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  1. #1
    Senior Member Three Rings Bob Marley's Avatar
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    SRM K24 Wastgates...

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    Just started tuning w/Blake on New setup K24s(JB)

    Starting to have some boost oscillation issues north of 25psi slowing down the tuning process.



    These are NOT 1 Bar watsegates unfortunately...

    I was only able to achieve about 9psi cracking pressure when setting these up some time ago... one actuator was binding on compressor housing as well

    ...bracket needed to be bent a bit

    Wastgate lines are New and Double clamped

    Blake suggested replacing N75.

    In the meantime I swapped in my GrimmSpeed MBC and took a log just to see the difference in boost curve up top...

    This is with a MBC



    Wondering if anyone has had similar issues... I really ...really would hate to have wastegate issues with SRM after install. Upgraded Tials WGs were announced a couple weeks after I bought these turbos.
    Last edited by Bob Marley; 07-12-2018 at 09:24 AM.

  2. #2
    Veteran Member Four Rings vavJETTAw36's Avatar
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    Quote Originally Posted by Bob Marley View Post
    Just started tuning w/Blake on New setup K24s(JB)

    Starting to have some boost oscillation issues north of 25psi slowing down the tuning process.

    Sent from my SM-N950U using Tapatalk
    I think you have two options. Better waste gates or a tuner willing to put in the time to smoothen the boost out.

  3. #3
    Veteran Member Four Rings vavJETTAw36's Avatar
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    oh, also I failed to mention that my gates are set to 15PSI and I had the exact same trouble early stages of tuning. Brad worked through it and got it pretty smooth. I will post some logs later.

  4. #4
    Senior Member Three Rings Bob Marley's Avatar
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    Quote Originally Posted by vavJETTAw36 View Post
    oh, also I failed to mention that my gates are set to 15PSI and I had the exact same trouble early stages of tuning. Brad worked through it and got it pretty smooth. I will post some logs later.
    Yeah.... ...that's why I don't want to go bananas.... ...but Blake has already tried several revisions in attempting to smooth it out.

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  5. #5
    Veteran Member Four Rings vavJETTAw36's Avatar
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    Quote Originally Posted by Bob Marley View Post
    Yeah.... ...that's why I don't want to go bananas.... ...but Blake has already tried several revisions in attempting to smooth it out.

    Sent from my SM-N950U using Tapatalk
    So what now, he is just quitting on you? Or are you not comfortable discussing this with him?

  6. #6
    Veteran Member Four Rings
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    Honestly with the fact that these larger turbos are less trigger happy than little k04s, a manual boost controller is not that bad of a thing.

    Blake had some issues with mine spooling much faster than expected, and it took a few attempts to get the initial spike under control... In the end it was a tradeoff of rapid spool VS better control. If I want that fast spoolup again at the cost of potential part throttle overboosting, I can just slap my old brass boostvalve.com grainger valve in. :)

  7. #7
    Senior Member Three Rings Bob Marley's Avatar
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    Boost Curve with MBC



    Boost Curve with N75


  8. #8
    Veteran Member Four Rings vavJETTAw36's Avatar
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    Quote Originally Posted by Bob Marley View Post
    Boost Curve with MBC



    Boost Curve with N75

    You probably want a MBC in parallel with the N75. (if you're gonna run one). Plug/Cover the purge hole on the MBC (if applicable)

  9. #9
    Veteran Member Four Rings CELison's Avatar
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    Easiest thing to do is swap another n75 and see if it makes a difference.
    B5 S4- K24s, built bottom end, E85
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  10. #10
    Veteran Member Three Rings
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    MBC on ME7......lol@you...

    I said it countless times since the chicom knock off turbos have hit the market several years ago, the wastegates were, are and always will be total crap, fact not fiction..for one that works you have 10 that dont.....either pony up for Tial/Turbosmart or similar or live with band aiding them........the usual suspects of course will peddle in with but but but but 2.7 fats, hanging with Aventador's and other associated non sense.

  11. #11
    Senior Member Three Rings Bob Marley's Avatar
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    Quote Originally Posted by Drehmoment View Post
    MBC on ME7......lol@you...

    I said it countless times since the chicom knock off turbos have hit the market several years ago, the wastegates were, are and always will be total crap, fact not fiction..for one that works you have 10 that dont.....either pony up for Tial/Turbosmart or similar or live with band aiding them........the usual suspects of course will peddle in with but but but but 2.7 fats, hanging with Aventador's and other associated non sense.
    Thanks for the input.... MBC was installed as a quick test for troubleshooting purposes only... ...don't plan on running it...

    Yes these wastegate are crap

    Coming from BW K04s the diffence is clear

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  12. #12
    Veteran Member Four Rings CELison's Avatar
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    Quote Originally Posted by Drehmoment View Post
    MBC on ME7......lol@you...

