is this possible with our TL....my friend was explaining to me that there are universal kits that could be professionally installed...im not really firmiliar with blow off valve....i know OF IT...i know it has something to do with the WASTE GATE...but i told him putting Universal Engine stuff on ur car is probably the dumbest thing you can do....can someone give me more info?

 

u have a turbo TL???

 

no i know that it MAINLY APPLIES to engines that have TURBO's but he said that there is HP to be found if i used a blow off valve

 

blow off valves release leftover air in a turbo. if this can be applied anywhere else.. clue us in

 

I know you can also use BOV in a supercharger too... not sure how it work, but I'm going to search more on it.

 

wouldn't i be able to apply this to the intake manifold? where the CAI connects to the engine bay

 

forgive me if i sound stupid saying all of this...im fairly new to it...im going to school for mechanical engineering so i can learn, but im trying to get a n head start on things

 

Boosted setups build up pressure, makes sense right? A stock engine won't need to do that. I have a Vortech Mondo Bypass on my blower Formula, it releases pressure during part-throttle driving.

 

so a blow off valve is only effective when there is boost...and the boost causese the forced induction (it is) and there is left over air from the boost and the blow off valve releases this....renduring a blow off valve on a stock engine useless...

what about the WASTE GATE?

 

Boost is made when you flow air through a restriction. The more boost that is present, the more airflow is stacking up and NOT being used. Ideally, you do not want boost, you want cfm and airflow.

You can only pack so much air into a cylinder, there just isn't enough room left to add fuel and compress the mixture. What determines power output of any gasoline engine is how efficiently it burns fuel. Air is a limiting factor in power production. So whenever you add more air, you must always add more fuel to create an air fuel ratio that is safe. A supercharged or turbocharged engine will almost always run a richer A/F ratio than one that is naturally aspirated.

So by using a supercharger or turbocharger, you compress the air before it enters the cylinders. Each type of supercharger is different. An Eaton is a positive displacement supercharger that moves the same amount of airflow on each revolution of the rotors. An Eaton is a hybrid roots blower since the rotors are helical cut and not straight. The Eaton does not compress air very well in it's housing, but rather paddles it from inlet to outlet. The compression of the air charge occurs between the blower and the intake manifold. This is why Eaton superchargers are so efficient at low speeds and low boost levels. Adiabatic efficiency of an Eaton M90 at 4 to 5-psi is 65%.

The Twin Screw supercharger is another positive displacement blower that moves the same amount of airflow on each revolution, however most of the compression of the air charge occurs inside the compressor housing. Mainly between the screws or augers. This means you are compressing the air all the time even when you do not need to. Typically these types of blowers have an internal compression of 1.35 so they are very inefficient at low speeds and low boost levels.

At 4 to 5-psi the Twin Screw blower (Auto Rotor and Lysholm) is around 40% adiabatic efficiency. At 15-psi it's 65%, so twin screws are best used for high boost applications or racing. Eatons are best used for street cars or mild racing applications. It's no wonder why Eatons are the choice for OEM car makers when they decide to supercharge their cars from the factory. GM and Ford have used Eatons for years.

A Vortech or Paxton supercharger is a centrifugal type blower with an internal compression. They work very similar to a turbocharger. Air enters the inlet and is spun through the veins of the imperller. The higher the rpm of the impeller, the more the air is compressed and forced through the outlet. Once the air leaves the supercharger it must travel to the throttle body and intake like the stock naturally aspirated set-up. Boost is created at higher rpms with a centrifugal blower. You must have rpm to create airflow.

With any of these types of superchargers, it is always best to have a BY-PASS valve. With Centrifugals, when you are at WOT, and you release the accelerator, the throttle body closes and you have air trapped between the compressor and the throttle body. Many times, you can blow the intake tube off the throttle body since you now have boost present and nowhere for the air to go.

Eatons now come with internal by-pass valves. Most of the older units had them as well, but they were not part of the compressor. When you are off the throttle, the by-pass valve opens and lets air flow around the blower. There is always parasitic drag on the blower snout since the serpentine or blower drive belt must always turn the pulley. You cannot get around this unless you install a clutch (like Mercedes did). However the drag results in like 1-2 horsepower at cruise speeds depending on the efficiency of the blower. Twin screws will cost you more so they require a by-pass valve if you want to cruise on the highway. Otherwise you'll super heat the air even before you want to use it.

Now a blow-off or Pop-off valve is used for HIGH boost applications. Turbochargers will used blow-off valves since the can create more airflow than most engines can use. Hence you have boost. Once boost reaches critical levels, you can harm some of the parts in the system so manufacturers release unwanted boost into the atmosphere. Some Vortech or Paxton blowers can get into the area that requires a blow-off valve.

So do you need a blow-off valve an any naturally aspirated engine? NO!
Will a blow-off valve add horsepower to a supercharged or turbocharged engine? NO!
Will a blow-off valve add power to a naturally aspirated engine? NO!

I hope this helps,

A-Train

 

thank you so much....

 

Very nice write up Atrain.

So the supercharger that RIPP might produce, will that particular charger require/need a blow off valve?

 

Wastegates are the equivalent to the blowoff valve but for the exhaust side of a turbo. It regulates the about of exhaust directed into the turbo. At the right intake psi, it will open and vent the exhaust gas back into the the downpipe and bypass the turbo.

There is no need for a wastegate in a non-turbo application.

Regarding a BOV, I've seen some companies make these units for aspirated motors just for the effect. I wouldn't recommend them since they will adversely affect your performance.

To get maximum sound for BOV, you need to vent to the air, most pro models will vent the intake air back into the intake line to prevent pressure loss.
So venting an regular aspirated engine to the air could lead to a response drop. Sorta like a minor vaccum leak in a line.