pdexta

iTrader: (17)

Using a map sensor, is it necessary to plumb in the IAC valve into the charge piping on a 1.8 NA or can you just throw a breather filter on it? In the past I've always had it plumbed in, but with my current car it's open. Will it create a boost leak or does it seal once the car is off idle?

shuiend

iTrader: (24)

I have always been told that it will produce a small leak because it does not seal completely. I have never actually tested this though to see for sure.

dcamp2

iTrader: (4)

I ran mine open with a breather filter (naturally aspirated), and it sounded like **** and the idle didn't work as well as it used to. Car ran fine otherwise. When going FI, I re-plumbed it back into the intake because I thought it might leak backwards in boost.

So maybe?

Braineack

iTrader: (62)

were you running an aftermarket ecu using MAP based speed density?

there's no reason it can't be open to air, if it leaks in boost (which it shouldn't), install a check valve.

pdexta

iTrader: (17)

Thanks for the help guys. Never even thought about a check valve, that seems like the simplest option. I really wish there was an idiot proof way to get an NB throttle body to work, but I couldn't ever get the TPS working right.

dcamp2

iTrader: (4)

yes- MSPNP2 (forgive me father).


A check valve would work... I just cut the old stock rubber tube and made a bung in my intake piping to attach.