khubner1
Moderator
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
Car surges after boost ? Pls help
- Thread starter Iceey
- Start date
Help Support 4GTuner:
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.
khubner1
Moderator
I'm one my phone ATM will post tonight if I remember
4piknup
master of none
Its in my overboosting thread.
Im on phone too, will try to find it
Im on phone too, will try to find it
4piknup
master of none
khubner1
Moderator
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
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
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.BMGTZ said:
Agreed, the vac off throttle will help the bov overcome spring pressure.khubner1 said:
BMGTZ
Grumpy old man from the school of hard knocks
its fine where it is as long as it is doing the job
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.Iceey said:
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?
4piknup
master of none
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.
They are so smart.
khubner1
Moderator
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
4piknup
master of none
Decel as well?khubner1 said:
4piknup
master of none
Did my head in when I thought about it. Unfiltered air is bad.
Cranked
Donating Members
Wouldn't the intercooler pipe be at the same vacuum? Thus negating any vacuum on the back of the bov.
khubner1
Moderator
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
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
