Gutting upper vics manifold
02-20-2012, 02:46 AM
#1
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Gutting upper vics manifold
So i've been searching a lot on gutting the upper part of my vics manifold.
The plan is to remove the vics chamber on the upper manifold and leave the bottom one alone... leave the butterflys in tact and control them with my standalone.
So far i've seen people gut the bottom and completely remove the butterflys but no results in cutting the upper shelf. I see that pat is running with the top gutted but i havent seen any results. Any one else running with the top gutted and the butterflys still in tact?
If so at what rpm do you guys have them set to open?
Whats to be expected after gutting the top?
What method/tools did you guys use to cut the shelf?
The plan is to remove the vics chamber on the upper manifold and leave the bottom one alone... leave the butterflys in tact and control them with my standalone.
So far i've seen people gut the bottom and completely remove the butterflys but no results in cutting the upper shelf. I see that pat is running with the top gutted but i havent seen any results. Any one else running with the top gutted and the butterflys still in tact?
If so at what rpm do you guys have them set to open?
Whats to be expected after gutting the top?
What method/tools did you guys use to cut the shelf?
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02-20-2012, 08:25 PM
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So, today i went at it, got it done.
I feared the injectors wont do so i installed my 800cc injectors. Went in boost and afr went in the mid 10s... I removed some fuel but didnt test it, after restart the bloody wideband is fouled and is all over the place so i couldnt test anything. I guess i'll have to get a new one.
I feared the injectors wont do so i installed my 800cc injectors. Went in boost and afr went in the mid 10s... I removed some fuel but didnt test it, after restart the bloody wideband is fouled and is all over the place so i couldnt test anything. I guess i'll have to get a new one.
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02-20-2012, 08:41 PM
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i have a rough photo right after i pulled the center piece, I don't have the required tools to clean it up all the way too the wall so i had to round it off and leave it sticking out a little bit. I'll upload it in a sec.
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02-20-2012, 08:49 PM
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Damn pic is dark but you can see i used a drill bit to get rid of the center piece and then used grinding wheels for my hand drill to make whats left of the shelf smaller. Dont have a good pic of the finished manifold.
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02-20-2012, 08:59 PM
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So what your basically saying is, if I had a machinist actually remove that stuff and polish the inside of the intake; it would work pretty awesome.
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02-20-2012, 09:07 PM
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that must have taken forever... i used a hammer and chisel to bust a hole and used a sawz all to make the long cuts. i did end up using a carbide cutter on a power drill for the smoothing though. youre lucky... the miata vics looks much smaller than the protege vics i cut up...
were you planning on removing the 4 rings left on the top and hollowing out the lower section?
before
after
before
after
were you planning on removing the 4 rings left on the top and hollowing out the lower section?
before
after
before
after
Last edited by fastivab6tg25mr; 02-20-2012 at 09:18 PM.
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02-20-2012, 10:03 PM
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I used a dremmel but it didn't work too well and my rotary saw was too big. Long story short, i should have had an endmill or something similar.
Festiva, i do not plan on cutting anything on the lower manifold. My vics butterflys are still in tact and are set to open at 5k rpm. Sadly cant try it out since that damn sensor...
Festiva, i do not plan on cutting anything on the lower manifold. My vics butterflys are still in tact and are set to open at 5k rpm. Sadly cant try it out since that damn sensor...
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02-21-2012, 01:44 AM
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will the butterflies effect anything with that upper chamber hollowed out? i ask cause the runners look like they would be so close to the same size it doesnt look like there would be much gain in actuating the flappers. at least thats what im seeing by this pic. id love to see some numbers.
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02-21-2012, 01:52 AM
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When the butterflies are closed, its just like it was before however now that space contributes to a bigger plenum, with the butterflies open, it gives you a shorter runner for the higher rpms.
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02-22-2012, 05:36 PM
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Alrighty my new wideband is in, i shall do few pulls later. Old sensor looks...black so i'm guessing its salvageable if i can find a propane tank to burn off the carbon build up. Anyone ever cut one of these sensors apart?
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03-10-2012, 11:30 AM
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What happened? It looks like you made a significant amount of more torque at lower RPM's, unless I'm not seeing this correctly.
I ask because I have my spare intake apart in my garage and I am looking to gut this thing, only if there is a proven benefit.
What RPM does your actuator open? Please explain how you did your pulls...was it completed closed for one pull and completely open for another?
I ask because I have my spare intake apart in my garage and I am looking to gut this thing, only if there is a proven benefit.
What RPM does your actuator open? Please explain how you did your pulls...was it completed closed for one pull and completely open for another?
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