Hi, i’ve an Seat ibiza fr 1.8t 20v 2005 150 hp, Question: What´s the right bov that i’ve to install in that car cause i’ve installed another bov’s and my car loose power, thank’s.

Jorge,

a dual port kompact would be the best of both worlds and give you the ability to change it in the future to full atmospheric or plumb back if need be. Just make sure that the installation of the valve is in the correct orientation as most aftermarket valves are in the opposite orientation compared to the standard Bosch valve.

Hi there.
What is the exact reason for upgrading from the plastic bosch BOV to the turbosmart version? I have an older Nissan skyline which had no BOV from factory and a few years ago installed one of these plastic bosch items.
I’ve had a loss of performance and was told that the BOV was likely leaking? I didnt think it possible to leak as theres pressure supposedly holding it shut isn’t there?
My partner heard me talking about one of these Kompact BOVs and bought me a full plumb back 25mm item.
As the Kompact is physically larger than the plastic thing it wont fit as a replacement in the same position so I plan to relocate it (to where it should have originally been put) to just before the throttle body. Can I run the plumb back version venting to atmo without any ill effects? Is it just the trumpet differing it to the atmo versions as I dont care what sound it makes as long as it works.
Note I have an aftermarket ecu and the AFM is no longer being used.

To summarise:

Can the bosch items leak? What else goes wrong with them?

Can I use KTPB-25 in a vent to atmosphere application?

My car currently makes 250kw at wheels on 17psi when previously it made 280 (same dyno and no inlet temp fiddling) and was told the bov is leaking.

thanks in advance.

Jayson,

The Bosch items are prone to leaking even on standard vehicles. The diaphragm they use to actuate the plunger is rather flimsy and can be torn quite easily with low boost levels.

The KTPB-25 you have cannot be used in a vent to atmosphere application. The spring in it is designed to allow the piston to be open at idle. This will allow unfiltered air into your intake system which is not good. You can change the spring to our vent to atmosphere spring (FG-BVS-SPKTSS) which will allow you to run your BOV in vent to atmosphere mode.

Hi,
Currently i’m using stock BOV on my Mazda B8 turbo. I’ve been told that stock BOV can only hold boost up to 0.7 bar only. Just wondering if i replace turbosmart Plumb Back or Dual Port BOV, how max boost can it hold up?

Thanks

Fahmi,

Our 38mm BOV’s can handle more than 40 PSI of boost

I installed the Kompact Dual Port BOV on my standard FG XR6T, works well, really happy with it, what I’m wondering though is what colour/tension spring do they come with as new? and is it possible I may need one of the higher tension springs in the valve. When I first installed it and had it on soft setting I noticed that even just with the engine idling the atmo discharge port was slightly open. would that be because of not enough vacuum or too softer setting? So I screwed the cap all the way in to the fully hard setting which has now closed off the atmo port but I’m wondering if the plumbback port may still be slightly open all the time and boost is going back into the intake? It hasn’t seemed to affect performance at all so I think it’s ok but I noticed the valve opens to atmo very easily when driving. It is a manual transmission so i know this would add to the effect, but the discharge doesn’t sound much different with only a small amount of throttle and short shift compared to wide open throttle and reving right out. If the plumb-back port is slightly open all the time would this be bad for the engine/turbo and wouldn’t it affect performance? It just seems to open to atmo very easily and its on the hardest setting whereas i thought being dual port it would only release to atmo under race conditions? don’t get me wrong I’m really happy with it i just want to make sure it is set up right. Thanks in advance.

DJ,

The spring that comes with the dual port is our mid range spring which is green. There is a harder spring which is pink designed for all of our atmo valves. The plumb back port can be open at idle and will have no effect on performance whatsoever. Tha amount of air it is venting back into the intake is still within the system after the airflow meter so it won’t affect the ECU at all. The valve is designed to have a quick response which would mean that even on small throttle movements, the valve will vent. By the sounds of it, your valve is perfectly setup.

