HKS not opening at low boost.

[Angry7M]

So I traded my Turbo XS RFL BOV for an HKS SSQV. I got it installed last night, I welded the flange in the same location I had my old Turbo XS bov flange. I used the same vaccum line off of the stock location as the stock BOV. It seems I get some mad compressor surge at the turbo. At full boost it will open, but just a bit, enough to be some what audiable.

And tips? Or where have you guys ran you vaccum source from?

I have 2.5" Hard pipes and a aftermarket Intercooler similiar to the stock one in size.

My other TUrbo XS would open up clean and no fluttering at all.

Any help?

Also the BOV is like 2' 1/2 away from the TB.

 

[Raven97990]

Is this an adjustable SSQV? if so try loosening the adjustment bolt out.

 

[Angry7M]

No, it has no adjustment unfortunetly. Also its the 2 GEN BOV.

 

[hvyman]

check your vacuum source and make sure the line isnt soft and pinching closed.

 

[gofastgeorge]

First, is a real HKS or a clone ?

Second, the SSQV is sensitive to dirt coming in through the vacuum signal line.
That is why HKS supplied them with a small inline filter.
If you, or the person you bought it from used it without the filter, then it most likely has something under the internal check valve.
The check valve is a little silicone rubber thing, that you can only see the retaining tip of it iff you take the back cover off them.

This can be cleaned by flooding the vacuum inlet with WD-40, and blowing low pressure air through it.
Like 40 psi works well.
I have cleared several of these that way, and you will be supprized how much junk gets in there.

If you get it working, by all means put a small in-line filter back on it.

If it's a clone, good luck...........

 

[dumbo]

Join the club...not happy with mine. Search and you'll find many others...

 

[hvyman]

This can be cleaned by flooding the vacuum inlet with WD-40, and blowing low pressure air through it.
Like 40 psi works well.
I have cleared several of these that way, and you will be supprized how much junk gets in there.

you ever tried this on a greddy?

 

[gofastgeorge]

I have been into the GReddys.
They don't have a check valve in them.
If they are not functioning, most likely they have a shot diaphragm.

 

[kotu100]

ima give that wd-40 trick a try soon, mine opens everytime at high boost, but low boost i get a lil bit of compressor surge.

 

[Angry7M]

Well I've seen other members on here using these BOV\s and it seems some of the get no flutter.

I just test drove my car right now. I get a flutter ever at 8 psi. At 10psi I get a little tiny whistle.

Ill try getting a better vaccum source and then if that dosent work, ill clean it up like gofastgeorge said.

And yes, its a genuine HKS BOV.

 

[Angry7M]

The thing that bothers me is that I can hear the compression surge alot.

 

[Angry7M]

First, is a real HKS or a clone ?

Second, the SSQV is sensitive to dirt coming in through the vacuum signal line.
That is why HKS supplied them with a small inline filter.
If you, or the person you bought it from used it without the filter, then it most likely has something under the internal check valve.
The check valve is a little silicone rubber thing, that you can only see the retaining tip of it iff you take the back cover off them.

This can be cleaned by flooding the vacuum inlet with WD-40, and blowing low pressure air through it.
Like 40 psi works well.
I have cleared several of these that way, and you will be supprized how much junk gets in there.

If you get it working, by all means put a small in-line filter back on it.

If it's a clone, good luck...........

Well I just installed it yesterday. So I dont have to take it apart for this procedure ? Ill probably give it a try.

 

[supradjza80]

no flutter or surge here. I am also using the same source for vacuum

 

[Van]

So I traded my Turbo XS RFL BOV for an HKS SSQV. I got it installed last night, I welded the flange in the same location I had my old Turbo XS bov flange. I used the same vaccum line off of the stock location as the stock BOV. It seems I get some mad compressor surge at the turbo. At full boost it will open, but just a bit, enough to be some what audiable.

And tips? Or where have you guys ran you vaccum source from?

I have 2.5" Hard pipes and a aftermarket Intercooler similiar to the stock one in size.

My other TUrbo XS would open up clean and no fluttering at all.

Any help?

Also the BOV is like 2' 1/2 away from the TB.

Redmaro,
I too had a little surge on low boost, on cooler days, until I moved the SSQV over the turbo, in the stock location. Now the issue only appears on cold mornings before the turbo heats the SSQV. Van

 

[toyotanos]

After we got my engine running, I had the same problem, but a little worse- my *knockoff* SSQV didn't open at all! I pulled it apart and checked the check valve, and it was leaking quite badly in both directions. I tried to find a new check valve, but as of yet haven't been able to source one. Cleaning it didn't help, and I really wanted to drive my car so this is what I did:

Disassemble BOV completely
Take the the check valve off and put a capped nut onto the end of the shaft
Drill a small hole in between the middle chamber (B) and the pressure chamber (C)
Reassemble BOV
This allows the BOV to operate, but it stays open at idle. Once I do find a check valve, this is all completely reversible (put a bolt into the drilled hole).

It should be noted that my car is running speed-density so I had no ill affects from this. This may cause poor driveability or set codes on MAF vehicles, unless equipped with a recirculation fitting.

 

[Angry7M]

Well long story short, the BOV works perfectly!

I cleaned it up like Gofastgeorge said, and bam! It works flawlessly! No flutter or compression surge at all!

Thanks Gofastgeorge.

 

[Raven97990]

Get a filter then to keep it from happening again =D

 

[Supr91TT]

I left the stock unit in place when I installed the SSQV, both vented to atmosphere since I'm speed density mode on the MAFT-Pro. No issues from the install date at which time the stock unit did surge a bit at 14psi.