    I said it countless times since the chicom knock off turbos have hit the market several years ago, the wastegates were, are and always will be total crap, fact not fiction..for one that works you have 10 that dont.....either pony up for Tial/Turbosmart or similar or live with band aiding them........the usual suspects of course will peddle in with but but but but 2.7 fats, hanging with Aventador's and other associated non sense.
    Right, so 92% don't work. Makes sense. I guess I'm the lucky 1 in 11 according to your data there. Are there better options? Of course. Do most of them have issues like this? No.
    B5 S4- K24s, built bottom end, E85
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  13. #13
    Senior Member Four Rings
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    There's always a pair of adjustable/rebuild-able WGA with better springs. The MBC with the N75 is not a bad idea, yes, a good tuner can bang this out perfectly, but for the time being its a safety backup. I ran the Boost Machine with the stage 3++ I had on my swap. It was there mostly to smooth out the signal to the actuator and held boost more in a linear way than rather up and drop.

    I say also try the Evo crushed DVs instead of the ones on there now. I will be getting one for the 1.8t and see how the 22+ boost will act between shifts.


    E

  14. #14
    Senior Member Four Rings
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    Quote Originally Posted by Drehmoment View Post
    MBC on ME7......lol@you...

    I said it countless times since the chicom knock off turbos have hit the market several years ago, the wastegates were, are and always will be total crap, fact not fiction..for one that works you have 10 that dont.....either pony up for Tial/Turbosmart or similar or live with band aiding them........the usual suspects of course will peddle in with but but but but 2.7 fats, hanging with Aventador's and other associated non sense.
    True. I would love to see a hybrid system with ball bearings and proper WG. For me is not so much the size, but the loss of boost.

  15. #15
    Veteran Member Four Rings
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    Ignore that bozo. I don't think he even owns a car.

  16. #16
    Senior Member Four Rings
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    Quote Originally Posted by Drehmoment View Post
    MBC on ME7......lol@you...

    I said it countless times since the chicom knock off turbos have hit the market several years ago, the wastegates were, are and always will be total crap, fact not fiction..for one that works you have 10 that dont.....either pony up for Tial/Turbosmart or similar or live with band aiding them........the usual suspects of course will peddle in with but but but but 2.7 fats, hanging with Aventador's and other associated non sense.
    Meh. SRM gates, check. Stock MAP sensor that's well outside it's limit, check. MBC, check.

    Car runs and drives great, and has put up results I expected. Maybe one of these days I'll buy a new map sensor and let the ECM do it's thing, but the current setup works just fine.
    Stock engine with some rods tossed in. 11.25@132mph.

  17. #17
    Veteran Member Four Rings
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    Yup. meanwhile those of us with fast cars, continue to have fast cars...

  18. #18
    Veteran Member Four Rings CELison's Avatar
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    Quote Originally Posted by S4James View Post
    Yup. meanwhile those of us with fast cars, continue to have fast cars...
    My car is running great with it’s SRM 1 bar wastegates. How about yours?

  19. #19
    Veteran Member Four Rings
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    Quote Originally Posted by CELison View Post
    My car is running great with it’s SRM 1 bar wastegates. How about yours?
    Also great.. ran a train on a 500whp turbo bmw on friday.. You?

  20. #20
    Senior Member Three Rings slowSfaux's Avatar
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    My car has srm 1bar gates too, and I've had no problems with them.

    Maybe it's the new wastegates that have the 91% defective rate?

  21. #21
    Veteran Member Four Rings
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    The only defective thing is that guys brain... Bob, your log on the MBC looks like either bad n75 or something weird with the tune... The coils in those solonoids dont last forever, they tend to build up resistance and go out of spec, this can cause them to act all kind of fucky.. So take blakes advice on this one... Dont get frustrated, it looks like you are getting close.

  22. #22
    Veteran Member Three Rings
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    Quote Originally Posted by S4James View Post
    Ignore that bozo. I don't think he even owns a car.
    Oh hurt your Chicom feelings again, Jenny?

    Hurry, the bus is waiting for your trip to the border with your P hat “No wall” sign , you go girl and “Resist”

  23. #23
    Veteran Member Four Rings CELison's Avatar
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    Quote Originally Posted by Drehmoment View Post
    Oh hurt your Chicom feelings again, Jenny?

    Hurry, the bus is waiting for your trip to the border with your P hat “No wall” sign , you go girl and “Resist”
    Question. When you sleep, do you leave the dildo in your ass or do you pull it out and put it in a glass of water next to your bed like dentures?
    B5 S4- K24s, built bottom end, E85
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  24. #24
    Veteran Member Three Rings
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    Quote Originally Posted by CELison View Post
    Question. When you sleep, do you leave the dildo in your ass or do you pull it out and put it in a glass of water next to your bed like dentures?
    Usually inserted in your mouth, too big for you ?

  25. #25
    Veteran Member Four Rings
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    Probably uses barbasol, for that extra tingle.

  26. #26
    Established Member Two Rings
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    I realy don't understand why you do not like to talk about srm issues. There are some topics refering srm wastegates being bad, some had to adjust the adjustment screw all way to get some boost, even srm admited the problem and now they are sold with diferent actuator.

  27. #27
    Veteran Member Four Rings
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    There is a difference between rational discussion of parts and real failure rates, and some name calling idiot with an unhealthy obsession. Although in this case it doesnt look like there is an issue with the wastgates.