Thanks for your help, couple more questions, you said the plumb back port can be open at idle with no ill effect is it the same with the atmo port? if the atmo port is a tiny bit open at idle on softest setting is this still ok? and why does that happen, just because the vacuum is lower at idle? so as soon as you rev the engine it should increase vacuum and shut off? also would there be much difference in discharge sound between soft and hard setting or is it always pretty much the same? Thanks very much! :)

DJ,

The atmo port should be fully closed at idle. This is to ensure that all the air that the airflow meter has measured entering the engine is not leaking out somewhere else. Also, it means that there is no unfiltered air entering the intake system.

An engine has close to maximum vacuum at idle because the engine is trying to suck air through a closed throttle. As soon as you touch the throttle, you’re allowing air into the engine more easily which will drop the amount of vacuum in the manifold. The noise is pretty much the same on large back offs. Adjusting the cap essentially changes the response of the valve to light throttle changes but also to tension the spring so that the atmo port is closed at idle.

i have a audi s4 2.7 twin turbo,. im looking at a set of Dual Port
Part Numbers:
FG-BOV-KTDP20 (20mm), FG-BOV-KTDP25 (25mm

would that application be ojk for my car or do i need the
Audi V6 Twin Turbo Dual Port
Part Number: FG-BOV-KTDPV6

i have about 18lbs of boost but getting a controller to set 20lbs on K03/K04 hybrid turbos.

thanks

Logan,

Unfortunately, the Audi V6 Twin turbo dual port kit has been discontinued. You would need to get a set of 25mm plumb backs rather than dual ports as the dual ports won’t fit where the factory bypass valves are. These valves will work well on your car and handle the boost increase with ease.

Hello,

I have a 2004 Audi A4 1.8T. Which BOV would you advise for my car?

Jamal,

Any of the Kompact 25mm BOVs will be a direct replacement. The dual port is a good choice as it gives you flexibility.

hi, Have a NEW FG FPV F6, wondering what is best suited for this vehicle

Craigh

A Kompact Dual port 25mm will be a perfect upgrade however, the top cap does slightly touches the cam cover.

I purchased the FG-BOV-KTSS20 and require an aluminum weld on adapter to make the installation possible. will the FG-ADA-WA38 work? and if not what will i need? and if you don’t have it where can i get it?

Thanks
Aaron

Aaron,

Since the kompact BOV has a 20mm hose end for the inlet, you can simply weld on a 20mm pipe onto the intercooler piping and then use a piece of silicone hose to link it together.

Jack,

You will need a adapter kit to fit a dual port on your vehicle. The part number for the adapter is TS-0205-2051.

Hi,
I want to get an adjustable BOV for my 2009 VW Tiguan 2.0TSI. I need to retain some recirculation to keep the ECU happy but I do want more noise than the stock Bosch piston type diverter valve provides, although I am worried about possible CEL issues. Do you have a model that would fit straight up to my vehicle in these specs?

Cheers
Simon

Simon,

Unfortunately we do not have a direct fit BOV for your vehicle, you will need to modify pipework to make ours fit. A dual port will give a 50/50 diversion of air and the ports are staged so that on small back off, it will only be plumb back

I was just wondering if your Kompact Supersonic BoV will fit my 1997 VW Jetta TDi turbo Diesel. I believe it has a recirculating one from factory atm. If theres a chance it would mess with my ECU then would the dual fit? thanks in advance!

Kyle,

If it has bosch style one from factory, then the Kompact series will also fit. Normally though, turbo diesel engines from factory do not use any BOV or bypass valves.

Hi technical, i an interested in your duel port bov, i have an a3 1.8t, the engine management has a bosch maf,it seems that it recirculate the air back into the system from the bov.
if i get a duel ported bov off you, wont this mess with your air and fuel mixture or running performance due to the air that is accounted for threw the maf is acctually getting spat out into the atmosphere from the bov?
regards aaron

Aaron,

With the dual port, only a portion of the air is being vented out of the system during back off’s so the air/fuel mixture will only be marginally affected during back off’s only which is not an issue. Hence, it will not affect the running performance of the engine.

I have the dual port… how do i get these other springs so i can change it to 100% recirc??

i have a volvo s60 2.4t wich one should fit my car?

Joe,

If you already have a dual port, you can just use the supplied blanking plug to block up the trumpet to make it 100% recirculation.

