does anyone have pics of the iac on the d16y8

?

 

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.

 

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

exactly....

 

o snap..
this info is going on my technet site fa'shizzle..

 

bump

 

ok, time to breath new life into a dying (dead?) thread since i have a question. say you have the IACV mounted below the tb (auto) and youre swapping out throttle bodies for a larger bore. where should the IACV be mounted then if not below the new tb (for the reason of no place to mount)?

 

There isn't another 'big bore' t-body that will accept the 3-wire IACV mount pattern. Thats the only place that 3-wire IACV's can be mounted - to the throttle body.

Maybe get your existing t-body bored out??

 

hmm, damn, i already have a 62mm bbk throttle body. stock on a d16y8 is 56 i think, how much larger can you reliably bore it to? +2mm diam?

 

Unless your modifications dictate it (what are they) you maybe barking up the wrong modification tree.

At WOT and peak rpm, IF there is a pressure drop across the throttle body, then you need to open it up more - otherwise you're going to decrease the low end a little because you've decreased intake flow velocity.

 

In my opinion, with an automatic, the gains you will get from a throttlebody upgrade are negated by the transmission...If I were you, I'd only go with mods that will make substantial power, because you will spend money on these lower tier parts (like a TB upgrade) and will still be at a huge WHP and gearing disadvantage cuz of the auto trans...go turbo and/ or juice...or swap that trans and then continue with NA upgrades. I promise you, the money you spend on these little parts will be better spent on a trans swap...

You can easily unload that TB on d-series.org or h-t's classifieds...that should help you tranny swap fund...

 

i agree, but right now the tranny swap fund is extinguished due to the supercharger im installing. thats why i decided to upgrade the tb. might as well get as much air to the blower as possible. and thats why i went with the super - im in need of some low end grunt for sure. i know the tranny swap would have been more beneficial in the long run, but for a similar price, this adds more for the time being. im just attempting to build something more street friendly with what i have until i can afford a major project.