FS: TWM Idividual Throttle Bodies B16/Type R

[AcuraBro]

I have a set of TWM Individual throttle bodies that I bought last summer that I didn't end up using. Brand new, never used comes with Fuel pressure regulator, MAP sensor, and 310cc injectors as well (saturated OBD-II). New retail is $2200, I'll take a $500 cut.

$1475 brand new.
http://nitrogen.persius.net/~chris/parts/twm1.JPG
http://nitrogen.persius.net/~chris/parts/twm2.JPG
http://nitrogen.persius.net/~chris/parts/twm3.JPG

[celica man]

i have a question on those......how does it filter the air?

[Slava]

I don't think taht it does they are for race purpose only. But thats what I think.

[AcuraBro]

It doesn't filter the air. You can get an airbox for them, but they're pricey.

[blmorris04]

i have a 99 gsr and im interested in the itb setup from twm if you still have it and i was wondering if it will fit on my gsr and if it also comes with a fuel rail. i would appreciate it if you could send me some pictures of it and if its brand new never used then consider it sold

[AcuraBro]

The trouble is, the throttle bodies are made for a B16/Type R PR3 head intake manifold bolt patern, and won't fit the GS-R's.

[STIBungy]

Jose, you can buy individual filters for each TB.

[xmerklex]

bump for a good deal...

if i had to do it all over again...id get those and go all motor madness

[AcuraBro]

Bump. Remember this won't fit GS-R manifolds.

[STIBungy]

Sorry, edited my post.

[fantasya98]

man, those look sweet, but wats the real advantage in itb's? no one has really explained it..

[AcuraBro]

1. Greatly increased throttle response. ITB's have a much smaller volume of air to move to get the air behind it into the cylinders. The quicker and easier the air flows to the Cylinders, the increased throttle response.

2. Greatly increased air flow. When you have long duration cams and a pretty large sized overlap (meaning, the exiting exhaust gas creates a vacuum in the cylinder actually sucking the air into the engine when the piston is still near TDC (ie, not yet on the intake stroke)), you can allow for a greater volume of air going to each cylinder. A stock GS-R throttle body has a 52mm throttle plate. These ITB's have 4 x 50mm throttle plates. If you do the math, the area of the throttle plate(s) increase from 2123.7mm^2 to 7854.0 mm^2.

To build on that, think about this. I know we've all played a recorder as a kid-- ya know, the claranet looking thing. Imagine for a second that you plugged the end of it, and there are only 4 holes. If you have all 4 holes but 1 plugged at once, then lift your fingers up sequentially (1 at a time, in a repetitive sequence, you're going to get turbulant air going through the recorder's insides. Same thing with the inake manifold. each cylinder opens one at a time, so the air isn't constantly flowing in 1 dirrection all the time inside of a single throttle plate manifold. If your firing order is 1, 3, 4, 2, the columb of air inside will first move to the first cylinder. The first part of the columb goes to combust, but it doesn't all go in, so back up, and get sucked toward cyl. #3. This is why your fuel injectors are placed all the way down the intake manifold, sticking into the head. If you eliminate the link of the 4 cylinders, the air for each cylinder is sucked into it in one consistant dirrection as needed. Once you have the flow in 1 dirrection, you can move the injectors back much further. This increases the atomization of the fuel greatly. The more atomization that takes place, or "mixing", the cleaner, and more powerfull burn you are going to get out of the cylinder (increase in power). There was a test in HCI magazine on these throttle bodies, where they used the stock TWM injector position, then plugged those holes and placed the injectors on a bracket just barely into the air horns (called a shower injection set-up), and they gained 14 whp right off the bat, on a B16. The reason why you can't do this on a single plate throttle manifold is because you wouldn't get a precise amount of fuel into each cylinder if it mixed before the intake ports on the head, creating a powerband and emissions nightmare. You would be misfiring constantly.

3. Ability to tune much more finely. Now since the columb of air is running in 1 dirrection, and you have the ability to adust the throttle position of each cylinder, you can tune the car with a much greater precision, getting precisely the same power out of every engine cycle.

I may have missed a few points, but you get the idea.