GTM SC installs reviewed

DannyGT · 11-07-2010, 08:59 PM

Quote:

Originally Posted by Buddy Revell

Do you think running an open-air BOV would make it worse?

I performed that test already. Ran it atmospherically and by the time I got back from around the block I put it back...It did get a little more pronounced (worse).

RCZ · 11-07-2010, 10:00 PM

Could it have anything to do with the fact that it recircs to one of the two intakes only?

What I dont get is why you guys think its the BPV when it makes the noise under throttle and the BPV should be closed at that point..

efuseakay · 11-07-2010, 10:35 PM

It makes the noise when you let off the throttle.

weiboy718 · 11-07-2010, 11:31 PM

That's weird, this bypass valve shouldn't make any noise at all.

During idling the bypass valve should be slightly open, throttle should be closed, in between shifts open.

christian370z · 11-07-2010, 11:52 PM

It could be an issue with trying to control that part throttle boost; if the system is trying to regulate part throttle boost by rapidly opening and closing the BPV rather than holding the diaphram partially open could be an issue with how the vacuum from the intake manifold pressure drops to a vacuum and thereby operating the BPV or in unequal pressure between the intake manifold and the intake plumbing.

fstrnldr · 11-08-2010, 12:01 AM

Somebody is pretty smart and on the right track.

kevin8086 · 11-08-2010, 06:17 PM

in for dyno numbers

RCZ · 11-08-2010, 11:49 PM

Quote:

Originally Posted by christian370z

It could be an issue with trying to control that part throttle boost; if the system is trying to regulate part throttle boost by rapidly opening and closing the BPV rather than holding the diaphram partially open could be an issue with how the vacuum from the intake manifold pressure drops to a vacuum and thereby operating the BPV or in unequal pressure between the intake manifold and the intake plumbing.

Control boost? this is a BPV, not a wastegate. Completely different functions and mechanisms that operate with the opposite pressure. Wastegates open when a certain positive pressure is reached and bpv's open with vacuum. BPV's dont regulate anything, they just vent. Wastegates also vent, but they are bleeding air to regulate how much boost is made.

What you are talking about is wastegate flutter with an old/slow boost controller.

christian370z · 11-09-2010, 02:22 AM

Quote:

Originally Posted by RCZ

Control boost? this is a BPV, not a wastegate. Completely different functions and mechanisms that operate with the opposite pressure. Wastegates open when a certain positive pressure is reached and bpv's open with vacuum. BPV's dont regulate anything, they just vent. Wastegates also vent, but they are bleeding air to regulate how much boost is made.

What you are talking about is wastegate flutter with an old/slow boost controller.

I didn't word my post well, I was thinking more about the fact that at part throttle in the mid rpm range, the VVEL is controlling throttle more than the throttle plates. Since a BPV releases pressure after the throttle plate has been closed on a normal FI car as opposed to the throttle body being open and VVEL controlling throttle, could this possibly cause an issue?

It is just an idea, I could just be babbling but this seemed plausible since it happens around 2-3k rpm just where VVEL is working its magic.

CGMobile370Z · 11-09-2010, 07:15 AM

Quote:

Originally Posted by christian370z

I didn't word my post well, I was thinking more about the fact that at part throttle in the mid rpm range, the VVEL is controlling throttle more than the throttle plates. Since a BPV releases pressure after the throttle plate has been closed on a normal FI car as opposed to the throttle body being open and VVEL controlling throttle, could this possibly cause an issue?

It is just an idea, I could just be babbling but this seemed plausible since it happens around 2-3k rpm just where VVEL is working its magic.

The GTM S/C kit for the VQ35HR engine has the flutter problem too.

christian370z · 11-09-2010, 01:38 PM

Ah, that's a different matter then. Disregard my posts, sorry for my ramblings!

Phimosis · 11-09-2010, 07:22 PM

AK,
Hi. I know you posted in other threads requesting people to refrain from personal attacks. Someone tagged this thread with "RCZ fail". Can you help us here to stop the continued personal attacks?

Thanks,

-Phim

shumby · 11-11-2010, 01:57 AM

Quote:

Originally Posted by RCZ

Could it have anything to do with the fact that it recircs to one of the two intakes only?

