GR Yaris Turbosmart BOV dual or plumb back difference?

[Tralien]

First of all, I dont know much about BOVs as the Yaris is my first turbo car.
I read that the plumb back variant can reduce lag as the overboost pressure is not released into the atmosphere.

any experience with this upgrade? and who can explain the difference between the dual port and the plumb back in detail? is it worth the upgrade? its not that expensive, its a 1:1 exchange and can be done easily with small hands

 

[Michael Knight]

First of all, I dont know much about BOVs as the Yaris is my first turbo car.
I read that the plumb back variant can reduce lag as the overboost pressure is not released into the atmosphere.

any experience with this upgrade? and who can explain the difference between the dual port and the plumb back in detail? is it worth the upgrade? its not that expensive, its a 1:1 exchange and can be done easily with small hands

I believe atmospheric ones can confuse car's ECU so I would stick to similar system that OEM uses just to avoid any prbolems. Dual port somewhere in between?

 

[Duke]

Any difference? Yes, a vent-to-atmosphere valve will make people assume you have time travelled from a 1990s Max Power meet-up.

 

[BrianTheSn@il]

Vent to Atmos, is a pain to install, its not like the Impreza days where they were ontop of the engine, this bugger is down one side of the engine.
Lovely loud Hiss on gear change, its back to the 90s !

 

[Tralien]

where does the sound with a stock yaris come from? thought its already vented to atmo, I can hear the sound....so whats stock on this car?

 

[Duke]

It's a recirculating one, but you can hear it a bit if you have a window down, yes.

 

[Tralien]

so if its recirculating, whats the benefit of changing it to the plumb back Turbosmart? if its the same system? Can you expect less lag?

 

[Duke]

Normally the assumption is that a decent aftermarket valve will be better made and resist bypass, be more responsive, flow better etc.

Some are also adjustable in terms of spring tension which can be handy when tuning (don’t know if this is the case with the Turbosmart one).

I think that even if that is the case the gains would be extremely marginal on a stock engine, assuming the standard part isn't faulty.

With more boost, it’s probably a good idea. Normally the oem ones are pretty limited, not heard of anyone say the GR one is good, bad or indifferent though.

 

[Tralien]

there s one comment in the turbosmart ad video on youtube that reports about better response and less lag. but I thought the oem one would be atmospheric, so as there is no change in bov type, improvement must come frome elsewhere

 

[SUMOCAT]

You don't want to put a dual port or vent to atmosphere valve in a car that has a maf sensor. The plumb back valve will do something if you have a worn out and or leaking factory valve, but then a fresh oem valve would work too. Other than that I wouldn't expect it to do anything else except lighten your wallet. I'd change my mind if I saw some evidence but usually they always compare these valves to a worn out, old, leaking oem valves.

 

[Lauren]

there s one comment in the turbosmart ad video on youtube that reports about better response and less lag. but I thought the oem one would be atmospheric, so as there is no change in bov type, improvement must come frome elsewhere

I would not recommend venting unmetered air as it will cause issues with the fuelling. I have tried a car with a turbosmart valve. Not only does it sound awful, like the car has a sneeze every time you change gear, I think it also messes with the fuelling and didn't feel as clean on pick up as my car with the standard recirc valve. You can replace with another recirculating valve that is slightly louder than standard. My feelings, don't bother. Nothing wrong with the stock one and you hear it when changing gear under a medium throttle with the window down.

If you like street cred at Maccies, then definitely go the turbosmart valve.

 

[Onehp]

This is a typical 'I used to replace this on my old car, let's do it on this one too' part.

But unless there is evidence of the stock one failing, you're most likely lightening your wallet best case, or introducing new problems worst case...

 

[Spaceman_GR4]

Flame suit on I fitted the dual port early on with his issues even smashing it round the track. No impairment and when I sold up and refitted the original the car felt strangled but that was all due to the mst intake and gpf back 3 inch system. It worked for me and no issues, my mate has run one for a lot ping more miles and is on syvecs the lot again no issues no draw back

P.s fitting is not for the faint hearted tho I managed it on the drive myself both times

 

[YobboYaris]

I had the Forge Atmospheric BOV and had a whole heap of problems which included me going to them directly. I've had them on my previous car, the Yaris just doesn't like atmospheric. In retrospect, I should've just gone recirc.

 

[Tralien]

Oh, I dont want to put the atmospheric one into my car. If I would use one, than the plumb back......Its not for sound....I like the car as it looks and sounds, I stay with stock exhaust
All mods should be performance related (except the heavy and wide wheels).....so for me the interresting part was the comment that the new turbosmart (plumb back) reduces lag. I thought it would come from not releasing the boost into the air...but as the stock and the plumb back variant are the same system (both plumb back) this improvement could only come from better parts quality? I dont know......reducing lag is a very huge point on my list......I had a light, hard mounted, fully made Honda B18 engine and switched to a Turbo engine now. Biggest change you can make. So this Turbosmart sounds interresting for me......but as you all cant confirm this one user´s comment.....maybe I need to try myself?

 

[Onehp]

What kind of boost are you running @Tralien?
This Turbosmart valve is electronically actuated, it is either open or closed and unless there is a OE leak, I see no possible performance benefit. Reaction times should be very similar, a solenoid valve isn't slow.

There is another brand that on other platforms can give reduced lag. The GFB DV+ is a special diverter valve in that through an additional plunger creates a pressure balance that doesn't immediately release all boost pressure, meaning it takes less time to rebuild it during quick shifts or short lifts of the throttle. But this additional plunger can give its own problems. Don't know if available for our platform.

 

[Spaceman_GR4]

I had the Forge Atmospheric BOV and had a whole heap of problems which included me going to them directly. I've had them on my previous car, the Yaris just doesn't like atmospheric. In retrospect, I should've just gone recirc.

What issues? Who fitted it? Sure it had the o rings fitted properly?

 

[Tralien]

I´m still at stock boost.

 

[Lauren]

I´m still at stock boost.

I cannot see how you'd see any advantage from replacing with another recirculating valve. There is always an element of lag with any turbo setup. It can never have the throttle response of a high revving NA. I'd suggest saving your money and getting used to it.

 

[Michael Knight]

I cannot see how you'd see any advantage from replacing with another recirculating valve. There is always an element of lag with any turbo setup. It can never have the throttle response of a high revving NA. I'd suggest saving your money and getting used to it.

With electrically boosted turbo response can be quite good