Need a new blow off valve

[t_jolt]

wondering what types of BOV you guys run. I Have a turboxs h34 now, but its leaking at higher boost. Also im recirculating. so a tial will not work for me. I was thinking about a synapses or forge bov. what do you guys think /recommend?

Thanks
Tyrel

[yokotabrat]

A 1g bov with the dodge garage mod works great.

[sbiggi]

Tial has a recirculating BOV cover now.

http://www.extremepsi.com/store/customer/product.php?productid=22182&cat=390&page=1

[Wazzelby]

Tial has a recirculating BOV cover now.

http://www.extremepsi.com/store/customer/product.php?productid=22182&cat=390&page=1

Beat me to it.... You are an internet sniper!

[JSMCPN]

A 1g bov with the dodge garage mod works great.

+1 - I have the Dejon mod with the 15psi switchover. Works great, but MUST be plumbed correctly or it sucks.

[matthewdesigns]

I have a GReddy RS, don't buy one. It can hold a lot of boost, but when tightened down enough to do so it won't open below 6-8psi so it creates surge. And when it's loose enough to release at 1psi it won't hold more than about 20psi before it starts leaking :mad:

I've read a bunch of reviews about the Synapse, and am leaning towards that one. There have been a lot of complaints about it being complicated to get right, but apparently it works well when it's connected properly. It also is reported to leak when at idle and under part throttle, also, and needs positive boost to be fully closed.

Post up what you end up with, cause I'm looking too.

[t_jolt]

well i had a turbo xs, and both of them it seems were made to recirculate. Thats what i plan on doing, so i think im going to give the synapse a try.

[dsm_gsx97]

Synapse is crap like all the other fancy names from what I understand. I'd go with a proven like Tial. Not hard to setup and holds boost like it should unlike the others. I'd say a 1G BOV with the mod is ok, but only for small turbo power levels IMO. That GT30 turbo you have would much rather have the Tial.

[t_jolt]

yeah, im thinking that its between that or the tial. I mean i know the tial will work. But i start to think about how much air the tial does release, i would have to fully re-pressurize the system between every shift. Where as the synapse i think would release just enough, then again when i am racing i never left off the gas in between shifts. So i dont think its going to make that big of a difference. but the tial looks like a giant bong... if i say so myself.

[Overkill]

Your releasing pressure and neither unit is going to release more than it should. The Tial will be able to release a higher volume if ever needed, but it will still do the same job as the smaller one.

[Mirage]

But i start to think about how much air the tial does release, i would have to fully re-pressurize the system between every shift. Where as the synapse i think would release just enough, then again when i am racing i never left off the gas in between shifts. So i dont think its going to make that big of a difference. but the tial looks like a giant bong... if i say so myself.

Keep in mind that is *exactly* what you want. You have the BOV in the system to release pressure and keep the pressure waves from backing up the intake to the turbo causing surge, fluttering and ultimately, damage to the turbo.

Even if you had a 14b, it would probably take less than a fraction of a second to repressurize the intake tract. Especially when it was at full spool when you let off the gas.

I do not have first hand experience with synapse. However to those I've talked to who have used it say that they can't get it to hold a reasonable amount of boost. Most people that I know who tried synapse ended up with a Tial (wastegate or BOV).

I have used both the older Tial and the new Tial Q. I set up each one with a shimmed 7lb spring to allow for smooth and immediate action. If I even blip the throttle at idle, the BOV will open. Yet in this configuration, it holds all the boost I can throw at it.

If you get a Tial BOV in the end, pick up either the 9lb spring (healthy engine, stock cams, high vacuum, etc) or a 7lb spring (cammed, worn engine, low vacuum, etc) and shim it to your particular setup. Do NOT run the 11lb spring. It will NOT open at lower boost levels (<20 psi) smoothly and cause surge.

Tials are a bit of a pain to get set up right out of the box, but IMNSHO, are the best you can get for high flow situations. They look real pretty too.....

Marcus

[D Walker]

The Synapse BOV cannot leak by design- ever, and will "hold all the boost you can throw at it" and then some.

The nice thing about the Synapse is it does its job- it releases boost pressure instantly and its pretty much impossible to have surge issues using one.

"Some" people had trouble setting up Synapse wastegates last year when they were new, but I had no issues at all getting one to hold 30+ psi.

[JackM]

But i start to think about how much air the tial does release, i would have to fully re-pressurize the system between every shift.

My brother and a friend of his experimented with a system that puts pressure on the lower port of a BOV to hold it open while sitting on the converter at the line (automatic). With the BOV open there was no pressure on the compressor and the thing spun up fast, but the trick at that point is to not over spin the unit (you can buy turbo RPM gauges from Garrett). When he took off he flicked a switch to close the BOV to build the pressure, which was instant, and off he went at full boost without having to run the engine up at high RPM or for extended periods at the line.

Without load on the compressor, the turbo stays at RPM and can build boost instantly. A BOV isn't what makes a car lose boost when you shift, it's letting your foot off the gas and stopping the exhaust flow through the turbine that slows it down.

I use the Tial knock-off on my car. I have it so loose that it stays open at idle. When I shift I NEVER get compressor surge of any kind and it never leaks. I would say if you go with a Tial or knock-off you want it as loose as possible. The most common failures I see today with turbochargers is thrust wear from all of these dumb ass BOVs that never open properly. The springs that come with any BOV including the Tial are retarded. They are not even close to being loose enough to prevent damage.

Jack

[JackM]

That GT30 turbo you have would much rather have the Tial.

^^ +1

We have set up many GT30s on Tials and they love them...if the spring is loose. The last 30R car we set up we installed a Tial BOV and cut the spring to the point that it would stay open just a touch under vac at idle. It never misses a beat and works just like it should.

Jack