Best high boost 30+ psi BOVs

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04-11-2013, 10:10 PM
TurboSinceBirth

Best high boost 30+ psi BOVs

I'm curious what everyone likes to run for high boost. I'm betting quite a few are using the Tial BOVs. I have a 50mm but didn't install it because I was wanting to keep recirculating to eliminate rich shifts and a brief rich AFR hang when going to neutral. It never gave me fits but annoyed me for some reason. To run high boost though I may go back to an open atmosphere BOV. This Greddy RS may have worked but I don't trust it. I'm considering trying out the Tial QR.
04-11-2013, 10:11 PM
FeaRpb

I will be running the Tial Q
04-11-2013, 10:13 PM
Chris@Rvengeperformance

you can get the lower part of the Tial QR housing to convert a Tial Q to a Tial QR for $57 :)

TiAL® Blow Off Valve: TiAL® QR 50mm Blow Off Valve Bottom Section
04-11-2013, 10:17 PM
DuTTch

Greddy Type R old skool
04-11-2013, 10:21 PM
TurboSinceBirth

Quote:

Originally Posted by Forest Gump

you can get the lower part of the Tial QR housing to convert a Tial Q to a Tial QR for $57 :)

TiAL® Blow Off Valve: TiAL® QR 50mm Blow Off Valve Bottom Section

I have the older Tial 50mm version not the new Q design so I'm not so sure it would bolt up. If it did I would definitely run it and an adapter from Boomba racing so it would slip right onto the stock rubber tube.

http://www.boombaracing.com/images/bovadapterb.jpg

I'm sure some individuals have tried Synapse, Forge, and APS. I guess I should rephrase it to holding high boost and not surging/fluttering on WOT shifts.
04-12-2013, 10:49 AM
AdamVR4

Quote:

Originally Posted by DuTTch

Greddy Type R old skool

Yep, I've had my Type-R forever too, without any issues.
04-12-2013, 11:34 AM
Chris@Rvengeperformance

Quote:

Originally Posted by TurboSinceBirth

I have the older Tial 50mm version not the new Q design so I'm not so sure it would bolt up. If it did I would definitely run it and an adapter from Boomba racing so it would slip right onto the stock rubber tube.

http://www.boombaracing.com/images/bovadapterb.jpg

I'm sure some individuals have tried Synapse, Forge, and APS. I guess I should rephrase it to holding high boost and not surging/fluttering on WOT shifts.

no, it will not bolt up to the older style.
04-12-2013, 11:39 AM
HilbillyHomeboy

Another vote for the type R. I went through several bov's; the type R is what I ultimately stuck with. Though the Tial is a damn good one, too.

Jeremy
04-12-2013, 12:32 PM
green-lantern

Quote:

Originally Posted by Forest Gump

you can get the lower part of the Tial QR housing to convert a Tial Q to a Tial QR for $57 :)

TiAL® Blow Off Valve: TiAL® QR 50mm Blow Off Valve Bottom Section

Son of a bitch! I looked for days trying to find a place that sold them! I finally just bought the R from Chris and sold the old one. I also couldn't find the reducer so I had to do some rigging/welding.

Welded a lip here

http://i123.photobucket.com/albums/o...n/DSCF8959.jpg

http://i123.photobucket.com/albums/o...n/DSCF8962.jpg
04-12-2013, 12:41 PM
green-lantern

Quote:

Originally Posted by TurboSinceBirth

I'm sure some individuals have tried Synapse, Forge, and APS. I guess I should rephrase it to holding high boost and not surging/fluttering on WOT shifts.

Have you tried a ballance tube?
04-12-2013, 01:00 PM
nodoze

I have a synapse on my talon , love it

Sent from my HTC Hero S using Tapatalk 2
04-12-2013, 02:36 PM
AdamVR4

Quote:

Originally Posted by TurboSinceBirth

I guess I should rephrase it to holding high boost and not surging/fluttering on WOT shifts.

