I have a y8 head and manifold thats i will be installing in my 89 hatch soon, and i was wonder about the IACV on the Y8 has three wires and mine only has two wires, I know that you can modify the Y8 to use your old IACV but you hav to drill the manifold and one of the holes that need to be drilled should port to the throttlebody, is there a write-up about this andwhere and if anyone has any idea of what all needs to be done please post it up


thanks people

 

So you have the Y8 manifold from an automatic then, right?
Go get a Y8 manifold from an manual tranny car and you won't have those problems.

 

the manfold is from a manual car, i took the motor out of the car myself!

 

If it's a manual intake then it should already have the ports leading to the back of the manifold for you to put on the IACV.

 

then all i sould have to do is drill them out right?

 

If I think you have from what you describe, when you look at the flange for the TB to mount to there is only the main large hole, right?

If that's the case, then you will need to first locate the correct TB and gasket to convert it so you can use the manifold mounted IACV.
With the correct gasket, you can trace the pattern of where you can drill a hole for the bypass.

You will also need to get the proper IACV and trace out where you will need to drill ports for it as well.
I think you will need to also drill and tap a hole for mounting the IACV - my auto manifold only had one loactation for a screw and the other was not there.

With all that marked out the rest is just drill work.

The port for the IACV that will be furthest away from the tranny gets drilled all the way through into the manifold plenum.
The other hole gets drilled partially and NOT all the way through.

The port going from the throttle body gets drilled to meet the partial hole from the IACV.

 

Is there anyone that has done this, if so can someone provide a few pics.

If I think you have from what you describe, when you look at the flange for the TB to mount to there is only the main large hole, right?
If that's the case, then you will need to first locate the correct TB and gasket to convert it so you can use the manifold mounted IACV.
With the correct gasket, you can trace the pattern of where you can drill a hole for the bypass.

You will also need to get the proper IACV and trace out where you will need to drill ports for it as well.
I think you will need to also drill and tap a hole for mounting the IACV - my auto manifold only had one loactation for a screw and the other was not there.

With all that marked out the rest is just drill work.

The port for the IACV that will be furthest away from the tranny gets drilled all the way through into the manifold plenum.
The other hole gets drilled partially and NOT all the way through.

The port going from the throttle body gets drilled to meet the partial hole from the IACV.

 

go here, all your questions will be answered
http://www.geocities.com/joeyp....html

 

actually my questions will not be answered, because it does not tell you how to drill the manifold for the IACV

 

bump, i still need some answers

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sideout &raquo;</TD></TR><TR><TD CLASS="quote">go here, all your questions will be answered
http://www.geocities.com/joeyp....html</TD></TR></TABLE>

That helps zero.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4drEF &raquo;</TD></TR><TR><TD CLASS="quote">

That helps zero.</TD></TR></TABLE>

then ill delete it...

your post seems to help zero, no need to be an *******!

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 89cvchb &raquo;</TD></TR><TR><TD CLASS="quote">

actually my questions will not be answered, because it does not tell you how to drill the manifold for the IACV
</TD></TR></TABLE>

i didnt put that in because you shouldnt have to drill it. the auto y8 manifold is best used as an upgrade for a d16y7 obd2 civic. since they share the 3 wire TB mounted iacv.

everyone else should use the manual y8 manifold which has the 2 wire iacv mounted in the back of the manifold, just like most other manifolds.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 89cvchb &raquo;</TD></TR><TR><TD CLASS="quote">I have a y8 head and manifold thats i will be installing in my 89 hatch soon, and i was wonder about the IACV on the Y8 has three wires and mine only has two wires, I know that you can modify the Y8 to use your old IACV but you hav to drill the manifold and one of the holes that need to be drilled should port to the throttlebody, is there a write-up about this andwhere and if anyone has any idea of what all needs to be done please post it up
</TD></TR></TABLE>

if your iacv is mounted on the tb and has 3 wires...it is from an auto, period. you can drill it if you want but its not worth doing.

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

This is for an auto Y8.

You'll notice the IACV [item #2] is mounted underneath the throttle body.



This is for the 5-speed Y8.

You'll notice that the IACV [item #9] has been moved to the manifold itself where as on the auto manifold, this mounting location was blocked off.

These IACV's are also different between the two. The auto Y8 uses a 3-wire while the 5-speed uses a 2-wire.

ECU's meant to control a 3-wire IACV will NEVER be able to control a 2-wire IACV and vice-versa.

Another important difference in their operation is what happens to them if you simply unplug them. If you unplug a 2-wire IACV, there is a spring that pushes a 'paddle' closed thus sealing off the additional air passage to the manifold. Well, if you unplug a 3-wire IACV, it doesn't close down - it actually remains open, just inactive, which does allow a very large vaccum leak into the manifold.

I mention this, because I've seen too often where someone has a stock Y7 wanting to do a Y8 manifold swap. They purchase the 5-speed Y8 version but still retain the stock Y7 throttle body and since they still have the 3-wire IACV attatched, just left disconnected, it becomes a big vaccum leak which leads to the hunting idle.
</TD></TR></TABLE>

jees, i put something online, take the time to answer questions to the best of my knowledge and some people are still ********...never happy. its like im talking to a bunch of women...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fastcrxsi90 &raquo;</TD></TR><TR><TD CLASS="quote">jees, i put something online, take the time to answer questions to the best of my knowledge and some people are still ********...never happy. its like im talking to a bunch of women...</TD></TR></TABLE>

LOL!

 

i put the y8 motor in my car and i didnt mess with the iacv at all and mine idles better than my stock motor. mine just plugged on and worked, i drive a 91 dx hatch

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sideout &raquo;</TD></TR><TR><TD CLASS="quote">go here, all your questions will be answered
http://www.geocities.com/joeyp....html</TD></TR></TABLE>

updated for anyone who still thinks this is useful...

 

I didn't read your page but I did look at it. All that info there has to be something good!

I did drill the auto manifold to work with a manual IACV. I also had to get the flange that mounts to the head ground down because of the air injection system. If you use your head you should be able to figure it out. Its not that hard! Look over what you are trying to do and think of how it'll work. Hint: Look at another manifold.

 

Why did you grind the flange down instead of just plug it?
Just curious about what benefit that would be.