Bbk throttle body

Discussion in 'Generation 4 - Performance Upgrades' started by SaveMelMac, May 3, 2019.

  1. Ecoboost_xsport

    Ecoboost_xsport SHO Member

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    Yeah, it's more like 63mm, just measured it...did you have to machine the manifold to "port match" the TB? 63mm to 70mm seems like a lotta meat to take off, and it seals with an o-ring type gasket, maybe cutting into the slot it sits in. Or did you just go to a flat gasket? Or did you not machine it at all? If not, seems like that "step" would cause flow issues.
     
  2. Wsho

    Wsho SHO Member Supporting Member

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    Well it couldn't hurt it was definitely an improvement on my older models SHO. Will find out once installed
     
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  3. mattr66

    mattr66 SHO Member

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    You need to machine the inlet to hold your clamp on otherwise it will blow off under boost.

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  4. skyshadow07

    skyshadow07 On a mission to get below 4000lbs

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    I thought this was already determined a useless mod?
     
  5. Wsho

    Wsho SHO Member Supporting Member

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    The clamps are welded onto the pipe and the throttle body and they're rated for 800 PSI
     
  6. mattr66

    mattr66 SHO Member

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    Sweet sounds like you got it then

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  7. ticoscen

    ticoscen Member

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    My BBK 1765 is ordered. Will install next week and report any nit noid issues I run into.
    The American Muscle TB is on back order still.
     
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  8. Ecoboost_xsport

    Ecoboost_xsport SHO Member

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  9. mattr66

    mattr66 SHO Member

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    Did they machine the inlet for retention under boost?

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  10. ticoscen

    ticoscen Member

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    Saw your dowel/locating pin approach. I have some custom fabrication on my car too in a few places and will show what I end up doing with the 70 mm throttle body mod. Good to know so I'm not surprised when I get in there. Transferring the servo guts over was straight forward, I take it (aside from the mechanical alignment stuff...)? I may port and polish the intake manifold mounting area with a dremel grinder to provide for better laminar flow between the TB and the manifold. EG: eliminate any square blunt edges that can cause vortex/turbulence issues on the outer boundaries. Particle mitigation rag will be installed, of course. .... You do an electronic ECU reset with the battery positive terminal removal and with a full capacitor discharge to get it to relearn? I'll measure the TPS voltage and reset that to the same voltage to reduce confusing the ECU.
     
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  11. Ecoboost_xsport

    Ecoboost_xsport SHO Member

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    You won't be able to port too much, the IM opening is about 68mm. But the oring seal/gasket is Very close to that lip. You can round it out a bit, but unless you want to go with cutting a flat gasket (not hard, I know, but still...) you're not getting much more opening with the IM.

    Stock butterfly is 65mm btw.



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    [​IMG]
     
  12. Ecoboost_xsport

    Ecoboost_xsport SHO Member

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    No..it's still flat for a hose and hose clamp. You're gonna have to weld your own wiggins-style clamp if you need that. That's what I'm about to do as mine has popped off once already

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  13. mattr66

    mattr66 SHO Member

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    Just machine it in a lathe... Plenty of meat.

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  14. Ecoboost_xsport

    Ecoboost_xsport SHO Member

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    Won't work unless you got some special tooling to get in between the gear housing...just look how it's manufactured.

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  15. mattr66

    mattr66 SHO Member

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    Can't chuck it from the inside?

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  16. Ecoboost_xsport

    Ecoboost_xsport SHO Member

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    Chucking it isn't the issue. Have you seen it?

    And there isn't enough meat to grind out a wiggins-style clamp connection.

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  17. Jordan_R

    Jordan_R Stock Block Ready To Knock...er..Rock

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    Pictures for reference but be pretty tight to machine but I've no experience in that
    IMG_20200727_150905.jpg
    What I did was get it welded. I know I put this elsewhere the other day lol
    IMG_20200728_175452.jpg
     
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  18. ticoscen

    ticoscen Member

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    Ok. Installed the 70mm TB. Easy to do. No problems. Used original screws. Mounts easy. Throttle response is smoother and more throaty. I don't get the whistleling/barking sound the smaller one used to do when throttling back at full boost. It would whistle/bark closing the butterfly in the high velocity stream. The lower velocity air going through a bigger hole will make for better laminar flow. Whomever thinks this is NOT a worthwhile upgrade is not thinking straight.
     
  19. ticoscen

    ticoscen Member

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  20. stripSHO

    stripSHO Tyler Durden

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    Glad you're satisfied and enjoy the sound differences. But from an actual performance standpoint I can't see there being any benefit to anyone except maybe those who are FBO with turbos. Pressure drop across the oem TB is non-existent, and I don't actually even run true WOT until >4500 rpm. Furthermore I would suspect that being larger than the intake opening actually creates more turbulence as I'm gathering there becomes a hard ridge exposed the circumference. That throatier sound is just the larger low pressure "wake" area behind the throttle blade due to size and the simple fact that it runs less angle to achieve the same engine load at low-to-mid rpm.

    Theory talks, but performance walks. Let's see some real world drops in e.t. or gains on the dyno. Until then, I'm with skyshadow on this one. Here's manifold pressure vs throttle inlet pressure from one of my logs. I have a couple hundred more of these that all show the same perfect overlay between the two:
    upload_2020-11-21_9-7-59.png
     
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