Let's talk Diverter Valves

[madmax199]

The board is a little slow today so I tought I would start a thread about diverter valves(I posted my modified DV on QW a while back but I need to share the love with you guys also)

I wanted a valve capable of holding 30-35 psi steady while keeping stock driveability, response and staying maintenance free. Yes, I tried aftermarket valves but they have slow release response, even slower recovery and require maintenance.

Being that I'm a DSM/evo guy and work for Mitsubishi, I decided to use Mitsu's late metal valve found on Evo IX and X for my project. It's a good unit from the get go, offering more release volume, larger and stronger diaphragm than the TT's Bosh unit and capable of holding about 25 psi with slow leak at 17 psi.




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First thing I did was the old "DSM crushing mod"
It simply raises the internal spring holding capacity by cruching the top chamber slightly. Preloading of the spring allows the valve to hold boost up to 30+ psi steady.

Now that the unit is capable of holding boost past 30 PSI, I needed to make it leak free. One way to do so is to drill an external reference port and then seal the factory internal port between the top and bottom of the diaphragm. This makes the valve virtually leak free at psi that the car will never see(45+ tested).

The modified valve will now be capable of holding boost without any leak, keep the stock like fast release, recover at the turbo's max psi while being surge free. The only thing on the car that need to change is the size of the hoses because the mitsubishi in/out nipples are bigger. To me that was not even an issue as I was already using an evo metal bov/tb pipe because I needed a spot to weld methanol nozzles bungs, so it's plug and play.




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Machined metal plug(no more JB weld)




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The following is a test on reaction time that a car mag did on various dv on the market.
What you are looking at is after the release, when the driver heads back to WOT, how quick the valve recovers. All tests were run at 9 psi.

At the first point of 100% throttle:
DSM 1G/evo DV = 2 psi
DSM 1G/evo DV/crushed = 1 psi
DSM 2G DV plastic = 3.5 psi
WRX DV = 3 psi
FD3S DV = 4.5 psi
R32 GTR DV = 3 psi
Bosch DV = 3 psi
A'pexi twin chamber BOV = 4 psi
Bailey DV = 4 psi
Blitz super sound BOV = 2 psi
HKS SSQV BOV = 3.5 psi
Stratmosphere hyperboost adjustable DV = 4.5 psi
Vortech race BOV = 3 psi
Forge piston ram BOV = 5.5 psi
Forge piston ram DV = 4 psi
Greddy type S DV = 2 psi
Greddy type R DV = 3 psi

Feel free to discuss and give inputs on your experiences on DV on the TT.

[PLAYED TT]

Hmm the Baily's is that slow. I always thought it was faster than my stock

[wrparrish]

Thats great information, and something i'd like to get my hands on.

Can you explain or show the blocking of the internal hole? That was the only part i didnt follow or grasp.

[taifighter]

I've ran a few. The first aftermarket was the Forge Splitter when I was chipped and I also used it at first when I went BT. The Splitter was a cool idea and worked great @ chipped performance levels but couldn't move the volume once I went BT.

I went with a 004 but always had flutter at partial throttle lift. WOT lift was ok but still flutteres tward the end of the release. I ran like that for about a year.

The car started to run funny and I couldn't nail it down. I did a bunch of maintenance and replaced all the common sensors. The car ran better but stumbled at WOT release between shifts.

Then I got a SSQV.
Best valve ever.
No flutter at any time. Went back to recirculating (004 was atmospheric) and it runs great. Plus, with the recirc kit, you don't have the ricer whistle.

[madmax199]

Thats great information, and something i'd like to get my hands on.

Can you explain or show the blocking of the internal hole? That was the only part i didnt follow or grasp.

That is what the valve looks like when it's open. I ended up tapping the whole and used a recessed allen bolt for a more solid solution than JB weld.



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Valve mounted with clear hoses to show the reducers/adapters neded to go from 4G63T to 1.8t




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EDIT

This is what the valve looks like nowadays before shipping. Silicone reducers with metal barb fittings !

[madmax199]

Then I got a SSQV.
Best valve ever.
No flutter at any time. Went back to recirculating (004 was atmospheric) and it runs great. Plus, with the recirc kit, you don't have the ricer whistle.

Altough it may be good at holding boost, If you look at the test it is still a slow ass valve in terms of recovery at 3.5 psi. I personally could not stand a slow responding valve .

[taifighter]

I'm not worried, it's in the middle of the field compared to the other ones on the list. The car runs smoother with it, it sounds good, and gets the job done. I also got it at a great price on closeout scratch n dent because there were a few minor scuffs in the finish.

[Mantvis]

What do u guys think of EVOMS DV'S?
since i got it not too long ago

[madmax199]

I'm not worried, it's in the middle of the field compared to the other ones on the list. The car runs smoother with it, it sounds good, and gets the job done. I also got it at a great price on closeout scratch n dent because there were a few minor scuffs in the finish.

it is like you said a middle of the road performer and getting anything at a deal makes it better.

[madmax199]

What do u guys think of EVOMS DV'S?
since i got it not too long ago

I have no firsthand experience with it so I can't really comment.

In general, almost any piston dv from what you can see is going to be lazy in response.

Also if the valve construction allows for pressurized air to act against the set spring tension it will naturally cause it to crack open(leak) before it is suppose to.
That early leakage in the valve operation is what I prevented by plugging the reference hole between the two chambers and re-drilling an external boost reference port.

[taifighter]

I had one of those kits on my Talon that took a stock 1g valve and added a line and a box to it. I can't remember the name of the vendor but I sent it out for the service. Its a really cool idea that I've only seen on DSMs

[madmax199]

I had one of those kits on my Talon that took a stock 1g valve and added a line and a box to it. I can't remember the name of the vendor but I sent it out for the service. Its a really cool idea that I've only seen on DSMs

Dejon power tool quick release box?

