if I wanted to spend over $1000 for a turbo and dp, I'd just build a kit.
The CT27 is more than just a clipped CT26 as slash pointed out. Not only does it offer the different choices in wheels, but the exhaust housing has also been made larger (while still retaining the twin scroll). The exhaust housing has long been thought to be the restriction with the CT26 and this proves it.
The 300hp dyno posted on MR2OC was not done with cams (he has cam gears, but they were still set to stock) but was done with an EMS and built block. MR2Driver's car does preform better than the above dyno, but remember, he has a 3rd Gen engine (big difference).
As far as which one is better, well you have to decide for yourself. The CT20 will spool faster due to the ceramic wheel (but this also brings up reliablilty issues with higher boost). The CT27 will make more HP at the same boost though. As far as costs go, you can get a CT20 for around $650 then you can sell your CT26 for around $200, making it around $450 to get a CT20. The CT27 will cost you $850 and you lose your CT26 so you can't resell it.
I personally decided to go with a CT20 and an Aussie 3" downpipe because if I wanted to spend over $1000 for a turbo and dp, I'd just build a kit.
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91 Toyota MR2 - 5VZ-FE 3.4L V6 with GT35R
91 Toyota MR2 - 5VZ-FE 3.4L V6 with GT35R
Registered User
Joined: Jan 2003
Posts: 172
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I have the 3rd gen turbo , way more efficient, holds 17-18 lbs to redline and like stated above 650$ will more than likely get you one with low use off a jdm motor. The ats turbo hasnt been around long enough to really get alot of feedback from different people with different cars ect.ect.
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Joined: Aug 2000
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Here is my dyno chart at 15-16psi. As you can see by my a/f I need some tuning. Thing I notice when you compare this with the one above is that the upgrade peaks power at 5k rpm, and the "ct20b" peaks power at 6200rpm. Seems like the ct20b is more effecient.
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Joined: Aug 2000
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Oh, and here is the stock ecu. Besides the ecu, the mods on these runs are intake, kinda restrictive exhaust, 2.5" downpipe, and boost controller. That is all. I am still running the stock ic, fuel system, and internals.
