grimreaper;1379220 said:
boostin300;1380228 said:
so if visual inspection fails, hows a good way to test to see if the wastegate is opening and closing?
no boost? Do I have a turbo?[fixed, w/ new problem]
- Thread starter MA70Snowman
- Start date
so if visual inspection fails, hows a good way to test to see if the wastegate is opening and closing?
Test would be to see if your cars getting boost or not.. seems yours isn't.. lol. If you have an open dump tube, you could somehow test how much exhaust comes out of that, maybe if it was on jackstands? There would be a VERY significant amount coming out if it was stuck open at higher rpms
Make sure all the couplings are good, I did read a thread with a guy that had a similar problem, but he still boosted. His EBC was set at 21 pounds but it wouldn't boost past 12.. poor guy spent almost 500 in parts just to find a hole in a silicon coupler big enough to let out a decent portion of boost.
Check every last inch of your piping post-turbo, check for tiny cracks. Tiny cracks open up a lot more when under boost.. make really sure there aren't any. Make sure idle valve is also not stuck open..
If you know you have no air/vac/boost leaks after the turbo, it only makes sense the wastegate is stuck open because if there's exhaust coming out of the motor, which there is, that exhaust has to go somewhere.. if the gate's stuck open 100% for whatever reason you'll lose most of that energy that would normally spool up the turbo.
If it isn't that I wouldn't know what it would be. Could be something else but I wouldn't know what.
Make sure all the couplings are good, I did read a thread with a guy that had a similar problem, but he still boosted. His EBC was set at 21 pounds but it wouldn't boost past 12.. poor guy spent almost 500 in parts just to find a hole in a silicon coupler big enough to let out a decent portion of boost.
Check every last inch of your piping post-turbo, check for tiny cracks. Tiny cracks open up a lot more when under boost.. make really sure there aren't any. Make sure idle valve is also not stuck open..
If you know you have no air/vac/boost leaks after the turbo, it only makes sense the wastegate is stuck open because if there's exhaust coming out of the motor, which there is, that exhaust has to go somewhere.. if the gate's stuck open 100% for whatever reason you'll lose most of that energy that would normally spool up the turbo.
If it isn't that I wouldn't know what it would be. Could be something else but I wouldn't know what.
Can you test a wastegate by using an air compressor maybe ?
otherwise put it on a dyno somewhere and see what your engine does under load?
Just to rule out your boost controller, did you try to run the wastegate just on spring pressure ?
otherwise put it on a dyno somewhere and see what your engine does under load?
Just to rule out your boost controller, did you try to run the wastegate just on spring pressure ?
MA70Snowman;1380514 said:
Well did two things tonight.
1) disconnected the boost controller from the setup
2) checked for leaks: I found one vacuum line leaking that went to the actual control unit of the profec B spec II, so fixed that.
Ran the Car w/o the boost controller and verified no leaks.
Managed to boost to 10 PSI.
however I am noticing something new.. although the BOV is working. I can hear the "Flutter" of back spool, or compressor surge. now thats got me wondering. WHY would the compressor surge, if the BOV is indeed working? its a HKS SSQV that i've been running for approx 3 years now. any thoughts on that one?
so figured out the wastegate problem, now I just need to fine tune the MAFT setup, and figure where this surge is comming from.
Everyone I know personally who has the hks ssqv all get that flutter under lower boost....when they really get on it, it let's out a nice solid sounding purge...I don't think you're hearing surge, I think it's just the valve fluttering in the bov.
Congrats, I hate the fn flutter too....HKS SSQV FTL, seems like a draw, some get lucky some not...
gaboonviper85;1380977 said:
My SSQ is also making a noise that is similar to surge but it sure is the BOV. You really really sure it's the
Anyway, do you have the new type SSQ without the ajustment screw?
If not, ajust (loosen) the screw some.
thevork;1381044 said:
like i've said i've had that SSQ for 3 years and never heard that come from the BOV before. and yes it is the "newer" one w/o the adjustment screw.
