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K20A2 intake manifold + throttle body need your help

2297 Views 2 Replies 2 Participants Last post by  AngryScotsman
I'm planning to do some minor upgrades on my RSX-S. I've been doing a lot of reading and a lot of asking about throttle bodies but I can't seem to find the right part for my car. I'm looking to get a Skunk2 Pro intake manifold but my coworker is telling me to go RBC because the skunk2 is basically the same except they slapped a badge "Skunk2" on it. I don't know if this is true because i'm really new to all this. Also, I've been looking at the 70mm Skunk2 TB that I want to use but I read that you're gonna have to lose the coolant line because this one doesn't have a place for it. So I asked my coworker and he said he's got the Skunk2 TB on his K swapped EG coupe but he doesn't drive his car during winter and when he starts his car, he manually revs the car for a few minutes to warm it up. I, on the other hand, plans to keep my car a daily driver whether it's -50 degrees out or not so i'd like to be able to fire it up and leave it running for a few minutes without me having to rev it manually. I don't care about losing the cruise control because I rarely use it but I'd like to have the IACV if it's still possible. I don't want my TB freezing up on me during winter if I delete the IACV.
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Listen to your friend/coworker.

RBC is fine. I'm using it on a 600whp build. I also have the S2 TB as well, with a blank off plate for the IACV.
I have no real problems with idle, but my idle is also a little higher to offset when the AC engages. Usually in the 1000-1100rpm range with the AC off. If that's unacceptable to you, keep the IACV.
The IACV is only necessary to help regulate the idle between different engine loads -- such as when your AC is turned on, it keeps the idle up.

The coolant line to the IACV is more for emissions. In the winter, the car will take longer to get up to temp and so the coolant helps warm up the throttle body to get everything into closed loop.
Removing them has only ill effect on the emissions aspect. You'll get worse gas mileage while warming up the car and dump more pollutants into the air -- once in closed loop the coolant line is more detrimental as it can create heat soak issues -- bogging off the line on a hot day, type of thing.
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