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PORTED Throttle Body!?!

This is a discussion on PORTED Throttle Body!?! within the External Engine forums, part of the LSx Technical Help Section category; Is it a good mod? Any downsides? What kind of gains are possible along w/ these listed mods? SLP induction ...

  1. #1
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    00' Camaro SS/6spd

    PORTED Throttle Body!?!

    Is it a good mod?
    Any downsides?

    What kind of gains are possible along w/ these listed mods?

    SLP induction kit w/smooth bellows
    MSD wires
    NDK spark plugs
    3" Texas Racing X-Pipe
    3" bullet mufflers
    Hooker longtube headers w/ NO cats

    The car is a 00' 6 speed SS with just over 10,000 miles on it.

  2. #2
    Member homerunhtr21's Avatar
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    Artic White
    2002 Z28

    good mod , worth it, some see 7-10 hp and about the same torque.

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    Thanks for the input!

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    Junior Member blewbyu's Avatar
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    00 pace car
    chevy corvette

    Talking

    I just recieved mine Back from Mark Shaner ,Jam up Guy that does Great Work,I opted for the Polished + Ported for 159.00 ,Mark is a hoot to talk to You maybe able to reach him here http://www.s2performance.net/ ,

  5. #5
    old timer blue02Z's Avatar
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    yeah, i went over to mark's house and got mine, got a s3 polished. the difference was like day and night, like going from a 100 degree day to a 40 degree night highly recommended

  6. #6
    used and abused at wot ibanez7's Avatar
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    ported and polished throttle bodies are definitely worth it...

    however I can not see spending $150 on something i can do myself within 3hours.

    I ported and polished my own throttle body and a few friends throttle bodies. I used a variable speed dremel, and many various grits of sandpaper to polish the inside and outside.

    Also another throttle body mod to do, that improves HP is the bumpstop mod.
    It advances spark, increases fuel delivery and alleviates the throttle body blade from obstructing air flow.

  7. #7
    used and abused at wot ibanez7's Avatar
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    Also I would not waste $40 on the SLP smooth bellow.

    save that money for other mods.

    go to menards or home depot and by a 3.5"x3.5" black rubber Fernco tube.
    heat up the tube, trim it to fit and your down.

    the tube cost under $4.00

  8. #8
    used and abused at wot ibanez7's Avatar
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    in regards to HP gains.


    in ex:
    SLP LID
    ported TB
    bellow
    true dual exhaust no cats
    LT headers.


    honestly you will be around 30-40 rwhp... Each car is different some have been less and few have been more.

  9. #9
    no more 4th gen secondgearscratch's Avatar
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    i cant really see how porting a 78 mm throttle body out a bit will make much of a difference because i did it and it made no difference. even with "supporting mods" a pp throttle wont give you gains to write home about. for 150 bucks, id recommend concnetrating those funds into something worthwhile.

  10. #10
    Member ApexVIII's Avatar
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    1998 Camaro Z28

    ported TB is a good mod for the price, it helps alot with throttle responce
    M6, Lid, Ported and Polished Throttle Body (By Me!), LT, Custom Catted Y, Electric Cutout, PHB, LCA13.21@108 with a 2.3 60'

  11. #11
    used and abused at wot ibanez7's Avatar
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    a ported and polished TB, does it work or not.

    First off a ported and polished TB does not significantly increase the overall CFM of air into the intake manifold. Reason being is because porting and polishing a TB does not increase its overall intake bore size which is 78mm around the TB blade and so is the intake manifold. 78mm is just slightly over 3 inches. There are 25.4mm to 1 inch.

    so do not expect huge gains.

    What porting and polishing a TB does is promote more volumetric air (like a carb stack), less turbulence and less restriction on air flow. This does promote some increase in HP but not enough to warrant paying $150 for, when you can just do it yourself. The removal of inside material before the blade and polishing, promotes the above.

    Stock throttle bodies not ported or polished with stock ls6 intakes have performed great on 900rwhp twin turbo cars.

    definitely spend the $150 elsewhere, port and polish the TB yourself.

    Honestly the bumpstop mod is better mod then a ported/polished tb.

    however when racing every little bit counts.

  12. #12
    Member ApexVIII's Avatar
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    Quote Originally Posted by ibanez7 View Post
    a ported and polished TB, does it work or not.

    First off a ported and polished TB does not significantly increase the overall CFM of air into the intake manifold. Reason being is because porting and polishing a TB does not increase its overall intake bore size which is 78mm around the TB blade and so is the intake manifold. 78mm is just slightly over 3 inches. There are 25.4mm to 1 inch.

    so do not expect huge gains.

    What porting and polishing a TB does is promote more volumetric air (like a carb stack), less turbulence and less restriction on air flow. This does promote some increase in HP but not enough to warrant paying $150 for, when you can just do it yourself. The removal of inside material before the blade and polishing, promotes the above.

    Stock throttle bodies not ported or polished with stock ls6 intakes have performed great on 900rwhp twin turbo cars.

    definitely spend the $150 elsewhere, port and polish the TB yourself.

    Honestly the bumpstop mod is better mod then a ported/polished tb.

    however when racing every little bit counts.
    they dyno 8RWHP higher then an unported so i think
    ~150 its a good mod for the money

  13. #13
    Member 180ls1's Avatar
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    Quote Originally Posted by ApexVIII View Post
    they dyno 8RWHP higher then an unported so i think
    ~150 its a good mod for the money
    how much do you charge?

  14. #14
    Senior Member t-rock's Avatar
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    what about just the bump stop mod and dont you have to be careful or you will set off an ses light ?

  15. #15
    Member ApexVIII's Avatar
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    yea if you go past 90deg then it will set a ses light

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