September 18, 2006I would like to know how the wastegate functions and how the blow off valve comes into play. Thanks in advance!
Forums : Performance General : Please explain wastegate & blowoff valve (1480 Views)
October 6, 2006yeah so would I lol
I havent put a blow off valve on my turbo but I am told I have a wastegate...sooo Someone I would appreciate your knowledge and advaice
October 6, 2006How turbo's work.
October 8, 2006Thanks mean green! That explains the wastegate question, but not the blowoff valve question. Is it used just for a sound effect? Is that what you hear on all these imports when they switch gears? That pssssst sound?
October 9, 2006the blow off valve just realeses the pressure in the tube that runs from the intercooler/turbo to the intake, but i would personally look into a recirculation valve which just shoots all that built up pressure into the tube. because when the blow off valve releases all the pressure your turbo has to respool to build up all the pressure to compensate for all of the air in that tube that was realesed, causeing turbo lag. just my 2 cents. im not a turbo guru or nothing but just things that ive picked up along the way
hope that helps
October 10, 2006I thought we have a blow-off valve (stock) - you can hear "That pssssst sound" on mine since I put in the K&N FIPK intake.
After market blow-off valves are adjustable so you can hold more boost.
October 10, 2006On the stock PT turbo you have what is called a surge valve. It recirculates the compressed air back into the intake. You can add a blow off valve to your uppercharge pipe which releases this pressure into the atmosphere. If not for the surge valve or blow off valve releasing pressure the turbo would be damaged big time.
October 10, 2006Thanks, Mean.
I did a Google search and found this:
The by-pass valve, blow-off valve, anti-surge valve are all intended for the same purpose; that of suppressing a funny and obnoxious chirping noise made by turbos when lifting off the throttle. The noise is technically called â€śsurge.â€ť The â€śblow-offâ€ť valve has slowly acquired the implication that it vents to the atmosphere, while the other two names have leaned toward implying the air is vented back into the system in front of the turbo. The difference is that the blow-off replaces the real surge noise with an equally obnoxious whooshing blast noise made when the vented air hits the atmosphere. The â€śanti-surgeâ€ť valve, with the air ducted back into the system is almost completely quiet, and when heard, amounts to only a gentle â€śsigh.â€ť This is the reason our systems feature the anti-surge valve. It is distinctly more civilized."
October 10, 2006That is the answer I was looking for! Thanks all!
October 10, 2006Interesting, but actually, if there was no surge valve, blow off valve the pressure would not be released and the pressure would try to spin the turbo wheel the wrong way and the turbo wouldn't last very long. The surge valve was put on the PT turbo for the same reason Chrysler put three silencers in the airbox and turbo up pipe. Because they thought older folks were mostly going to buy the PT turbo they wanted a more quiet, civilized sound. Shows you what DCX knows. Lots of younger 30-40 somethings are buying the car and remove those silencers first thing and go for a bov. Now the SRT-4 with the same engine as the PT turbo has no silencers and the surge valve is louder because they were selling to a younger crowd.