Removing butterflies

[98SF19]

Is there a write-up for this, specifically removing the butterfly shaft along with the 2 springs and connecting hardware on rear side (driver's side) of motor? I'm hoping to get into it when the heat breaks and want to be prepared for any pitfalls and with the necessary tools.
Thanks

 

[stephen newberg]

I seem to recall a number of posts by someone that did it, but I do not remember who. You will need to search around. Most simply wire the butterflies open and do not go to the extra effort of removing them and then having to deal with the resulting openings for their axles.

pax, smn

 

[98SF19]

Got em wired open now but it seems only to serve as an intercepter for oil/moisture, accumulating over time. All the recent discussion on improving air flow has me wanting to do the same. I intend on setting up a better catch can too. I haven't changed my pcv valve in forever! Is the sealing of the shaft holes a pita? I'll dig around and will hopefully find the posts you mention.

 

[GEN 3 SHO FAN]

Keep us informed. Sometime the infos are spread into 10 different threads and diluated. It useful to have it clearly identified and all in one place too.

Have a good day,

 

[98SF19]

Yes. I'm not looking for anything very detailed, just an overview of anything learned from the experience of already having done it.

 

[Devin]

What is the end result of removing the butterflies?

 

[stephen newberg]

Smoother air flow for the intake and a less complicated overall air system.

pax, smn

 

[GEN 3 SHO FAN]

Some say a little bit rough idle however.

 

[98SF19]

rough idle

I haven't heard of this, but then again, I haven't heard of much (or else I wouldn't have posted!). I'm guessing there were other issues going on with the rough idle. But even if there's a correlation, I'll take a rough idle any day to get a bit more pop at WOT out of this dirty dog.

 

[Devin]

Hmm, must have a significantly different induction setup from the earlier gens then. Interesting.

 

[stephen newberg]

No rough idle problems. Wiring the secondaries open to deal with problems with the IRMC has been a common fix for many years now with no known problems. Never heard of any idle problems due to it.

Devin, yes, the induction setup is in fact significantly different from that of the Gen I/II.

pax, smn

 

[GEN 3 SHO FAN]

Bah, I rode that like 2 or 3 times but in fact you will have rough idle with many other insignifiant things, like oil on plug well... As I don't have any other precisions on these posts, it's better to listen a veteran owner like Mr Newberg.

 

[gamefanatic]

When taking my SHO apart I found more oil on the valves where the butterflies were at. This is likely due to the suction being created and the valve bodies not being opened. Having them open even a little bit would reduce this addition suction and wear.

I am not sure why would have rough idle from this mod, unless they didn't plug the holes where the valve shafts were at if they took them out. If one only removed the oval shutters there should be no difference in the amount of air available for the engine than with them installed. Assuming there are no other ways for air to get in, idle should be a factor of your idle air control as the throttle body wouldn't be open in most cases. But maybe I am missing something on that case...

 

[98SF19]

If one only removed the oval shutters there should be no difference in the amount of air available for the engine than with them installed

I'd agree with this if you said no "significant' difference, but the downward profile of the intake at that point, even with butterflies maxed to open, would no doubt break up whatever vortex might be created without them (I do understand the cross-section is not circular for nearly the entire intake).
Some wouldn't feel the work needed for removal would be worth the gain, but with these cars, you gotta get every bit you can out of them since there wasn't a whole lot to start with!

 

[gamefanatic]

98SF19: I was only referring to idle, not during drive. I'm sure you would agree at idle there isn't enough air flow (CFM) coming through an IAC to be concerned about vortex or other options.

 

[dohcsho]

https://www.facebook.com/photo.php?...867261.-2207520000.1474246030.&type=3&theater
I remove the butterfly here is a long time and I saw a good improvement in the middle and upper range. + polished entire intake give me quick throtle response but is a long job lol !

 

[98SF19]

Any way you can upload pics outside of Facebook?

 

[gamefanatic]

Unfortunately those pictures do not show the butterflies / lower intake... Though I must commend you on the blacking out of the parts. Very nice, and probably wont show the oil stains as much as the stock or lighter colors!