HKS SSQV Fluttering, and low boost problems

[LegacyOfPhoenix]

I've been searching around everywhere and can't seem to find an answer to this. Ever since i've gotten my SR swapped in (Professionally from a shop) The BOV has a flutter sound. I always thought it was normal, but i've been searching lately and some people say it might be compressor surge. I've seen videos of cars with surge, but mines doesn't sound quite the same.

Here is a video of what mine sounds like, not my video

http://youtube.com/watch?v=Mkk...lated

Also I have a S14 SR, I recently hooked up a boost gauge and I'm only boosting at 7psi, when stock ball bearing should be 10. There are no leaks either. I had a blow turbo gasket and got them all replaced by a shop. Is it an issue with the wastegate?

I'll continue to search, I'd like to know if this is a problem because I don't want to be killing my turbo. Both SR shops i've been to never mentioned the sound being a problem though.

[LegacyOfPhoenix]

Oops, thought I was posting in the tech forum, move if necessary

[motoman399]

if it sounds like the one in the video your fine. and ya you should check your wastegate

[LegacyOfPhoenix]

Is the only way to change the sound to replace the insert then? I've seen the purple and gold inserts. I'm not a fan of the flutter.

[Thoughtful_One]

If it sounds like what's going on in the Youtube video, you're DEFINITELY surging, no doubt about it.

The BOV the guy is running in that clip is the Godzilla. It was meant to hold tons of boost, and as a result, it doesn't open until higher pressure, which is why you can hear it blow off only when revving higher.

The HKS should be very responsive.

Where is the BOV vacuum line connected too?

Also, Is the BOV second-hand or new? If it's older, the internal components might need to be cleaned. Something may be sticking, preventing it to work properly.

About the pressure the wastegate is opening at. I have an S14 SR as well, and though I don't have a boost gauge, it did have one when diagnosing a problem, and it read 8-9 PSI with full turbo-back exhaust.

If you don't have a free-flowing exhaust, it will read lower.

Post in the SR section.

Also, when you do get it to run right, I have botht he gold and purple inserts that I want to sell. They're brand new in box.

Let me know what you find.

[White Comet]

hmm, ive been wondering about this myself. my ssqv sounds similar sometimes but not as bad. i'll take a video today. it seems like it depends on what boost i let off the gas at and how i let off the gas. how does the sound differ for the different inserts. good luck with the boost problem danny.

ps- did the mafs issue ever get taken care of?

[wackawacka]

Maybe you should get a boost controller...

My HKS also makes a flutter at low boost. Ive heard that from everyone who owns a HKS. Pretty sure its just how it sounds. I hope.

[White Comet]

i thought so too, but im not sure

[adrianfromthecastle]

*moved to SR forum*

umm.. I didn't watch the vid cuz I'm still at work..

but fluttering (compressor surge) on low boost should be ok... are you having compressor surge at full boost as well?

and yeah, like thoughtful_one said.. if you have a divorced elbow and 3" exhausting back... you'll boost higher. You might also want to get a wastegate actuator if you don't already have one. I can't speak too much for the s14 sr, but for the s13sr, its the difference between 7psi and 10psi (oh, with fmic too).

[LegacyOfPhoenix]

Where is the BOV vacuum line connected too?

Also, Is the BOV second-hand or new? If it's older, the internal components might need to be cleaned. Something may be sticking, preventing it to work properly.

About the pressure the wastegate is opening at. I have an S14 SR as well, and though I don't have a boost gauge, it did have one when diagnosing a problem, and it read 8-9 PSI with full turbo-back exhaust.

If you don't have a free-flowing exhaust, it will read lower.

Let me know what you find.

The vacuume line is connected to the intake/throttle body. there are 2 "L's" on the bottom of it, it's connected to one, the other is nippled off.

Also BOV was brand new. I have a 3" HKS Hi-Power exhaust and a JDMSport FMIC, the thing is huge.

how does the sound differ for the different inserts.

ps- did the mafs issue ever get taken care of?

The inserts change the sound of the bov. The gold one is apparently does absolutely nothing, just visual appeal but the purple one is more aggressive, lower frequency sound.

No, the maf issue boggles my mind! I've tried 2 perfectly working s14 sr maf's and the car won't run with it on, it idle's like it doesn't even have a maf hooked up. But the Pulsar Gtir one runs okay, but still a rough idle. But it only occasionaly stalls. I think what happened was the guy that swapped the sr in couldn't find a s14 turbo maf, so he stuck a non turbo s14 maf on and tuned the ecu so it would run semi okay and then just gave it too me. I've tried so many maf's, it's gotta be my ecu or something.

