Throttle Body Question

[hattech-v]

perplex :)

itu paip pvc 3inch pun bole... haha

 

[udengfahlawi]

perplex :)

can that thingy stand the engine bay heat?...

 

[J101]

udeng,
the box was suppose to create a mini vacuum chamber near the your headlight. its definitely better than aluminium. i think a thicker perplex might gonna cost you a bit.


hattech,
that is a VERY big throttlebody :p

 

[evoX2]

is there any difference between a dc2R tb and bored B16A one?

 

[hattech-v]

yes. different 2mm

 

[J101]

yes. the price :p

 

[evoX2]

yes. different 2mm

yes. the price :p

i mean if bored b16a to 62mm, any difference between those two?

 

[shiroitenshi]

i mean if bored b16a to 62mm, any difference between those two?

faster throttle response, due to the fact that 10% 58mm < than 10% 62mm.

 

[hattech-v]

i mean if bored b16a to 62mm, any difference between those two?

b16a 67mm tapered to 64.5mm butterfly max. b18cr 70mm - 64.5mm

 

[evoX2]

b16a 67mm tapered to 64.5mm butterfly max. b18cr 70mm - 64.5mm

does bigger tb gives better response in high rpm? any difference during low rpm range?

 

[hattech-v]

very hard to feel the different unless by dyno...
normal driving u cannot feel the different or not obvious...

 

[budin99]

cannot expected 20 ponies released laa..1 or to 2 ponies already a bonus + the throtle response feeling.

 

[J101]

old thread
http://www.zerotohundred.com/newforums/honda/131969-throttle-body-question-3.html

 

[evoX2]

very hard to feel the different unless by dyno...
normal driving u cannot feel the different or not obvious...

how will be the dyno? 1 or 2 hp increase? if use one skunk2 manifold, better response?

 

[shiroitenshi]

lol, TB size increase is for issues with not enough flow at full throttle, I wonder how it helps in terms of getting more air into the engine, because NA sucks air, not like turbo that pushes/forces air in.

that's why turbo's need big ones, because they push a lot more volume than a normal NA, depending on boost amount.

For NA, stay conservative, go with regular sizing by most aftermarket. 62 to 64.5 is the norm, bigger, maybe if you run high rpms that need it, but in most cases, too big makes no difference... you just hit 100Kpa (manifold pressure) earlier without needing to go WOT. 100Kpa (atmospheric pressure) is usually the maximum manifold pressure you can get on NA (if using turbo boost gauge, the meter will read 0, atmospheric pressure) you might get the ram air effect if you drive fast enough, and pipe the intake to the front of the bumper, but in most cases, I don't think you'll ever see it much, unless your intake is exposed out the front of headlight/bumper.

But if you buy bigger billet TB because billet TB's look cool, go for it... I do think they look cool as well. :P

 

[evoX2]

u mean the most is 64mm then any larger no more benefit? from 60mm to 64mm can give any gain?

 

[shiroitenshi]

u mean the most is 64mm then any larger no more benefit? from 60mm to 64mm can give any gain?

It's not a matter of which is better, but what suits your engine.

Throttle bodies are tapered for a reason, it's to create the 'venturi' effect (google this term up for detailed explanation)

The venturi effect is to promote flow speed, in which case, it helps accelerate the air into the plenum of the intake, creating inertia for the air.

The TB plate size is for the amount of air you can flow at a certain speed, if you can flow more at a reasonable speed, then you will probably need something a lot bigger than 64mm.

higher revving engines can suck air a lot faster than standard ones, which is why honda B-series TB is a lot bigger than most other makes of similar capacity.

Some people eliminate the taper and go direct, but IMO, those are probably suited for turbos, which is why most NA TB's are always tapered.

TB sizing also differs from manufacturer to manufacturer, some spec butterfly plate size, some specify taper size, which makes things a little confusing.

If you can evaluate the flow of your engine, then you can estimate how big you need to go. The honda ECU works on the speed density principle, and it has the IAT and the MAP sensor, and this is a help in determining TB size.

for a B16, it's about 60mm, (through my experience of messing with my car) and going any bigger simply makes me hit zero vaccuum (100Kpa atmospheric) a lot earlier than 100% TPS. Of course, this is for B16's rev limited to 8-8.5K, you can probably run the R's 62mm at 9K, and it should offer some improvement.

In the end, you can simply go bigger and hence avoid buying too little a TB, but FC will suffer, and part throttle response too (though can be eliminated by tuning)

But too big will kill part throttle/low end power too, because the venturi effect no longer efficient. So you can buy a little bigger than stock, but not too much.

I wonder how many B18C's run 70mm TB's and realized this.

 

[hattech-v]

udeng using it. if not mistaken he using 72mm for his b16b..

 

[shiroitenshi]

udeng using it. if not mistaken he using 72mm for his b16b..

Ok.. wait...

BESARNYA!!!! Heh.. but as the normal question...

Is it really a B16B? :P still, 72mm, that's BIG.

 

[hattech-v]

yes... its pure 16b with 92mm stroke... kekekkekeke