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Throttle Body Size Chart

 
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Old 09-24-2008, 01:12 PM
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Throttle Body Size Chart

Honda Throttle Body Sizing Chart

Inside Diameters (in mm) measured at the butterfly/intake manifold side

* d15b6 - 46
* d15b7 - 56
* d16a6 - 55
* d16y7 - 56
* d16y8 - 56
* d16z6 - 56
* ZC - 55
* d16a1 - 55
* d16a8 - 55
* b18c1 - 60
* b18c5 - 62
* b18a - 58
* b18b - 60
* b16a SiR - 58
* b16a Sir2 - 60
* b16a2 - 60
* b16a3 - 60
* b20b - 60
* b20z - 60
* h22a - 60
* h23a - 60
* f20c - 62
* f22 - 60
* f23 - 60


basically, it shows the increase in airflow of each throttle body over a stock 1st gen b16a throttle body (58mm).
All throttle bodies are measured at the butterfly plate/intake manifold side.
Also note: the "Spoon 70mm" is not a typo, the 70mm measurement is taken at the tip of the intake to the throttle body. the unit tapers from 70mm down to 62 at the butterfly.

Last edited by Si Speed; 05-24-2009 at 11:12 PM.
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Old 09-24-2008, 01:17 PM
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Re: Throttle Body Size Chart

Thanks Steph! I was just cruising the internet for this
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Old 09-24-2008, 01:29 PM
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Re: Throttle Body Size Chart

no problem. I might have a few wrong so correct me if I am thanks!
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Old 09-24-2008, 01:45 PM
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Re: Throttle Body Size Chart

Resource guide, here we come!
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Old 09-24-2008, 02:53 PM
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Re: Throttle Body Size Chart

how are the air flow numbers being determined?
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Old 09-24-2008, 03:03 PM
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Re: Throttle Body Size Chart

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Originally Posted by 98vtec View Post
how are the air flow numbers being determined?
Probably by some huge mathematical equation. Air per square/mm or something crazy. Porobably an Air Flow Bench too.

But the percentages are being compared to the 58mm tb. Of course the power is not going to be the same with the different variables such as intake, intake mani,cams just a few for example.

Last edited by 99PreludeSh; 09-24-2008 at 03:10 PM.
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Old 09-24-2008, 05:23 PM
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Re: Throttle Body Size Chart

I am assuming they are using the same manifolds, cams, intakes, etc... otherwise they would have stated otherwise. And if not... FALSE ADVERTISEMENT!!!
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Old 09-25-2008, 02:41 AM
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Re: Throttle Body Size Chart

good stuff steph. One question would I be yeilding gains in an s2k Tb
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Old 09-25-2008, 07:40 AM
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Re: Throttle Body Size Chart

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Originally Posted by LudeLove99 View Post
good stuff steph. One question would I be yeilding gains in an s2k Tb
If you have supporting mods then yes but if you just slap on an S2k tb you will see MINIMAL to no gains.
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Old 09-25-2008, 08:42 AM
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Re: Throttle Body Size Chart

Nice find!!!!
Correct me if im wrong
If your not adding any more spark and you have a optiomal Air fuel ratio, there wont be any gains at all, basicly youll be adding to much air and your car will be running dry (loss of power), thats worse for your motor then running rich. But adding more fuel and a better spark will deff be a huge increase in your car porformance and throttle response (creating a higher cumbustion)

Now I dont know much about fuel injection and how its regulated but im sure the ECU dose that, will the ECU calculate the Fuel precent based on Air Fuel Ratio?
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Old 09-25-2008, 08:53 AM
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Re: Throttle Body Size Chart

Kind of.... for one it's called a lean mixture when their is more air then fuel in the ratio. two - If you don't really "add more spark", the sparkplugs are always there, it's the air/fuel mixture that determines a lean or rich mixture. lean = more air, rich = more fuel. That's why when you say turbo a car, you have the potential for alot of air for the ratio, so by adding 450cc, 550cc, 850cc etc... injectors, you add more fuel to the mixture, thereby creating the perfect ratio BUT you have much more fuel and air which can equal to much more power

i may be wrong on this - i sort of paid attention in fuels class this past spring, but it's been a while, haha
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Old 09-25-2008, 09:34 AM
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Re: Throttle Body Size Chart

Quote:
Originally Posted by OEM~KaOs View Post
Kind of.... for one it's called a lean mixture when their is more air then fuel in the ratio. two - If you don't really "add more spark", the sparkplugs are always there, it's the air/fuel mixture that determines a lean or rich mixture. lean = more air, rich = more fuel. That's why when you say turbo a car, you have the potential for alot of air for the ratio, so by adding 450cc, 550cc, 850cc etc... injectors, you add more fuel to the mixture, thereby creating the perfect ratio BUT you have much more fuel and air which can equal to much more power

i may be wrong on this - i sort of paid attention in fuels class this past spring, but it's been a while, haha

You are 100% right, Even with the tearms, Its been 3 years senice i had to think about the tearm but yes Running LEAN is what its called. Dam im getting old.

