20b on a Gen3 2.2l Stroker - MR2 Owners Club Message Board
 
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post #1 of 9 (permalink) Old January 6th, 2017, 13:03 Thread Starter
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20b on a Gen3 2.2l Stroker

Hello Folks,

Thinking about running a 20b on a gen3 2.2l stroker with 268 cams. I'm worried about boost creep. In your experience and understanding, will this be an issue?

If so, what are some options to rectify any problems?

Thanks in advance!

Pertinent information:
-Fuel 800cc side feed injectors
-PowerFC Standalone
-No porting done on the turbo and running OEM actuator


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post #2 of 9 (permalink) Old January 6th, 2017, 13:10
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I never had boost creep issues with my CT27 on a 2.2l stroker. If anything above 5-6k boost might fall off a bit. If your planning on running 17psi ish... mine did.
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post #3 of 9 (permalink) Old January 6th, 2017, 13:45 Thread Starter
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I never had boost creep issues with my CT27 on a 2.2l stroker. If anything above 5-6k boost might fall off a bit. If your planning on running 17psi ish... mine did.
The 20b held 19psi on a stock gen3, so I hope to be able to hold that much. I'm also considering upgrading the actuator to a Tial or Forge adjustable unit in order to hold higher boost levels.


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post #4 of 9 (permalink) Old January 8th, 2017, 20:50
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Boost creep issues seem to be on a case by case thing from what I read. I know personally when ever I have had creep it has been from an actual boost leak that would only come out under high load. As you know already these cars love to act funny when everything isn't perfect.

What block are you going with for the 2.2?
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post #5 of 9 (permalink) Old January 8th, 2017, 21:44
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Unless you are swapping out the Ct20b internals I'd expect it to run out of puff very early on and never reach 19psi. Doubt if you will have any boost creep as it won't reach your intended power levels.

jim
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post #6 of 9 (permalink) Old January 9th, 2017, 12:01 Thread Starter
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Thanks for the help guys.

I too am worried about not being able to hit 19psi, but hopefully a new actuator will remedy that issue.


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post #7 of 9 (permalink) Old January 9th, 2017, 12:33
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Doubt it as actuator simply controls wastegste to bleed pressure off.

Jim
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post #8 of 9 (permalink) Old January 19th, 2017, 09:17
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Im pushing 22psi from a stock ct20b into my 5SGTE.
Peak pressure is at about 5000rpm, then drops off down to redline (7600rpm).

Peak power figures arent huge, ~310hp at the wheel (its a GT Celica), but the response and low end are brilliant.
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post #9 of 9 (permalink) Old January 23rd, 2017, 07:22 Thread Starter
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Im pushing 22psi from a stock ct20b into my 5SGTE.
Peak pressure is at about 5000rpm, then drops off down to redline (7600rpm).

Peak power figures arent huge, ~310hp at the wheel (its a GT Celica), but the response and low end are brilliant.
What cams are you using? And do you have a dyno chart? I'd love to see how much area is under the curve.


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