Hks ssqv
if you have all the parts and want to use it then do so.
If it causes problems then go back to stock?
i dont see the point of this on going thread............................................ .................................................. ............................................
If it causes problems then go back to stock?
i dont see the point of this on going thread............................................ .................................................. ............................................
Thread Starter
Evolving Member
Joined: Aug 2009
Posts: 395
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From: Australia
The point of this thread is to get feedback from people that have already used these parts on their RA or EVO X.
As I mentioned in my first post, I have heard that the SSQV can potentially cause issues with the TC SST but I have not been able to confirm:
1- Is this true!!!!!
2- Was it setup as recirc or vent to atmo!!!!!
If you can answer either of these 2 questions then please feel free to do so.
As I mentioned in my first post, I have heard that the SSQV can potentially cause issues with the TC SST but I have not been able to confirm:
1- Is this true!!!!!
2- Was it setup as recirc or vent to atmo!!!!!
If you can answer either of these 2 questions then please feel free to do so.
The SSQV I have does self adjust so turbo surge will not be a problem.
So by the sounds of it only a few people on here have actually ever used one of these and not had any problems when doing so, is this correct????
I'm not interested in what other types of BOV and DV are like as I do not already have them but I do already have my HKS one so any more info on this would be appreciated.
As with most stock parts of this nature the standard BPV appears to me to be pretty crappy. In my previous expirience with different brands of turbo cars unless you buy a very high end car the plastic BPV leak. This would probably be the reason the EVO MR's come with metal BPV's instead as they are Mitsubishi's top model.
So by the sounds of it only a few people on here have actually ever used one of these and not had any problems when doing so, is this correct????
I'm not interested in what other types of BOV and DV are like as I do not already have them but I do already have my HKS one so any more info on this would be appreciated.
As with most stock parts of this nature the standard BPV appears to me to be pretty crappy. In my previous expirience with different brands of turbo cars unless you buy a very high end car the plastic BPV leak. This would probably be the reason the EVO MR's come with metal BPV's instead as they are Mitsubishi's top model.
Thread Starter
Evolving Member
Joined: Aug 2009
Posts: 395
Likes: 0
From: Australia
What I do wonder is why the RA's boost tapers off as soon as it hits peak boost? Could this be because of the standard BPV not holding the pressure (seems likely)?
I don't have any proof that the standard BPV leaks in the RA (nor did I say it did). What I stated was with my previous experience the standard plastic BPV's are cheap and do leak.
What I do wonder is why the RA's boost tapers off as soon as it hits peak boost? Could this be because of the standard BPV not holding the pressure (seems likely)?
What I do wonder is why the RA's boost tapers off as soon as it hits peak boost? Could this be because of the standard BPV not holding the pressure (seems likely)?
Thread Starter
Evolving Member
Joined: Aug 2009
Posts: 395
Likes: 0
From: Australia
Are you sure about that amby?????
Usually the turbo's are set well within their boost limit and will hold boost through the majority of the rev range before tapering off at top end revs. From the maps I've seen on the RA, it hits peak boost around 3k but then almost immediately starts to taper off all the way to redline.
Usually the turbo's are set well within their boost limit and will hold boost through the majority of the rev range before tapering off at top end revs. From the maps I've seen on the RA, it hits peak boost around 3k but then almost immediately starts to taper off all the way to redline.
Are you sure about that amby?????
Usually the turbo's are set well within their boost limit and will hold boost through the majority of the rev range before tapering off at top end revs. From the maps I've seen on the RA, it hits peak boost around 3k but then almost immediately starts to taper off all the way to redline.
Usually the turbo's are set well within their boost limit and will hold boost through the majority of the rev range before tapering off at top end revs. From the maps I've seen on the RA, it hits peak boost around 3k but then almost immediately starts to taper off all the way to redline.
Thread Starter
Evolving Member
Joined: Aug 2009
Posts: 395
Likes: 0
From: Australia
It isn't a matter of the turbo being within it's optimal boost range, it's simply a factor of its size. A small turbo will always behave like a small turbo, meaning fast spool but mediocre top end performance. The WRX and STI behave the same way because they also have relatively small turbos.
No, it is just the size of the turbo, nothing more. If it was the BPV, you wouldn't be able to hit 18 PSI at all. Look around at other dynos, when tuned, the car holds boost fine.
I agree, it's mostly the small turbo and conservative tune. Look at some dyno charts from vendors with reflashes here....the boost curve holds max boost for about 1500-2000 rpm.
Edit: let me take that back, I can't seem to find the dyno charts I was looking at. I might have been thinking about the torque curve instead...
Edit: let me take that back, I can't seem to find the dyno charts I was looking at. I might have been thinking about the torque curve instead...
Last edited by velocityhead; Oct 1, 2009 at 09:55 AM.
I don't have any proof that the standard BPV leaks in the RA (nor did I say it did). What I stated was with my previous experience the standard plastic BPV's are cheap and do leak.
What I do wonder is why the RA's boost tapers off as soon as it hits peak boost? Could this be because of the standard BPV not holding the pressure (seems likely)?
What I do wonder is why the RA's boost tapers off as soon as it hits peak boost? Could this be because of the standard BPV not holding the pressure (seems likely)?
Stock duty cycle tables, notice drop in duty cycle by design, this and the OEM restrictor pill is a "factory tuned" system for the desired boost curve.
Boost curves, Stock vs Tuned vs boost pill tuned:
The plastic BOV on the 09 RA is the same plastic bov that was found on the 03-05 Evo 8's. It will start to leak substantially around 23 psi peak and about 21-22 psi up top. It actually *slightly* leaks with anything over 20psi.
Last edited by GST Motorsports; Oct 1, 2009 at 10:54 AM.
Thread Starter
Evolving Member
Joined: Aug 2009
Posts: 395
Likes: 0
From: Australia
Thanks for all the info guys.
It's good to know what the limitations of the standard BPV are. It surprises me a little to hear that they're good to at least 20psi.
By the looks of the graph ^^ I need to get a retune and boost pill upgrade to go with the BPV replacement
Back to my original questions, Can anyone give me feedback (good or bad) relating to a SSQV in a 09+ RA or EVO X????????
It's good to know what the limitations of the standard BPV are. It surprises me a little to hear that they're good to at least 20psi.
By the looks of the graph ^^ I need to get a retune and boost pill upgrade to go with the BPV replacement
Back to my original questions, Can anyone give me feedback (good or bad) relating to a SSQV in a 09+ RA or EVO X????????
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