Daury,

If your engine uses a compressor cover mounted BOV, then we do not have something off the shelft to suit. If it comes with a plastic Bosch valve, then the Kompact valve will directly replace that part.

so.. if hi understand correctly.. the “softer-harder” will not affect the boost but only the response of the valve.. so .. softer will swoosh easily.. am I right?

Remi,

Yes, you are correct.

Hi Tech Support,

Im running a supercharged 4L 6cyl AU Falcon. Its currently running 7psi boost at 5500rpm and I will be looking to increase it to 9-11psi at 5500rpm.

Im running your 25mm Kompact Dual Port BOV and have wound the unit to its softest setting. I have put a blanking plug to one side and the trumpet to vent to atmo on the other side. Its been working great at 7psi with no issues to date.

But when I am ready to increase boost to 9-11psi, will the unit Im using be sufficient to vent without causing problems? Is this 25mm unit sufficient at venting enough air to avoid damage to my supercharger?

I plan to plumb it back into the intake of the blower later on, will doing this affect the amount of air vented at higher boost pressures?

Thanks for your help

Regards
Shav

Shav,

What sort of power figures is your engine producing at 7 PSI and what sort of power levels will you achieve at 9-11 PSI?

Plumbing the BOV back will have negligable affect on the amount of air vented.

Hi Tech Support,

Currently making about 194rwkw or about 250kw at the engine.

With about 9psi and an intercooler, I hope to get about 210-220rwkw or about 260+ at the engine.

Its an auto trans by the way too.

Thanks for your help.

Regards
Shav

Shav,

The BOV you have should be fine for your power output.

I have a set of Kompact Series dual ports on my 2.7t audi. Recently developed a boost leak. Changed the throttle body boot. Did a pressure test and the diverter valves were leaking. Is there any way to rebuild then. Used to boost 15lbs, now can’t get over 9lbs. It’s killing me. Thanks for your time.

Leslie

Leslie,

Where is the air leaking out from? Where did you apply pressure to do the leak test? How long have you had the dual ports on your car?

I have a 2006 Mazdaspeed 6. I was told that VTA is not the answer to these engines and it will actually decrease performance. I heard BPV is a better solution. Is this true? What bpv do you reccommend?

hey tech ive recently purchased a fg f6 n am wondering how easy it is to fit the 25mm bov use talked about previously being a perfect fit for my car and what are the benefits over the standard bov?..I am chasing a louder sound ive modified the stock exhaust it is loud and the standard turbo spools rather loud bov noise is the only thing missing really

thanks

Brandon,

It depends on what you want. Both will have the same performance gain but the VTA will have noise where as the BPV will be quiet. For your Mazdaspeed 6, a good upgrade is our Kompact Mazda BPV. If you were thinking about doing alot more to the engine later on, then our 38mm Dual port would be a better option as it can flow more air.

Mitchell,

Our Kompact 25mm BOVs are direct replacements for the standard valve on your car. Our valves will give you better throttle response and can handle higher boost. The Kompact Dual port will suit your needs and will give you the noise you’re after.

I pressurized the entire intake system with a tool similar to this (http://exaltmotorsports.com/i-157171-awe-2-7t-s4-intake-pressure-tester.html) The only leak I could find was from the DVs. Just to make sure, I swapped them out with a set of stock ones I had. No leaks. Problem is the stock ones won’t be able to handle the extra boost pressure for very long.

I then pressurized the DV itself through the high pressure turbo side of the valve and found it to be leaking through the part where the two halves of the main body are threaded together as well as out the ends that are hooked to the vacuum line and return to the intake.

I bought them from a friend who had them on his car for almost a year, and I had them on my car for about a year and a half. So in total, they have less than three years total.
I love them, and haven’t had any problems till now.

Leslie

thanks tech also im just wondering what is the difference in the sounds released ie the ones that just sound like they dump all the air in one go and the ones that sound half like a turkey like that gobble gobble sound lol…mine is the turkey sounding 1 atm just quiet and im wonderin if it will keep that sound with your valve and just be louder or whether it will sound exactly like the soundbite of the dualport on the u tube vid

thanks again

Leslie,

Where did you first place the tester to test for leaks? Due to the design of the BOV, there is a small tolerance between the Bore of the body and the piston. Over time, without maintenance, dirt can get in between the piston and bore, which over time, will wear out the BOV. But unless the valves are in there open position when on boost, the small amount of air leaking from the tolerance gap will be too small to affect the overall boost provided by the turbochargers. Try driving the car with the stock valves to see if you still have a loss of overall boost. If they have the same problem, then you need to check other parts to make sure they are not faulty.