*moved to SR forum*

umm.. I didn't watch the vid cuz I'm still at work..

but fluttering (compressor surge) on low boost should be ok... are you having compressor surge at full boost as well?

and yeah, like thoughtful_one said.. if you have a divorced elbow and 3" exhausting back... you'll boost higher. You might also want to get a wastegate actuator if you don't already have one. I can't speak too much for the s14 sr, but for the s13sr, its the difference between 7psi and 10psi (oh, with fmic too).

Thanks for the move adrian!

I do have a 3" HKS Exhaust. Could it be that the fmic is too big for the low boost it's running?

I took video of mine, but youtube won't let me upload, curses maintenance!

[XxgravegodxX]

Yeah, Ive always thought it was normal for a while, but then I heard about the compressor surge and don't know if it will hurt my turbo...

[Neil]

compressor surge is never good. If you hear that sound at all, it's the turbo, not the valve. That sound is the result of your blow off valve not opening for whatever reason. When you take your foot off the gas, and the BOV doesn't open, all the compressed air in the intercooler pipes has nowhere to go so it forces its way back out the inlet of the turbocharger. That's hard on the bearings and it flexes the blades on the compressor wheel.

Thoughtful, Adrian, maybe i'm not reading you right but not having a free flow exhaust won't make the boost "Read lower". Likewise, a 3" exhaust with divorced outlet pipe won't make you boost higher, either. A nice outlet and free flow exhaust might help the turbo spool up a little Faster, but not any More. Boost is only dependant on turbo rpm, and the only thing that controls how fast the turbo can spin is the wastegate. The way the wastegate actuator works, if it were not working properly, you would almost certainly boost too much as opposed to 3psi less than expected. That said, whatever told you 10psi is stock for an S14sr is most likely false information, unless there is an oem boost controller that you inadvertently bypassed during your swap. Remember, VVT is what gave S14sr's the extra peak hp. unless someone snaked your T28 and installed a T25, but that's unlikely because your intercooler piping wouldnt fit right.
Modified by Neil at 2:28 PM 5/13/2008

[White Comet]

The inserts change the sound of the bov. The gold one is apparently does absolutely nothing, just visual appeal but the purple one is more aggressive, lower frequency sound.

No, the maf issue boggles my mind! I've tried 2 perfectly working s14 sr maf's and the car won't run with it on, it idle's like it doesn't even have a maf hooked up. But the Pulsar Gtir one runs okay, but still a rough idle. But it only occasionaly stalls. I think what happened was the guy that swapped the sr in couldn't find a s14 turbo maf, so he stuck a non turbo s14 maf on and tuned the ecu so it would run semi okay and then just gave it too me. I've tried so many maf's, it's gotta be my ecu or something.

so the gold one does nothing for the sound? thats gay. ive always wondering how the different inserts alter the sound. i might have to search for sound clips then.

teh mafs issue is because you're a fatty. your immense weight is causing the ecu to dump more fuel in to compensate for having to hual your fatness around and the mafs just cant keep up

[Thoughtful_One]

Tha's actually what I thought at first about the boost changing.

A friend of mine checked his boost before and after a free-flowing exhaust and it gave him 3 PSI more. All the while without the boost solenoid device.

^ This is why my reasoning changed.

I wouldn't necessarily suggest a boost controller, but as Neil said, check your wastegate actuator.

[Thoughtful_One]

so the gold one does nothing for the sound? thats gay. ive always wondering how the different inserts alter the sound. i might have to search for sound clips then.

teh mafs issue is because you're a fatty. your immense weight is causing the ecu to dump more fuel in to compensate for having to hual your fatness around and the mafs just cant keep up

The purple one has a lower sound, and the gold looks exactly like the silver. I compared them the other day. It's just the "bling" factor.

If you wnat to get rif of the chirp all together, just run the recirc. fitting but don't recirc. if you really want to vent atmos.

[Neil]

did you get to see the change as well? not to say i've never blown hot air before..

[White Comet]

The purple one has a lower sound, and the gold looks exactly like the silver. I compared them the other day. It's just the "bling" factor.

