TB mod
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i play with my wankel
Joined: Jul 2005
Posts: 1,630
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From: North Manchester, Indiana
TB mod
so i got a link off my buddy for the TB mod even though its for a 2nd gen but is it pretty much the same..... heres the link http://www.fc3spro.com/TECH/HOWTO/TBM/tbm.html
i also read this that is stated in the link "The downside is engine speeds under 3,000RPM will cause hesitations if aburpt throttle inputs are made; you cannot romp the throttle if the engine is revving under 3,000RPM. If you do, you will be rewarded with a slight bog, as the intake velocity is not fast enough to handle such a large transition in the throttle body due to the removal of the extra set of throttle plates. One of the purposes of the extra throttle plates was to provide progressive transition of intake velocities when romping on the throttle at such low engine RPM speeds. On a good note, if you avoid this problem by driving smoother with the throttle input, you are learning to be a better driver! " so is the TB mod worth doing???? thx
i also read this that is stated in the link "The downside is engine speeds under 3,000RPM will cause hesitations if aburpt throttle inputs are made; you cannot romp the throttle if the engine is revving under 3,000RPM. If you do, you will be rewarded with a slight bog, as the intake velocity is not fast enough to handle such a large transition in the throttle body due to the removal of the extra set of throttle plates. One of the purposes of the extra throttle plates was to provide progressive transition of intake velocities when romping on the throttle at such low engine RPM speeds. On a good note, if you avoid this problem by driving smoother with the throttle input, you are learning to be a better driver! " so is the TB mod worth doing???? thx
Not on an NA imho. I did it on my 2nd gen, got so tired of not having a cold start warm-up cycle, I found another stock one to put back on. Works great on the TII's, which it was deisigned for, not the NAs.
FB+FC=F-ME
Joined: Jul 2004
Posts: 3,353
Likes: 5
From: Rohnert Park CA
I havent run secondary/secondary butterflies for years and Ive never experienced any bogging.....
The main throttle butterflies are progressive,meaning the center plate opens before the secondaries.That should take care of lowend bogging for the most part.From what I understand,the primary purpose of the secondary/secondary butterflies is to keep the secondary runners from flowing air when the engine is cold.....hence,they are plumbed/actuated by a thermal regulated dashpot.When the engine is cold,the butterflies stay closed and prevent cold engine/high throttle abuse.Once the coolant comes up to temp,the butterflies open and the main plates furthur down handle the airflow.
I deleted the entire system with its dashpot,and the cold start bypass solenoid on top of the intake.I did keep the coolant controlled thermalwax plunger for a high cold idle and I still get a regular idle warmup sequence.The RPMS hit about 2200 at startup,drops to about 1500 for a few minutes,then drop to a nice 800 RPM warm idle.
The main throttle butterflies are progressive,meaning the center plate opens before the secondaries.That should take care of lowend bogging for the most part.From what I understand,the primary purpose of the secondary/secondary butterflies is to keep the secondary runners from flowing air when the engine is cold.....hence,they are plumbed/actuated by a thermal regulated dashpot.When the engine is cold,the butterflies stay closed and prevent cold engine/high throttle abuse.Once the coolant comes up to temp,the butterflies open and the main plates furthur down handle the airflow.
I deleted the entire system with its dashpot,and the cold start bypass solenoid on top of the intake.I did keep the coolant controlled thermalwax plunger for a high cold idle and I still get a regular idle warmup sequence.The RPMS hit about 2200 at startup,drops to about 1500 for a few minutes,then drop to a nice 800 RPM warm idle.
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demetlaw
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Oct 2, 2015 06:22 PM