Twin COMP 5858's for rear-mount build
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2004-2007 Cadillac CTS-V Performance Mods Discussion, Twin COMP 5858's for rear-mount build in Cadillac CTS-V Series Forum - 2004 - 2007; I've been wanting to do a twin turbo build for some time now and i've done just about all the ...
  1. #1
    lilgCTS-V is offline Cadillac Owners Enthusiast
    Automobile(s): 06CTS-V BOLT-ON,06JEEP TJ BUILT, 91 350SDL turbo(daily)
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    Twin COMP 5858's for rear-mount build

    I've been wanting to do a twin turbo build for some time now and i've done just about all the research i could do, the only thing i really need help with is choosing the right turbo chargers. I thought about doing some CX racing GT35 turbo's because they seem to work but i feel going with a quality turbo will yield a better result. I was thinking of OIL-LESS COMP 5858 ball bearing turbo's, any expert opinions would be great !

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    http://www.compturbo.com/products/ct2billet/ct2_5858

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  3. #2
    runsfromdacops is offline Cadillac Owners Fanatic
    Automobile(s): twin turbo rear mount V1 CTS-V built 383. 875/860RW pump/met
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    I have pte billet 5858s with S cover and v-band .82 ex housings on my rear mount setup.

    Seems to be a geat combo for my car.
    lilgCTS-V and lilgCTS-V like this.

  4. #3
    lilgCTS-V is offline Cadillac Owners Enthusiast
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    Re: Twin COMP 5858's for rear-mount build

    What are you spooling at ?

  5. #4
    VincentT is offline Cadillac Owners Member
    Automobile(s): 2004 CTS-V
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    Re: Twin COMP 5858's for rear-mount build

    Kinda depends on your goals, but for the amount of boost that stock heads can handle, 5858's are right in line with what I've researched.

    Edit: Not having compressor maps to look at makes this kind of stuff hard.

  6. #5
    madramper is offline Cadillac Owners Member
    Automobile(s): 2004 CTS-V
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    Re: Twin COMP 5858's for rear-mount build

    I went with www.workturbochargers.com. Give him a call and he will build you exactly what you need. He takes the guess work and worry out of the large purchase. I wound up with a pair that I never would have considered on my own. He said I should have boost by 2200 rpms and they are good for 1000hp.
    lilgCTS-V and lilgCTS-V like this.

  7. #6
    runsfromdacops is offline Cadillac Owners Fanatic
    Automobile(s): twin turbo rear mount V1 CTS-V built 383. 875/860RW pump/met
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    Quote Originally Posted by VincentT View Post
    Kinda depends on your goals, but for the amount of boost that stock heads can handle, 5858's are right in line with what I've researched.

    Edit: Not having compressor maps to look at makes this kind of stuff hard.
    Well im making 876/860 on a 383 and not running out of turbo yet. I think they are a little on the big side for a stock motor.I think they are going to give up right at 1kwhp

  8. #7
    robojesus is offline Banned
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    Re: Twin COMP 5858's for rear-mount build

    wow, you're only able to make 1,000 rear wheel with your rear mounts... it must be hard being you.

    (consider me thoroughly jealous)

  9. #8
    HAMSTAR is offline Cadillac Owners Enthusiast
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    Re: Twin COMP 5858's for rear-mount build

    Why isn't anyone here considering a single, smaller turbocharger that could net a yield like a maggie?

  10. #9
    RyRidesMotoX is offline Cadillac Owners Enthusiast
    Automobile(s): 2004 CTS-V Raven, StainlessWorks header back exhaust
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    Quote Originally Posted by HAMSTAR View Post
    Why isn't anyone here considering a single, smaller turbocharger that could net a yield like a maggie?
    A turbo is like a hooker.... Why have one when two is always better.
    lilgCTS-V and lilgCTS-V like this.

  11. #10
    VincentT is offline Cadillac Owners Member
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    Re: Twin COMP 5858's for rear-mount build

    Quote Originally Posted by runsfromdacops View Post
    Well im making 876/860 on a 383 and not running out of turbo yet. I think they are a little on the big side for a stock motor.I think they are going to give up right at 1kwhp
    Any reliability issues with that stroker?

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    Quote Originally Posted by RyRidesMotoX View Post
    A turbo is like a hooker.... Why have one when two is always better.
    Turbos are like hookers? You mean many of them are under age and forced to work under threat of death at the hands of a pimp?

  12. #11
    lilgCTS-V is offline Cadillac Owners Enthusiast
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    Re: Twin COMP 5858's for rear-mount build

    im throwing around doing a single 76mm comp oil-less to to maybe keep costs down but i dont want an on off switch meaning i dont want to have alot of lag then a tone of power my cuzins skyline is like that and although cool it wasnt easy driving a right hand drive car in stick, i dont want to boost to fall off then have to respool

  13. #12
    VincentT is offline Cadillac Owners Member
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    Re: Twin COMP 5858's for rear-mount build

    How much engine work are you planning on?

  14. #13
    lilgCTS-V is offline Cadillac Owners Enthusiast
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    Re: Twin COMP 5858's for rear-mount build

    well i never had the money to do a build being a broke college student but now that im going to be working full time i might just go balls the the wall, my mentality is yea i could buy a new v2 or something like that or i can do something really really cool,,, to answer your question i want to do 80 lb injectors and a fuel pump and run up 8-10 psi on a stock motor with meth, if it lasts then god bless the stocker but if it lets go i will go iron block.

  15. #14
    VincentT is offline Cadillac Owners Member
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    Re: Twin COMP 5858's for rear-mount build

    I'm mainly asking because the stock block only takes 4 bolt per cylinder heads, which probably would only take about 15 psi without taking risks of lifting. I don't think you really need a 76mm turbo to get 15 psi (any experts, feel free to correct me). It will take a little longer to spool up, and once it has spooled, you quickly have to start draining a lot from the waste gate because you'll be pushing too much air. If you go with slightly smaller, around 70 mm, you should spool a little faster and start hitting 15 psi at an earlier RPM range without having to drain off as much through the waste gate as early on.

    I welcome correction from anyone on this because I'm still working it out as well.

  16. #15
    lilgCTS-V is offline Cadillac Owners Enthusiast
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    Re: Twin COMP 5858's for rear-mount build

    i think the problem with a 70mm would be that it would "run out of breathe" and i dont know if it would push enough CFM's

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