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Manual Boost Control opinions wanted

How to go faster, stop quicker, and turn harder. Chips, exhaust, larger turbos, bigger/slotted/drilled rotors, high performance brake pads, manual boost controllers, performance shocks/struts/springs, airbox mods and more! Also discussion on HID and Xenon lights, aftermarket foglights and other exterior lighting.
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Volvo Repair Database Manual Boost Control opinions wanted

Post by msm15 » Sun Apr 05, 2009 8:07 am

Any suggestions on a manual boost controller ?

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Re: Manual Boost Control opinions wanted

Post by vegasjetskier » Fri Apr 10, 2009 10:34 pm

Just say NO.


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Re: Manual Boost Control opinions wanted

Post by csbrianp » Mon Apr 13, 2009 9:01 am sells Manual Boost Controllers for $40, the install in minutes and help increase the boost on your turbo. Beware, the 850 turbos have a fuel cut at 15lb of boost, so after installing your MBC if your car really starts accelerating quickly (and it will) then shuts down you have the boost too high. Even if you turn the boost down you still might hit fuel cut on cold mornings.


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Re: Manual Boost Control opinions wanted

Post by volvslow » Tue Jan 05, 2010 8:00 pm

i just received mine today actually! got it on ebay. i did some research on the cheap, no name brand manual boost controllers on ebay (oh you know they say "high performance turbo controller" on em). turns out some folks have written good reviews about them. its black includes the control valve, extra long vacuum tubing (to install in cabin), mounting hardware, etc... it controls 1-25 psi. 18.00 usd. probably going to drill a hole in one of the blank plates behind the steering wheel under the cluster and mount it there. figured i set it at a conservative 10psi. there is one that is cheaper. it just doesnt include enough vacuum line to run it in the cabin. but i see this being difficult to adjust. exmaple: floor it 50mph and watch the boost gauge, stop, pop hood, get out, open hood,adjust little knob, get in, floor it to 50mph watch boost gauge, stop adju.........get a boost gauge if you dont already have one.

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Re: Manual Boost Control opinions wanted

Post by dbm123 » Fri Jul 15, 2011 8:47 am

I thought about doing this to get a little more boost out of my V70 GLT..... does anyone have a pic showing the best way and place to put one of these inline if you do want it in the engine compartment????

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Work on negative pressure, positive pressure, or both?

Post by chax » Thu Jan 12, 2012 1:32 pm

My assumption was that an MBC would be installed between the boost control valve and the wastegate servo. I started looking for one on ebay, and got the impression that they might be installed in negative pressure vacuum lines only, and might not even be made for the positive pressure sent by an 850's BCV. This idea is supported by several schematics I saw of installation options. Assuming this is true, where would an MBC valve be installed in a '94 850 turbo? Or is my notion that they only work with negative pressure incorrect?
Thanks for your input!

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Manual Boost Control opinions wanted

Post by D_V_ENT850R » Thu Jan 12, 2012 5:45 pm

I ha e a boot controller on my car it's hooked up inline from the turbo outlet to the waste gate. It's tee-d off to the TCV so the ECU can still compensate for fuel and timing! I'm running the R @ 14psi steady! On the cold days the boost goes higher but I have tracked and marked down my settings for my MBC. It's got a scale marked on it that helps with settings I have 2 settings recorded one for warm days over 70 and days colder that 70. It helps not having to keep setting it everyday! Setting it up was yes, a little bit of a pain with driving pulling over setting and driving again but now that I figured it out it's fine. I bought a Prosport MBC $49.00. Really recommend an actual boost gauge not just the needle on the dash! That helps I'll see if I have any pics to post that might help if you need them!

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Re: Manual Boost Control opinions wanted

Post by tecatematt » Sat Jan 14, 2012 4:50 pm

I have a MBC laying around, reading this makes me tempted to try it.

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Re: Manual Boost Control opinions wanted

Post by dtm » Thu Feb 23, 2012 4:24 am

Installed mine this morning, in my S40 T4, and have set it to 1.2BAR, about 17.40456 PSI.

I have read quit a bite about this and without ECM/ECU remapping its as high has I should go.

According to my math the engine gained about 31bhp. I made mine. It costed me 10,80€. Very cheap way to gain horsepower.

My car is running on LPG, and because of the extra boost pressure I will have to adjust the LPG pressure as well, otherwise it keeps reverting to gas.

So far the engine runs very well and without a glitch.

Here is a photo of mine:

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Re: Manual Boost Control opinions wanted

Post by SweedSpeed » Sat Apr 21, 2012 9:13 pm

Hoping you guys can help me out...

I installed a MBC inline from the TCV to the wastegate. It does indeed work well, holding at 10 lbs as it was set to, but it does not allow the TCV to regulate boost pressure in the low gears. So rather than 5lbs in 1st and 2nd, where I set the actuator arm, it builds 10lbs in ALL gears and I'm really not tryin to buy a new cam shaft. Any ideas on how use the MBC so that the TCV will control boost in the low gears but allow more pressure to 3-5?

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