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How many of you guys have replaced your N75 valves?

Discussion in 'A4/S4 forum(B5 Chassis)' started by Soupie69uk, Mar 2, 2006.

  1. Soupie69uk
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    Soupie69uk Owner

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    I was just reading this.

    Link


    Pretty interesting.

    I think i may try a J valve in the next couple of months to see what its like.
    #1
  2. docurley
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    docurley Moderator Staff Member Moderator

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    Yep been thinking about this may order one today.
    #2
  3. Soupie69uk
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    Soupie69uk Owner

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    Which one the J or the H?
    #3
  4. madkebab
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    madkebab Member

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    I have the J and it really made a big difference. Boost was much more progressive and seemed to hold for longer. I know this particular valve works well for remapped cars that are non-dbw.
    #4
  5. docurley
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    docurley Moderator Staff Member Moderator

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    J all the way.
    #5
  6. Soupie69uk
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    Soupie69uk Owner

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    Cool i may as well give it a bash as well!

    Where is the best place to get one of these bad boys? And how much for?
    #6
  7. hop2407
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    hop2407 Active Member

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    So here's a comment from that link...

    "It is always safe to replace the DV with a bailey/TT valve, or forge, etc....the N75 I would leave alone, unless you begin noticing surging problesm/ limp modes........"

    As I have a Bailey DV, is this saying dont updrade / change the N75 ?

    Or will I not see much benefit from changing it ?
    #7
  8. madkebab
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    madkebab Member

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    VAG-PARTS.COM would be a good place to try. Got mine off of Ebay. You may well need to extend your vacuum hoses when you fit the J valve as the orientation is different. For the cost of approx. £30 its a definately worth doing.
    #8
  9. madkebab
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    madkebab Member

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    [ QUOTE ]
    So here's a comment from that link...

    "It is always safe to replace the DV with a bailey/TT valve, or forge, etc....the N75 I would leave alone, unless you begin noticing surging problesm/ limp modes........"

    As I have a Bailey DV, is this saying dont updrade / change the N75 ?

    Or will I not see much benefit from changing it ?

    [/ QUOTE ]

    I think what they are saying is that there are risks involved in changing the N75 Valve. I wouldnt recommend doing it on a non chipped car. However Ive had my J valve fitted for over a year and havent had any problems.
    #9
  10. Soupie69uk
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    Soupie69uk Owner

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    I just had a look on VagParts.com they will cost about £40 so i think i will give the J valve a bash in a couple of weeks.

    I will order it along with the Aero wiper kit.
    #10
  11. Beerzo
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    Beerzo Masa'warty 3200... Talk To Me!

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    I have had mine for a month or so now and no problems. I made a 166 BHP on the rollers at bedrock veedub. All i have is an N75 J, uprated DV ( doesnt create power) had a pipercross induction kit which i took off as all it was doing was sucking in hot ambient air from around the turbo. SO i could have made more pretty much with just the N75 J valve.

    I have A4 1.8 TS '97 (non-DWB)
    #11
  12. Soupie69uk
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    Soupie69uk Owner

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    Where about in Scotland are you based Beerzo?

    I have piperX induction kit to. I guess ur is the same as mine which replaces the lower part of the airbox?

    I fitted a S4 wheel liner though and made a mod to the front vent to make sure it gets some more cool air than there would be by just using the Hose audi supply.

    Cheers.
    #12
  13. docurley
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    docurley Moderator Staff Member Moderator

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    Audi is £40.69 +VAT

    Mine should be in on Saturday.
    #13
  14. Soupie69uk
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    Soupie69uk Owner

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    Cool, let us know how it is when fitted!!
    #14
  15. JayB5UK
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    JayB5UK Member

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    Been meaning to order a J version for a while now, my mate had good results after trying 3 different versions on his Jabba mapped Golf, although his is not DBW.

    Mine is DBW - engine cope APU - and is also re-mapped, anyone know if these are OK on DBW engines?

