BOV on Stillen S/C??

TopgunZ

Yes, the stillen kit with my A2A and Tial QRJ will make your car extremely intimidating to anyone in a 2 block radius. Not only will you hear it for just a second getting off throttle but at idle and decell all the time.

Anyone with the Tial, about 90% of my customers, can attest to that.

__________________
ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

ChaseZ

What would be a good, though less audibly intense option to the Tial?

I've picked up one of the new Greddy FV BOV's. It haven't tried it yet.

overtureZ

I think I will start looking for a lightly used stillen kit then! Thank you, and I would LOVE to see a video showing your kit off!

ChaseZ

Just search "supercharger 370z air to air" on YouTube. There are enough to whet your appetite for hours

TopgunZ

The Tial with a hose that runs the air back into the engine bay with a filter on the end. This will reduce the Dragon quite a bit.

What size inlet and exhaust on the FV?

This is why the tial is so great. It flows twice as much as the turbosmart and Bosch which are a tiny 1".

When I had the turbosmart it sounded like it was dying to breath, getting choked out.

I can verify not enough air was escaping at high rpms but that's a whole story.

The vortech race valve was much better and flowed enough air, not as much as qrj, but had an annoying high pitch to it at light throttle.

The hks was just all around lame.

The only other valve I would try is the big red (procharger) or the vortech mondo.

__________________
ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

ChaseZ

40mm in, about 1-5/8"
Output is about the same, it comes with a fitting to vent atmosphere- it can be unscrewed for recirc though. Didn't check but think it's similar size.

It sounds like a pretty cool valve, but remains to be seen yet
GReddy

I hadn't thought of running some tube and essentially a muffler on the Tial. I'd have probably gone that way otherwise.

TopgunZ

Sounds big enough. What spring is in it?

__________________
ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

ChaseZ

It is a dual spring setup with a floating valve between them, so not the same kind we are used to. Supposed to give really good response and idle and low boost. It sounds good in theory, but will see how good it is in practice. I'm being guinea pig lol

MoulaZ

How the hell do you people not constantly attract attention from cops? Down here every time a cop drives by you hold your nuts and pray he doesn't look at you funny because if he's having a shitty day, next thing you know you got an awesome yellow sticker at best, and a red sticker at worst. Next thing you know, you have to take the kit off.

I love TopgunZ's kit, but taken aback when I saw his BPV setup, and the fact it has to remain open until boost. The day I drove my car home after getting the SC, I bought a blanking plate for the BPV the very next day to make it a complete Recirc because the noise was driving me insane & the constant fear from police.

When the time comes, I'm definitely going to be whacking a sizeable pipe off the BPV and running it somewhere quiet with a dense filter on the end.

TopgunZ

Yeah, you can do that with my bpv too. No need to whack anything off.

That is why I send the 1.5 out with the tial. A 1.5 coolant hose routed back into the engine bay with a filter tames the beast.

All bpvs stay open when not in boost.

I couldn't even hear the bosch valve the way stillen has it routed back into the intake boot.

__________________
ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

MoulaZ

I was under the impression all BPV are closed until TB closes, Intake manifold sees vacuum, and causes the BPV to open. In addition the charged air has no where to go and pushes up against piston inside BPV aided by vacuum on the other side to escape.

This is also what is throwing me off about your setup. How does the unit remain open but close when accelerating? Is the piston/spring/diaphragm moving in reverse or something?

I know the whole venting to atmosphere here is a non-issue as in this setup your MAFs are much further down so the air would have escaped before being metered and causing issues.

Chuck33079

That's on a turbo. It's backwards on a sc since it makes positive pressure at idle.

__________________
2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

TopgunZ

The reason they have to is because a SC is tied to the revolutions of the motor so it is basically making boost all the time. When you are at 7000rpm and let off the throttle, and the supercharger is still spinning at 50,000rpms....where do you think that air would go?

Even at idle the supercharger is still spinning and the air it is pushing has to go somewhere. The engine is set to ingest what fuel it is seeing for a good AFR so it cant keep swallowing air.


Every and all centrifugal superchargers are like this.

__________________
ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

MoulaZ

I understand that a SC is constantly flowing air due to being belt driven and subsequently always making the 'bov noise' whenever you let off the throttle.

What I didn't get was the actual operation of the BPV in an SC application. The more I'm thinking about it though, I think I'm starting to get it. Under idle condition you're seeing vacuum in the intake manifold, and if the spring inside the BPV is weaker, it is just enough vacuum to barely keep the BPV open. Under acceleration depending on how much throttle applied the intake manifold would see little vacuum or boost, both of which would overcome the weak spring and close the BPV. Let off the accelerator and intake manifold sees normal vacuum and BPV opens again.

If that's the case, then theres no major difference between Turbo and SC application, aside from adjusting the spring inside a BPV used for SC application to remain slightly open at idle.

TopgunZ

You got it. That is exactly how it works. That is why SC springs are around 1.5psi and turbo are around 9 to 12.

__________________
ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM