2nd Generation Specific 1986-1992 Discussion

N/A TB vs T2 TB. N/A TB better airflow for T2s?!

Old 10-08-2011, 07:18 PM
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So what really is the difference between the n/a and t2 tbs?



well lets start off by stating that the t2 tb is basically an upside down n/a tb. besides the obvious position of the tps and throttle cable mount, there really isnt that much of a difference between the 2? WRONG



having an old ported n/a tb i decided to see if it could be some use to the t2. i carefully inspected both tbs and found out that the primary butter flies open in the opposite direction. the t2 primary butterflies open downwards while the upside down n/a open upwards. let me further elaborate.



text pics too lazy to use paint



diagram of airflow from tb to uim plenums



( ) = intake plenums

>^ = airflow

/ = n/a tb butterly in opening position

\ = t2 tb butterfly in opening position







n/a

( )

^

^

> /





t/2

( )

^

^

> \ turbulence?





it clearly shows that the way the butterflies open on the n/a tb primary side, the one winged butterfly side which is the one with only one hole in the tb, moves the air TOWARDS the intake plenums which means less restricion and better throttle response. the t2 tb, on the other hand, moves the air away from it and could cause some turbulence.



so why go through all the trouble modding the tb? because throttle response is king on a rotary!



will it work? whats your opinion? im still a noob at this rotary thing...



ive already searched this up and found nothing.
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Old 10-09-2011, 12:00 AM
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the pix arent allowed from 7club
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Old 10-09-2011, 05:12 PM
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what pics?
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Old 10-09-2011, 05:53 PM
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The images you linked.



I've got no experience with any TB except the stock one on my T2.
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Old 10-09-2011, 06:18 PM
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ok heres the t2 uim... see how the intake plenums go up meaning the air flows up?







here is the t2 tb. see how the top/primary hole opens downwards away from the intake plenum? wouldnt that cause slight wind turbulence?





now here is the n/a tb. the butterfly would cause the air to move upwards TOWARDS the plenums instead of downwards away from it.



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Old 10-09-2011, 07:03 PM
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At full throttle, the difference is negligible. At part throttle, you arent looking for max flow anyways. Doesnt look like much of an issue to me.
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