    Jay
    #15
  16. docurley
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    docurley Moderator Staff Member Moderator

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    Well I will be able to tell you on Sunday may be Saturday if me other half buggers off.
    #16
  17. Beerzo
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    Beerzo Masa'warty 3200... Talk To Me!

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    Based over in greenock. Took the kit off as the "amplifers" are sensitive to temperature and if they get too hot they burn out i am told. PLus this can lead to problems with your coil paks and stuff.

    Was told this by the guy that RR'd my car.

    May car doesnt feel any worse off after putting the air box back on. Saving for a Carbonio or a BMC. But still not sure what would happen to this amplifer thing once fitted.

    "amlifer" is the wee oval shaped metal bit that sticks in the top of the air box.

    As i say i am only repeating roughly what i was told.
    #17
  18. madkebab
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    madkebab Member

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    H valve for sale in the classifieds section
    #18
  19. RichA3Turbo
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    RichA3Turbo ...Watching you! Staff Member Moderator

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    I just had to replace my ignition control module. Remove this and you will get no spark.

    Rich
    #19
  20. Soupie69uk
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    Soupie69uk Owner

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    Did you get the N75J fitted Docurley?
    #20
  21. docurley
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    docurley Moderator Staff Member Moderator

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    Well Audi did not ring me Saturday to say my J vale was in so it did not go in but they rang this morning to tell me they forgot to ring and its ready for collection, so it will probably be next weekend before it goes in as I'm on lates this week.
    #21
  22. dummi
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    dummi smoking a6

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    i read about these a few years back on sport compact network forum , they're saying if you've remaped you don't need to do anything with the n75 as its action has been programmed for optimum by the tuner, its more of a bolt on if you aren't remaped, some of you guys are mapped before putting the j valve on has it made a difference to your boost? are you hitting limp mode?
    #22
  23. docurley
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    docurley Moderator Staff Member Moderator

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    #23
  24. JayB5UK
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    JayB5UK Member

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    [ QUOTE ]
    Someones point of view on the H valve.

    H valve review

    Here a install write-up.

    N75 install guide

    [/ QUOTE ]

    Makes interesting reading, food for thought.

    Have you installed your new one yet?

    Further to one of them guys' comments, mine is chipped, had a run out with my mate logging vag-com and it seems to be runnning at about 1 bar, but some days it just feels flat and gutless, and other times it feels bloody quick. Anyone else's car behave like that? I could understand it if it was the middle of summer, but in winter when it's nice and cold and the air is dense I wouldn't really expect such differences - always using Super Unleaded too...
    #24
  25. docurley
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    docurley Moderator Staff Member Moderator

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    Hoping to collect in Friday and depending on light get it in Friday too or its a Saturday morning Job.
    #25
  26. docurley
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    docurley Moderator Staff Member Moderator

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    Well the J is in and first thing I notice it that the car pulls a lot stronger to the point I notice I need bigger brakes.

    Next thing I notice is my Baileys DV is now silent and I mean silent!

    Only legged it up the road so I will post up more on Sunday.

    Just one thing, As I have read this goes in the opposite way to the original, am I correct.
    #26
  27. madkebab
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    madkebab Member

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    you are correct Doc
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  28. docurley
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    docurley Moderator Staff Member Moderator

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    So based on that my DV is nolonger venting!
    #28
  29. docurley
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    docurley Moderator Staff Member Moderator

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    Let me start again.






    /ubbthreads/images/graemlins/woohoo.gif

    What a Bloody difference and has to be a must for all 1.8T's this pulls harder and hold boost all the way to redline I have just realised how crap the brakes are under hard braking and with so much momentum.

    It's like someone just drop a bigger turbo in the car well worth the money and should be on the list of things to have done for Stage 1.

