faviles5566

Hey everyone,

Hopefully I can get some help here. I recently finished installing a T25 on my 1999 1.8. It has an ebay manifold, with custom intercooler piping, and a custom downpipe. I am using a Flyin' Miata Voodoo Box for engine management. I tuned it following the instructions that came with the Voodoo Box.

The car runs great when it isn't in boost, however after hitting boost and letting off the gas, the rpms drop and sometimes the car cuts off and dies, other times, the rpms will drop and go back up and idle very high around 2k. After cutting off, the car will turn back on normally. My boost gauge is telling me I am hitting 6psi.

The only thing I could think it is, is when installing the downpipe, I accidently snapped one of the bolts off, so only four bolts are holding the downpipe on to the turbo. Could a small exhaust leak be the reason this is happening?

Please help!

x_25

What kind of blow off valve setup are you using?

faviles5566

I am using a Bosch recirculating BOV. Thanks for responding!

x_25

As long as it is recirculating back after the MAF it should be fine. That was my only guess.

faviles5566

Here is a picture of the engine bay the BOV is right after the MAF

sixshooter

iTrader: (12)

LOL. BOV is plumbed wrong.

acedeuce802

iTrader: (1)

Where is that BOV hose going to?

faviles5566

I'm extremely embarrassed. What is wrong with it?

The hose is going to a nipple that was welded on a few inches after the throttle body

acedeuce802

iTrader: (1)

Does it idle?

tehzack

BOV mounted onto the intake side of the turbo? Poscat to you sir.

Girz0r

iTrader: (1)

Wtf is going on

Onyxyth

iTrader: (2)

You were pretty close, man. Here, I drew a sweet picture that should explain.

Onyxyth

iTrader: (2)

Also what's up with the washers on the exhaust manifold?

acedeuce802

iTrader: (1)

Your first diagram should work just fine. That's essentially how BEGI routes theirs, except with the BOV fipped. It's common to use that BOV flipped, as boost pressure helps it seal shut.

Onyxyth

iTrader: (2)

In that case, he'd still have to swap the "direction" of the BOV.

acedeuce802

iTrader: (1)

Direction of the BOV doesn't matter. It's just a piston that opens and allows air to flow. What he needs to do, is route that pre-throttle.

Forrest95M

IIRC soviet was using a similar BOV, he had it mounted halfway between the intake and cold side plumbing

Braineack

iTrader: (62)

Where is your idle valve connected?

NBoost

As long as that longer, ~1" diameter hose is going into the correct end of the BOV, this set up will work just fine. Where the BOV is mounted matters none, except for its sensitivity/response. It would operate better mounted on the charge pipe.

Girz0r

iTrader: (1)

Flip this the other way

Put it closer to the charge pipe on the cold side.

I'd swap your T fittings locations also, put them closer to the intake manifold and just side by side so manifold==t=t======emissions thingy