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Thread: DIY Turbo Control Valve

  1. #11
    Join Date
    Aug 2009
    Location
    Great Falls, MT
    Posts
    183

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    Newly built HD TCV is installed, now I am going to do a test drive! Will report back after the break in!
    2001 XC70 Java 214K 16T with ARD Green tune
    2006 XC90 V8 Silver 96K

  2. #12
    Join Date
    Mar 2004
    Location
    Washington State
    Posts
    280

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    Cool. What did you do for a mount?
    Current: 2010 XC70 T6 Caspian Blue/Grey

    Previous: 2001 V70XC Nautic Blue/Grey 218K Volvo High Mileage Club,

  3. #13
    Join Date
    Aug 2009
    Location
    Great Falls, MT
    Posts
    183

    Talking Works Great!

    The new DIY Turbo Control Valve works great! I did the break in period via how iPd describes for their TCV and it definitely improves drivability. The new solenoid is simply more responsive than the old one; giving me turbo when I need it, not turbo when the old tcv decided to give it to me.

    Here is a quick run down on what exactly is needed to accomplish this project.

    1) The Turbo Control Solenoid found here!
    2) 1/4" barb 1/8" NPT fitting found here!
    3) Bosch EV1 Connector found here!

    Other information

    From what I saw on the electrical connectors, there is no positive or negative wire, so I just went ahead and put the connector on without worrying.

    I am going to fabricate a mount soon, but I currently have some zip ties holding the TCV on the air box.

    For hose connection instructions and break in instructions follow the instructions provided here! The hoses all go in the same place as the iPd unit.

    There is no need to put teflon tape on the NPT fittings as the clearance is simply not there; and the fittings tighten down very tight and secure.

    I used a piece of vacuum tube cut down the center to cover the electrical wire and boot versus an actual rubber boot at the connector; I may change that in the future.

    For about $50 dollars you have your own HD turbo control valve that will improve turbo response and increase the fun factor! Here is a zip tie happy photo (when time allows I will make this more presentable...aka less zip ties)! Enjoy!

    2001 XC70 Java 214K 16T with ARD Green tune
    2006 XC90 V8 Silver 96K

  4. #14
    Join Date
    Mar 2008
    Location
    Nova Scotia
    Posts
    2,294

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    Javaxc70:

    So after a week or so of use, how is your home-built TCV working out?

    Thanks,

    Bill
    Western Head, NS CDN

    '02 V70XC (Ash Gray)-350K kms to-date
    '96 854R (Red)-real CDN-spec 5 speed R - gone @250k kms
    '98 V70 -wife's basic, no options wagon - gone @390k kms
    '91 744GL - killed by son @ 220K kms
    '90 744T w/Turbo Plus -killed by son @260K mi
    '78 245 w/4sp-OD -killed by wife @166K mi
    '76 265 w/4sp-OD -gas hog gone
    And a whole tonne of other Euro stuff (VW (8), SAAB (5), Land Rover (4), Audi (3), BMW (2), Porsche (2), Mini (2), Opel (1), MB (1), MG (1), Sunbeam (1))

  5. #15
    Join Date
    Jan 2007
    Location
    Nova Scotia, Canada
    Posts
    1,438

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    Yeah, I'm curious about that too. Fill us in!!

    Dave.
    Our Most Probable Fate Is Death !!!

  6. #16
    Join Date
    Aug 2009
    Location
    Great Falls, MT
    Posts
    183

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    After 1 week the DIY TCV is working perfectly! I really like the faster response of the unit, as it gives you turbo when you need it. I have been driving it daily for the past week (usually wife's car) and have been impressed with the response time. Another nice added bonus is the ability to take apart and clean. So Far So Good!
    2001 XC70 Java 214K 16T with ARD Green tune
    2006 XC90 V8 Silver 96K

  7. #17
    Join Date
    Nov 2006
    Location
    Savannah, GA
    Posts
    552

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    Nice work, dude.

    I bought one from iPD, and it really didn't make much difference. So I changed out two of the three vacuum lines with brand new silicon tubing. The one tube going to the bottom of the turbo I didn't change because I just couldn't get my hands up in there.

    But changing just two of the three hoses brought the car to life. I wonder how much better it'll run when I pay the shop to swap out that last hose for me?

    Old vacuum lines degrade from the constant heat, and will collapse under the negative pressure reducing the negative signal, especially on the Volvos with the plastic belly pan trapping all that heat in there for hours after shutdown. I took my belly pan off.

  8. #18
    Join Date
    Mar 2005
    Location
    Pacific Northwest
    Posts
    1,452

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    Quote Originally Posted by Allen View Post
    it really didn't make much difference.
    Ditto, built this thing and made little to no difference on my V70XC and V70T5. I'll be trying tubing next
    SOLD 2001 V70XC @123k 20mpg. No more Volvos due to shift to better gas mileage
    SOLD 2001 V70 T5 @132k 22mpg.
    2013 Tesla Model S 85kWHr 14k miles 90 eMPG. Best car ever
    2011 Toyota Prius Model2 45k 60mpg
    2001 VW Golf GLS 1.8T Auto 143k Fahrvergnügen but only 23mpg
    http://freewebs.com/howardsvolvos/

  9. #19
    Join Date
    Aug 2009
    Location
    Great Falls, MT
    Posts
    183

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    I would definitely recommend replacing the vacuum hose. I replaced all my vacuum hoses well before the TCV and noticed a difference in everyday driving. I also replaced my CBV shortly before this upgrade which may have helped out. My XC has some higher mileage, so these upgrades together might have just brought me back to a nice stage 0!
    2001 XC70 Java 214K 16T with ARD Green tune
    2006 XC90 V8 Silver 96K

  10. #20
    Join Date
    Jan 2010
    Location
    Raleigh, NC
    Posts
    433

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    I'm thinking of going the DIY route for my TCV...but I'm looking for suggestions + pros/cons for the vacuum lines. I'm considering silicone, but what's a minimum wall thickness I should go for when I buy the lines? IPD says they're silicone tubing is great, but they don't even list the inside diameter of it...not that I could see anyway.

    I see 2.5mm inside diameter on boostcontroller.com and I think that's a decent wall thickness, but I was looking for some input from people who've actually done this. Or should I just forget the silicone and stick with rubber?

    2001 V70 XC
    133,000 miles. New Transmission at 73,000 miles.
    Chassis #002481

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