I've never heard anyone complain that their BOV holds 30 psi but it surges on WOT shifts. In fact, that makes zero sense because the throttle never closes during a WOT shift, so there'd be no opportunity for compressor surge. What on earth are you trying to ask? The part-throttle 'heavy breathing' has nothing to do with the type of BOV.
04-12-2013, 02:42 PM
Greg E

Quote:

Originally Posted by AdamVR4

I've never heard anyone complain that their BOV holds 30 psi but it surges on WOT shifts. In fact, that makes zero sense because the throttle never closes during a WOT shift, so there'd be no opportunity for compressor surge. What on earth are you trying to ask? The part-throttle 'heavy breathing' has nothing to do with the type of BOV.

I think he meant lifting to shift during a WOT pull.
04-12-2013, 02:49 PM
HilbillyHomeboy

Can only happen on lifted shifts. I'm with Adam, never heard of anyone having compressor surge in this scenario.

Jeremy
04-12-2013, 02:53 PM
KeithMac

I run a modified twin piston, the small piston has been mounted rigidly to the large one instead of having a weak spring in there, this way boost pressure pressing on the small piston will never overcome the pressure on the large piston at WOT but will dump when needed.

I also have. Blitz that I plan to strip and refurb. Have tried a fair few bovs now..
04-12-2013, 05:29 PM
TurboSinceBirth

Quote:

Originally Posted by green-lantern

Have you tried a ballance tube?

Not with TD04s. I don't have any surging or fluttering at part throttle +/- 0 psi. If I have any WOT I certainly can't hear it over the exhaust.

Quote:

Originally Posted by AdamVR4

I've never heard anyone complain that their BOV holds 30 psi but it surges on WOT shifts. In fact, that makes zero sense because the throttle never closes during a WOT shift, so there'd be no opportunity for compressor surge. What on earth are you trying to ask? The part-throttle 'heavy breathing' has nothing to do with the type of BOV.

I guess I mean stalling the turbo then on WOT shifts when you lift off to go to the next gear. If the BOV can't vent enough volume of air some could still come back against the turbo when the throttle is closing. All of the higher boost Supras, EVOs, STIs, etc all said the same thing about running high boost with some BOVs. It has ruined turbos in the past and many people can hear it audibly causing resistance against the impeller. I only ask because I have a feeling this might have been what caused my turbo shaft to break at 28 psi. I talked to my friend a few days ago that rode with me and he said it was during the 3-4 shift he saw the turbo puff smoke when it let go. I would at least like to eliminate one variable if it was a contributing factor. Somehow it must have either overspun or stalled out a little is my thinking.

Quote:

Originally Posted by Greg E

I think he meant lifting to shift during a WOT pull.

Yes.
04-12-2013, 06:06 PM
AdamVR4

Quote:

Originally Posted by TurboSinceBirth

All of the higher boost Supras, EVOs, STIs, etc all said the same thing about running high boost with some BOVs. It has ruined turbos in the past and many people can hear it audibly causing resistance against the impeller. I only ask because I have a feeling this might have been what caused my turbo shaft to break at 28 psi.

Ah. Looks like the RS is basically the same as the RZ, with a 40mm valve and plenty of bad reviews out there. The type R is 47mm valve with nothing but good reviews. If I were using a smaller BOV, I'd consider using a pair of them to be safe. The RZ is rated @ 'up to' 400 hp, while the R (with stiff spring) is 375+ hp (no upper limit listed).
04-12-2013, 06:12 PM
TurboSinceBirth

Quote:

Originally Posted by AdamVR4

Ah. Looks like the RS is basically the same as the RZ, with a 40mm valve and plenty of bad reviews out there. The type R is 47mm valve with nothing but good reviews. If I were using a smaller BOV, I'd consider using a pair of them to be safe. The RZ is rated @ 'up to' 400 hp, while the R (with stiff spring) is 375+ hp (no upper limit listed).

I knew I needed to switch it out but since it had been working I got too comfortable playing with fire. Sometimes if it isn't broke it doesn't get fixed. Lol.
04-12-2013, 06:37 PM
Blackmount

Tial. Or nothing.