When I was replacing the seal with an actual gasket I noticed something strange today. I thought it might be why I am getting such a hard lope.

Notice in the pic that the IAC hole is not lined up with the bevel in the RADIX intake. In fact, there is no way that the IAC hole can vent into the RADIX intake the way it is.

http://bettie.homeip.net/atvpics/tru...B/100_0922.JPG

I dremeled a passage to connect the 2 sides above the TB bore.

 

The DBW Throttle bodies do not have an idle air control valve. From the pics, everything looks just like the ones we intsall here. What is your complaint?? Idle rough?

 

Very ... I JBWelded the whole I drilled back up, but I think I'm gonna drill it back out a little. Maybe not as much as it was since it was idling at 900rpm and wouldn't go any lower.

 

i would suggest gettng edit and tuning it that way.....The electronic TB is going to try and compensate for the hole you drill.

 

I'm thinking the new 90mm Corvette throttlebody might be a good bolton for a ported Radix intake tube.I'd love to get a good picture of one because they look like a larger version of the 03,04 truck throttlebody.

 

Flyer, that hole you were messing with feeds the PCV system. Nothing to do with IAC or intake air at all. Completely seperate.

 

How so ... on mine .. the PVC is in the intake tube about 3" in front of the TB.

I'm not doubting or questioning, well I guess I am questioning, just for my curiosity though.

 

Take a look at it. The PCV system works off of vacuum pressure. One valve cover is connected to the top of the intake manifold (under vacuum at low throttle). The other valve cover is connected in front of the throttle body (this side is has no vacuum pressure). The vacuum pressure from the manifold draws air through the block from the opposite valve cover which pulls from the fresh air source in front of the throttle body. That PCV tube you are talking about that is 3" forward is pulling air from that hole in the TB. The air path is completely sealed off from the TB and intake plenum.

The rectangular hole in the upper left here feeds that PCV tube.

 

Great Pics Tex!


And since the PCV tube is moved, you do not need the hole in the manifold. That is why that gasket "blocks" it off.

The PCV hole should be connected to the intake tube for the Radix. (on the bottom)

 

I think I see now ...

On a side note, before when I had the RADIX on the z71, I never saw that hole on the bottom of the intake tube, therefore it was never hookekd up.