Mitchell,

The turkey sound is actually no good as they are signs showing that your turbocharger is cavitating. The valve should dump the air in one go. If you have a plumb back, then it will sound very similar to what the standard one is now. The sound of the dual port will be the same as what is on the video.

Thanks for a great product at an affordable price. Just picked up and installed your Kompact dual port (25mm) for my FG XR6T.

Perfect blend between overt show off and covert sleeper. On an auto it can be driven to be silent or to make a bit of noise if one is that way inclined.

More importantly, it’s ALL AUSTRALIAN and built to perform and last. An essential add on for those running some mods and greater boost!

Thanks guys!

Nolan,

We appreciate your comments and hope that we can continue to exceed customer expectations on all of our products.

Please would you advise the next highest “k” value spring for the Dual Port BOV as the piston is open at idle on my FG XR6T.

Regards,
Mark.

Mark,

The next spring up is the pink spring (TS-0203-3002)

Hi again,

after reading what ‘Mark’ had to say I went and checked my car at idle. I notice that the piston bobs up and down a few mm and upon closer inspection I can feel that it is letting out air at idle.

Is this normal or should I be looking a firmer spring? If so is this a cost that I have to foot, and could you give me information on it’s installation.

cheers.

Nolan,

It is best to get a firmer spring as the piston should be closed at idle. The part number you need is TS-0203-3002 for the pink spring.

hi i have a dual kompact that i have vta on my 1995 wrx impreza and its on the hardest setting but still bobs about on idle is there a higher tension spring i can buy?

i have bullitt mustang with a procharger making 7.5 pounds of boost max and was wondering what would be better the dual port or the plumb back i have a bosch unit right now and want to upgrade.i would like a bov for the sound but have been told a bov would mess with my mass air giving me a rich/lean mix can i use the dual port and get that great sound and by pass at the same time or just stick with a full on plumb back.

Leroy,
the 38mm Plumback is ideal for this application.
Would love to see some pic’s of your ride – sounds like a beast :)

Neil,
you need the TS-0203-3002 Pink spring – it is the hardest spring for the Kompact range.

What’s the best way to go with my TRD superchager’s bosch bpv, the kompact dual port or the plumb back port bov?

Abraham,
the Kompact plumback will be the right choice for your application.

how much boost can the 25mm version hold? im currently spiking close to 30 psi… this is on a 2006 VW GLI FSI 2.0t with a full turbo upgrade.. power figures are about 370hp at the crank. however i do have a DV relocation on my car which does allow me to run any valve that is 1“in diameter.. and i like the dual port one just for having the sound :) will this work fine for me?

Derick,

Our valves can hold more than enough pressure for your vehicle. The Dual Port 25mm will work fine for you. Just make sure that the standard valve on the compressor cover of the turbocharger is blocked off

Tech,

So even with the turbo upgraded (running a k04) with 370hp at roughly 24psi this valve will do? if you are sure than i will deff be ordering it

Derick,

You stated that you have a DV relocation which allows you to run any valve that is 1” in diameter. If you are not restricted by this 1” inlet, then a 38mm valve will be must better for your setup.

Tech,

I am restricted to running the 1” valve so unfortunatly the 38mm would not work that’s why I wanted to make sure that the 25mm would be good enough cause I can’t go larger than that. So the final answer is will it work for my setup?

Derick,

The kompact 25mm dual port will work for your setup.

hi there, do you have a kompact plumb back bov for the earlier wrx’s and forester GT?

i have an 86 porsche 951 im stock my bypass valve died. what system would work well with my car?

Dave,

To fit a Kompact Plumb back will require some fabrication to your existing pipe work. However, we do have adapter kits to fit our 38mm BOV’s to the earlier WRX and Forester GT.

