Somebody is pretty smart and on the right track.

in for dyno numbers

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.

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

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

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

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

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

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.

I believe I am the only one running LTHs currently, I believe a few have HFC.

What's the performance difference between the two?

^ good luck getting even a remotely accurate answer.

:inoutroflpuke:

We all have been waiting for the answer to that question
Frank

Looking at posted dynos, it looks like LTH's, which eliminate the cat, tend to make about 2-3% more power from baseline than test pipes.

That translates into 6 - 8 more whp than TP's alone... I could be a bit off, but I think that's about right.

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

Wait, I thought people were losing a bit of power with LTHs on SC'ed Z?

From my understanding people are losing power with the LTHs. If they were gaining power people would not be holding back dyno info. I also remember shumby was losing power and thats why he went back to the stock ones. Maybe I am confused but I am pretty sure of it.
Frank

^^^ yes I was . i went back to stock headers and cats. Will but the LTH's back on when Sam gets it all streight on dreamers car. ( oh and once i get my transmission replaced)

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

Oh, sorry -- that was dumb of me -- was basing that on N/A dynos I have looked at.

That said, I'm surprised that people are losing power with a blower and headers... that doesn't quite make sense.

Even if you are making less boost, given the same S/C output, boost is just a measure of restriction, and better flow generally means more power. Tune issue maybe?

Shumby, any upates one what exactly failed in the trans and why?

^^^ no not yet as it is still on the car. Should be gettign chsnged out this week or next week. then it will be sent to Sam at GTM and we will know more then. I'll keep you all posted but it will be a long time.

No crap! Looks like you're stuck on the rig again haha.

^^^ why are you ignoring me on AIM?

^ cause he don't like broken trannies!

true but it seems he enjoys loading up tune after tune so he can drive his car. I bet that is what he is not online his laptop is yet again in his car with yet another update that is bound to fail.

you talking crap about me captain! yes, all these tunes are still a fail big time! i've had enough and gonna call it quits. time for a full full full custom tune.

now your talking. Stillen should just give up on a canned tune and sell the kit as tuner only

^ that wouldn't be very good for business or for the guys out in California.

That would be called the game of "find the smog inspectors who 'forget' the visual inspection" since a SC'ed Z with cats would still pass the sniffer from what I heard.

or just more out of the nanny state you live in.

Well, I think South Florida should detach from the rest of Florida, they are seriously holding us back. We'll just call ourselves "Miami" and officially join South America, since its still unofficial now.

Yeah, I can see how people could find places that "forget" to do visual inspections. I used to have this problem when I lived in the NE. Nothing a little cash can't fix. I hear the penalties are huge out in Cal. though and that cops can also pull you over and do their own inspections. Sucks. Down here in FL you have to be doing something "wrong" to get pulled over, otherwise they would have to pull over every ferrari on the road.

You are right RC, it can be a major hassle out here which is one of the perks of installing a CARB approved kit; you don't have to deal with the headaches. But, as with many things, there are ways to get around these things and in all honesty I cannot believe some people are able to drive some of the cars on the roads out here without getting harassed by police constantly i.e. super duper hella flush cars yet they do.

You have to love how motorcycles, trucks, and commercial vehicles are practically unregulated though... Nice priorities eh?

Yeah, sadly we probably make up about .1% of car related pollution, yet we get hammered on the most only because we are the most visible. The man is keeping us down...man! And by us, I mean you, California.

you're wrong on that one buddy! i'm in the trucking industries and they're strict as hell on commercial vehicles especially the trucks who drives within the ports. any truck that has an 2002 engine and below must have a retrofit exhaust system otherwise they cannot operate within the port and when 2013 rolls around all them trucks without the particulate filter cannot operate in CA. CHP and CARB is always checking for smoking trucks, they come out to the Port of Oakland and road block us and perform inspection on the spot and i also heard that commercial trucks will soon need to smog it lol.

:iagree:
E.P.A. is outa control.
Here in Indiana we still are free enough to be able to drive WTF we want without regulation.

^^^ you don't drive a truck. You look after fish tanks.

the fish lives inside my truck also hahaha!

so you drive a fish truck? somthing smelly is going on here