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Old 10-12-2001, 11:39 PM   #1
the Dabbler
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Question Puzzled by Vortech FMU Full Recal Kit

I received my Vortech recal kit today. I ordered the one with all of the disks, because I wasn't entirely sure what I needed, and it was only $10 more anyway.

I'm a bit confused, though. The kit came with:

1 diaphragm
5 steel disks of various diameters
1 2.75" aluminum ring, with no notches or recesses
1 2.375" aluminum ring, notched and recessed on the same side
1 2" aluminum ring, notched on one side, and recessed on the other
1 2" aluminum ring, notched and recessed on the same side
1 set of general instructions, but nothing that answers my questions, below

I understand what to do with the diaphragm and the steel disks. But the various aluminum rings puzzle me. For one thing, some of them are recessed, some are not, some have notches, some don't, and only two of the disks fit into two of the rings.

Anyone care to shed any light on this?

Thanks
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Old 10-12-2001, 11:40 PM   #2
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Oh, and here's a pic, if that helps.
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Old 10-13-2001, 12:25 AM   #3
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i got that kit and you have everything. i dont really understand the problem but everythign fits properly. did they send you the instructions? you are supposed to put the rings (notch facing DOWN) around the 4(5?) bolts in the middle of the FMU-you see them when you open it up. the 12:1 (biggest disc) does not need a ring. the rest need them to keep in place. if you havent opened up the FMU yet then do so now and you will see and everything will make sense.

hope i helped some.



incase they didnt send you it im going to upload the pics from the piece of paper they gave me and you can see the diagram for yourself.

Last edited by Andrew; 10-13-2001 at 12:31 AM.
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Old 10-13-2001, 12:33 AM   #4
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Old 10-13-2001, 12:38 AM   #5
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Old 10-13-2001, 12:39 AM   #6
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i hope this helps
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Old 10-13-2001, 12:42 AM   #7
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i just read that you got the general instructions so ig uess that was just a waste


but the recessed part is for when you put it over the screws in the middle in the first pic. the reason why some dont have the recessed piece is because they fit around the screws and dont need to be recessed for the plate to fit on.
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Old 10-13-2001, 12:45 AM   #8
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and this is to anyone who is reading this... when you open up your FMU was there a spring and small round metal disk ontop of it right over the piece that says VORTECH on it? i cant remember where it goes but its the one with the single AN fitting and not the 2.


if i remember correctly its the vacuum fitting.
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Old 10-14-2001, 04:49 PM   #9
the Dabbler
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Quote:
Originally posted by Andrew
i got that kit and you have everything. i dont really understand the problem but everythign fits properly. did they send you the instructions? you are supposed to put the rings (notch facing DOWN) around the 4(5?) bolts in the middle of the FMU-you see them when you open it up. the 12:1 (biggest disc) does not need a ring. the rest need them to keep in place. if you havent opened up the FMU yet then do so now and you will see and everything will make sense.

hope i helped some.


incase they didnt send you it im going to upload the pics from the piece of paper they gave me and you can see the diagram for yourself.
Thanks.

As noted, only three of the four rings have notches. Also, only two of the recessed (and notched) rings fit two of the disks. The info you provided about the largest disk not needing a ring is new, and appreciated. But this still leaves me with two rings and two disks that don't fit each other or anything else. And lastly, one of the recessed rings has a notch on the same side, meaning if the disk is supposed to fit in there, it's on the wrong side, with respect to the instructions and diagram.

Other than that, everything makes sense.

You're probably right -- it will become more clear when I have thing apart. I just like to have a mental picture of what it should look like before I have the thing in pieces.

Thanks.
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Old 10-14-2001, 08:40 PM   #10
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open it up and everything will make sense

just remember, i wnat to know if there is a spring and small plate thing behind the vacuum line. it doesnt show it in the diagram so i dont know exactly how it works. under boost is pushes the plate onto the diaphram and then hits the plate causing the fuel pressure to rise?
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Old 10-15-2001, 01:47 AM   #11
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Quote:
Originally posted by Andrew
open it up and everything will make sense

just remember, i wnat to know if there is a spring and small plate thing behind the vacuum line. it doesnt show it in the diagram so i dont know exactly how it works. under boost is pushes the plate onto the diaphram and then hits the plate causing the fuel pressure to rise?
I opened it up, and it made some sense, but it's still somewhat confusing. I see now that the 4:1 disc, for example fits inside the entire ring, and the recessed portion of the ring sits around the screws in the middle. Some other rings fit around the screws without requiring a recess. Still another ring (the 8:1 ring), fits around the screws without needing a recess, but has one anyway.