    I also do vent just under more boost as I discovered when I went out for a proper drive down the A2 last night. This is like a new car had a little tussle with a BMW 330ci that tried to leave me and I was sat all over his arse as he pulled from 40mph up to 80mph in short burst, he was not going anywhere without me. /ubbthreads/images/graemlins/grin.gif

    /ubbthreads/images/graemlins/dancing.gif /ubbthreads/images/graemlins/fuck_you.gif /ubbthreads/images/graemlins/MexWave.gif

    So if you have not put your order in for one by midway through this I suggest you do so now.
    #29
  30. Stringster
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    Stringster Missed gear

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    Putting my order in now...
    #30
  31. madkebab
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    madkebab Member

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    Nice one Doc. Been running my J valve for a year now so got used to the smoother and stronger power delivery. But I was just like you when I first installed it. Certainly the best mod for the money.

    Unfortuantely my boost seems to have fallen away lately. Checked all the hoses and replaced the DV but still the same. Only get about 10psi. I think the K03 might be on the way out but Im not using any oil. Could it possibly be the actuator rather than the turbo itself?
    #31
  32. Soupie69uk
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    Soupie69uk Owner

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    Cool cheers Doc.

    Why does the valve go in back to front?
    #32
  33. docurley
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    docurley Moderator Staff Member Moderator

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    [ QUOTE ]
    Cool cheers Doc.

    Why does the valve go in back to front?

    [/ QUOTE ]

    These where not made for our car and so was designed to flow in another direction and so we have to mount them with the plug pointing down so it flows correctly.
    #33
  34. Kevint
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    Kevint Active Member

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    Is there any benefit to be had fitting this to a standard 1.8T?

    Kev.
    #34
  35. docurley
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    docurley Moderator Staff Member Moderator

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    On another thread in tuning a guy has a rolling road results of 16bhp over standard with an induction kit which he was advised was causing loss of power.

    So based on that I would say it could be good for nearly 20bhp and in my chipped only car and then fitting the J valve as made a amazing difference to the power and would say its the cheapest power increase that you could spend.
    #35
  36. PhilR
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    PhilR One Ate Tea

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    This thread has definately given me food for thought. Im going to get mine chipped soon at Jabba. I wonder if i should install an N75j First or wait untill after ? Any ideas ?
    #36
  37. hop2407
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    hop2407 Active Member

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    [ QUOTE ]
    This thread has definately given me food for thought. Im going to get mine chipped soon at Jabba. I wonder if i should install an N75j First or wait untill after ? Any ideas ?

    [/ QUOTE ]

    Yeah me too matey, Me too. I've had mine chipped at Jabba and you wont be dissapointed - nice people down there. If your waiting whilst they do it, Enjoy the X-Box /ubbthreads/images/graemlins/laugh.gif.

    Reckon I'll have to look into it and consider replacing them....
    #37
  38. madvw
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    madvw Active Member

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    [ QUOTE ]
    This thread has definately given me food for thought. Im going to get mine chipped soon at Jabba. I wonder if i should install an N75j First or wait untill after ? Any ideas ?

    [/ QUOTE ]

    Always get your mods on first before remapping.
    #38
  39. docurley
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    docurley Moderator Staff Member Moderator

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    If jabba are going to map your car on the rollers then fit it first as they will take this in to account in the mapping to optimise your set-up. Plus he will give you a graph of before and after so we can analyse the power increase over standard with the J valve.
    #39
  40. PhilR
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    PhilR One Ate Tea

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    [ QUOTE ]
    [ QUOTE ]
    This thread has definately given me food for thought. Im going to get mine chipped soon at Jabba. I wonder if i should install an N75j First or wait untill after ? Any ideas ?

    [/ QUOTE ]

    Always get your mods on first before remapping.

    [/ QUOTE ]

    Thats what i first thought. But was thinking

    If a car is remapped to 1.0 bar with the n75 c valve and the j valve allows a higher boost level then if fitted after chipping the j valve will yeild power

    If its mapped to 1.0bar with the J valve thats the max power it will ever be

    Hope that makes sense
    #40

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