Throttle body

[pedroalcala]

I did read. Aftermarket is a VERY vague term. I could, say, go purchase a PROPERLY sized ~64-68mm throttle body, and get gains. Or I could be a moron and purchase a huge ass 72mm throttle body, and lose a shit ton of low end torque and drop gas mileage. Your argument holds no water either way.

Clearly that is what I said. "going with larger aftermarker TB (other than stock) will kill your gas milage" and I experienced with 2 of them, 72mm and 75mm.....

[foamypirate]

Clearly that is what I said. "going with larger aftermarker TB (other than stock) will kill your gas milage" and I experienced with 2 of them, 72mm and 75mm.....

That's why you pick proper parts, not just the biggest damn thing you find on ebay. Sorry for assuming people actually thought through about modifying their cars...Won't do it again.

[pedroalcala]

That's why you pick proper parts, not just the biggest damn thing you find on ebay.

yea I know, and that was 4 years ago when i was riced and didnt go to honda schooling at denver which i just finishd....

[porter351]

let me start by appoligizing, i shouldnt have called u names. that being said u are still wrong. the reason i brought up an intake and filter is because ur saying MORE AIRFLOW means LESS GAS MILEAGE, which is wrong. if that was true then a clogged air filter which gives u LESS AIRFLOW would mean u get BETTER GAS MILEAGE, everyone knows thats not true. im not sayin that a huge trottle body will give u better milage but it sertianly wont "kill it" ( it would prolly stay the same). u may have gotten worse milage, but it was cause something else was wrong (see where i said about tps or vaccum leak). as for my 68mm it isnt on a f22, its on a h22 with a port-matched plenum and a euro r manifold. its all errelivent anyway the op was talking about a bigger stock tb, i jus didnt want people thinking that a h23 tb will ruin there gas milage.

[pedroalcala]

let me start by appoligizing, i shouldnt have called u names. that being said u are still wrong. the reason i brought up an intake and filter is because ur saying MORE AIRFLOW means LESS GAS MILEAGE, which is wrong. if that was true then a clogged air filter which gives u LESS AIRFLOW would mean u get BETTER GAS MILEAGE, everyone knows thats not true. im not sayin that a huge trottle body will give u better milage but it sertianly wont "kill it" ( it would prolly stay the same). u may have gotten worse milage, but it was cause something else was wrong (see where i said about tps or vaccum leak). as for my 68mm it isnt on a f22, its on a h22 with a port-matched plenum and a euro r manifold. its all errelivent anyway the op was talking about a bigger stock tb, i jus didnt want people thinking that a h23 tb will ruin there gas milage.

[F20A CB7]

bump, i went to the jy and bought the h23 plenum, and even got a extra plate with butter flies... i also have the h23 tb...


now i kno i can double stack the IM. but i have a question. on the runners theres 8 holes. and on 1 side theres 4 butter flies.

on the extra plate if i double stack do i leave the extra butterflies ., and where does the term twin butterflies come in, is that another term for secondaries...


ill b searchin, but can some 1 help with diagrams or something vac lines for the h23 plenum

[theSOB]

search for the diy. you remove the butterflies from one of the plates and jb weld the holes.

[F20A CB7]

i found a thread on the plenum swap... but to me it looks confusing, the lines and hoses. mayb its just me. but ill do a double stack and keep 1 set of butter flies..

[Teddy]

here is some stuff i got from my honda shop

[Sarthos]

I've also heard JDM H23a vtec manifold has like 68 mm throttlebody factory?

[midnightrayne]

Is the f22b the jdm intake mani the same as the h23 or r they different?

[trah]

Is the f22b the jdm intake mani the same as the h23 or r they different?

the f22b IM that I have is exactly the same as the h22 intake mani. Top and bottom all part #'s match.

[midnightrayne]

Oh okay so there is no need for me to switch to the h23 manifold and tv correct?

[Ghetto_CB7]

WOT Yes Part No

At WOT you will loose gas mileage, otherwise you wouldn't get any hp / tq gains lol.

at part throttle the larger tb will do one of two things, one, is nothing, the other is make it easier to allow air into the plenum (just like intake) this reduces pumping losses on the intake stroke and creates more more torque. Hence increasing efficiency. Usually this is accounted for by tuning and adding additional gas.

However you also need to consider that you will be making more torque at part that rpm, so more force is applied to the ground.

Essentially it all comes out in the wash. Yes you require a little more fuel, but you get more out of your engine as well.

At idle you will see no change assuming you are tuned and set your idle correctly.

Another way to look at it.

Remember that the throttle plate is there to restrict air flow, so when you are not at wot you will have a restriction. In a stock tb you need a larger angle to create the same opening as would be created by a large throttle plate to create the same opening.

Graphically it looks like this



EDIT: Sorry for the crappy paint diagram LOL I hope it makes sense.

The green area's are the same, but you need less of a tps % or angle to get there.

You can keep and even improve gas millage with an aftermarket TB

By the way I have an h22 with 74-68 mm tapered TB and lost no gas mileage

regards