Bosch 110 - Euro tuning shop insists the need for 2

[suprarx7nut]

So upon inspecting my stock Toyota BPV, it is completely shot. I dont know how I was even boosting so well because I can blow straight through it.

Anyways... finding the 110 has proved very difficult. I finally found a porsche dealer (actually a well known local euro tuning shop) that could find it using the porsche part number 993.110.337.50. He insisted I'd need to run two of these and one would definitely not cut it. Now, I have done my research and I know there are at least dozens of people running one up to 15 psi with seemingly no ill effects.

My question: Can anyone back up the belief that one bosch 110 can move enough air to ensure the turbine sees a minimal pressure kick? Is the stock outlet of the intake a larger restriction anyway?

The guy running the shop questioned why I would think one would be ok and I realized it was only because "other people have done it" and I hate being a dumb sheep. So please EDUCATE ME!

He said anything near 3 liters that he deals with uses 2 and that they would never use just one on a 3 liter.

PS... If you dont know, dont chime in with a simple "Mine works fine" because we've all read that 10 times over...

Thanks!

**Edit, oh and perhaps most importantly I am running stock ct-26 and intercooler, eventually planning on very mild ct upgrade and *maybe* upgraded intercooler but power levels will not exceed ~350 rwhp and ~12 psi.

 

[GrimJack]

Well, to be honest the fact that hundreds, if not thousands, of Supra drivers are, in fact, using one is a sign. Hell, *I* have used one, and it worked fine - and I've had surge, so I know what it sounds like. Just not with that valve and a stock turbo.

He may be thinking about modern 3.0L engines, which tend to flow a LOT more air than the Supra did in the 80s.

Try comparing the size of the ports on the stock valve with the bosch unit. Furthermore, notice the size of the ports on the 3000 pipe and intake. Even a single bosch is going to outflow those ports, so the idea of mounting two is overkill.

 

[suprarx7nut]

Well, to be honest the fact that hundreds, if not thousands, of Supra drivers are, in fact, using one is a sign. Hell, *I* have used one, and it worked fine - and I've had surge, so I know what it sounds like. Just not with that valve and a stock turbo.

He may be thinking about modern 3.0L engines, which tend to flow a LOT more air than the Supra did in the 80s.

Try comparing the size of the ports on the stock valve with the bosch unit. Furthermore, notice the size of the ports on the 3000 pipe and intake. Even a single bosch is going to outflow those ports, so the idea of mounting two is overkill.

Thanks for the quick response Grim.

You're right about the power difference. I would bet the 3.0 liter Porsche turbos he deals with move a LOT more air than my stock ct26/7M does.

The port size is another thing I considered as well, I just wasn't sure how well that air moves through the Bosch valves. I was thinking even if the Bosch uses 1" piping, it might be heavily restricted at the actual valve section to move only a small amount of air.

It's very strange now that these valves are upwards of 60 bucks when they used to be ~$35 only a few years back according to all the info I'm reading.

Well Dave, if you say it's good with only one, I guess I may have to just take that and get one. I'd still like to see some flow data on a bosch valve vs a stock valve though...

 

[GrimJack]

It wouldn't be too hard to figure out. You'd need to measure the diameter of the valve (the actual part that moves) and the distance it moves, on each unit.

The calculation from there is the simple surface area of a cylinder:

3.1415 * r ^2 * l

where r = the radius (half the diameter) of the valve
and l = the distance it moves

Then just compare the two surface areas. I'd be willing to bet money that the Porsche unit will be significantly larger. I don't have either one here anymore, or I'd do the measurements and plug 'em into a spreadsheet!

 

[3p141592654]

I bought one 5 years ago for $50, and that was the best price I could find. The $35 ones were the lower quality plastic ones (103) that can't hold as much pressure.

 

[Nick M]

Anyways... finding the 110 has proved very difficult. I finally found a porsche dealer.

Not that it matters now, but did you not use google search under the shopping heading? I bought mine on the internet.

http://www.google.com/products?q=bosch+0+280+142+110+&hl=en&aq=0&oq=bosch+

 

[hvyman]

Drifthttp://store.driftmotion.com/static/i-0280142110.php

 

[shaeff]

Not sure if you purchased one already or not, but try www.rmeuropean.com or www.pelicanparts.com

I use both of them when shopping for parts for my M3. RMEuropean ships faster and usually has slightly lower prices. Anything RM doesn't have, Pelican usually will.

 

[suprarx7nut]

It wouldn't be too hard to figure out. You'd need to measure the diameter of the valve (the actual part that moves) and the distance it moves, on each unit.

The calculation from there is the simple surface area of a cylinder:

3.1415 * r ^2 * l

where r = the radius (half the diameter) of the valve
and l = the distance it moves

Then just compare the two surface areas. I'd be willing to bet money that the Porsche unit will be significantly larger. I don't have either one here anymore, or I'd do the measurements and plug 'em into a spreadsheet!

I may have to do that when I pick up the bosch tomorrow.

I bought one 5 years ago for $50, and that was the best price I could find. The $35 ones were the lower quality plastic ones (103) that can't hold as much pressure.

Ah, I think you're right.

Not that it matters now, but did you not use google search under the shopping heading? I bought mine on the internet.

http://www.google.com/products?q=bosch+0+280+142+110+&hl=en&aq=0&oq=bosch+

Yeah, I found those online, but was hoping to find it locally. All the stuff online I had read led me to believe I could pick it up at any Checker/Kragen/Oreileys/Autozone, but they all were completely clueless.

Drifthttp://store.driftmotion.com/static/i-0280142110.php

If I was getting one online, I'd probably get one from Aaron. He's always been great to deal with.

Not sure if you purchased one already or not, but try www.rmeuropean.com or www.pelicanparts.com

I use both of them when shopping for parts for my M3. RMEuropean ships faster and usually has slightly lower prices. Anything RM doesn't have, Pelican usually will.

Found one with them. They call it a turbo pressure cut-off valve or something close to that. 67 plus shipping though.

The funny thing with this is that I have two turbo Supras. One had a functioning BPV and I don't drive that one too hard. I want to sell it soon and I'd rather not break anything driving the snot out of it. I put that one on my black 90 and I blew that one out in a single day of driving aggresively. Goes to show that 20 year old parts just dont hold up to stiff driving. And I'm completely stock too.

Thanks for all your replies guys! I'll pick up the 110 tomorrow from the tuning shop and it should be ~60. He said 60 over the phone, but I'm expecting to pay more like 70 after tax.