GEN4 with Stage1 CRW CT20b, 16.8psi boost, 3" exhaust, intake - MR2 Owners Club Message Board
 
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post #1 of 15 (permalink) Old May 12th, 2015, 19:38 Thread Starter
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GEN4 with Stage1 CRW CT20b, 16.8psi boost, 3" exhaust, intake

So i got a dyno run in last weekend after getting a freshly rebuilt ct20b stage 1 from CRW. My mods are as follows:

freshly rebuilt gen4 3sgte
tcs 4" intake
ebay sidemount intercooler
CRW Stage 1 CT20b at 16.8psi
3" TCS SP exhaust w/ test pipe

I touched 16.5 psi then it tapered down to 15.8psi.
A/F got to about 10.5 near redline

My Question is whats goin on at 5000rpm where torque drops and hp slows down???

here ya go!:
287.8hp and 273.3 lbft









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post #2 of 15 (permalink) Old May 12th, 2015, 19:43 Thread Starter
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Overall i like the turbo but i can't really compare it to stock because my old turbo had a cracked busted exhaust manifold and it was leaking oil. After getting it rebuilt and a new manifold thanks to Josh at CRW the thing spools louder, earlier and faster than before. I'm not running a blow off valve and i hear it CHuh Chuh Chuh Chuh all the time even when i barely tap the gas a bit.
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post #3 of 15 (permalink) Old May 12th, 2015, 19:56
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Very nice! Drop off after 5000 rpm looks pretty normal to me. Torque always drops off at high rpm ... my dyno looks really similar.
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post #4 of 15 (permalink) Old May 12th, 2015, 21:24
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if its chuh chuh ing under boost that is bad, if its when you let off its normal
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post #5 of 15 (permalink) Old May 12th, 2015, 23:23 Thread Starter
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no its chuh chuhing after letting off! normal!
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post #6 of 15 (permalink) Old May 13th, 2015, 12:45
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What's going on after 5000 rpm is a combination of your car's VE dropping off due to the stock cams and the pressure building in the exhaust manifold due to the turbine starting to become a restriction, also reducing VE. VE is volumetric efficiency, or how much air your engine moves through the car compared to how much it could under ideal circumstances.
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post #7 of 15 (permalink) Old May 13th, 2015, 12:49 Thread Starter
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Good info! What do you guys think I can do safely to get more power while still sticking with stock ecu?
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post #8 of 15 (permalink) Old May 13th, 2015, 13:07
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Those don't rums were on 91 octane?
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post #9 of 15 (permalink) Old May 13th, 2015, 19:06 Thread Starter
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what was your sentence? I was running on 91 octane.
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post #10 of 15 (permalink) Old May 13th, 2015, 19:36
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turn boost up another psi
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post #11 of 15 (permalink) Old May 13th, 2015, 20:08
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Sorry I was at work lol asked if those dyno runs were on 91 octane.. Thanks
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post #12 of 15 (permalink) Old May 14th, 2015, 10:07
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What kind of boost control do you have?? Congrats, must be a fun street car. enjoy it!
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post #13 of 15 (permalink) Old May 14th, 2015, 18:43 Thread Starter
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i just have a ball and spring manual boost controller....i would turn it up but once in a while it'll hit boost cut. so to stay on the safe side i set it at that lvl.
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post #14 of 15 (permalink) Old May 14th, 2015, 21:20
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eboost2 is your friend mine stays at 17.9 unless it gets real cold out
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post #15 of 15 (permalink) Old May 23rd, 2015, 02:29
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Quote:
Originally Posted by drake22 View Post
Very nice! Drop off after 5000 rpm looks pretty normal to me. Torque always drops off at high rpm ... my dyno looks really similar.
Drake, did you ever post your dyno? I don't think I've seen it anywhere...



Never mind...I found it.

Last edited by tonys92t; May 23rd, 2015 at 08:00.
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