I put the 8:1 disc in, with a recessed ring that had a notch on the same side as the recess. Confusingly, the only way this fits in there is with the notch (and recess) facing up, which is contrary to their instructions. If the notch is facing down, the 8:1 disc sits on top of the whole thing and cannot press on the "button" at all. The diaphragm won't be able to move it.

To answer your question about the spring -- there was no such device in my setup. I.e., there is nothing between the vacuum input and the diaphragm (if I understand your question correctly). It was exactly as the diagram shows. Hopefully the thing you're describing isn't the spring and small button that the swappable disk presses on. I don't think this comes out unless you disassemble the RRFPR further (which requires that the unit be returned to Vortech for repair). If you have it loose in your hand, you may have a problem. You didn't touch those screws they said not to touch, did you?

This is my understanding of the operation of the device: The boost pushes on the diaphragm, which pushes on the plate, which, in turn, pushes on the "button" seen on the main body of the RRFPR. The larger plates have a larger surface area, which increases the force on the "button" (since F=P*A), which increases the fuel pressure gradient. Under vacuum, the diaphragm is not compressed, and does not press on the disk at all (which in turn, applies no force to the "button"). Possibly, the notches in the rings are to help relieve pressure under the disk as it compresses toward the button, although why some would have them and some not is not clear to me. Perhaps they were tuned empirically, and the notch sizes and locations are simply what works for the pressure gradient they wanted.
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Old 10-15-2001, 02:02 AM   #12
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hey im going to go open mine up right now and take a picture of what im talking about.
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Old 10-15-2001, 03:03 AM   #13
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http://www.geocities.com/specopsrb6/vortech.html


i posted some pics of my weird spring thing and how it sits on the vacuum side of the FPR.

i also made a how to video of the 8:1 since you were having problems watch it in quicktime.
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Old 10-15-2001, 03:56 AM   #14
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Quote:
Originally posted by Andrew
http://www.geocities.com/specopsrb6/vortech.html

i posted some pics of my weird spring thing and how it sits on the vacuum side of the FPR.

i also made a how to video of the 8:1 since you were having problems watch it in quicktime.
My FMU doesn't look like that. There is just a hole in the top plate where the vac fitting is (no spring, no small plate, etc.). Maybe they changed the design. How old is your unit? I don't know how old mine is. I was assuming it was new, since it showed no signs of wear. Could've been sitting on a shelf for a while, I guess. Was yours a take-off, or have you had it for a while, maybe?

As stated in my earlier posts, my 8:1 ring doesn't look like that either. It has a notch on the same side as the recess. Hence the confusion. The directions clearly state to put the notch facing down. As your gripping movie indicates, you have to install the 8:1 ring with the recess up, which, in my case, means the notch is also up. See my point?

The attached picture shows the ring and the disk in place on the unit. I don't have a picture of the top cover (showing its lack of spring), unfortunately.

Well, anyways. Thanks for adding to the confusion. Hope you get your spring thing figured out.
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Old 10-15-2001, 03:59 AM   #15
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im not sure when mine was made. i got it off a guy who had a first gen JC Sports turbokit. im going to call them up tomorrow to find out *** this spring is. but i would suggest you do the same as that is really weird that the recess is on the same side as the notch. maybe we both can get some things cleared up if we talk to the people who made it
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Old 10-15-2001, 04:09 AM   #16
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Quote:
Originally posted by Andrew
im not sure when mine was made. i got it off a guy who had a first gen JC Sports turbokit. im going to call them up tomorrow to find out *** this spring is. but i would suggest you do the same as that is really weird that the recess is on the same side as the notch. maybe we both can get some things cleared up if we talk to the people who made it
I was definitely planning on giving them a call tomorrow. My urgency has lessened a bit since the FMU seems to be operating properly, but I'm still very curious.

Please post if you call before I do. Between this and the trouble skywalker had with his SuperFMU, the Vortech people probably think Subaru owners are all a bunch of idiots.
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Old 10-15-2001, 04:15 AM   #17
Andrew
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Yeah I think Im only running on 3cylinders up in my head

I just found this at vortechs website....http://www.vortechsuperchargers.com/...fmurecalim.pdf

would have made my numerous posts alot shorter



also here is the 8:1 in my FMU...
http://www.geocities.com/specopsrb6/Image002.jpg

copy and paste in browser.
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