D-series Throttle Body sizes

D15, D16, D17 and Mini-Me swaps
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D-series Throttle Body sizes

By teal_dx
- Fri Nov 10, 2006 5:05 pm #474 I see people talk about "upgrading their throttle body" to one from a D16y8 or D16z6... All the EG's and D-series EK's have a 56MM TB. So don't spend money on another one.

Inside Diameters (in mm)

d15b7 - 56
d16a6 - 55
d16y7 - 56
d16y8 - 56
d16z6 - 56
ZC - 55
d16a1 - 55
d16a8 - 55

By Hondelso
- Sun Nov 12, 2006 11:45 pm #502 i think the vx/cx ones are smaller. everytime i look at my vx its so rinky dink. i need a motor upgrade, but the mpg is so great!


the D15z1(VX) has a 40mm throttle body. i will take a picture of my motor... thing is so rinky dink. can't wait to finish my z6!
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By blackej2coupe
- Tue Jan 08, 2008 11:43 pm #36983 yea everyone says to upgrade, so my t/b for my d15b7 is 56 and a d16z6 is 56 so its pointless to upgrade?
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By york62
- Wed Jan 09, 2008 3:27 am #37007 Gsr TB is what i'm getting.
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By Civic_HatchSI
- Wed Jan 09, 2008 9:41 pm #37067
york62 wrote:Gsr TB is what i'm getting.


hey craig let me know if you need one, im replacing mine with a skunk 2
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By OleFolk
- Sun Jun 20, 2010 5:04 pm #201259 so what if you have an aftermarket intake manifold is that a completely different story?
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By suspendedHatch
- Tue Jun 22, 2010 5:42 am #201491 Yes, the CX and VX throttle body is quite small. I have a pic of one on my site next to a quarter.

Increasing the size of your throttle body is not an upgrade unless you are forced induction. For people with only I/H/E, you will actually lose power. I dyno tested a Z6 I/H/E with an LS throttle body and it lost power just as the tuner warned me. So I put it back to stock.
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