No you dont add spark but you can create a bigger and better spark adding electrical current and a precise gapping



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Last edited by bdizzel124; 09-25-2008 at 09:37 AM.
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Old 09-25-2008, 09:36 AM
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Re: Throttle Body Size Chart

But I am fairly certain that is achieved by getting "better" sparkplugs - or in this case, sparkplugs that do what you want them to do, lol. You can do it yourself, as I had the chance to mess with sparkplugs, cleaning them and re gapping them and all that good stuff, it was really cool - especially the sand blaster box to clean them!! that was fun sh!t
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Old 09-25-2008, 09:41 AM
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Re: Throttle Body Size Chart

If you go from a 58mm to a 62mm and upgrade your intake manifold and cams allowing more air to flow you dont HAVE to upgrade your injectors. If you have a program management you can add fuel, or you can bump the base fuel pressure up with a regulator. You can also add a little more power with bumping the timing up but you would need to run premium or better just to be safe.
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Old 09-25-2008, 09:41 AM
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Re: Throttle Body Size Chart

Also plug wires and MSD ingition, Really in most cases there not needed but for maxium performance ID say its a must have, (1-5 gain in HP based on A&F ratio)
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Old 09-25-2008, 09:43 AM
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Re: Throttle Body Size Chart

Quote:
Originally Posted by 99PreludeSh View Post
If you go from a 58mm to a 62mm and upgrade your intake manifold and cams allowing more air to flow you dont HAVE to upgrade your injectors. If you have a program management you can add fuel, or you can bump the base fuel pressure up with a regulator. You can also add a little more power with bumping the timing up but you would need to run premium or better just to be safe.

Boom you said what i was looking for program management Then again youd be chaning your air fuel ratio changing you to a high compression right if tuned properly?
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Old 09-25-2008, 09:55 AM
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Re: Throttle Body Size Chart

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Boom you said what i was looking for program management Then again youd be chaning your air fuel ratio changing you to a high compression right if tuned properly?
Your compression will NOT change if you add more air.
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Old 09-25-2008, 10:00 AM
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Re: Throttle Body Size Chart

But your adding more fuel for the corect A&F ratio to be corect.
Im looking at things at optiomal performance not hey im thorwing this on and calling it a day. You can do that but gains wont be as noticalbe.
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Old 09-25-2008, 10:07 AM
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Re: Throttle Body Size Chart

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Originally Posted by bdizzel124 View Post
But your adding more fuel for the corect A&F ratio to be corect.
Im looking at things at optiomal performance not hey im thorwing this on and calling it a day. You can do that but gains wont be as noticalbe.
Compression Ratio is the ratio between the volume of the cylinder and combustion chamber when the piston is at the bottom of its stroke, and the volume of the combustion chamber when the piston is at the top of its stroke

basically its the ratio of how much space you have and you can compress the gas in... from bottom dead center to top dead center
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Old 09-25-2008, 10:13 AM
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Re: Throttle Body Size Chart

Yes - but we also didn't talk about tuning to get proper A/F ratio, which is something that should probably be done. There are alot of variables involved, it's not as simple as throwing parts on and expecting it to run just as it did with proper A/F ratio
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Old 09-25-2008, 10:35 AM
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Re: Throttle Body Size Chart

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Originally Posted by bdizzel124 View Post
Boom you said what i was looking for program management Then again youd be chaning your air fuel ratio changing you to a high compression right if tuned properly?
Ha quoting my self

My mistake, It would be a highger air fuel ratio,

Example 10 parts air 2 parts fuel changes to 15 parts air 4 parts fuel, etc.
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Old 09-25-2008, 03:33 PM
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Re: Throttle Body Size Chart

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Originally Posted by bdizzel124 View Post
Ha quoting my self

My mistake, It would be a highger air fuel ratio,

Example 10 parts air 2 parts fuel changes to 15 parts air 4 parts fuel, etc.

think about this for a second and you will see why you are a bit misinformed on how to read AFR properly.

10/2 = 5
15/4 = 3.x

its always going to be X parts of air to 1 part fuel.

lets take stoich for example, 14.7:1. that 14.7 parts air to 1 part fuel. not 14 parts of air and 7 parts of fuel.
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Old 09-25-2008, 03:55 PM
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Re: Throttle Body Size Chart

I was just saying random number with no thoguht behind it but thanks for the info
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