Tumblers Deleted.... - Subaru WRX Forum
 
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#1 Old 01-23-2006, 05:25 PM
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Cool Tumblers Deleted....

Ok, I didn't post this in the "HOW TO" because I am not an expert and I am not posting this as a step by step directions on how to do what was done.. Now with that being said..


I was able to get 6 hours free this weekend so I got busy on my tumblers.. My motor came in last week all worked over and ready to be dropped in so I wanted to get all the misc odds and ends ready for install day.. Since I had the tumblers already removed from the old EJ20 I decided to de-butterfly them and port them.. I didn't see the need to pay 250 bucks for some one else to do this so I did it my self..

First I took off the sensors on each end of the tumbler body.. The smaller sensor ready the position of the butterfly valves and the larger is the boost actuated motor that operates the tumblers.. Once the sensors were removed the small bolts that hold the butterfly valve to the rod had to be removed.. Caution was needed here since the bolts are "Peened" over from Subaru to prevent them from backing out over time.. A small carbide tip cutter was used to grind the end of the bolt till it was flush with the rod. Once that was achieved a #2 flat head screw driver (Craftsmen Only) works well to back out the small brass screws. CAUTION: The screws will round easily, make sure you us a good screw driver and apply pressure against the screw when backing them out.. Once. The butterfly assembly was removed an issue arose.. "What to do about the holes".. An option was to leave the sensors in place but with the higher boost levels will the plastic be strong enough? The decision was made to make end caps out of aluminum.. My Milling skills are not the best as I don't run the milling machine often, but I am kinda satisfied with the results.. I even got my girl friend in on the action.. What is hotter then a female "Steelers Fan" all bundled up to help out in the cold machine shop working on the WRX?? After that issue was conquered I moved onto the Divider that allowed a moderate amount of air to bypass the butterfly valves.. For this task I again turned to the milling machine.. Once I milled the divider out I grabbed my die grinder and several assorted sizes of paddle wheel sanding disks.. I worked in stages and in areas with the proper size wheel to achieve a smooth consistent taper across the tumbler body.. I am happy with my results, I am not sure as to the flow ratings, or the consistency between each port..

Hit me up with thoughts and comments.. If any one is looking to get their tumblers de-valved I am more than happy to help out...
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#2 Old 01-23-2006, 08:03 PM
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Nice job

Jon
"We live for a good time, not a long time."
RIP Colin McRae
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#3 Old 01-23-2006, 08:58 PM
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I have never seen these on a car before, what do they do, why are they necessary, and what does removing them do?
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#4 Old 01-24-2006, 12:56 AM
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Get her some safety glasses will ya? !Laugh!


Nice job on this man. Looks good.

My car is well, it's like 10 lbs of shit in a 5 lb bag...

<------ Click to see what I'm workin' with. ;)
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#5 Old 01-24-2006, 02:44 PM
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Well Done!!!!!
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#6 Old 01-24-2006, 02:58 PM
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Lil shoaf damn you lol! Looks good man....how you like it? Any start up issues?

Chris- ▼SbiΣ Mi▼
242 AWHP / 318 TQ
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#7 Old 01-24-2006, 04:11 PM
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Manics, I am still awaiting the arrival of my Hydra and Injectors so I have not been able to "Test" the results..

mxboy15u, The "Tumbler Generator Valve" is a cold start assistance device that is located in-between the Intake manifold and the Heads.. If you look at your engine look for the fuel injectors as they are located "in" the tumblers.. If you look closely you will see small holes on the outside of the tumbler body at the quadrant of the port almost at the bottom, this is where the fuel injector goes.. If not for this I would have simply machined a "Spacer" to replace the entire unit all together..
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#8 Old 01-24-2006, 06:06 PM
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badass bro. you should start making your own exhaust components and call it shoaf performance. ill sport a sticker

Gregory-
keep it in the dirt.
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#9 Old 01-24-2006, 07:18 PM
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So you left the rods out? Are you going to use a stand alone EM?

"Life's a bowl of punch so go ahead and Spike it!" -311
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#10 Old 01-24-2006, 07:19 PM
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Oddly enough the 05' 4.6 Mustangs have these as well built into their intake manifold.
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#11 Old 01-25-2006, 03:13 PM
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Quote:
Originally Posted by nick4592
So you left the rods out? Are you going to use a stand alone EM?
Yes I did leave the rods out, I am awaiting my Hydra to get in.. It is a full stand alone that is not at all OBDII ready so it will not even read those tgv sensors..

As for Shoaf Performance.. I designed and built a custom Equal length T4 Turbo Header for my 01 Celica GTS.. It bolted up sweet as all hell, however I sold the car before I finished compiling the parts for the custom turbo set up.. It was SO MUCH EASIER to start with the turbo charged WRX and work up from there....
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