Name that sound!!!

[laggin3]

So my car is in the shop but I had a question in the mean time. Is the sound in this clip compressor surge, because this is what my car was doing when it was running. http://www.26liter.us/ it is the video that says 3' Exhaust right at the end when he lets off the gas.

 

[candela]

yes, so were you having problems with a release valve? What mods do you have? Sounds like (if there is a BOV) the BOV is either not hooked up or not hooked up properly (as I didnt hear ANY release, though it could be something very stiff and there was just not enough pressure to open it).

 

[DSMJim]

IF it's sounds like cha cha cha kinda like a flock of birds then it's compressor surge. I couldn't find the video you were talking about. That link goes to about 15 videos, non of with have a title that has anything to do with that your talking aout.

 

[candela]

Ya, no kidding I should have said something about that too Your wording made it difficult for me to find...

http://www.26liter.us/videos/3inchexhausttest.mpeg

 

[laggin3]

JDM VR4 6 Bolt Block
K&N Filter
Big 16G Ported Turbo
2.5 in 2G o2 Housing
Greddy Type S Blow-off Valve
2.5/3 in in Downpipe
3 in Catco Catalytic converter
Ported 2G Manifold
3 in RSR Exhaust
Spearco 24x11x3.5 Intercooler with HKS endtanks
Hard Pipes from Turbo to Intake Manifold
NGK Sparkplugs
Magnacore Wires
Apex'i S-AFC
Greddy EGT Gauge
Autometer 30-0-20 Boost Gauge
Jumptronix Air fuel Gauge
O2 Volt Sensor Meter
Short Shifter
ACT 2600 Clutch w/ street disk

Those are all the mods and I still here my BOV, but AFTER I hear that noise... How do I stop the surge?

 

[candela]

SOften it up a little bit...
Everyone has varying opinions on Greddy Type-S so you may here a lot. However how do you have the vacuum lines routed to the BOV?
And where are those lines coming from?

Basic rule of thumb with BOV's: If its NOT surging at all at very low (<4psi) boost levels than the chances are it will not be holding higher boost pressures (considering its a pull type and its at the same adjustment setting). If its surging a little bit at low boost levels, holds the amount of boost you are shooting for and rarely surges then I wouldn't sweat it. If its surging VERY often even at medium to higher boost levels (anything over about 6psi) then its much to stiff and/or there is a problem with the way your lines are settup or mechanically with the BOV itself.

Mine would surge at anything less than about 5psi (a very little amount), but I was demanding mine hold 20+ psi constantly so I never minded the trade off. Some people may freak out and say how bad compressor surge is (and it does sound bad technically); but quite honestly I have seen settups last a VERY long time with some trick amounts of surging going on (not that this is anything to base off of). Basically I don't think its really much to worry about if you here a little fluttering every now and then with your settup.

 

[laggin3]

MaD TyTe Yo!!! Thanks. I shall surge away then.

 

[DSMJim]

Originally posted by laggin3
MaD TyTe Yo!!! Thanks. I shall surge away then.

Yeah that video is totally compressor surge.. Just as Candela said just ignore it if it surges down low.. Check this out for some more info on adjusting the type-s.

http://www.dsmtuners.com/forums/showthread.php?s=&threadid=96185&highlight=wobbles+guide