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Throttle body

Discussion in 'VN - VP Holden Commodore (1988 - 1993)' started by 38VNIT, Jul 19, 2006.

  1. 38VNIT

    38VNIT Azerium

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  2. 1991_Vn2nV

    1991_Vn2nV New Member

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    Its not bad for the Yella Terra one. Sometimes the 70mm throttle bodies go for around $200 even on Ebay..
     
  3. YMY-88U

    YMY-88U New Member

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    yeah and some people are getting rid of v8 ones for $195
     
  4. PaRaDoX

    PaRaDoX Because Racecouch...

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    lol @ 10 rear wheel kw

    lol silly trevor listing performance gains...

    anyway this shop is awesome, they do our group buys, they're located in hallam, brought alot of things from then and WOULD buy from them again, good to deal with and cheap prices :)
     
  5. cbb01

    cbb01 New Member

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    yeah why pay $195 for V8 which is only 65mm
    when for an extra $70 you can get NEW yella terra at 70 mm

    I went the yella terra for the extra money.
    i was told to be careful with an auto aswell but no problems at all.
    I LOVE THE BIGGER THROTTLE BODY
    better pull off the line.
     
  6. 1991_Vn2nV

    1991_Vn2nV New Member

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    You can pick up V8 throttle bodies from wreckers for alot less than $195 though.

    The Yella Terra 71mm throttle body is a good buy though
     
  7. anton1o

    anton1o [GMHVN6]

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    65mm sells for 100$ check the mods thread for prices.
     
  8. CSL

    CSL Member

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    yeah that shops tiptop, ive purchased my intake pipe, exhaust and springs/shocks all at real nice prices.
    if anyone is interested i have a big bore (69.7 i think) throttle body here for sale, 70 bucks, i bored it myself but went .2 over in the bore, so the butterfly does not make a complete seal. it's untested but i'm sure it would still work, steel butterfly. i'll get some pics up soon. pm me if interested
     
  9. Wesleyrpg

    Wesleyrpg Member

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    i'd hate to upset you guys, but i have run 60mm, 65mm and 70mm Throttle bodys on the dyno run after run and it makes no difference to the power at all!!!!!! No gains, no losses, well the only loss is vacumn pressure.
     
  10. 1991_Vn2nV

    1991_Vn2nV New Member

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    Well other people have had gains on dyno's with larger throttle bodies and everyone notices a difference. They DO make a difference...
     
  11. anton1o

    anton1o [GMHVN6]

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    exactly, freind made 97rwkw with cai&v8 tb.
     
  12. stockvp

    stockvp New Member

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    if ya got a series 2 just take out the plastic bellmouth out in between the inlet manifold and throttle body this you will definitely notice even without upgrading the throttle body
     
  13. greenfoam

    greenfoam New Member

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    But what did he make before the CAI and TB on the same dyno on the same day, because plenty of VNs and VP have pulled 105 rwkw dead stock. The stock V6 can only breath about 380cfm of air. The stock TB flows almost 500cfm. Where's the extra power come from?:)
     
  14. 1991_Vn2nV

    1991_Vn2nV New Member

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    I dunno if this is right or not.. But isnt that because it only sucks in air every second rev as is a 4 stroke?

    The throttle body is capable of almost 500cfm at a constant flow rate, but the engine is capable of well over 600cfm at a constant flow rate, its just that the engine only sucks in air every 2nd rev... But effectively, it is being restricted by the throttle body?
     
  15. CSL

    CSL Member

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    i dont think power can be made, the difference your feeling is all response, and they aint nothing wrong with that
     
  16. 1991_Vn2nV

    1991_Vn2nV New Member

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    Cubic Feet per Rev is perhaps a better measurement than cubic feet per minute as the engine only sucks in air every second rev, so after alot of calculations I managed to get the following figures & a headache:

    3.791L = 0.13386021 cubic feet per rev maximum

    63mm Throtte Body = 0.0882915957 cubic feet per rev...

    71mm Throttle Body = 0.1263783741 cubic feet per rev...

    But I believe after the throttle body it is restricted to 68mm at some point, so a 71mm throttle body is only going to get as much as a 68mm throttle body...

    68mm = 0.1110259392 cubic feet per rev...

    So I THINK they are the max flow rates for the throttle bodies, in comparison to the max flow rate for the engine. But there would be more air in the engine past the throttle body too, so the actual amount of air that the engine sucks in is higher than the max flow rate of each throttle body... But the point is a larger throttle body DOES help.
     
  17. stocky

    stocky New Member

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    i wonder what the surface area of the TB opening is like compared to the original intake or the neck of the VS CAI
     
  18. greenfoam

    greenfoam New Member

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    Do all the crazy sums you want :) I'll try find you a calculator.

    Ok something like this

    http://www.4secondsflat.com/Carb_CFM_Calculator.html

    The stock V6 has a VE of about 85% and peak revs no more than 5500

    Going from a 65 mm throttle to a 70 on the 304 does give you a little 5-10rwkw increase (only in the very last 1-2000 revs) on a semi worked motor but that's an engine that breaths ALOT more air than the V6
     
  19. greenfoam

    greenfoam New Member

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    The CAI can flow to about 170rwkw? as seen in a certain supercharged UC hatchback :)
     
  20. 1991_Vn2nV

    1991_Vn2nV New Member

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    Bah each to their own :p

    I believe it makes a difference and I believe cubic feet per rev is a better way of measuring it, you believe it doesnt make a difference and that cubic feet per minute is better way of measuring it... Im not disputing the calculator because its obviously correct... Yes the engine needs 318.629 cubic feet per minute flow. But the engine only sucks in air every second rev, so I think measuring it by the amount of cubic feet of air it needs each time it sucks in compared to what the throttle body allows is a better way of measuring. But its just a difference in opinion :p
     

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