using bov instead of wastegate
i would like to hear it all jokes aside.
anyway that would be like using a VCR to play a DVD
they are different tools.
you can use a wastegate on a supercharger cold side setup and limit boost.
but a blow off valve does not have a bottom port, and the whole dynamic of it was not designed to bleed during high pressure situations only release air under vacuum and hold shut under boost.
basically the opposite of what you want a wastegate to do, most of the time.
TECH Apprentice
Joined: Mar 2012
Posts: 303
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From: Aus
I think he's thinking of an overboost valve. I had one on my inline 6 turbo falcon pickup. 490rwhp through a gt35r. 4L 6. 4" dump and out the side wouldn't net enough backpressure for the internal wastegate. So we fitted an overboost valve on the intake pipe before the throttlebody. Adjusted it on the dyno so it bled boost perfectly once it reached 16psi of pressure.
I think he's thinking of an overboost valve. I had one on my inline 6 turbo falcon pickup. 490rwhp through a gt35r. 4L 6. 4" dump and out the side wouldn't net enough backpressure for the internal wastegate. So we fitted an overboost valve on the intake pipe before the throttlebody. Adjusted it on the dyno so it bled boost perfectly once it reached 16psi of pressure.
TECH Apprentice
Joined: Mar 2012
Posts: 303
Likes: 0
From: Aus
http://www.nizpro.com.au/overboost_valve.html
That, you're not really supposed to use it as boost control. But it works..
That, you're not really supposed to use it as boost control. But it works..
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http://www.nizpro.com.au/overboost_valve.html
That, you're not really supposed to use it as boost control. But it works..
That, you're not really supposed to use it as boost control. But it works..
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Is there an RPM limit on a turbo?? if you ran a turbo up to desired boost pressure and then opened a relief valve on the compressor side, that thing is going to take off and spool like a ****!
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
do you have a theory on how this is supposed to work....?
i would like to hear it all jokes aside.
anyway that would be like using a VCR to play a DVD
they are different tools.
you can use a wastegate on a supercharger cold side setup and limit boost.
but a blow off valve does not have a bottom port, and the whole dynamic of it was not designed to bleed during high pressure situations only release air under vacuum and hold shut under boost.
basically the opposite of what you want a wastegate to do, most of the time.
i would like to hear it all jokes aside.
anyway that would be like using a VCR to play a DVD
they are different tools.
you can use a wastegate on a supercharger cold side setup and limit boost.
but a blow off valve does not have a bottom port, and the whole dynamic of it was not designed to bleed during high pressure situations only release air under vacuum and hold shut under boost.
basically the opposite of what you want a wastegate to do, most of the time.
Use a 4 port solenoid, then your ecu or a suitable controller and job done.
I use it for boost by gear and also boost by rpm via my ecu. It would probably be more difficult with a generic controller though unless it was a very good one.
The Mondo and BV57 have ports that are readily accessible, the big red I'm using takes a little work to access the bottom side of the diaphragm. Nothing difficult though.
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
A Wastegate can work too, but why buy another valve with a smaller operating range when you can use what you have ? It's neater and cheaper and works better.
Obviously it will depend on the flexibility of your controller though. Some generic boost controllers might be difficult to get it all to work properly and in that case a w/g would be easier.
i see absolutely no advantage to doing something like this on a turbo. you'll push the efficiency off the map and over spin the turbo.
if youre looking for overboost protection wire in a hobbs switch to cut power to the injectors when it is tripped. or you could just do what i did and zero out the ve table in the boost regions you want to cut. it cuts fuel and works perfectly. hit this about 20 times with my stock 5.3 with my cheap boost controller that spiked hard in the mid range. well back when i was afraid to go over 12psi.
if youre looking for overboost protection wire in a hobbs switch to cut power to the injectors when it is tripped. or you could just do what i did and zero out the ve table in the boost regions you want to cut. it cuts fuel and works perfectly. hit this about 20 times with my stock 5.3 with my cheap boost controller that spiked hard in the mid range. well back when i was afraid to go over 12psi.
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
i see absolutely no advantage to doing something like this on a turbo. you'll push the efficiency off the map and over spin the turbo.
if youre looking for overboost protection wire in a hobbs switch to cut power to the injectors when it is tripped. or you could just do what i did and zero out the ve table in the boost regions you want to cut. it cuts fuel and works perfectly. hit this about 20 times with my stock 5.3 with my cheap boost controller that spiked hard in the mid range. well back when i was afraid to go over 12psi.
if youre looking for overboost protection wire in a hobbs switch to cut power to the injectors when it is tripped. or you could just do what i did and zero out the ve table in the boost regions you want to cut. it cuts fuel and works perfectly. hit this about 20 times with my stock 5.3 with my cheap boost controller that spiked hard in the mid range. well back when i was afraid to go over 12psi.
i see absolutely no advantage to doing something like this on a turbo. you'll push the efficiency off the map and over spin the turbo.
if youre looking for overboost protection wire in a hobbs switch to cut power to the injectors when it is tripped. or you could just do what i did and zero out the ve table in the boost regions you want to cut. it cuts fuel and works perfectly. hit this about 20 times with my stock 5.3 with my cheap boost controller that spiked hard in the mid range. well back when i was afraid to go over 12psi.
if youre looking for overboost protection wire in a hobbs switch to cut power to the injectors when it is tripped. or you could just do what i did and zero out the ve table in the boost regions you want to cut. it cuts fuel and works perfectly. hit this about 20 times with my stock 5.3 with my cheap boost controller that spiked hard in the mid range. well back when i was afraid to go over 12psi.
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
Even Racelogic's traction control cuts injector signals for a power reduction.
Many dont like cutting spark only, because it can leave a scenario where there are large volumes of unburnt fuel getting chucked into a very hot exhaust.
But most aftermarket ecu's you can select between a fuel cut, spark cut or both, as well as the aggressiveness of the cut.
It's easy to think that could happen. But in reality, cut strategies on modern ecu's, that scenario just doesnt occur.
Even Racelogic's traction control cuts injector signals for a power reduction.
Many dont like cutting spark only, because it can leave a scenario where there are large volumes of unburnt fuel getting chucked into a very hot exhaust.
But most aftermarket ecu's you can select between a fuel cut, spark cut or both, as well as the aggressiveness of the cut.
Even Racelogic's traction control cuts injector signals for a power reduction.
Many dont like cutting spark only, because it can leave a scenario where there are large volumes of unburnt fuel getting chucked into a very hot exhaust.
But most aftermarket ecu's you can select between a fuel cut, spark cut or both, as well as the aggressiveness of the cut.
