throttlebody vac/boost
04-20-08, 02:34 PM
#4
Ports that always read vacuum even when the car is under boost would be like the nipple in the turbo inlet duct that pulls crank case and evaporative emmisions. It has an entry perpendicular to flow to create a vacuum and it never sees turbo boost.
A nipple that only sees boost would be one where the entry is inline with the airflow and after the turbo like the throttle body nipple that feeds boost to the top of the fuel injector air bleeds and the oil injector tops to normalize their flow.
A nipple that sees vacuum and boost would be like all the other nipples on throttle body and manifolds that are after the turbo and have and entry perpendicular to flow which creates vacuum that the turbo then overcomes with boost.
A nipple that only sees boost would be one where the entry is inline with the airflow and after the turbo like the throttle body nipple that feeds boost to the top of the fuel injector air bleeds and the oil injector tops to normalize their flow.
A nipple that sees vacuum and boost would be like all the other nipples on throttle body and manifolds that are after the turbo and have and entry perpendicular to flow which creates vacuum that the turbo then overcomes with boost.
04-20-08, 02:52 PM
#5
Ports that always read vacuum even when the car is under boost would be like the nipple in the turbo inlet duct that pulls crank case and evaporative emmisions. It has an entry perpendicular to flow to create a vacuum and it never sees turbo boost.
A nipple that only sees boost would be one where the entry is inline with the airflow and after the turbo like the throttle body nipple that feeds boost to the top of the fuel injector air bleeds and the oil injector tops to normalize their flow.
A nipple that sees vacuum and boost would be like all the other nipples on throttle body and manifolds that are after the turbo and have and entry perpendicular to flow which creates vacuum that the turbo then overcomes with boost.
A nipple that only sees boost would be one where the entry is inline with the airflow and after the turbo like the throttle body nipple that feeds boost to the top of the fuel injector air bleeds and the oil injector tops to normalize their flow.
A nipple that sees vacuum and boost would be like all the other nipples on throttle body and manifolds that are after the turbo and have and entry perpendicular to flow which creates vacuum that the turbo then overcomes with boost.
04-20-08, 02:55 PM
#6
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Sorry did not know what u had i thought S5 but if u got to FAQ and manuals u can find out and u can also DL all the manuals so if u ever have a Q u might beable to A it befor u ask.
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04-20-08, 04:37 PM
#9
Yes it is messed up, I posted that a while ago as a tentative plan vac routing. That setup didn't let the boost gauge work, I moved the hose to nipple 1 since I didn't need the twin scroll since I upgraded to the BNR turbo.
I was in the process of removing emissions, the diagram was a visual aid in this thread which ends up looking different by the end. There's also an explanation of which nipples show boost/vac in my thread below-
'87 TII Throttle Body Vacuum Nipple Question - Just Double Checking - Please Verify
I was in the process of removing emissions, the diagram was a visual aid in this thread which ends up looking different by the end. There's also an explanation of which nipples show boost/vac in my thread below-
'87 TII Throttle Body Vacuum Nipple Question - Just Double Checking - Please Verify
The only nipple on the back that reads vacuum is the very bottom one.
And 7 does not go to the water thermowax. The thermowax has no vacuum assist on it. The 7 goes to the water thermo valve, a different item altogether.
The 4, 5, 6 all lead to passages prior to the throttle plates.
And 7 does not go to the water thermowax. The thermowax has no vacuum assist on it. The 7 goes to the water thermo valve, a different item altogether.
The 4, 5, 6 all lead to passages prior to the throttle plates.
04-20-08, 04:56 PM
#10
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so u "T" the bov and the boost sensor to the same spot on the pass side of the uim?
I figured running the bov to one of the front ports...
the boost sensor goes to the pass side of the uim
and the boost gauge to the bottom on the back of the uim
I figured running the bov to one of the front ports...
the boost sensor goes to the pass side of the uim
and the boost gauge to the bottom on the back of the uim
04-20-08, 06:31 PM
#12
some people argu to leave the map sensor with its own vac source and t something else.
i had mine t'ed with bov and boost gauge and left map sensor alone. i used map sensor or the side of UIM and the bov/boost gauge on i think the bottom front vac port on manifold
i had mine t'ed with bov and boost gauge and left map sensor alone. i used map sensor or the side of UIM and the bov/boost gauge on i think the bottom front vac port on manifold
04-20-08, 06:32 PM
#13
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I just figured u would want them each on their own besides the bov atleast on my setup will be as close to the tb as I can get it.. I don't want to run the vac line all the way to the other side of the intake
05-13-08, 08:14 AM
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OK I am going to update this the best I can and get some things figured out (or try to)
I have my boost sensor by itself on the pass side below the bac valve
I have my fuel pressure regulator on the inside of the lim ont he sideways nipple
For the 3 nipples on the front of the S4 throttle body
I have the top 2 capped off
the bottom one going to the top port on my BOV (bottom nipple on bov capped)
For the back of the TB (4 ports)
I currently have them all capped off
my boost gauge will go on the lower most nipple in the rear
this is how my car is setup, I have no twin scroll, no vac spider, no bac valve, egr etc.
NJGreenBudd IME it is best to have the BOV closest to the TB as possible the reason why is because you want all of the back pressure in the charge pipes to be expelled BEFORE it can get to the compressor (causing compressor surge).
I have my boost sensor by itself on the pass side below the bac valve
I have my fuel pressure regulator on the inside of the lim ont he sideways nipple
For the 3 nipples on the front of the S4 throttle body
I have the top 2 capped off
the bottom one going to the top port on my BOV (bottom nipple on bov capped)
For the back of the TB (4 ports)
I currently have them all capped off
my boost gauge will go on the lower most nipple in the rear
this is how my car is setup, I have no twin scroll, no vac spider, no bac valve, egr etc.
NJGreenBudd IME it is best to have the BOV closest to the TB as possible the reason why is because you want all of the back pressure in the charge pipes to be expelled BEFORE it can get to the compressor (causing compressor surge).
05-13-08, 03:31 PM
#16
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Yes it is messed up, I posted that a while ago as a tentative plan vac routing. That setup didn't let the boost gauge work, I moved the hose to nipple 1 since I didn't need the twin scroll since I upgraded to the BNR turbo.
I was in the process of removing emissions, the diagram was a visual aid in this thread which ends up looking different by the end. There's also an explanation of which nipples show boost/vac in my thread below-
'87 TII Throttle Body Vacuum Nipple Question - Just Double Checking - Please Verify
I was in the process of removing emissions, the diagram was a visual aid in this thread which ends up looking different by the end. There's also an explanation of which nipples show boost/vac in my thread below-
'87 TII Throttle Body Vacuum Nipple Question - Just Double Checking - Please Verify
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