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  1. #1
    marsie's Avatar
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    S4 diverter valves

    i am starting to suspect the diverter valves are acting up on my 1999 S4.I have been offered different advice on what to replace them with? standard,upgrade or aftermaket(forge etc)
    As far as i know the ones fitted are standard,also am i as well off replacing the little valve thingy at the same time(n75??)
    Any advice and rough costs would be brill
    Ta
    Paul
    1999 Audi S4 2.7 bi-turbo*SOLD*
    1997 landrover defender 100" winch challenge truck
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  3. #2
    "Stick a V8 in it!"

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    The most common recommended OE swap would be to replace them with 710N valves from a TT or S3.

    They're about 20-25 new.

    Or you could fit something like the Forge 007 recirc, but i dont see the point personally.

    2000 A4 1.8T Sport Quattro Avant, Berry Pearl
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  4. #3
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    the forge one isnt that smart from what ive seen. a friend of mine had a 20vt, the dv failed giving fantastic compressor surge noises.

    the forge item went on and in certain conditions it still got that "doh" sound when you came off the throttle

    the OE one didnt allow any noises at all

  5. #4
    Lee Goodall's Avatar
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    I like the Forge DV.. the build quality is top notch and it's tuneable for increased/decreased boost pressure which is handy. Only downside is the cost!

  6. #5
    Fraser's Avatar
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    the forge ones are serviceable as well so the long term outlay should be less

  7. #6
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    I chewed this over for a while and decided to go for the 710N's.

    The cost, the servicing and the noise put me off the Forge ones.




  8. #7
    s4marsh's Avatar
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    i had the s3 one's fitted by the tuner before my remap and have had no issues with them at all
    Last edited by s4marsh; 28th September 2009 at 15:22.

  9. #8
    Geeman's Avatar
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    S3 valves = TT 225 valves... right?
    NEW 6 cylinder 40mm front springs - £40

    PM me for more info

  10. #9
    s4marsh's Avatar
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    yeah i would have thought so

  11. #10
    Geeman's Avatar
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    That's what I've got on my 1.8T... no problems with it at all.
    NEW 6 cylinder 40mm front springs - £40

    PM me for more info

  12. #11
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    I also suspect my valves are playing up too, However when i had a look at them they were already the forge ones. I had a s3 one lying around and felt the spring pressure was far far higher on that than the forge ones. I havent a clue how long the forge ones have been on, Can they loose their springyness and become ineffective?

  13. #12
    s4marsh's Avatar
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    yeah metal fatigue and age could cause them to slacken up a bit compared to new

  14. #13
    Lee Goodall's Avatar
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    ..best to try and keep them well greased too.

  15. #14
    marsie's Avatar
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    Thanks for the info guys,think i will go for the 710n's.Is there any benefit to fitting these over the standard S4 valves?
    1999 Audi S4 2.7 bi-turbo*SOLD*
    1997 landrover defender 100" winch challenge truck
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  16. #15
    s4marsh's Avatar
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    just the cost i think

  17. #16
    Oranoco's Avatar
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    I've got no complaints with my Forge 007 on my 1.8T. Been good as gold since fitted. Bargain at 15 as well

    Life begins at 140mph
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  18. #17
    "Stick a V8 in it!"

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    marsie: they have stronger internals and a bigger spring, ideal if your uping the power.

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  19. #18
    S4twiggy's Avatar
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    i dont know wot the difference is with the 710A and 710N can someone eloborate as i have one 710A which came with the car out the factory and one 710N which was put on when i had my lamda sensor done. should i get another 710N for the other side?

  20. #19
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    Personally i would, just to balance things out especially with one being new.

  21. #20
    marsie's Avatar
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    Quote Originally Posted by aragorn View Post
    marsie: they have stronger internals and a bigger spring, ideal if your uping the power.
    Cheers,gunna contact TPS tomorow for prices,think i may change the n75 valve also at the same time
    Paul
    1999 Audi S4 2.7 bi-turbo*SOLD*
    1997 landrover defender 100" winch challenge truck
    1998 Range rover 4.6 autobiography

  22. #21
    S4twiggy's Avatar
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    i mite do that too mate, new DV and N75 all for 60......sorted

  23. #22
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    I've done the MAF and the DV's since I've had the car, but I haven't renewed the N75 yet.

    Where's cheapest for them at the moment?

  24. #23
    s4marsh's Avatar
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    dont know if this is of any use to anyone http://www.s4biturbo.com/art-dvtests.php
    there are other good articles on there

  25. #24
    marsie's Avatar
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    has anyone got the correct part numbers for the 710n valves and n75? the guy at TPS had no idea what i was talking about and kept asking for my chassis number even though i explaned that it wasnt a standard fit on my car
    1999 Audi S4 2.7 bi-turbo*SOLD*
    1997 landrover defender 100" winch challenge truck
    1998 Range rover 4.6 autobiography

  26. #25
    Blue_Thunder's Avatar
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    06A 145 710N

    There's a guy on eBay selling them for 31 each.

    Why are you changing the N75? If it ain't broke, don't fix it!
    Mo power, mo problems

  27. #26
    s4marsh's Avatar
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    i think they're about the same from audi too, i'm sure thats where mine came from when they were changed

  28. #27
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    Quote Originally Posted by Blue_Thunder View Post
    Why are you changing the N75? If it ain't broke, don't fix it!
    Moi?

    Are these an item that either works or doesn't work then (unlike a slowly fatiguing MAF)?

    Nothing shows up on the Rosstech.

  29. #28
    Blue_Thunder's Avatar
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    If an N75 is failing you'll know about it. You get erratic boost and can feel the spikes and flat spots when you are at WOT. They will quite often show an 'Overboosting' DTC on Vagcom if they are faulty.

    You'll probably find most of the VAG turbo cars are still running their original N75's with no problems.

    I got a new one when trying to fault find on my car. The only difference it made was to the contents of my wallet. Would only look to changing the N75 if you have noticeable boost issues and you have ruled out all of 'the usual suspects'.
    Mo power, mo problems

  30. #29
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    Quote Originally Posted by Matt82 View Post
    the forge one isnt that smart from what ive seen. a friend of mine had a 20vt, the dv failed giving fantastic compressor surge noises.

    the forge item went on and in certain conditions it still got that "doh" sound when you came off the throttle

    the OE one didnt allow any noises at all

    I can 2nd that, i fitted one to my old chipped 1.8T Passat and wasn't impressed at all as the extra 50 horses couldnt really be felt from the chip, i then tried it with my old stock DV and the difference was imense.

    I actually built a test rig to see if the forge was holding boost and i found it to be leaking like a sieve, where as the standard one didnt leak at all, i even showed the tuner that did my chip and who supplied the forge dv, i also tried a few more forge dv's he had and none of them sealed properly, he was quite shocked and promptly gave me a refund, he also supplied my findings to forge but they weren't really interested, all they did was send me a couple of different springs and a free keyring and stickers.

    In the end i just fitted a new 225bhp TT standard DV and never had a problem, it happily held 18psi boost all day long.

  31. #30
    Nez
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    I have the Forge DV on my S4 and I am very happy with it
    (Audi S4 351.9 PS, 603 Nm, MRC Custom Remap XS Power DP's, Cat Back Exhaust, Forge DV, RS4 Intercoolers, RS4 Breaks and Induction kit)



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