How much?

 

70mm

 

70mm really that is too much ..isn't? i think the most it can be bored too is 64mm.

 

is that for all H22 motors and how do you get it bored to 70mm? one more question, what is the stock size for the H22a1 TB?

 

60mm

 

I think I had mine up to 64mm... or was it 68mm...damn... I don't remember now.

Oh well...

 

Our stock ones can't be bored more than 64mm. Anything larger than that you don't have a wall anymore. If you want something more than 64mm then get a S2k TB or a ITR TB. Those can be bored to around 69mm.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TimeRacer &raquo;</TD></TR><TR><TD CLASS="quote">Our stock ones can't be bored more than 64mm. Anything larger than that you don't have a wall anymore. If you want something more than 64mm then get a S2k TB or a ITR TB. Those can be bored to around 69mm.</TD></TR></TABLE>

and those bolt right up to the h22 intake manifold?

 

Yes, both the ITR and the S2k throttle bodies both match up with the stock intake manifold. You'll have to port match the opening, but they fit great. You also retain the EVAP valve with the ITR (the s2k one doesn't have it as it's located elsewhere on the manifold) throttle body which you generally don't get from aftermarket throttle bodies.

 

Don't forget the S2K/ITR TB has no Fast idle control valve since it is electronically controlled. As well, the H22 TB can be bored out to a maximum 66mm (stock is 64mm). The S2K is 70mm (stock 66mm).

Keith

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Keith &raquo;</TD></TR><TR><TD CLASS="quote">Don't forget the S2K/ITR TB has no Fast idle control valve since it is electronically controlled. </TD></TR></TABLE>

So how can they work in H22? I predict rpms bounce horribly then...
pentaq

 

Many of us already have the fast idle valve already blocked in a coolant bypass manuver on our stock throttle bodies. Even when I had the S2k throttle body (69mm-&gt;64mm taper bore) I had a rock solid idle of ~800 rpm. Same deal with the fast idle valve blocked on my H22 TB.

 

My buddy just put an ITR on his prelude. I'm waiting to see how it goes and then I might follow. I'll let you know.

 

let us know how that works

 

my friend has a 99 SI and he put a ITR TB on and its throwing codes, where gonna probably put the ITR TB on my h22 to see if it throws codes also, i'll let you know tomorrow if it works or not

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Keith &raquo;</TD></TR><TR><TD CLASS="quote">Don't forget the S2K/ITR TB has no Fast idle control valve since it is electronically controlled. As well, the H22 TB can be bored out to a maximum 66mm (stock is 64mm). The S2K is 70mm (stock 66mm).

Keith</TD></TR></TABLE>

You find me a stock prelude TB that is 64mm, other then a Type-S..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pentaq &raquo;</TD></TR><TR><TD CLASS="quote">

So how can they work in H22? I predict rpms bounce horribly then...
pentaq</TD></TR></TABLE>

Nope, I'm running fine and the weather has dipped into the mid-20ies here.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Cottonwoodz &raquo;</TD></TR><TR><TD CLASS="quote">

You find me a stock prelude TB that is 64mm, other then a Type-S.. </TD></TR></TABLE>

BAM! I know what I'm talking about dude!

My H22 TB (intake side) 64mm (my ruler is off)


IM side (62 mm)


If you still don't believe me, then I have a Type-S TB to sell ya.

Keith

 

This my S2K TB after it was P + Ped...

 

Damn the roof is in the pudding.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BolivianFuego &raquo;</TD></TR><TR><TD CLASS="quote">Damn the roof is in the pudding. </TD></TR></TABLE>

oh **** who put the roof in the pudding! Now it's ruined! ROFl I don't know why but that cracked me up! Oh man, the roof is in the pudding.

Anyway, I want to know if the 70 is really for the turbo guys, or if there could be a rather extreme NA build-up that'd make good use of it.

 

Throttle body size means much less when you're going FI. It would be one of the absolute last things I'd do if I were tuboed as the air is being forced in already.

 

So how technically is that done? As I understand the intake part of TB is bored to 6x mm and polished. Is the butterfly changed anyhow then? If not, how can any gains be achieved as the butterfly diameter is a bottleneck in this situation?
Could anyone explain, please?
pentaq

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pentaq &raquo;</TD></TR><TR><TD CLASS="quote">So how technically is that done? As I understand the intake part of TB is bored to 6x mm and polished. Is the butterfly changed anyhow then? If not, how can any gains be achieved as the butterfly diameter is a bottleneck in this situation?
Could anyone explain, please?
pentaq</TD></TR></TABLE>

The butterfly plate would need to be changed in the process. Usually, the place that bores out the TB, supplies and replaces the plate.

 

Your ruler isnt off, Someone just needs to take a measureing class.