Might want to look into the Synapse bov. HKS is good but doesn't let air out as fast as the Synapse.
Your SSQV will flutter from 0psi to around 2psi, anything more it pretty much blows it all off. I learnt this from my 7m setup but perhaps your is differant. Remember to get vacuum from a POST-throttle flapper source. Like off the intake mani, not off the throttle body.
(that was my problem anyways, I had it coming off the throttle body not the intake mani)
(that was my problem anyways, I had it coming off the throttle body not the intake mani)
boostin300;1381241 said:
Thats honestly what I was thinking. That the BOV isn't getting air out fast enough. but i mean. I was pretty sure that was the reason for the SSQV was to release preassure faster. and besides. I'm only at 10 psi at the moment. Less then I was before w/ no compressor surge. So reasoning would tell me that it should be able to get out the same amount of air just as quick. now if i was upwards of 16-22 psi. I'd be more inclined to thing that it was the BOV.
Highlex;1381251 said:
The port its tapped into IS indeed comming off of the manifold. so don't know about that issue. But yes i was aware of the flutter from 0 -2 psi.
I've driven this car w/o a BOV installed before, (was having my new pipes fabbed and welded. and When I would hit 2-3 psi I would get compressor surge. So i know what it sounds like, and this is the EXACT same sound.
I don't want to buy a new BOV unless i need to and i'm pretty sure the SSQV is rated for MUCH higher then 10psi
::EDIT:: now that I think about it. I don't think the issue here is "PSI" but more of a "CFM" related issue. any thoughts/agree/disagree?
you should try running solid lines to your bov and just have short rubber lines between the manifold and hardline and hardline and bov. if you think about it the less flex you have in the bov control hose the quicker it will respond to boost and vacuum. making the line as short as possible helps also. i am running a tial and i had a long silicon hose that would implode before it would open the bov so i got some steel brake line and bent it to fit and now i dont have any surge.
I thought the same thing, before and me and a buddy checked that.
I pulled the line off while he pulled it up to 3000 RPMS. and vacuum was consistant the whole time. I think max vac I pulled was -30. I got some quality thick walled hose from LIPP for ALL of my lines through out the engine.
I pulled the line off while he pulled it up to 3000 RPMS. and vacuum was consistant the whole time. I think max vac I pulled was -30. I got some quality thick walled hose from LIPP for ALL of my lines through out the engine.
jdub;1381697 said:From one of my posts a few months ago
Grim is correct, it's impossible.
He's right, but your gauge can show 30 for various reasons, although it isn't actually 30 in the engine.
As far as the BOV goes OP, SSQVs can go bad. Although it wouldn't make sense since you didn't change anything on it while adjusting your boost. The SSQV has been used for very high horsepower cars and should support yours fine.
Even if your SSQV was in perfect working condition, I would still recommend you get the Synapse as it works great.
This vid is great explaining all this.
http://www.youtube.com/watch?v=MU5Y6d9rh1k&feature=channel_page
jdub;1381697 said:From one of my posts a few months ago
Grim is correct, it's impossible.
lol okay just to get the two science majors off my back. I did indeed put two disclaimers in there. those being.. "I think" and "max". maybe a poor choice of a "max number" however the # wasn't important as was the result of the test. the silicone hose did NOT collapse.
btw thanks for the science lesson.
boostin300;1381720 said:
Btw, that was an AWSOME video. showed the features of the Synapse VERY well. and made me actually understand where the faults were in the SSQV. its a shame it made such a good point, because i really was a fan of my SSQV. now when I do things I usually do them for performance or because it'll benifit the engine one way or another. I don't usually give into the "nice" things or the "pretty/cool" things. however I did LOVE the sound of the SSQV, and that is the ONLY thing i'm turned off about on the synapse. but logic is there. maybe sometime in near future that'll be my upgrade. But i'm really going to try and sort this issue out w/o replacing the BOV (barring that it is not broken) I'll try and get a sound recording of the noise maybe sunday. and post that up. maybe can get some actual diagnostics. who knows. ::crosses fingers:: it might NOT be comp surge.