Sideways7

iTrader: (7)

Basically, I had a NA car and I am almost done with a full j-spec turbo swap using a haltech. It just occurred to me that I don't have the stock TID or the stock BOV (or whatever it is called.) Would it hurt to just cap off the port where it connected on the turbo outlet pipe and run it like that for a little while?

This is only temporary to get the car running while I decide on what sort of turbo upgrade I want to do, but I need to know that the motor is good before I drop any more money on parts I might not even use.

ifryrice

It can be done, there's a debate on if the additional backpressure applied to the compressor (spinning on inertia at this point) can cause additional wear/other issues from prolonged use, but it's certainly fine for short term.

NOPR

Definitely safe for the short term. Might **** with your fuel mixture a bit during shifts, but nothing serious. As mentioned it's not good in the long run for the turbo, especially for a non ball bearing one. If you have the stock ECU you'll want to get the stock valve that recirculates back to the intake, otherwise the richness during shifts will be permanent.

Sideways7

iTrader: (7)

Thanks, thats what I though but I wanted to double check.

Also, I'm running a haltech. By "**** with your fuel mixture a bit during shifts" do you mean rich, or lean?

Its a stock turbo, and there is a pretty good chance it will be sent off to BNR to be rebuilt, so its not too big of a deal if there is a little extra wear on it right now.

ifryrice

The original ECU 'meters' the air that the BOV dumps, so if you dump it back to the air, the ECU thinks the engine saw that air, and runs rich. Aftermarket's don't meter with this method, so it's not an issue at all.

g14novak

iTrader: (1)

Basically, you'll probably get a nice little "POW!" between shifts. Similar to not turning on the "fuel cut on decel" option on the ecu.

It's perfectly safe for the engine (short term), but the turbo bearings are going to take a little bit of a beating since it's not suppose to have the back pressure on it.

Sideways7

iTrader: (7)

Ok, so rich, then. I can deal with rich. I hate to think about the flames I'm gonna get now, I already had plenty of them when I was NA....

Evil Aviator

The rich condition only occurs in engines with a functioning AFM.

Turbocharger compressor surge usually makes a fluttering or skidding sound.