46 replies to this topic

[leadfoot]

That's how I have it I've read if the t fails or the gauge fails the leak can cause the regulator to not correctly

[warbo]

Umm any chance of a sketch or similar showing where to t in for a guage, where aftermarket bov to atmos, and where to connect tube from microtech ecu.? My engine bay looks like a dogs breakfast and don't want same problem as experienced above . Using OEM fuel reg if possible.

[leadfoot]

I'm one my phone ATM will post tonight if I remember

[jack be nimble]

Its in my overboosting thread.
Im on phone too, will try to find it

[jack be nimble]

http://www.4gtuner.c...ator-tdo5-b16g/

[leadfoot]

Yep that's the factory two port method for boost control

Boost gauge is just teed into the fpr line and I'd probably put your microtechnology map sensor line in the same source. Bov has its own nipple after the throttle body

[TRQ-STR]

 

both are ok.....

 

when it is in the manifold you get a true boost at the valve reading. if the boost is too high the actuator opens so all good. when you get off the throttle there is no boost in the manifold and the actuator shuts...simple

 

my preference right or wrong is detect boost from the manifold

 

Also, the turbo tends to run a few more psi this way as the wastegate looks past the pressure drop to satisfy the source requirement.

 

Bov -> vacuum source after throttle

 

Agreed, the vac off throttle will help the bov overcome spring pressure.

[Iceey]

So long story short ?

[BMGTZ]

its fine where it is as long as it is doing the job

[Iceey]

Awesome ^^,

How bout the surging ?

[Geo&Kez]

Did you try the plumb back as opposed to atmo to see if it still occurs?

[Geo&Kez]

I've been doing some searching and it says the wastegate actuator should be plumbed before the throttle plate ? Is this true ?

I had a look at where my is plumbed and it's connected to a T piece .. One leading to the BoV and the other after the throttle plate .. Is this right ?

 

Not trying to sound stupid, but if the shoe fits..... When you jump off the throttle, the manifold pressure on the engine side of the throttle plate will/should instantly drop/return to vacuum. If your bov line is connected here, this pressure drop reduces the pressure on the spring side of the bov and PFFFT, the sound we all love.

 

If it's on the other side of the throttle plate, you jump off the throttle and the pressure still exists for a short time doesn't it? This would then be delaying the opening of the bov for that same short time, which in turn I imagine could cause some compressor surge as the compressor pushes against a closed head?

 

Or have I missed the point?

Edited by Geo&Kez, 10 February 2014 - 02:24 AM.

[jack be nimble]

Hey geo, what about idle and decel. The engine vacuum will suck open the bov, allows air to bypass the turbo, intercooler and all. If its not recirc then its sucking unfiltered air and bypassing the maf. Even cruise may be with the bov open and air shortcutting.
They are so smart.

[leadfoot]

this is why plumb back are better. if you using a vent to atmo you have to ensure it is closed at idle by increaseing the srping pressure until the vac source cannot overcome it

[Geo&Kez]

As K has eluded to, that's what I thought the spring adjustment was for? Maybe given I make fuckall vacuum at idle with the cams and stuff, it has not been an issue for me. 

[jack be nimble]

this is why plumb back are better. if you using a vent to atmo you have to ensure it is closed at idle by increaseing the srping pressure until the vac source cannot overcome it

Decel as well?

[Geo&Kez]

My springs got easily enough tension to keep it shut at those vacuums, but now I'm all confused and interested, I'm going to stick a vac pump on it tonight and see if mines been cracking open on decel. 

Edited by Geo&Kez, 10 February 2014 - 05:43 AM.

[jack be nimble]

Did my head in when I thought about it. Unfiltered air is bad.

[Cranked]

Wouldn't the intercooler pipe be at the same vacuum? Thus negating any vacuum on the back of the bov.

[leadfoot]

no it will not cranked because after the throttle body will be at vacuum while before will be at 1 atmo.

the way you want it is closed at idle but only just enough so that the combination of vacuum and boost pressure in the inter cooler lines can overcome the spring and vent. with a plumb back you can let it be open at idle etc as it can help throttle response by allowing a shortcut for the air and thus shorter intake path