what are the benefits or advantages of having a blow off or wastegate valves in the piping of the turbo kit?

because GReddy is an awesome company, but their turbo kit does not have blow off valve, and the wastegate valve is internal.

can somebody tell me what could be the risks or advantages?

 

The wastegate is internal because thats the way Mitsubishi turbos are. It wont hurt performance at such a low PSI. Most stock turbo cars come with an internal wastegate. You will be fine running it. No need to mess up a beautiful manifold anyway.

The reason Greddy didnt put a BOV in their package is because they wanted the end user of the kit to be able to customize it however they want. You choose the BOV, Engine Management, and Injectors. Your still saving lots of money with their kit.

 

True... I'm actually going to experiment with a Tial 38mm Wastegate with the Greddy kit as soon as it comes in but we'll see if its worth the trouble. And like Zero said, I don't wanna mess up that beautiful manifold either.

 

i wouldnt touch that manifold either.

 

Internal wastegates aren't that bad for lower boost levels. An electronic boost controller compliments it nicely.

As for BOVs... I've always loved the HKS design, and it works on any car. The recirc option is great so you can truly use that valve on any car. Other than that, Tial is still a top performer.

HKS - http://www.dezod.com/pd_hks_super_se...euniversal.cfm
Tial - http://www.dezod.com/pd_tial_billet.cfm

Use the 11psi spring for the Tial BOV.

If you buy either of those, or any other bov on that site... Use coupon code "joe1" to save $5 off your order. You will still get free shipping on the Tial BOV.

 

I love the HKS design as well. That one is goin on my turbo application

 

Yeah the push-pull design is virtually leak proof. Plus it's a pretty small BOV. Let's not forget the unique sound.

 

what are the risk of driving a turbo with out the BOV?
what are the advatages?

 

From what I understand the BOV is required in a Turbo applications. BOV are atmospheric(diverted into the air) so without that pressure being diverted, boost pressure will spike causing a blown motor. As for advantages, none that I know just depend on what BOV you go with, some are better than others

 

From my understanding, Not having a BOV does not reult in a blown motor, but merely there to help prolong the turbocharger. When the throttle body closes from you taking your foot off the gas, it closes off the airt that it rushing at it. That air has to go somewhere right....Well, the air therefore only can go backwards. Air rushing back to the turbocharger is not good for it. Therefore, the BOV is needed so that the air vents back into the atmosphere instead of the turbo. Or in some cases vents back intake coming off the turbo(recirculated).

 

Without a blow-off valve, the air the turbo is pushing into the intake would hit the closed throttle plate and have nowhere to go. This in effect would put backpressure on the compressor and you will get what is called compressor surge (air flowing back into the compressor housing and slowing the wheel). This is dangerous for the turbo and can lead to broken wheels and bent shafts. In order to get around this, the blow-off gives a place for the excess pressure to be vented.

 

Both you guys nailed it. I don't want to repeat everything for obvious reasons, but this is why you would want a BOV, if not, at least a diverter valve for a turbo system.