  28. #28
    Established Member Three Rings
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    Quote Originally Posted by Drehmoment View Post
    Oh hurt your Chicom feelings again, Jenny?

    Hurry, the bus is waiting for your trip to the border with your P hat “No wall” sign , you go girl and “Resist”
    Wtf??? Somebody must have some real problems if you get that bent

    Sent from my SM-N950U using Audizine mobile app

  29. #29
    Established Member Three Rings
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    Quote Originally Posted by CELison View Post
    Question. When you sleep, do you leave the dildo in your ass or do you pull it out and put it in a glass of water next to your bed like dentures?
    Oh my God. You 2 are hilarious....

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  30. #30
    Established Member Three Rings
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    Quote Originally Posted by Drehmoment View Post
    Usually inserted in your mouth, too big for you ?
    It just doesnt stop. Kinda ridiculous. Kinda like quoting 3 post that absolutely have nothing to do with the thread at all.

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  31. #31
    Registered Member Three Rings
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    Drehmoment pretty much lays waste to these discussions...

  32. #32
    Veteran Member Four Rings
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    Get the admins in here to clean up this mess. Guys have been ip banned for far less.


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  33. #33
    Veteran Member Four Rings FlyboyS4's Avatar
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    Quote Originally Posted by Bob Marley View Post
    Wondering if anyone has had similar issues... I really ...really would hate to have wastegate issues with SRM after install. Upgraded Tials WGs were announced a couple weeks after I bought these turbos.
    Typically I would not expect 9 psi of preload to be sufficient to hold over 27 psi, but perhaps with the rs6 hotside that comes into play. Clearly with the MBC you are getting there so the drop off with the N75 in use isn't caused by the wastegates. If tuning efforts on the wgdc haven't improved things and you are on an old N75 that seems like an easy and relatively inexpensive swap to make to see what happens.
    Stock -> APR Stg1/2 -> GIAC Stg2 -> K04 -> 605 -> F4H -> K03 -> K04 -> F21MF -> TTE550 -> K04 -> TC Stg1 -> BW RS6 & TiAL 605 & FT F21v3 (On deck)
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  34. #34
    Veteran Member Four Rings
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    wait.. is he still on 9psi preload?

  35. #35
    Senior Member Three Rings Bob Marley's Avatar
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    Quote Originally Posted by S4James View Post
    wait.. is he still on 9psi preload?
    Yep... any more and the flapper wouldn't open all the way. These aren't 1 Bar gates

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  36. #36
    Veteran Member Four Rings
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    oh ffs... thats a problem.... Thats simply going to be hard to control at high boost with an n75. Dont know what the best advice is.. You could try a set of helper springs... it can be done without pulling the motor down, but the best solution may be to drop the subframe and get some better wastegates...

    The 1bar at a minimum, the tials would be better..

    What does blake have to say on this?

    Also... If the manual works for you, why not just run that? I ran a stage3 for years with one and i was perfectly happy with it.



    I wish i could give you advice im 100% confident in, but none of those solutions come without comprimise...

  37. #37
    Senior Member Three Rings Bob Marley's Avatar
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    Is there away to replace the wastegetes without pulling motor...? I ...really ...really don't want to do that again for the year.... My shop/backyard is closed for the summer lol

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  38. #38
    Senior Member Four Rings christianb5s4's Avatar
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    You could support the motor and drop the subframe but at that point it's easier to just pull the motor. I know that's not what you want to hear, I was in your position with 3 motor pulls during my build. One for the actual build, one because one o-ring on the turbo oil supply distribution T leaked, and the final one because one of the freshly rebuilt RS6 turbos took a crap.
    Imola 2001 Stage 3 S4: 312K - 2.4sec FATs - Completely Refreshed/Built Motor - SRM K24s w/ Custom Turbosmart wastegates - Clutchmasters Stage 4 - Etspec - Cinesnow WG/Oil Lines - SRM V3 Intercoolers - AA built trans - 4:1 Diff - JHM Trio - 034 - H&R Coilovers - FCP - Bosch Motorsports - OZ Racing - SRM/SSAC exhaust - Tons of New OEM parts

  39. #39
    Veteran Member Four Rings NOTORIOUS VR's Avatar
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    Quote Originally Posted by Bob Marley View Post
    Boost Curve with MBC



    Boost Curve with N75

    Well it's obvious that it's not a WG issue if the MBC is able to hold the boost steady after the spike.
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  40. #40
    Senior Member Three Rings Bob Marley's Avatar
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    Quote Originally Posted by NOTORIOUS VR View Post
    Well it's obvious that it's not a WG issue if the MBC is able to hold the boost steady after the spike.
    Yes... I know.. showed to Blake and he feels it's not smooth to his liking with the MBC... he feels the Wastegates are touchy.

    Are they worth the trouble of replacing just for this...? I dont think so

    ...i'm going to replace the N75 and run the MBC in parallel to Smooth out the spike and leave it...

    ...i'm building @27psi by 4500 and holding to redline...& we haven't even started tuning in Meth yet so I guess I cant complain.

    It is what it is

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