Bypass valve and wastegate questions.

[Dark Pony]

I have a bv57 bypass valve and was reading that it has some adjustment, however it seems that most say to just leave it open. I'd like to adjust it a little to make it close a little sooner than around 0 vaccum to help part throttle a bit. Is this OK? I assume that the only real issue may be that it won't vent all the boost at redline? If I test it and get no compressor surge, I should be good to go correct?

The bv57 is also kind of annoying just driving around. Sounds like I got a window cracked most of the time. If I decide to replace it, what would you guys reccomend that might be a bit quieter, or at least something that sounds better.

My paxton also has a beefcake torque booster with 10 psi spring. When I tested it, I noticed that crack pressure was around 5 psi or so, and obviously full open was @ 10. I'd like to try and keep it full closed until 10 to hopefully pick up a little power in the mid range. Will a MBC be able to help with that or does it need to be an EBC. I have heard conflicting info. Ive also heard that when using any boost controller, you want to use a spring that is a fair amount weaker than what you want your target boost at. For instance, if you want 12 psi, it would be easier for the boost controller to keep it sealed until 12 psi with a 5 psi spring in the WG instead of a 10 psi spring. Is this correct? Is this worth the time and effort? I can only assume it is, because until target boost is reached, it's just a boost leak, but idk. Thanks in advance for any help.

Sponsored

 

[ahl395]

Regarding your wastegate question, to do what you want and have the best control you'll need a boost controller with a 4 port solenoid. Your midrange will increase dramatically keeping the gate closed longer. Right now you are losing alot of your boost from the gate opening too early.

If you want 12psi use a 5psi spring in the gate. With a 4 port you can quadruple the spring pressure so 5psi spring is perfect. The eBoost Street is an affordable controller with all the features you need. The 4 port has the ability to hold the gate closed where the 3 port does not, do not skip this step. I've tried all 3 methods and speak from experience.

Keep in mind there still is a transition period. It cant be fully closed at 11 and fully open at 12. But you can lower the gap to 2-3psi. Read over the boost controller manual and get confident in how to use it. Trying to hold it closed too long (too high GP setting with too low of a SP setting on the eBoost) will result in a boost spike. Increase the numbers slowly as you tune it to make sure it's right.

Regarding the BOV question I'm not sure but I can't imagine adjustment would make any worthwhile difference. And most aftermarket options are louder from what I've read about it. Again, I've never used it personally though.

 

[Dark Pony]

Regarding your wastegate question, to do what you want and have the best control you'll need a boost controller with a 4 port solenoid. Your midrange will increase dramatically keeping the gate closed longer. Right now you are losing alot of your boost from the gate opening too early.

If you want 12psi use a 5psi spring in the gate. With a 4 port you can quadruple the spring pressure so 5psi spring is perfect. The eBoost Street is an affordable controller with all the features you need. The 4 port has the ability to hold the gate closed where the 3 port does not, do not skip this step. I've tried all 3 methods and speak from experience.

Keep in mind there still is a transition period. It cant be fully closed at 11 and fully open at 12. But you can lower the gap to 2-3psi. Read over the boost controller manual and get confident in how to use it. Trying to hold it closed too long (too high GP setting with too low of a SP setting on the eBoost) will result in a boost spike. Increase the numbers slowly as you tune it to make sure it's right.

Regarding the BOV question I'm not sure but I can't imagine adjustment would make any worthwhile difference. And most aftermarket options are louder from what I've read about it. Again, I've never used it personally though.

Thanks for your insight. I assume you've done this and picked up a fair amount of midrange back? Having looked at dynos of other paxton cars compared without a wastegate compared to mine, it didn't really look much different maybe mine made a tad more mid range, but not worth the extra effort. I'm assuming it's because the gate is opening around 5 psi out of the 10 that I'm sprung for. I've never used the car without the booster so I don't know what the difference is with and without. I was thinking of taking the booster off and seeing what it's like in the mid.

 

[ahl395]

Thanks for your insight. I assume you've done this and picked up a fair amount of midrange back? Having looked at dynos of other paxton cars compared without a wastegate compared to mine, it didn't really look much different maybe mine made a tad more mid range, but not worth the extra effort. I'm assuming it's because the gate is opening around 5 psi out of the 10 that I'm sprung for. I've never used the car without the booster so I don't know what the difference is with and without. I was thinking of taking the booster off and seeing what it's like in the mid.

I have a Procharger with a Wastegate so it's the same idea. I've ran it without the gate, with the gate on several different spring pressures, and with both a 3 port and 4 port boost controller.

With it properly set up the midrange boost is huge. Boost builds so much faster.

Keep in mind the gain you get from it is based on the pulley you run. I'm running the smallest pulley I can for the biggest increase. If you only put on a pulley for 1-2 psi over your target, you won't get much improvement.

 

[beefcake]

your only option for quieter is really a stock bov, but then your don't get alotof flow with those, all the largerones are going to be louder, as they move more air



Terry "Beefcake" Reeves
Office - 855-TBR-RACE - Cell 513-478-1965
Owner Team Beefcake - 20+ Years Experience
Deal Directly with the boss, no pushy sales guys!!!!!!!
https://www.beefcakeracing.com - Your Forced Induction Specialists

 

[Dark Pony]

I have a Procharger with a Wastegate so it's the same idea. I've ran it without the gate, with the gate on several different spring pressures, and with both a 3 port and 4 port boost controller.

With it properly set up the midrange boost is huge. Boost builds so much faster.

Keep in mind the gain you get from it is based on the pulley you run. I'm running the smallest pulley I can for the biggest increase. If you only put on a pulley for 1-2 psi over your target, you won't get much improvement.

True. I should probably run a 3.33 pulley, but I have a 3.47 right now. I am thinking of pulling off the TB for the time being and just using a 3.6 pulley until I get the a boost controller and the 3.33.

Sponsored