GTM SC installs reviewed

RCZ · 11-08-2010, 10:49 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, 01:22 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, 06:15 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.

shumby · 11-11-2010, 12:57 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.

efuseakay · 11-07-2010, 09:35 PM

It makes the noise when you let off the throttle.

weiboy718 · 11-07-2010, 10:31 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.

fstrnldr · 11-07-2010, 11:01 PM

Somebody is pretty smart and on the right track.

kevin8086 · 11-08-2010, 05:17 PM

in for dyno numbers

christian370z · 11-09-2010, 12:38 PM

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

Phimosis · 11-09-2010, 06:22 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

Buddy Revell · 11-11-2010, 10:49 AM

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

Z1804 · 11-11-2010, 10:52 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.

Q8y_drifter · 11-11-2010, 03:51 PM

Quote:

Originally Posted by Buddy Revell

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

Only on the 350Z HR. G sedan uses dual intakes as well.

CGMobile370Z · 11-12-2010, 07:37 AM

Quote:

Originally Posted by Buddy Revell

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

On the VQ35HR GTM S/C kits the fluttering sound seems alot more noticable on the G35 which has the dual air filter intake setup, the 350Z has the single air filter intake and it sounds like the fluttering is only during shifts.

YouTube - GTM 350Z HR STAGE 1 SUPERCHARGER KIT 500HP-ROTREX C38 GTM SPEC

FINAL PICS :: Produce_7.mp4 video by GTMPOWER - Photobucket

B1nks · 11-14-2010, 11:28 PM

Quote:

Originally Posted by Buddy Revell

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

When you say single intake are you talking about the throttle body intake area? If so the HR has dual throttle bodies.

11-09-2010, 12:38 PM	#9 (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, 10:49 AM	#11 (permalink)
Buddy Revell Enthusiast Member Join Date: Mar 2009 Location: So Cal Posts: 303 Drives: 08 Infiniti G37 Rep Power: 17	^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, 10:52 AM	#12 (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!!!

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11-07-2010, 09:35 PM	#5 (permalink)
efuseakay Enthusiast Member Join Date: Mar 2010 Location: The DAYNGA ZONE! Posts: 404 Drives: 2010 G37xS Sedan Rep Power: 16	It makes the noise when you let off the throttle.

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11-09-2010, 06:22 PM	#10 (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