ok, let's specify now.. are we talking about turbos or sc's right now?

 

the source of pressure doesn't make a difference, but I was referring to the t/c... the methodology is what I am talking about... the whole point of my post is to state that you could easily build a system that had constant boost over the entire rpm range using a BOV and a s/c... you're recirc valve is nothing more than a renamed BOV with it's vent redirected back to the upstream side of the compressor...

 

i give up. you can call it what you want, but BOV's do not regulate system pressure.

 

Ok tamango....let's look at this really simply.

The "system" is turbo and engine.

A bov vents "pressure" build up from the intake (part of the "system") to the atmosphere (not part of the "system"). This venting of "pressure" is a form of "regulation".

Put the words together.......and.....look at that.........a bov "REGULATES SYSTEM PRESSURE."

KiL

 

you guys are waaaay out there...

a fuse in your car is like a BOV. (except that a BOV lasts more than one cycle lol)

the fuse does not regulate your car's voltage level, correct?

the fuse has nothing to do with what voltage your car ran at. (BOV vs system PSI) however, if a damaging situation were to occur that could fry your electrical system, the fuse would blow first. (BOV WOULD OPEN.) That is the function of a Blow off valve. it's a safety device. like a circuit breaker. it opens to prevent damage to the turbo/throttlebody/engine/etc.

if you want to call ANYTHING in a turbo system a regulator, look at the wastegate. the wastegate is what limits system pressure, by allowing exhaust gas to pass AROUND the turbine, once your set pressure is reached.

 

do you all honestly think that a turbo BOV limits system pressure?

 

Oy vey.

Did you read what I wrote at all?

I DID NOT say the BOV regulates THE AMOUNT OF PRESSURE BEING GENERATED BY THE TURBO!!!!!

IT REGULATES PRESSURE BUILT UP IN THE INTAKE BY VENTING IT TO THE ATMOSPHERE. The intake is part of the 'SYSTEM'. The venting is a form of 'REGULATION'.

You just have set in your mind that "regulating system pressure" means somehow changine what the turbo is doing. I sure as hell didn't claim that. Look at what I actually said............not what you want to believe "regulating system pressure" means.

KiL

 

They are riight you know just let it go. ...


Let's all get back to talking abotu how silly an idea it would be to have a twin turbo 1.5 liter 4 that blows up with 8PSI

 

And to answer your little analogy.........YES, a fuse DOES regulate current through a system. It does not actively manipulate the current, but as soon as the current rating of the fuse is exceeded, the fuse blows, cutting off the flow of current through the system. THIS IS A FORM OF REGULATION.

KiL

 

you are correct, it is a form of regulation. but mgithens seems to think that a bov has something to do with what pressure your system pressure runs at.

 

reg·u·late ( P ) Pronunciation Key (rgy-lt)
tr.v. reg·u·lat·ed, reg·u·lat·ing, reg·u·lates
To control or direct according to rule, principle, or law.
To adjust to a particular specification or requirement: regulate temperature.
To adjust (a mechanism) for accurate and proper functioning.
To put or maintain in order: regulate one's eating habits.

in no way does a fuse adjust your system voltage. it simply blows..

 

Wow, there's a lot of misinformation floating around here..

Lag is usually used to describe the time between when you flatten the gas pedal and when the turbo is making full "boost."

What someone else was talking about before was a problem typically associated with a Centrifigual blower. A centrifigual blower builds boost in a linear fashon relative to boost. You spin the blower slower (hey, that rhymes) at 2000 rpm, thereby making less "boost" and the blower is spinning much faster (sorry, no rhyme this time) and makes more boost in the high RPM ranges.

Someone said, "every super charger has some sort of "lag" which isnt' true. A roots or screw type blower comes almost full on just off idle. Look at the setup on a 2003 and 2004 Mustang Cobra. It makes almost full boost right away through 6000 RPM. The problem there is they build a lot of heat. Efficiency declines rapidly once you over spin it.


A BOV stops pressurized air from slamming back into the impeller when you close the throttle. I think everyone has agreed it's technically regulating air on the outlet side of the blower but not boost pressure. It's just preventing damage.

In most supercharger applications the amount of boost is controlled by the pulley size. If you know the diameter of the pulley, engine speed, blower speed, etc.. you can manage it by not under or over spinning it. They're also typically set up to dump air once the throttle is slammed shut, just like a turbo system's BOV.

More to follow...

A

 

Look at the last definition provided:

To put or maintain in order.

A fuse "maintains in order" by not allowing a system to exceed a set limit. If the fuse was not there, a current spike could cause damage to whatever is in question (a stereo, a tv, etc) thus losing the "order" so to speak (defined in this case by the well being of the stereo, tv, etc). Like I said, there is no active manipulation being acheived by either a fuse or a bov........but the purpose they serve is a form of regulation.

Think of it this way. How do traffic laws regulate traffic? A law can't actively do anything to your car or how you operate it........correct? But laws still serve a regulatory purpose. For instance, a Speed Limit sign says 45 mph. This sign can't force your car to maintain this speed..........but should you exceed it, you then run the risk of being ticketed. Therefore the speed limit sign is regulating traffic speed by signifying a potential penalty for exceeding the posted speed.

But now we're to the point of arguing semantics. You believe whatever you wish about what it means to "regulate".

Back on topic:

Twin turbo xB eh? I say make one turbo work first.

KiL

 

You know what I hate? The misuse of the word "blower" when talking about centrifugals and twin-screws. The term blower came from the roots supercharger, because it isn't an internal compression supercharger. The air as BLOWN into the engine, where it compresses. Compression is done in the cylinders, rather than in the unit. This is why it's called a Blower. I understand that A LOT of companies use this term freely, but it's not true. Centrifugals and Twin Screws are compressors, not blowers.

And yea, I never looked into the Blitz further than its 13hp gain. There were people saying it was a roots s/c (eaton type). Twin screws are better than roots with heat, but both are horrible compared to S/C and T/C.

 

Well,

I finally started my turbo install. Got the intercooler mounted today. Will try to keep you informed of my progress.

 

Can't wait for mine.

 

Are you seriously putting 2 turbos on your engine?

 

If so I want pics now. it'll be soo funny. I bet the lil 1.5 is gonna have a hard time spoolin those turbos. what size 15's? lol.

 

Nah, Went with a single turbo...........

 

I'm glad a few people have the ***** to do the forced induction. I don't right now, so I'm waiting to learn from everyone elses screw ups. Good luck, though.