If you wnat to get rif of the chirp all together, just run the recirc. fitting but don't recirc. if you really want to vent atmos.

nah, im not looking to get rid of any sound, i was just wondering what the dif inserts sounded like

[LegacyOfPhoenix]

Hey, Here is a video of mine I took last night

http://www.youtube.com/watch?v=g32A6oIwY5w

compressor surge is never good. If you hear that sound at all, it's the turbo, not the valve.

It sounds like it's coming from the bov. It doesn't sound like it's coming from the turbo at all.

Also, what should I be looking for on the wastegate? All the vacuum hoses are hooked up correctly and nothing looks out of the ordinary.

Also, if it is compressor surge i'm dealing with. What is causing it (I'm guessing the bov not opening is the cause?) And what can I do to fix it?Could it be the vacuum source is bad?

[White Comet]

Hey, Here is a video of mine I took last night

http://www.youtube.com/watch?v=g32A6oIwY5w

when your driving, and it reaches the max boost (7 psi), and you let off, does it still flutter? cuz mine flutters when i shift and its only at 2 psi or so. now when i let mine actually get higher boost, it sounds totally different

[LegacyOfPhoenix]

I've done some research and it seems that a lot of people have this flutter at low boost. Apperently many the HKS bov's have this sound on low boost cars because the spring is set at a tighter setting from factory.

I might try loosening the screw setting, i've read other places that this hasn't changed much though.

when your driving, and it reaches the max boost (7 psi), and you let off, does it still flutter? cuz mine flutters when i shift and its only at 2 psi or so. now when i let mine actually get higher boost, it sounds totally different

It depends how I let the gas off, but usually it still flutters. The other night I got on it and let off at full boost and it didn't really flutter. But I didn't drop the pedal hard either.

I need to get a boost controller

[White Comet]

yeah, i think your fine. and i dont think urs has a screw to adjust ( i could be wrong though) but yeah everyone with an hks hears the flutter at low boost

[Thoughtful_One]

Thta was definitely surging.

Not sure about you, but when I test drove an SR with the older HKS, it never did that.

Yours does *not* have a screw.

Get a picture of your vacuum source and post it up.

Though I have the stock BOV, I'll show you where mine is set up.

[rustest86]

ok thats for sure surging, but my question is that is everyone that has the surging issue are yall still running the t25? mine stopped surging as soon as i installed my tdo5h-18g which was still at 7psi when first installed. so what im thinking is that the t25 even though it can make the pressure, "psi " it may not flow enough, "cfm", to fully operate the ssqv properly. we all know that 12psi from a t25 and say 12 psi from a t3 60-1 have 2 totaly differenty flow rates.

just a thought though

[LegacyOfPhoenix]

Yeah, After closer inspection the bov is definitely not making that sound. It's coming out of the cold air intake, which is definitely from the turbo. I'm gonna go take a picture of the vacuum source, and post it back in a few.

Also, rustest86 I have the stock t28 because it's an s14 sr. But i'm not sure about the flow differences from the t25.

[LegacyOfPhoenix]

Here is the vacuum source. It's the top one going into the L shaped hard line.


Modified by LegacyOfPhoenix at 11:03 PM 5/16/2008

[LegacyOfPhoenix]

The bov isn't opening when I let off the throttle. It opens when I first start to rev it, and opens very quickly when I let off the throttle, but then closes and then the compressor surge sound happens.

Any ideas on how to fix this?

[Thoughtful_One]

Have you checked if the BOV is damaged?

See if HKS has a FAQ.

[LegacyOfPhoenix]

Okay, I have made some improvements.

I tried a different vacuum source and the bov is opening now There is still mild compressor surge under low boost, I still have a few questions...

The vacuum source is from the FPR now. Originally it the fpr vacuum was T'd intake mani, boostgauge, fpr. I replaced the boost gauge with the bov. BUT I know I shouldn't have the bov come from a T'd source.

Is it okay if I come straight from the fpr, or does it need to get vacuum from the intake right before the throttle body.

Also, where should I get for my boost gauge now?

I'll include a picture for visual reference, because we all know how nico <3's pictures

[LegacyOfPhoenix]

Here is a video of the current status. There is still some compressor surge, but it's vastly different from the last video, you can actually hear the bov!

http://www.youtube.com/watch?v=uG2mWmthkXw

Also I took it for a drive, and there is almost no surge at full boost. The bov stays open for a decent amount of time, but as soon as it closes it surges for a little, any ideas on eliminating surge all together?

[Thoughtful_One]

I have an S14 SR myself, and when I just checked some pictures, I found that that my BOV vacuum line comes from the port farthest to the left under the TB.