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Turbosmart Dual Port BOV Test

2/19/2014

5 Comments

 
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Ever wondered if the aftermarket Blow Off Valves “BOV” really work or what can they do for your car? Well we did some testing with our 2014 Subaru STI using Turbosmart’s Subaru Dual Port BOV. Info on the car: It’s a Stage 2 STI, only mods are turbo back exhaust, Turbosmart FPR-800, and a Cobb Tuning Accessport Protuned by Snail Performance. We strapped the car on the dyno, then got everything warmed up and ready to go. We started out with the Turbosmart Subaru Dual Port BOV installed and fully tuned the car running just under 19psi of boost. After getting the tune dialed in we swapped out the Turbosmart Subaru Dual Port BOV for the factory BOV the STI comes with stock from Subaru. Now with the stock BOV installed we did some dyno pulls with the same tune and what the graph showed is pretty crazy.
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This dyno graph shows the boost curve. “Solid line is the Turbosmart Subaru Dual Port BOV / the Dotted line is the Stock BOV”. As you can see the stock valve is not able to hold the higher boost pressures that the Turbosmart BOV can in the early RPM range. Turbosmart BOV peak boost is 18.6psi and the Stock BOV is 17.8psi but that is just peak boost the graph shows the real gains. Check out how much quicker the boost comes on about 150rpms over the Stock BOV.
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This dyno graph shows the horsepower, torque, and boost curve. So you can see the difference in power and torque. Not being able to hit the target boost pressure with the stock BOV the STI’s torque curve is lowered by 13 lbs. So the question “does a BOV add power?” has been answered why yes it can because boost pressures aren’t lost.
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So next time you are looking at a BOV and thinking it only just adds sound think again. It can actually do more than the cool blow off sounds between shifts. For more information on the Turbosmart Subaru Dual Port BOV, check out this link.

Turbosmart Subaru Dual Port

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5 Comments
Skizz
3/11/2014 12:15:19 pm

Wouldn't re-tuning the car for the stock BOV net different results since the car is tuned for the turbosmart and not the stock?
Is this dual port the better aftermarket BOV style over the aftermarket stock style BOV that only vents back into the inlet?

Reply
skizz
3/11/2014 12:23:35 pm

I want to add, Thank you Snail for doing this kind of test and sharing it with the rest of us. The community needs more shops/vendors like you,

Reply
Snail Performance
3/11/2014 12:33:19 pm

Skizz,

The idea of the test was to show how the stock valve isn't able to hold the boost pressure after the car being tuned with a quality BOV. There is no differences in the BOV the vent to the ones that vent back into the intake just one makes sounds.

Reply
Christian
9/6/2019 07:19:17 am

Newbie Question --

I was going to purchase the TS Kompact version for my 2013 WRX because I've read that the car does not perform well venting to atmosphere. During your test, was the TS BOV set to full recirculating or venting to atmosphere? Do I need a re-tune if venting to atmosphere?

Thanks and loving the car since getting it tuned by y'all.

Reply
Charleston Solar Panels link
9/5/2022 03:33:44 am

Great reading your blogg

Reply



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Snail AZ

155 Borland Ave
Auburn, CA 95603
916.341.9888

3327 N 35th Ave
​Phoenix, AZ 85017
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  • Home
  • Services
  • COBB Tuning Support
    • Accessport Custom Map Install
    • 2015+ STI COBB OTS Map Info
    • Data Logging
    • AP Serial Number
  • ECUTEK Support
    • ECU Connect Programming Kit
    • Support Vehicles
    • EcuTek ProECU Download
  • Contact
  • Base Map Request
  • Apparel
  • Journal
  • Product