Nissan Forums / Infiniti Forums - NICOclub > KA24ET / KA24DET Forum > Watch this vid and tell me if you hear compressor surge. (Printable Version) Click here to print this topic.
Post Title: Watch this vid and tell me if you hear compressor surge. Posted by:jmwenick at 8:21 AM 4/19/2007 Hey, so I've been testing my car out, and I'm not sure if I am getting compressor surge. I called HKS and they said the SSQV flutters at low rpms, but I get that fluttering all the time. Watch the vid, and tell me what you think. Thanks
Post Title: Re: Watch this vid and tell me if you hear compressor surge. (jmwenick) Posted by:wild_maxx at 9:17 AM 4/19/2007
doesn't sounds good.... I can't really hear it over that gay *** music and the fruitcake singing it in the pass. seat.... try another vid without that guy.
Post Title: Re: Watch this vid and tell me if you hear compressor surge. (wild_maxx) Posted by:jmwenick at 10:17 AM 4/19/2007 haha, it wasn't really a vid I wanted to post on here, but I wanted to know for sure if it was surge. I have a dsm BOV coming that I'm going to try out.
Post Title: Posted by:GEO at 11:15 AM 4/19/2007 your A/F is WAY off as well,
Post Title: Re: (GEO) Posted by:jmwenick at 12:07 PM 4/19/2007 Yes, it has been strange, especially that night. When I let off the gas totally, the car reads 12.3, but its just cause the AFR goes off the chart. But anyway, I will be getting a SAFC soon to fine tune. But what about the sound? Is it compressor surge?
Post Title: Re: (jmwenick) Posted by:onepuff at 12:46 PM 4/19/2007 i'd say definitely compressor surge
Post Title: Posted by:GEO at 12:49 PM 4/19/2007 Well it kinda of sounds like the SSQV
Post Title: Posted by:nissanfanatic at 2:04 PM 4/19/2007 Yes, there is some surge. Its probably nothing to worry about. I get that sometimes in the lower RPM as well..
Post Title: Re: (nissanfanatic) Posted by:jmwenick at 3:09 PM 4/19/2007 Yes, but thats all I can hear. There is no crisp sound at all, just the fluttering, and it happens even when I am at 6k RPM's.
Post Title: Re: (jmwenick) Posted by:rn240sx at 5:27 PM 4/19/2007 All i heard was music and someone singing constantly... Next time do a video of racing only so that we can hear it better... Matter of fact i didnt hear any bov at all....!!!
Post Title: Posted by:Edub1 at 5:43 PM 4/19/2007 My DSM sounds exactely the same except in my car you can hear the turbo whine.
Post Title: Posted by:C-Kwik at 11:06 AM 4/20/2007 It's just BOV flutter. Surge occurs within the compressor housing.
If you go back and find a BOV comparison test that Turbo magazine did years go, it shows graphs of the pressure over time for each. The graphs show that every single one had oscillating pressures that diminish with time. This is quite inline with flutter. Some flutter is more audible than others. But flutter in that of itself is not surge. Surge can occur even with BOV if it can't release enough air and/or pressure whether there is flutter from the BOV or not.
Post Title: Re: (C-Kwik) Posted by:WDRacing at 12:52 PM 4/20/2007
GAYEST video ever ward nominee...WOOOT. Singing rap music in a car with another dude while holding a video camera
I want my 2 minutes back...
Post Title: Re: (WDRacing) Posted by:jmwenick at 1:59 PM 4/20/2007
^ Sweet, can you get me a T-shirt for that award? Anyway, I had my friend ravving up the car yesterday, and I couldn't even see the Bov diaphram moving? And I hearsd the flutter throught the intake filter, so it has to be surge doesn't it?
Post Title: Posted by:C-Kwik at 3:23 PM 4/20/2007 Possibly, but HKS SSQV's have essentially 2 valves. Under light loads, only the inner valve opens. It may be a bit hard to see that. Not to mention that light loads would not induce much boost pressure if at all. Likely not enough to cause surge or at most, any significant surge.
That video will show you what compressor surge sounds like.
Post Title: Re: (nissanfanatic) Posted by:WDRacing at 4:49 PM 4/20/2007
Best video I've seen yet explaining comp surge...this is going in the sticky.
Post Title: Posted by:Edub1 at 6:48 AM 4/21/2007 If it's the type that stays open at idle it would make sense that you will hear some flutter any time you return to idle from a decent throttle angle. You are going from 0 to -20psi.
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