16 replies to this topic

[z31jaime]

ok well i have been thinking about doing a BOV vs hd CBV in my last few threads. well i started looking in my box of parts and i found an old BOV from a 1g eclipse i remember i got it to but on my 98 eclipse and ended up selling the car and never used it. its use from a junk yard and i think they crushed (dsm cheap mod) but i see sti's and other cause using this so im guessing for a volvo it would be just a matter of adding the flange on the pipe?

[sacrifice]

i hear of people using 1g eclispe bovs on a bunch of different cars, what makes a volvo different?

[magicaljake]

z31jaime, on 09 November 2009 - 04:19 AM, said:

im guessing for a volvo it would be just a matter of adding the flange on the pipe?

and you need to blank off the stock CBV on the turbo itself...

[z31jaime]

magicaljake, on 09 November 2009 - 05:42 AM, said:

and you need to blank off the stock CBV on the turbo itself...

yea i know thats not hard. i was just wondering about maybe the spring rate being different? you know but ill figure it out. hey its free.

[Dave 54]

You'll need to have a flange welded onto the pipe for it to work. Should work just fine though, reason the 2nd gens upgraded to the 1st gen is cause the 2nd gen housings were made from plastic. And the mod they do is to take a punch and slightly "crush" the top, I ran a Greddy BOV on my DSM, but my friend is still running his stock BOV on his DSM with 20psi and hasn't had to do the crush mod yet.

[dongle]

We seem to be overlooking the fact that w/o plumbing it back in(post maf) the valve will be open under vac and the car will stall.

[Dave 54]

dongle, on 09 November 2009 - 04:51 PM, said:

We seem to be overlooking the fact that w/o plumbing it back in(post maf) the valve will be open under vac and the car will stall.

DSM's are plumbed back in post MAF!!!

[dongle]

Dave 54, on 09 November 2009 - 05:26 PM, said:

DSM's are plumbed back in post MAF!!!

Well, I don't think were modding DSM's. So, the point I'm trying to make is:

It is not as easy as just adding a blanking plate and welding a flange. He will have to either mod the intake tube or fab one with a 25mm inlet to recirc the charge OR... It will vent to atmosphere under vaccuum and the car will stall.

[Dave 54]

dongle, on 09 November 2009 - 06:17 PM, said:

Well, I don't think were modding DSM's. So, the point I'm trying to make is:

It is not as easy as just adding a blanking plate and welding a flange. He will have to either mod the intake tube or fab one with a 25mm inlet to recirc the charge OR... It will vent to atmosphere under vaccuum and the car will stall.

Really, then why did the Forge that I had in which does not recirc. back work fine? Just wondering here.

[mikus]

ok I try to leave this topic alone, because you guys sure seem to love BOV's and it doesn't stall up your car like it does on others with pullthrough MAF's - but:
- post-MAF air is metered, and
- losing air after the MAF and before combustion changes your A/F, thus
- venting BOV to atmosphere after MAF is fail. (pppppsssshhhhtfail)

DSM's and Volvos both require recirculation to maintain an accurate A/F ratio. Just because your car can run with a BOV doesn't mean it's right. You can piss in your master cylinder and your brakes will still stop your car.

Soapbox aside - a 1G DSM BOV will work good as any, and they're well made. Their design allows them to 'push' open though, and this typically happens ±18psi. You can check it with a boost leak test, some do hold out higher than that. The "dodge garage" mod will correct this as well, google it.

[Naughty33W]

i'd recomend an adjustable bov , that way as you mod ur car and tune you can adjust the vent psi accordingly

[TyConn]

mikus, on 09 November 2009 - 09:53 PM, said:

ok I try to leave this topic alone, because you guys sure seem to love BOV's and it doesn't stall up your car like it does on others with pullthrough MAF's - but:
- post-MAF air is metered, and
- losing air after the MAF and before combustion changes your A/F, thus
- venting BOV to atmosphere after MAF is fail. (pppppsssshhhhtfail)

DSM's and Volvos both require recirculation to maintain an accurate A/F ratio. Just because your car can run with a BOV doesn't mean it's right. You can piss in your master cylinder and your brakes will still stop your car.

Soapbox aside - a 1G DSM BOV will work good as any, and they're well made. Their design allows them to 'push' open though, and this typically happens ±18psi. You can check it with a boost leak test, some do hold out higher than that. The "dodge garage" mod will correct this as well, google it.

+1
actually +200 if i could


so true, and it made me lol

[Man_Love]

dongle, on 09 November 2009 - 06:17 PM, said:

Well, I don't think were modding DSM's. So, the point I'm trying to make is:

It is not as easy as just adding a blanking plate and welding a flange. He will have to either mod the intake tube or fab one with a 25mm inlet to recirc the charge OR... It will vent to atmosphere under vaccuum and the car will stall.

I have a ghetto HKS type BOV thats not Recirc on my 855 with 19t and it runs like a champ...I have never stalled my 855

[dongle]

Dave 54, on 09 November 2009 - 09:22 PM, said:

Really, then why did the Forge that I had in which does not recirc. back work fine? Just wondering here.

Do you have the DV004? You probably do as it's the one that everyone around here gets.

The DV004 is a dual piston valve. It has one that clamps shut even under vac to prevent metered/unmetered air from leaking.

The sequential valves are designed the same way. This is why they say "FOR CARS WITH MAF/MAS" in the description.

Fuck it. Vent to atmosphere on a MAF car.

[WayAway]

Im about to do this same thing on my 850r, with a greddy type s. it seems there are arguments back and forth with this stalling subject. i have heard of alot of people running full atmospheric bov on these cars and not have problems. well either way im gonna install it tommorow and see how she goes from there...

[z31jaime]

ok well i just went with my CBV and skipped the entire modding pipes and what not.

[WayAway]

z31jaime, on 13 November 2009 - 02:50 AM, said:

ok well i just went with my CBV and skipped the entire modding pipes and what not.

cutting the pipes isnt too bad. just make correct measurements, and get silicone couplers, and your good to go