Same concept, except that they hook the external boost port that I drilled to a solenoid box making the release even quicker(forced vaccum).

The problem with that is part throttle is erratic. I drew the line there because venting the external port to the atmosphere is fast enough(less than 1 psi for full recoveries) that I'd deal with that over part throttle issues.

[taifighter]

That's the one.

That was my first turbo car <3

I never noticed irratic part throttle tied to the valve, but then again I didn't know as much as I do now so it very well could have left something to be desired

[20v master]

I run a Greddy Type S on my big turbo motor, but don't recirculate. Going on 5 years now with nary a problem.

[madmax199]

I run a Greddy Type S on my big turbo motor, but don't recirculate. Going on 5 years now with nary a problem.

The Greddy type and the Blitz s s bov are two of the better valves out there. As you can see in the test, they both only needed 2 psi for recovery.

How is maintenance on it and how does it hold high boost?

[omerkm1]

Altough it may be good at holding boost, If you look at the test it is still a slow ass valve in terms of recovery at 3.5 psi. I personally could not stand a slow responding valve .

So how much $$$ to get a madmax DV?

[madmax199]

So how much $$$ to get a madmax DV?

It is really not that hard to make but if you insist, I would say the price of the valve and $10 for shipping.

If you buy the valve (evolutionm.net classifieds is your best) and ship it to me, just paypal the $10 so I can ship it back and voila you got your madmax dv.

[20v master]

How is maintenance on it and how does it hold high boost?

I haven't opened the thing since I took the cap off to polish off the purple when I got it, and it has held the 32-34 psi I've run on 110 octane a dozen or so times over the years.

[madmax199]

I am getting several PM and e-mails about the my evo modded DV and how to do it in details. I am going to post the steps here so everyone can have acces to it:

1) Slightly crush the ceiling of the top chamber.

Please be gentle and don't go too far, a 1 to 2 mm depression is enough preload on the spring. The best way to do this is to sandwich the valve on a vice horizontally with a socket. (just use a slightly smaller socket on the side you want to crush and go slowly)

The top of the valve pictured here used to be flat


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2) Drill your 3mm external reference port(you are only opening the original to the atmosphere)



drill just enough to vent out the hole you are plugging in step 3


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3) Plug the original internal boost reference port.

JB weld will work but I tapped and plugged it with a recessed head allen screw.


this hole you are plugging is the one you want to vent by drilling in step 2


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[omerkm1]

You should make up a couple if you have access to the valves for sale. I have been fishing around the evo forum and cant find a 1gen dv for sale. Thanks for the post with pics though....

[madmax199]

You should make up a couple if you have access to the valves for sale. I have been fishing around the evo forum and cant find a 1gen dv for sale. Thanks for the post with pics though....

You want EVO X, EVO 9 and EVO MR metal valve, 1st gen valve is the metal valve found on the early DSMs and would require a flange.

I could easily source a few valves and modify them but I'd only do so if I have prepaid takers lined up.

I'm not looking to make any profit and I'm just helping the community. If anyone really want a valve, let me know and I will direct you where to find them.

[omerkm1]

You want EVO X, EVO 9 and EVO MR metal valve, 1st gen valve is the metal valve found on the early DSMs and would require a flange.

I could easily source a few valves and modify them but I'd only do so if I have prepaid takers lined up.

I'm not looking to make any profit and I'm just helping the community. If anyone really want a valve, let me know and I will direct you where to find them.

PM Sent.

[madmax199]

PM Sent.

Replied

[omerkm1]

Replied

Thanks Max!!

[madmax199]

Thanks Max!!

Valve on it's way to me

[madmax199]

I got a few pm about what else is needed to make my modified valve work on the TT.
All that is needed is (2) 1" to 1 1/4 couplings, a piece of 1 1/4" hose and hoses clamps.

This is a picture of omerkm1 valve that's going out today minus the hose(busy at work and didn't get to cut it yet)




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[20v master]

Nice Mitsu anny chair/stool.

[madmax199]

Nice Mitsu anny chair/stool.

Good eyes

[omerkm1]

I got a few pm about what else is needed to make my modified valve work on the TT.
All that is needed is (2) 1" to 1 1/4 couplings, a piece of 1 1/4" hose and hoses clamps.

This is a picture of omerkm1 valve that's going out today minus the hose(busy at work and didn't get to cut it yet)




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Thanks Max!

[omerkm1]

Madmax DV is installed and the performance is amazing. The car hits boost quick but also holds it better and less drop between shifts. I would recommend this to anyone that can talk Max into building one for.

FYI - I am coming from a Forge 007 DV

[madmax199]

Madmax DV is installed and the performance is amazing. The car hits boost quick but also holds it better and less drop between shifts. I would recommend this to anyone that can talk Max into building one for.

FYI - I am coming from a Forge 007 DV

I'm glad you like it

This thing really rocks, we had tested on an evoX before I sent it to you. The car picked up 4 psi of boost and hit over 320 load from a previous best of 280. We even had to rescale the ecu since mitsu had it only scaled to 320, simply amazing for just a BOV.

[madmax199]

Omer, can you post a picture of the valve mounted. I'd like to see it on car without a dv relocation(if you don't have one). Thanks

[omerkm1]

Omer, can you post a picture of the valve mounted. I'd like to see it on car without a dv relocation(if you don't have one). Thanks

Sure thing. Car is back under the knife and I wont be able to post a pic till Monday.

[madmax199]

Sure thing. Car is back under the knife and I wont be able to post a pic till Monday.

That's fine, I'm not going anywhere .

[bvgoosedd]

i just seen that the blitz also has a recirculation adapter. what kit do i need to put one on my car. i should be good since i am big turbo. is anyone running one?