Compressor Surge Demo

http://www.jt-culture.com Playing with the throttle to create Compressor Surge/Stall. Also known as "Pigeon". Sometimes known as "Wastegate Chatter", but this is an innaccurate description.

Category:

Autos & Vehicles

Tags:

• Compressor
• Surge
• Stall
• Wastegate
• Chatter
• Turbo
• 200SX
• 240SX
• S14
• S14a

[blyndrotor]

The purpose of the BOV. When you change gears, the butterfly in the throttle body snaps shut for a moment. The air coming from the turbo now has no where to go, Bov sits between throttle body and turbo venting the air and keeping the turbo spinning hard on gear changes. Without it the turbo stalls placing huge loads on the thust bearing and you have to spool it back up on boost. Laggy

[s14asr20det]

This is true. This video is just a demo of the exact effect you are describing

[blyndrotor]

Yes, the rb25s have a ceramic turbine wheel,

so running more than 14psi can result in it seperating from the shaft due to over speeding and winding up in the cat. Its basically glued on. You can run more but you're on borrowed time if you do.

[s14asr20det]

Thanks for the confirmation :)

[japdrifters13]

sound lovely mate would my t28 make this noise without the metal turbo elbow??

[s14asr20det]

Yep it certainly will. Either remove the BOV alltogether, or get a BOV with a tight spring (like I have).

[munnsey]

This is just flutter, and unless running very high boost levels it's totally harmless. Truely damaging compressor surge occures during boosting.

[psychedelicknight]

I'm sure it was the cars' fault you couldn't get it to work right. Never go back because you can't solve problems.

[AbhLafiel]

@vyraz .3 would be plenty enough to get that effect. .01 is still enough to make some bovs flutter.

[vyraz]

@odoyle414

hi im new at this, so i kinda have a question.. so say for example, your bov is set for higher pressure because u are able to boost at say, 1.5 bar, so to prevent premature opening of the BOV, its set to open at harder preassure but say when you are boosting at like 0.3 bar, doesnt the compressor surge occur as well?

[4468861989]

lol mine makes the same fucking noise right after is shifts

[Rokomis]

@munnsey Thank you for knowing your stuff. A blow off valve will only change the ON BOOST "surge line."

[eyrieeyrie]

sounds funny, it like has compressor surge then sounds like its got a bov when you change gear.

[Tsukuy0mii]

how to make compressor surge?is good or bad?do bov have a sound like compressor surge?

[loudehhh]

dont know y u got thumbs down. hks does have a great sound and it doesnt blow at really low load. making a little tiny bit of flutter.

[odoyle414]

Yeah kc that's exactly right. It is a bad thing because when the air is forced back through the turbo the compressor fan is forced to slow down dramatically, so when you put your foot on the gas again it takes longer for the turbo to spool again (turbo lag) It also puts unnecessary stress on the turbo.

[sr20det414]

yes thats what happens and yes its bad. if you want it to sound like that recirculate your blow off valve into the intake piping so it goes back into the turbo the RIGHT WAY