Israel,

If the standard valve was a black plastic Bosch valve, then our Kompact valves will be a direct replacement. Alternatively, you can mount one of our 38mm Plumb back valves to your existing piping for increased flow.

Hey buddy, What is the size of these BOV’s 38mm like your other BOV’s or smaller?
Cheers

Bob,

The Kompact valves are smaller and have a 28mm piston.

I have a 2003 Audi RS6 (4.2 Bi-turbo, 450bhp) which BOV would you recomend to replace the standard (Bosch) dump valves.

Kevin,

Our Kompact 25mm Plumb Backs would be a good upgrade.

Hello I have a 2009 Mitsubishi Lancer RAlliart, which of these blow of valves would be best for my set up. The 20mm: TS-0203-1021 or 25mm: TS-0203-1022 or 34mm: TS-0203-1023. Thank you in advance

Jake,

The 34mm TS-0203-1023 will fit your Ralliart Lancer

Hi,

I have a SAAB 93 Aero 2001 205bhp. Current BOV is a Bosch unit.
I would like to replace it with a Kompact Dual Port Universal Fit BOV.

Which size??
20mm: TS-0203-1021, 25mm: TS-0203-1022 or 34mm: TS-0203-1023.

Also what do the different sizes relate to?? Engine power or hose connection?

Thanks

Speed Racer,

You will need the 25mm Dual Port (TS-0203-1022). Different sizes relate to hose connection size.

Hi,

What is the correct part number for a direct bolt on replacement for the Nissan R33 GTST flange?
In the Kompact Plumb back series. Is it this one? TS-0203-1226?

Thanks,

Volt Bite,

The TS-0203-1226 is what you need for the R33 GTS-t.

I Have a 2010 ralliart what do i need to make your product work? is it a direct bolt on?

Landon,

A kompact 34mm Plumb back(TS-0203-1223) or dual port (TS-0203-1023) will be a direct bolt on to your Ralliart Lancer

I got a 2002 VW Mk4 GTi i was wondering what would be my best bet as far as a BOV.

Vw GTI,

Either one of our 25mm Kompact BOVs will suit your car.

I intend to purchase the Universal Dual-Port Kompact BOV for my 1992 Subaru Liberty RS Turbo…

Is the 20mm specification of the TS-0203-1021 the internal dimension of the hose to be fitted to both the inlet and outlet?
How loud is the atmospheric port of these dual-port bovs compared to a supersonic bov??

i have an 09’ mini clubman and was wondering if i would use the 25 mm or 34 mm kompact re-circulating bov..and if it would affect the performance in any way versus the stock bosch diverter valve?
thanks,cornel chow…

Cornel,

a 25mm Kompact will suit just fine. They are stronger and they don’t leak and can handle more boost if you want to modify the engine later.

Cookie,

20mm is the internal dimension of the hose that fits onto the inlet and outlet ports.
In dual port mode, venting will be quieter than in supersonic mode.

I want to use a kompact dual port universal bypass valve on my sons turbo focus it uses a draw thru maf set up in stead of a blow thru maf . is their going to be any issues or should i just use the bypass valve

I have a 96 jap spec Wrx the blow off valve isn’t on the intercooler I went to autobarn they didn’t know wat to do they said it’s a Bosch or sumthing it’s plastic it looks like a upside down T. It’s near the intake right near the turbo they said ask u guys pplease help wat blow can I put and how

Mike,

the Kompact dual port will work fine on your Focus. The dual port comes with a blanking plug to make it a full by pass valve if you want to change it in the future.

Abz,

Your car comes standard with a straight through design 20mm bypass valve. With a few modifications to the rubber piping to the standard BOV, you can mount one of our 20mm Kompact series BOV’s to your car.

What size vacuum line fits the TS-0203-1021?

And i know that two hose clamps are incuded, but can i order additional 20mm and 25mm hose clamps?

Cookie,

5 – 6mm vacuum line will fit the Kompact series.

We do not sell those sized hose clamps separately, We only sell larger sizes.

Hello tech support, Can l use a 25mm Kompact PlumbBack, instead of a Bosch recirculation valve which is slightly open at idle when vacuum is applied, on my Vortech supercharger setup. And is their a way to adjust the piston for a supercharger setup to be slightly open at idle instead of closed to avoid compressor surge. A supercharger builds boost at idle unlike a turbocharger?

