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  1. #1
    Non-member GaryS's Avatar
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    c20let + external wastegate

    Hello, i have just got a new turbo for my c20let cavalier, i got a tubular manifold, T28R turbo and a external wastegate but im unsure how to plumb up the pipe work, can anyone point me in the right direction?

    Cheers.

  2. #2
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    Scoff's Avatar
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    Re: c20let + external wastegate

    Treat it like a 2 port actuator.

    You can get it to run "wastegate pressure" (ie, the boost that the spring is rated too) by just connecting the bottom port to your compressor outlet, or boost pipe, etc. Leave the top port open.

    If you have a boost controller with a solenoid then it'll go something like this:


  3. #3
    Non-member GaryS's Avatar
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    Re: c20let + external wastegate

    Thanks very much for that, just what i needed, Cheers.

  4. #4
    Non-member benj88's Avatar
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    Re: c20let + external wastegate

    Love cavs get some pics up mate, I'm currently restoring a White corsa Gsi

  5. #5
    Shifter of old Freezers djinuk's Avatar
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    Re: c20let + external wastegate

    have no fear....... Rtoc'ers here.... for when all the other forums say "take it to a tuner".



  6. #6
    Non-member GaryS's Avatar
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    Re: c20let + external wastegate

    I will get some pics up this weekend of the new engine bay when i take a few new ones of the mods




    Oh and another question on the wastegate, when the engine is running i can feel suction through the screamer pipe, is this normal or have i done something wrong?




    Cheers people.

  7. #7
    Non-member GaryS's Avatar
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    Re: c20let + external wastegate

    Can anyone help in my last question? as i dont want to bugger it up. Thanks.

  8. #8
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    Re: c20let + external wastegate

    You shouldn't be able to feel anything on the screamer pipe, there cant possibly be suction on that pipe, are you sure you're not just feeling it ? Tried holding a latex glove over it to see if it inflates/deflates(!)? It should do nothing at idle because the valve is shut. The only thing that might open it would be if you'd got manifold vacuum on the top port some how, and even then it would be chugging exhaust gas, not sucking !

  9. #9
    Non-member GaryS's Avatar
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    Re: c20let + external wastegate

    I know what it is now, its just a sh1t. got it off ebay, the valve dont seal properly oh well best splash out for a good one.


    What do people recommend for a decent wastegate?

  10. #10
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    Re: c20let + external wastegate

    Dont write it off until you're sure the seat is sat right and that the valve is clamped up properly to the manifold (since it's this clamp that holds the valve seat in square).

    But if it's just junk then buy a tial, turbosmart or other well known brand

  11. #11
    Non-member 5teve L's Avatar
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    Re: c20let + external wastegate

    If it's a 38mm, I think Handy had a tial one for sale....

  12. #12
    Non-member tiff_lee's Avatar
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    Re: c20let + external wastegate

    Is your cav a 'proper' turbo i.e 4x4?
    Last edited by tiff_lee; 17-11-2011 at 22:43.

  13. #13
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    Re: c20let + external wastegate

    This was my baby I owned in those rare years I didn't have a Raider!




  14. #14
    Non-member tiff_lee's Avatar
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    Re: c20let + external wastegate

    Nice Steve and nice plate!

    This is my 'cav'



  15. #15
    Non-member 5teve L's Avatar
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    Re: c20let + external wastegate

    The only memory I have of a cav turbo is pulling past one @ ***mph in my brothers old tungy GT Turbo on the way to Southend, & lipreading the bods in the car going 'f**cking hell' blimey I feel old now that must have been 15 years ago or more

  16. #16
    Non-member GaryS's Avatar
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    Re: c20let + external wastegate

    Here are a few pics of me car
    Attached Images Attached Images      

  17. #17
    Non-member GaryS's Avatar
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    Re: c20let + external wastegate

    Attached Images Attached Images  

  18. #18
    Non-member GaryS's Avatar
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    Re: c20let + external wastegate

    Right, took my car for its first spin yesterday and im only getting 3psi of boost but spring is rated it 9psi, my boost pipes are not leaking that i can find, so is it my cheap demond wastegate off ebay thats leaking my boost away? ive piped it up as per scoffs pic with the top port open. I know that when the car is running i can feel suction throught the screamer pipe which should not happen. whats wrong? i guess it the wastegate.

    Can anyone shed me so magic light?

  19. #19
    Non-member Adam L's Avatar
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    Re: c20let + external wastegate

    Those ebay wastegates stink more than Polish peoples ****. With no word of a lie, every one I've prerssure tested has leaked, even brand new ones. Not only that but I got given one for free and it didn't even have a seat for the valve, so I can only assume people are running them without.

    Do as Scoff said and buy a decent one.

  20. #20
    Non-member GaryS's Avatar
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    Re: c20let + external wastegate

    Ok cool, right does anyone know of any decent websites/places to look for one?

  21. #21
    Non-member Brigsy's Avatar
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    Re: c20let + external wastegate

    I definitely wouldn't have the screamer pipe facing that bag around the battery mate, its asking for trouble?

  22. #22
    Non-member GaryS's Avatar
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    Re: c20let + external wastegate

    Quote Originally Posted by Brigsy View Post
    I definitely wouldn't have the screamer pipe facing that bag around the battery mate, its asking for trouble?
    Yeah erm i found out the other day that i melted abit of the bag

    I need to get one made up and pointed another way but it will have to stay there for now, but the wastegate dont work at the mo so should be fine i hope.

  23. #23
    Non-member GaryS's Avatar
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    Re: c20let + external wastegate

    found this if its the real thing, if so its cheap!

    http://www.ebay.co.uk/itm/2208209587...84.m1423.l2649

    but i need these adaptors to make it fit


    http://www.ebay.co.uk/itm/Adapter-in...item5886b1c618

    can i get these in the uk?

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