Secondary manifold butterflies...

[Bwana]

I did some searching on this and pulled up a couple indefinitive threads ( zerothread?id=138059 for instance). Ryan, did you ever get around to testing the effects of closed vs. open on a dyno? Adjust them to open via the SDS? Scrap the project ??? I'm thinking I'll probably remove them but if there's evidence of a real gain by keeping them I will. If I do remove them, what's the best method?? Can I remove the plates only and leave the shaft (cheap/easy)? If I remove the shaft do I need to plug all the holes or only on the ends? Thanks guys!

[boost_boy]

I did some searching on this and pulled up a couple indefinitive threads ( zerothread?id=138059 for instance). Ryan, did you ever get around to testing the effects of closed vs. open on a dyno? Adjust them to open via the SDS? Scrap the project ??? I'm thinking I'll probably remove them but if there's evidence of a real gain by keeping them I will. If I do remove them, what's the best method?? Can I remove the plates only and leave the shaft (cheap/easy)? If I remove the shaft do I need to plug all the holes or only on the ends? Thanks guys!

Bro, I left mine in and the car screams like it has no discipline. They are not in the way, just don't put any vacuum on them.

Dee

[Bwana]

That's easy. Sounds like the way to go then... Figured now was the time do deal with it since I have the intake all apart!

[dvd]

dee- so you just left the vaccum open huh. maybe i should do that.

[ISL33P]

since you have it apart might as well pull them out and weld/plug the holes

[dattodude]

I know more about this.

On the dyno recently, the tuner couldn't improve on the factory opening RPM of 4000rpm. I configured my power valve to open on my Autronic SMC as the factory manual describes. With them permanently open, this put a big dent in the torque curve.

Use them if you can.

If you are a dyno-queen..then driveability and torque probably don't mean much.