that would be legitimate. time to research.

 

S2000 throttle body assembly

honda fit's throttle body

 

definitely has a larger bolt dia if that is 64mm, plugs look compatible though. You could always fab up a mounting backet and mount the unit at 45 degrees.

 

there is room for that under the fit hood. i think it is a 66mm tb. looks like cooling nipples and dbw plug are similar but do they send the same signals?

 

No idea about signal/voltage required, but they are both Honda so hopefully they share some common traits.

 

wonder where we could find the info on signal and voltage output?

 

^ first thing that came to mind was Blitz or Pivot. they make throttle controllers, they might be able to let us know that info. just a guess.

 

I'm happy to see that you're thinking about TB and its importance.
This document will help you to understand more...

http://www.vems.hu/files/MembersPage...n/gaspjeld.pdf

I'm sure that at the end someone will change its stock TB!!!

 

so the edm tb is a drive by wire system?

 

So I wasn't able to bolt in the Rev2 manifold today. However I got 2 dimensions to report;

Air intake side of the TB measured out to 64mm, it clearly gets smaller inside of course.

The WR manifold measured out to 55mm,

Will get the outlet side of the TB measured up once I have it apart either tomorrow or on Tuesday.

So somebody was saying the new 09's have a 52mm TB? Sounds promising!

 

55mm and 64mm!
Seems that your Tb doesn't need to be upgraded...
That's another reason because vtec is more powerful than idsi....
The new 09's should have a smaller TB? 52mm vs what?

 

tagging for interest

 

Check this:

Maxbore.com throttle body boring service
They do TB porting.

Karim

 

tb boring is good if you want to still pass emissions and what not, but the gains are very minimal. I would gladly swap my tb's every 2 years if I could have a 60 mm tb that would have a 53mm manifold opening and actually make about 3 hp for 300 dollars instead of 1/2 hp for the 150 it would cost to rebore the stock one.

 

Confirmed today that the inside dia of the TB on the manifold side is also 55mm. So the only restriction is the actual butterfly dia itself which I assume is 45mm.


Would be interesting if the new Fit has a butterfly of 52mm and the same inlet and outlet dia. Would be a direct bolt in then

 

I'm pretty sure that all throttle bodies taper down so I would be suprised if the inner diameter is no bigger than 46 maybe 47 mm on the inside.

 

Then you need upgrade....

 

next 09 fit that comes in to get pdi'd ill see if i can measure the throttle body on it.

 

so why won't the JDM DBW ones work? I know at least J's makes a DBW model, donno about spoons tho...

 

A 64 mm Throttle body would definitely be too big for a 1.5l engine... I used to mod many Neons in the past and i can say for sure than swapping a 49mm Mtx Tb for an 52mm ATX Tb on a neon gives more or less 6 to 10Whp depending on mods...

found this on the web a long time ago... sorry, it's from a neon forum but it should apply on all engines!!


Gary Howell wrote:

"49mm TB flows 252 cfm
52mm TB flows 283 cfm
55mm TB flows 317 cfm
60mm TB flows 377 cfm

At 8200 RPM (Max RPM of a DOHC Neon with AF\X-Race V1 PCM) a 122 cubic inch engine will need 290 cfm at 100% volumetric effiency, using the formula ((Max RPM/2)*Displacement)/1728. Rule of thumb is to go 10% over because a naturally aspirated engine can go above 100% volumetric efficiency because of cam overlap, header design, etc. Go above that and you kill low end because of reduced velocity, go below that you starve the engine for air at top end. 110% is volumetric efficiency is 319 cfm."

Hope this helps!!

Marko!!