Recirculating valve

[exfuzzyt5]

Been trawling through the threads on dump valves/recirculating valves too see if theres any advantage in changing the existing recirculating valve to an external recirculating valve as I've got one spare

Would there be any benefit ?

Its a 2001 V70 p2 -I note threads about the ME7 and not fitting atmospheric valves - but as this is a recirculating valve should I bother or is the standard one fine?

Thanks in advance

Mark

[cameron]

Volvo wouldnt have put it on the car if it wasnt any good ;)

Dont see any point in changing it.

Cheers

[Alan M]

The standard CBV is rated to around 18ish psi IIRC and the external types are rated much higher and work more effectively. You will need to blank off the old one when fitting the new then fit a T piece after your MAF to dump the air back into the system.

[thebadger]

Been trawling through the threads on dump valves/recirculating valves too see if theres any advantage in changing the existing recirculating valve to an external recirculating valve as I've got one spare

Would there be any benefit ?

Its a 2001 V70 p2 -I note threads about the ME7 and not fitting atmospheric valves - but as this is a recirculating valve should I bother or is the standard one fine?

Thanks in advance

Mark


http://www.vpcuk.org/forums/showthread.php?t=17532

ok that's my very long & boring post on P2 valve fitting.

Plate will run you £30 off forge, or make your own! Many have, I did not!

You will need a 3" HOSE T peice, as it's a pipe & not a hose you'll be fitting it to! Nicenewcar on ebay do them at about £10.

I could not get the pipe to keep it's shape so instead I fitted a 45deg silicon elbow on to the 45deg elbow on the pipe! This meant the pipe had no chance to shift!

Then I fitted a 3" straight coupler & then my T to the last bit of pipe (which fastens to the lower intercooler) so messy & hard, but.... good.

No error codes (assuming you don't leave a pipe off) or warnings got thrown by my engine, also the blanking plate makes the whole thing much louder!

Remember that the BOV MUST be a TWIN PISTON version, or you will stall every 2 seconds!

remove the air box/sheild or whatever you run first & tie the MAF to the bonnet hinge with a bit of string! I poped my master break servo line by keeping pushing the maf out my way!

Driving without breaks is silly at best!

Use my pics as a reference on what to do.

CUT NOTHING TILL YOU ARE SURE! More pipe = less problems!

HTH

[thebadger]

p.s. the fitting kit was wrong! buy a silicon T!

[exfuzzyt5]

The standard CBV is rated to around 18ish psi IIRC and the external types are rated much higher and work more effectively. You will need to blank off the old one when fitting the new then fit a T piece after your MAF to dump the air back into the system.


Alan - what effect will the higher psi on the external valve do to performance - will this spool the turbo quicker?

Cheers guys for the advice so far - been away on business last week

Not really decided eitherway

[tomtyres]

Alan - what effect will the higher psi on the external valve do to performance - will this spool the turbo quicker?

Cheers guys for the advice so far - been away on business last week

Not really decided eitherway

?
The higher psi is not created by the external valve, the "18psi" that the original bov is rated at can be upped to around 25-30psi if using a good quality external dump valve (hks, bailey ect..) but 18psi is well enough on a standard engine/turbo setup.
You up the boost pressure by either a remap, adjusting the actuator or a MBC valve on your actuator pipe.

[sebturbo2000]

how about one of these http://http://www.forgemotorsport.co.uk/content.asp?inc=product&cat=&product=FMDVSPLTR (http://www.forgemotorsport.co.uk/content.asp?inc=product&cat=&product=FMDVSPLTR)

[kevin 850t]

Twin Trumpet Dump Valve (Blow off Valve) LOUDEST

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=120342611610&ssPageName=ADME:X:RTQ:GB:1123

If you have an airflow sensor and use this type of dump valve (vent to atmosphere) you may experience some overfuelling, (this i expect will damage the engine ?), can i collect the air, or add air after the maff to prevent this?, thankyou.

[shrek]

i have a forge blanking plate if anyone needs one. New in bag, change of plans mean its not needed. £25 posted (uk mainland only)

http://i2.photobucket.com/albums/y44/FCOC/E%20BAY/DSCF3477.jpg

[Alan M]

Alan - what effect will the higher psi on the external valve do to performance - will this spool the turbo quicker?

Cheers guys for the advice so far - been away on business last week

Not really decided eitherway

What I meant was that the standard valve passes at around 18-20 psi but an external type recirculating valve can work up to high boost pressures of around 50-60psi so they are less likely to pass/leak.

[PaulZX]

So correct me if this is wrong, but are you as well NOT having a BOV if your boost is below 18 psi, but better off having one if you're going above that level?