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This is a discussion on STi with an 18g is SICK within the STi Engine Performance forums, part of the STi Technical Forum category; Just wait till you get EM and race gas...

  1. #46
    Registered User WRXcelration's Avatar
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    Just wait till you get EM and race gas
    05 STI

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  3. #47
    Registered User STi_This's Avatar
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    Quote Originally Posted by WRXcelration
    Just wait till you get EM and race gas
    The EM will never be. I have no need for it. Been their, done that. Check my signature.
    STi_This = Brian
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  4. #48
    Registered User kool168's Avatar
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    i am thinking to get 18G with TD06 from deadbolt, do i need to upgrade fuel pump and injectors? i have UTEC and TBE in my car right now.

    where do you guys get your 18G?

  5. #49
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    Quote Originally Posted by kool168
    i am thinking to get 18G with TD06 from deadbolt, do i need to upgrade fuel pump and injectors? i have UTEC and TBE in my car right now.

    where do you guys get your 18G?
    If you are at or near sea level I would HIGHLY recommend a fuel pump (GSS342) and in jectors to go along with it. Honestly if I had it to do over again I would definitl go with the TD06-18G instead of the TD05H-18G.

    We get our turbos from TEC (turboengineering.com) - great quality along with being oil and water cooled. They have built me 2 TD05H-18G and a TD06H-20G.
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  6. #50
    Registered User STiLL WILL's Avatar
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    I don't know whether to choose Deadbolt's TD06-18G or TD06-20G. I am damn near sea level(+/- 14 feet above). I have a fuel pump sitting in my room and I am about to make my move on injecors. My main concern is the additional stress on the motor with the 20G. My tuner tells me that with a good tune, the 18G will not subject the stock motor to any SERIOUS additional stress, but I have yet to e-mail him about the 20G. What do you guys think...I don't want to sacrifice spool up(loosing a couple hundred rpms of spool up I CAN live with), but I also want great top end WITHOUT having to step up to a SuperZilla/Green.

    I've heard Jerry say weird things happen boost wise mating the TD06 turbine with the 18G compressor, what these "weird things" are I have yet to inquire about...so that's why I am a little reluctant on doing that combo. It looks like the 20G will be the best for what I want, but I want my motor to last me and be reliable with the 20G. I am having Dan Harman tune my next set up, as he has already tuned my STi with the UTEC, so I know it'll be a good tune. Again, my main concern is reliability of the stock motor EVEN on a good tune with the 20G. Since we get crap 91 octane, I would assume that my daily driver map would not have boost levels over 21-22 psi. I know when upgrading to much more substantial turbo's you give and take, I just want a good balance in between....decent spool time + substantially more top end than stock + daily driver reliability.

    Help a newbie out!!!

  7. #51
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    Personally I would shoot for a larger turbo with a bit more potential reason being you don't HAVE to tune it out to a huge boost number for high hp. You could get something like a 50Trim/Green and run RIGHT in the sweet spot in the high teens of boost.

    You aren't going to see a huge difference in spool difference between a TD06 and TD06H wheel. I would suggest getting AT least a TD06H-20G at the minimum. Go with the Superzilla if you want a bit more topend without any extra lag. Remember about 90% of the spool characteristics come from the properties of the hotside (a/r of the exhaust housing and the mass of the exhaust wheel/shaft).
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  8. #52
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    my buddy has teh 20g superzilla and its amazing. but he does have the utec and its tuned...

  9. #53
    Registered User pace's Avatar
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    Quote Originally Posted by STi_This
    Nate, I thought you only had a 16g under the hood of that EVO?
    Not wanting to start an Evo versus your-modified-STi flamewar, but everything I've found suggests that the compressor on Nate's 16G (and every other stock Evo) flows very close to that 18G. The OE Evolution turbo is a little bit special - it is not a standard 16G.

    -pace

  10. #54
    Registered User kool168's Avatar
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    Quote Originally Posted by davidm_sh
    If you are at or near sea level I would HIGHLY recommend a fuel pump (GSS342) and in jectors to go along with it. Honestly if I had it to do over again I would definitl go with the TD06-18G instead of the TD05H-18G.

    We get our turbos from TEC (turboengineering.com) - great quality along with being oil and water cooled. They have built me 2 TD05H-18G and a TD06H-20G.
    i didn't want to touch the fuel pump and injectors, that's why i was planning the 18G. if i wanna go to get TD06 20G instead. what kinda injectors will be good and in reasonable price?

  11. #55
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    Quote Originally Posted by kool168
    i didn't want to touch the fuel pump and injectors, that's why i was planning the 18G. if i wanna go to get TD06 20G instead. what kinda injectors will be good and in reasonable price?
    I can't speak first hand about sea level but from what I understand the stock turbo is able to max out the stock fuel system at sea level. So an 18G would EASILY beable to completely out drive it I would think. The stock VF39 flows around 450-460cfm peak while the 18G can deliver up to 600cfm peak. 20G is about 650-675cfm peak.
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  12. #56
    Registered User kool168's Avatar
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    Quote Originally Posted by davidm_sh
    I can't speak first hand about sea level but from what I understand the stock turbo is able to max out the stock fuel system at sea level. So an 18G would EASILY beable to completely out drive it I would think. The stock VF39 flows around 450-460cfm peak while the 18G can deliver up to 600cfm peak. 20G is about 650-675cfm peak.
    i always hear the word sea level, how does it relate to the turbo?

  13. #57
    Moderator YBNormal07's Avatar
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    Quote Originally Posted by kool168
    i always hear the word sea level, how does it relate to the turbo?
    Closer to sea level, the air is more dense. More dense air = better performance from the turbo. Higher up from sea level, less air for the compressor wheel to pack into the engine.
    tEh PriUs=teH faSTah!@@!
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  14. #58
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    Quote Originally Posted by kool168
    i always hear the word sea level, how does it relate to the turbo?
    just do a search for my username and/or username 'hotrod' on this board with the word elevation. It will tell you everything and probably MUCH more than you ever wanted to know in regards to that question .
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