Tail q50 spring for vortech, which one?
Thread Starter
Joined: Aug 2010
Posts: 672
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From: cheam village, surrey
Tail q50 spring for vortech, which one?
Hey, I have searched this on google all morning and there’s no recent posts and still few different answers.
I have vortech v2 that is gonna be rebuilt by vortech and upgraded to a si and probably get a 3.8” pulley.
Currently running 399hp atw. I’m buying a tial q50 bov and the place I’m buying says they only have the 2psi spring for a supercharged set up and not the 3psi.
so I looked up Too see what spring is best and I’ve found people say 2, 3, 6 and 10psi springs for supercharged but all old threads. Please can someone advise on what they use and what’s the most commonly used on supercharged now.
Thanks.
I have vortech v2 that is gonna be rebuilt by vortech and upgraded to a si and probably get a 3.8” pulley.
Currently running 399hp atw. I’m buying a tial q50 bov and the place I’m buying says they only have the 2psi spring for a supercharged set up and not the 3psi.
so I looked up Too see what spring is best and I’ve found people say 2, 3, 6 and 10psi springs for supercharged but all old threads. Please can someone advise on what they use and what’s the most commonly used on supercharged now.
Thanks.
Joined: Oct 2008
Posts: 6,765
Likes: 2
From: Bay Area, California
i had a 2psi spring on my v2, but changed to a 6psi after some time. even at 6psi, it wasn't enough for me. ended up getting a vortech race adjustable bypass valve and have it currently at 10psi and it's great.
with the 6psi, i felt like the throttle response was a bit slow vs the 10psi on the vortech bypass valve.
also, when my tuner was trying to tune with the 2psi and 6psi spring, they had to add more fuel to compensate all the boost pressure being pushed out of the BOV since the valve wouldn't close unless you're at 90-100% accel on your gas pedal.
with the 6psi, i felt like the throttle response was a bit slow vs the 10psi on the vortech bypass valve.
also, when my tuner was trying to tune with the 2psi and 6psi spring, they had to add more fuel to compensate all the boost pressure being pushed out of the BOV since the valve wouldn't close unless you're at 90-100% accel on your gas pedal.
Thread Starter
Joined: Aug 2010
Posts: 672
Likes: 0
From: cheam village, surrey
i had a 2psi spring on my v2, but changed to a 6psi after some time. even at 6psi, it wasn't enough for me. ended up getting a vortech race adjustable bypass valve and have it currently at 10psi and it's great.
with the 6psi, i felt like the throttle response was a bit slow vs the 10psi on the vortech bypass valve.
also, when my tuner was trying to tune with the 2psi and 6psi spring, they had to add more fuel to compensate all the boost pressure being pushed out of the BOV since the valve wouldn't close unless you're at 90-100% accel on your gas pedal.
with the 6psi, i felt like the throttle response was a bit slow vs the 10psi on the vortech bypass valve.
also, when my tuner was trying to tune with the 2psi and 6psi spring, they had to add more fuel to compensate all the boost pressure being pushed out of the BOV since the valve wouldn't close unless you're at 90-100% accel on your gas pedal.
Joined: Apr 2012
Posts: 1,762
Likes: 42
From: Hertfordshire
I have always used the softest spring and never had an issue. If you use a really strong spring then the BOV/BYPASS valve will close at really light throttle openings. I cant see why a lighter spring would require more fuel on the map as all of the boost pressure would be dumped before it ever got near the inlet manifold. On a supercharged car you only really want boost when pushing on, the rest of the time you want it bypassing to aid fuel economy and wear on the charger. Another key thing with a bypass valve or BOV is making sure you use the right size vacuum line as this makes a big difference to the response of the valve especially when you lift off and you want the valve to open fully under vacuum.
Joined: Oct 2008
Posts: 6,765
Likes: 2
From: Bay Area, California
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Thread Starter
Joined: Aug 2010
Posts: 672
Likes: 0
From: cheam village, surrey
I have always used the softest spring and never had an issue. If you use a really strong spring then the BOV/BYPASS valve will close at really light throttle openings. I cant see why a lighter spring would require more fuel on the map as all of the boost pressure would be dumped before it ever got near the inlet manifold. On a supercharged car you only really want boost when pushing on, the rest of the time you want it bypassing to aid fuel economy and wear on the charger. Another key thing with a bypass valve or BOV is making sure you use the right size vacuum line as this makes a big difference to the response of the valve especially when you lift off and you want the valve to open fully under vacuum.
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