My 30 minute mod for the evening...BBK 70mm TB

Discussion in 'Generation 4 - Performance Upgrades' started by Ecoboost_xsport, May 27, 2020.

  1. Ecoboost_xsport

    Ecoboost_xsport SHO Member

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    So Lee at Ortiz Performance hooked me up on a VERY quickly shipped BBK 70mm TB. Been thinking bout this mod but was never 100% sure it fit until I came here. Anyway, got it and test fit it to the IM I have sitting on the bench I will be installing here shortly. Although it is an awesome piece, there were 2 small details my OCD had issues with. 1) I'll be porting the IM just that small bit to get it to match the TB, but have some concerns about how close it comes to the ring-style gasket groove if I do that and 2) the bolt holes where a bit larger than the hardware and just fit very sloppy. If you ever anted it dead-nuts centered, you'd kinda have to eyeball it and tighten it down. Well, I figured I'd address issue 2 tonight...

    I had some 5/16" OD 304 stainless tubing laying around and decided to see if there was any sort of "dowel" setup I could do. Lucky for me, the holes in the TB are EXACTLY 5/16". The OD of the tubing was soooooo snug (insert joke here). And the ID for the hardware sooooo perfect. So only problem was...the recessed holes in the IM weren't 5/16". Well, tubing was easy, measured what I needed and cut a few pieces on the lathe (you only need 2 to center). Unfortunately, the IM doesn't lend itself to be easily mounted on a table for a mill, so I had to do this one by hand...just took a 5/16" drill bit and sunk it in about 1/4"-3/8" deep.

    Slapped the dowels in place, and fit is perfection. No movement whatsoever, centered exactly to the opening of the IM (which I will now port to match) and all this with some extra tubing laying around and a quick turn of the lathe and some careful drilling. viola!

    Anyway, not a huge mod, but figured I'd share, lol. Xsports in the shop for awhile, so I can't do much to it and I'm drooling at all the work you guys are doing right now, haha...

    [​IMG]

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    SM105K, jtreber, Jordan_R and 2 others like this.
  2. Jordan_R

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

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    That's beautiful fitment. Great job
     
  3. FiveLeeter918

    FiveLeeter918 Ortiz Performance Sales Sponsoring Vendor Supporting Member

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    very cool! I completely forgot to mention the tediousness of getting it to not look off center, but this is a great idea.
     
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  4. Ecoboost_xsport

    Ecoboost_xsport SHO Member

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    Yeah, was thinking that BBK made those holes pretty large (5/16") for some hardware that is metric M6 I think. Pretty sloppy fit. Worked nicely with the dowels.

    Now I'd like to port the opening to IM to match the 70mm (its 68mm). It doesn't sound like much, but when I take my dial calipers to see how far it would go, it gets VERY close to that groove for the IM/TB gasket. If it doesn't cut into the groove, it may be pretty thin of an edge. Am I getting too deep into the woods trying to get that 2 mm so that its smooth? I'd like to port it, but if it gets into the area of the gasket, I may have to entertain the idea of making a flat gasket for it, which I'm on the fence about.

    Anybody port their IM to match the BBK? If so, how close was it to the gasket? Or am I just worried over nothing? lol
     
  5. FiveLeeter918

    FiveLeeter918 Ortiz Performance Sales Sponsoring Vendor Supporting Member

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    I just shipped my manifold out for porting. Once completed I'll post some pics. Was quoted $225 so we shall see how it does once the phenolic spacers are ready.
     
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  6. skyshadow07

    skyshadow07 On a mission to get below 4000lbs

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    Any idea on if the large TB is a power adder?
     
  7. FiveLeeter918

    FiveLeeter918 Ortiz Performance Sales Sponsoring Vendor Supporting Member

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    On its own I don't think it didn't much, maybe some throttle response. Combined with a ported manifold and spacer maybe.
     
    Last edited: May 30, 2020
  8. Ecoboost_xsport

    Ecoboost_xsport SHO Member

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    So I sprayed some layout fluid on the inside to see exactly how much would have to be trimmed off and it looks like pretty much the entire inside edge of the groove would have to go, which means, that area would be open to the inside of the IM and the gasket would likely get sucked into the intake track. Not to mention, if you went with a flat gasket of some sort, it would then leave that weird void where the original gasket went as an interrupted area (if that makes any sense)...

    [​IMG]

    So port-matching this thing is pretty much a no-go. A spacer of some sort going from 70mm down to 68mm would work, however. I got to thinking, that might actually be better as it would increase the velocity of the air (not by much, I know), which is usually ideal for flow.

    Anyway, was looking at some thin TB spacers, not for the silly snake-oil spirals that "promote air flow" or whatever, but simply as a medium to go from 68mm to 70 mm...unfortunately most of the TB spacers out there (05-10 V6 Mustangs will fit) don't advertise their I.D. dimensions...might have to machine one myself...

    ...or...maybe I'm getting too into the weeds on this one, lol...maybe just leave it alone? haha
     
  9. FiveLeeter918

    FiveLeeter918 Ortiz Performance Sales Sponsoring Vendor Supporting Member

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    You'd likely be better off starting with a block of aluminum and machining your own honestly.
     
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  10. Ecoboost_xsport

    Ecoboost_xsport SHO Member

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    Yeah, kinda was thinking this may be the route I have to go. Only reason I was looking at the various TB spacers out there was to see if their ID was smaller or equal to 68mm, I could use it as a starting point to port it from 68mm to 70mm instead of starting completely from scratch...
     
  11. Jordan_R

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

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    I think this is enough to keep me to buy one. Our piping goes from 2.5" to 3" to begin with. Thoughts? I am going to work on porting my manifold once I get some dremel bits in to continue further than the partial clean up I started today. I feel like you could thin the gasket lip ever so slightly around the edge, just "how much is too much." lol... Really an OEM manifold with another flange welded on could be a thing.... I mean it's all aluminum that is. Maybe something to think about is just yeeting off that opening and coming up with a custom one.
     
  12. Angrymongoose

    Angrymongoose SHO Member

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    Plus one for the yeeting. Followed by custom work.

    That does get pricey though.
     
  13. skyshadow07

    skyshadow07 On a mission to get below 4000lbs

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    Stupid question here, what model are you buying the TB for from BBK? I can only find 73mm 3.5 ecoboost TBs
     
  14. Ecoboost_xsport

    Ecoboost_xsport SHO Member

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    05-10 V6 Mustang
    [​IMG]
     
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  15. FiveLeeter918

    FiveLeeter918 Ortiz Performance Sales Sponsoring Vendor Supporting Member

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    ^ this. The F150 version does NOT fit.
     
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  16. skyshadow07

    skyshadow07 On a mission to get below 4000lbs

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    Well hell, that's how much Ford wants for one. Obviously go with the upgrade.
     
  17. Ecoboost_xsport

    Ecoboost_xsport SHO Member

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    That also means that TB spacers for the V6 mustang will also fit, if that is something that catches your fancy, lol
     
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  18. skyshadow07

    skyshadow07 On a mission to get below 4000lbs

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    Oh there is a can of worms..
     
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  19. Ecoboost_xsport

    Ecoboost_xsport SHO Member

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