Trevor,

Yes you can use a 25mm Kompact plumb back. Plumb backs come in one cap position and are designed to be open at low vacuum.

hi. just got bov dual port installed in my car, lancer RA. some how the sound that it made wasnt the woosh sound that i expected. it sound almost like fluttering, cut of in between. any idea why?

Peter,

check that the vacuum line is not kinked and is not damaged and that there are hose clamps on either end. Check that there is nothing caught in the piston and bore.

Hi. I just Got a Vortech Supercharger for 1997 BMW 740i. I just wanted to know what type of the Kompact DUAL PORT – Universal Fit – NEW FOR 2010 size would fit. And is their any adjustments i have to do to make it run right?

Kwaku,

It depends on what pipe work you have on it. A 25mm would probably suit fairly well but if you want additional flow incase of future upgrades, you might want to look at our 38mm BOV’s. For the Dual port Kompacts, you’ll need to change the spring to our softer supercharger spring however if you get a plumb back, then the spring in it will work for your application.

hey tech I just got my dual port for my vw passat 1.8t and I love it and no CEL but my car is still bouncy at idle and stalls rarely on back offs with the valve adjusted all the way tight, I ordered the pink spring so this should fix that right because the valve will close faster and also do I just unscrew the top to replace the spring? Thanks alot

Nick,

Yes the pink spring should fix that as the valve will close faster. Just unscrew the cap to replace the spring.

Hello tech support i have a small issue that seems to be very common on the konpact DP.After installing a 203-1022 on my sons turbo focus i can not get the piston to close at idle , when i frist started it was open all the way but after adjusting the cap for max spring pressure it is still open about .250 can you provide me with a spring part number . thanks for your help
mike

Mike,

The spring you will need is the pink spring with part number (TS-0203-3002)

Hi, what is the difference between a TS-0203-1023 (34mm kompact dual port bov,$189.00) & the TS-0205-1061 (32mm universal dual port bov $339.00) besides the size of the inlet/outlet diameters. I’m interested in buying one but i’m wondering why the vast difference in price between the two bov. What’s the difference and is there a difference in sound when VTA?

Seamus,

Our Kompact BOVs use a 28mm piston where our Larger dual port BOVs use a 38mm piston which means they flow more air when they open. There is a slight difference in sound but both will give a whoosh sound when VTA.

I own a 09 Ralliart could I possibly use a universal BOV instead of the one for Mitsubishi?

Chris,

You can use any of our 34mm kompact BOVs instead of the larger 38mm Mitsubishi Dual Port.

Hi Techsuport
i fitted a kompact plumb back bpv on my wrx a couple of months ago, and everything was fine,(strong woosh noise). But after i had a larger topmount intercooler fitted it started to make a fluttering noise that sometimes goes away.

Danny,

Did you change anything else like boost or vacuum lines to the BOV or just the intercooler? It sounds like the vacuum signal to the BOV is not very good.

Hi,
I am a proud owner of the 76 celica Ta23 (gt version), my engine setup is a 3tg hybrid with a 2tg head. recently i have installed a sheepdog Bov to my car and the whole engine went haywire…. miss fires… overflow and its hard to crankup….
my mechnics told me its the BOV thtas is giving problem for my airflow system..
Then i was doing some searching for the solution and found out bout turbosmart plumb bov….

Edwin,

You are probably experiencing problems associated with some air flow metered cars and full vent to atmosphere BOV’s. The solution is our Plumb back BOV that will ensure no air is lost in the system keeping your ECU happy.

Hi, I have a 04XT Forester and have purchased a Hyperflow TMIC [ http://www.hyperflow.com.au/index.php?widget=products&section=-top-mount-intercooler-tmic&id=hytm-foxtk ] and I want to get a BOV to go with the install. I would like to get the Kompact [Plumb Back] BOV, can you advise which part number would suit and if any adapters are required?

Paul,

Unfortunately, None of the Kompact BOV’s will fit. We sell an adapter kit to suit our 38mm BOV’s. The part number for the adapter kit is TS-0205-1054. It will allow you to fit either a 38mmm dual port or a 38mm plumb back to your car.