Best recirculating BOV for 400+ BHP?
 

HI

I need a new BOV for my 425 bhp hawkeye sti.


The car has a FMIC so can either be a universal fitment one attached via hosing, or a Subaru specific one in which I can buy an adapter plate.

Which is the best recirculating valve to handle the high boost pressure of my car?

Not interested in vent to atmospheres of any kind.

Thanks

the original one works fine but if you want something bling I normally go for a forge one as you can ajust it by changing the springs inside to suit your boost level

Why boost? My standard one was passing at 1.75 bar at 421bhp. I changed to a new hks sqv and it comes with an adaptor to make it a recirculating valve. Have to get the plate seperate though

https://cimg8.ibsrv.net/gimg/www.sco...9583e3a6c5.png

Turbosmart plumbback TS-0205-1215/16, not cheap but worth the money. Totally reliable, I wouldn't be tempted back to standard, they can leak at higher boost level.
Trev

Got a Forge on mine, it handles 400+ well enough for anyone.

Forge on mine, well over 400bhp and a piece of engine jewellery too.

Can you guys send me links to the forge ones you have?


I know the standard ones are good but I want something uprated that I know will handle the uprated boost


Cheers

Thats the same one I have now, how do you turn it into a recirculating valve? I'm boosting at 1.6 bar 425 bhp

I run forge on my track toy. You'll need one of these for yours

https://www.forgemotorsport.co.uk/Pi...duct--795.html

sumo power do the hks adaptor that goes in the end in exchange for the triangle/ round part.

I like the look of these and aren't a bad price. I see they do a FMIPCV valve as an optional extra which would come in very handy.

Buy the FMIPCV at the same time - it takes all the hassle out of messing around with different spring ratings in the recirc valve :thumb:

Oh yes 100%, they offer a substantial discount if you buy the valve and the FMIPC together :D

i have one of these that i no longer use if anyone is interested in purchasing? was brand new then i switched from Top mount to front mount so no longer needed

stick with something decent like a turbosmart or aps

Do you not think the forge recirculating valve is up to the job? Which APS model are you talking about?

Turbosmart or a Tial QR are very high quality valves that work at high bhp outputs.SJ.

Shall check them out, I see on the Tial QR there are different spring pressures available. Which would I need for a 425 bhp output?

Spring is related to the vaccuum your under at idle,

Think 10psi ones safe

i took a punt on one of the China Tial QR's - for £30 delivered. its literally the same bar the brand naming. even when disassembled it had the same diaphram/cylinder assembly.

only thing i found was the hexhead screws where a bit soft so upgraded them with some Tial screws which werent exactly expensive either

and seeing as there aint a lot of engineering behind them i thought it was worth a punt....been on for 6mths now with no issues at all - we even ran it up to 1.7bar at one point

just about visible in this pic

-10/15psi spring rate would be fine.SJ.

the turbosmart spring is adjustable, soft to hard, adjusted by turning the cap. On installation they recommend starting at the softest setting at idle and turning clockwise toward hard until the car idles normally, in effect the softest setting you can get away with. On boost it relies upon equalisation of pressure either side of the piston to keep it in place. The OEM DV relies on a very hard spring to keep it in place when the turbo's at max.
Trev

Interesting. Still tryin to decide, I'd say it was probably between the tial and the turbosmart on now as they are guaranteed to hold boost up to 600 bhp. Tial is significantly cheaper too...

I have used both brands "Tial and Turbosmart that I have mentioned previously and they are quality kits, you won't go wrong with either, and your right about them running fine at high bhp figures as my car is over 600 Horses and my Tial DV works fine.SJ.

where did you get your tial one from?

so are forge recirc ones no good?

Can anyone let me know if the tial or turbosmart ones work if i have 2 different maps? Or would the forge be best for that?

any of the above would work but should be installed before the mapping is done.
Trev

thank you