What I dont get is why you guys think its the BPV when it makes the noise under throttle and the BPV should be closed at that point..

I think this as mine does not make in under load. Not saying others don't but mine does not make in under load.

Buddy Revell · 11-11-2010, 11:49 AM

^However, CGMobile says it's happening with the VQ35HR kit too which only has a single intake I believe.

Z1804 · 11-11-2010, 11:52 AM

Are most of you with the SC running HFCs or LTHs? Pardon my ignorance but I would like to know if the LTHs make a huge difference once you go FI.

11-07-2010, 10:00 PM	#197 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1119	Could it have anything to do with the fact that it recircs to one of the two intakes only? What I dont get is why you guys think its the BPV when it makes the noise under throttle and the BPV should be closed at that point.. Last edited by RCZ; 11-07-2010 at 10:02 PM.

11-07-2010, 11:52 PM	#200 (permalink)
christian370z A True Z Fanatic Join Date: Jul 2010 Location: Newport Beach Posts: 3,900 Drives: 2010 370Z/Saab 900se Rep Power: 432	It could be an issue with trying to control that part throttle boost; if the system is trying to regulate part throttle boost by rapidly opening and closing the BPV rather than holding the diaphram partially open could be an issue with how the vacuum from the intake manifold pressure drops to a vacuum and thereby operating the BPV or in unequal pressure between the intake manifold and the intake plumbing. __________________ -320whp / 259wftlbs- SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob

11-09-2010, 01:38 PM	#206 (permalink)
christian370z A True Z Fanatic Join Date: Jul 2010 Location: Newport Beach Posts: 3,900 Drives: 2010 370Z/Saab 900se Rep Power: 432	Ah, that's a different matter then. Disregard my posts, sorry for my ramblings! __________________ -320whp / 259wftlbs- SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob

11-11-2010, 11:49 AM	#209 (permalink)
Buddy Revell Enthusiast Member Join Date: Mar 2009 Location: So Cal Posts: 303 Drives: 08 Infiniti G37 Rep Power: 16	^However, CGMobile says it's happening with the VQ35HR kit too which only has a single intake I believe. __________________ '08 IP G37S/GTM Supercharger/20" DPE SP-5 Wheels/ARK GRIP Exhaust

11-11-2010, 11:52 AM	#210 (permalink)
Z1804 Premium Member Join Date: May 2010 Location: GA Posts: 784 Drives: 2009 370Z Sport M6 Rep Power: 16	Are most of you with the SC running HFCs or LTHs? Pardon my ignorance but I would like to know if the LTHs make a huge difference once you go FI. __________________ Z1804 ------ Z1804 ------ Z1804 ------ ------ Z1804 ------ Z1804 ------ Z1804 Fairlady Z 2011 Calendar Now on Sale!!!

11-07-2010, 10:35 PM	#198 (permalink)
efuseakay Enthusiast Member Join Date: Mar 2010 Location: The DAYNGA ZONE! Posts: 404 Drives: 2010 G37xS Sedan Rep Power: 15	It makes the noise when you let off the throttle.

11-07-2010, 11:31 PM	#199 (permalink)
weiboy718 Track Member Join Date: May 2010 Location: Bay Area Posts: 923 Drives: Infiniti G37 Rep Power: 16	That's weird, this bypass valve shouldn't make any noise at all. During idling the bypass valve should be slightly open, throttle should be closed, in between shifts open.

11-08-2010, 12:01 AM	#201 (permalink)
fstrnldr Base Member Join Date: Apr 2009 Location: CA Posts: 170 Drives: Canyonero Rep Power: 16	Somebody is pretty smart and on the right track.

11-08-2010, 06:17 PM	#202 (permalink)
kevin8086 Base Member Join Date: Oct 2010 Location: Austin Posts: 228 Drives: 09 370Z Sport Rep Power: 15	in for dyno numbers

11-09-2010, 07:22 PM	#207 (permalink)
Phimosis Enthusiast Member Join Date: May 2009 Location: Oildale, CA Posts: 412 Drives: 2013 911 4S Rep Power: 416	AK, Hi. I know you posted in other threads requesting people to refrain from personal attacks. Someone tagged this thread with "RCZ fail". Can you help us here to stop the continued personal attacks? Thanks, -Phim

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