ZPOST
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   ZPOST > BMW Z4 Technical Talk > Engine, Exhaust, Drivetrain Modifications
  TireRack

SUPPORT ZPOST BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER, THANKS!
Post Reply
 
Thread Tools Search this Thread
      02-17-2015, 03:37 PM   #1
pokeybritches
Colonel
pokeybritches's Avatar
United_States
26
Rep
2,007
Posts

Drives: ESS/G-Power Z4M's, VF Z4 3.0i
Join Date: Sep 2009
Location: Alexandria, VA

iTrader: (11)

Garage List
2006 BMW Z4M  [4.25]
2003 BMW Z4 3.0i  [4.50]
Full Review - Tial QR Recirculating Bypass Valve

Tial QR Recirculating Bypass Valve

This mod is a forced induction only mod. The Bosch bypass valve (henceforth, BPV) that came with the VF supercharger kit functioned fine but was completely silent. After taking delivery of my G-Power Z4M, I began to crave the open dump, blow off valve (BOV) sound that came from extra air being dumped. Even though the G-Power Z4M came with a BPV, it sounds like it has a BOV. I didnít think this was possible. So, I bought the Tial QR BPV to try and recreate that sound.

In the sense of getting the BOV sound, I failed. The Tial QR is just as quiet as the Bosch BPV. This has to do with intake routing more than the bypass itself. The only way to get a BOV sound on a VF kit is to install a BOV.

The Tial QR is a high quality piece.





Itís a work of art that Iím disappointed I canít see when I pop the hood, due to its location. The install itself required some custom work with PVC (painted black in the picture). The Tial QR is meant to be welded into place, but with the VF kit using molded plastic piping, we had to make an adapter to get it to work.



Overall, I donít know if I would do this mod again, just because it didnít accomplish what I wanted out of it (boost venting noise) while requiring some custom work. Great product, wrong application. The quality of the piece impressed me, so I will absolutely buy another Tial product Ė likely a Tial Q (BOV) for my ESS Z4M. www.extremepsi.com has good technical support, and they answered my questions right away, even post-purchase. If I choose to upgrade the VF kit, then this piece would become critical, so it provides some peace of mind that it will hold together if I bump up the boost.
__________________
Appreciate 0
      02-17-2015, 05:20 PM   #2
Beedub
Brigadier General
United Kingdom
63
Rep
4,204
Posts

Drives: 2007 Z4 M roadster vt2-500
Join Date: Sep 2007
Location: UK

iTrader: (0)

please try it on the ESS car id love to hear the less with a BOV... i often think about going for the turbosmart dual purpose unit, thats a bypass and BOV in one ( vents at high pressure, re-circs are medium to low) with a nice adjustable color so no spring changes needed, its a very high quality unit but in recent times I've learned to just be happy with what i have until it needs work and in total honestly, the VT valve sound shite but performs perfectly and is a solid unit. I like the fact that all the air is being pumped back into the system, surely that can only be a good thing on a slow boosting centri setup.
__________________
Pristine Bi-colour Ti /Bsm...z4m roadster Ess vt2-500....Perfection on wheels.
Appreciate 0
      02-17-2015, 07:32 PM   #3
dbarton62
Lieutenant
Canada
9
Rep
496
Posts

Drives: 04ZR 3.0 6 speed VF SC
Join Date: Feb 2013
Location: Kitchener Ontario Canada

iTrader: (0)

Josh,
I can also attest to the quality of the Tial products.
Really impressive but not cheap at all.
Having talked to Mike I believe at ExtremePSI he recommended the
TIAL QRJ BLOWOFF/BYPASS VALVE #27564.
It has screw in inlet and outlet that can be sized or configured to whatever system, Turbo or S/C that you have.I went with 1" nipple on both ends as that was what came on the VF Kit.
Do not know if it sounds any different but the BPV supplied with the VF kit was defective.
I can give feed back in the spring.

It really is a shame it isn't more visible.
Attached Images
 
__________________
04Z4R 3.0 6 speed VF supercharged,Tial BPV,Ceramic coated Bimmerbrakes header, megan motor&trans mounts,42 design catch can, custom intake ducting,3.25 blower pulley,pre and post S/C WMI,CDV delete ,custom strut bar,3.73:1,H&R anti roll bars, adjustable Hotchkis end links.Eibach Pro Kit,Koni Yellows. Carbon dipped interior.
Appreciate 0
      02-18-2015, 03:41 PM   #4
pokeybritches
Colonel
pokeybritches's Avatar
United_States
26
Rep
2,007
Posts

Drives: ESS/G-Power Z4M's, VF Z4 3.0i
Join Date: Sep 2009
Location: Alexandria, VA

iTrader: (11)

Garage List
2006 BMW Z4M  [4.25]
2003 BMW Z4 3.0i  [4.50]
Quote:
Originally Posted by Beedub View Post
please try it on the ESS car id love to hear the less with a BOV... i often think about going for the turbosmart dual purpose unit, thats a bypass and BOV in one ( vents at high pressure, re-circs are medium to low) with a nice adjustable color so no spring changes needed, its a very high quality unit but in recent times I've learned to just be happy with what i have until it needs work and in total honestly, the VT valve sound shite but performs perfectly and is a solid unit. I like the fact that all the air is being pumped back into the system, surely that can only be a good thing on a slow boosting centri setup.
Have you thought about disconnecting the BPV's discharge line, and capping off the connection on the intake side? That might give you an idea of how a BOV would sound.

As for the extra air going into the intake, I don't want it. It's been compressed so it's hot. I might install an IAT gauge just to see how much intake temps are raised with a BPV versus a BOV.
__________________
Appreciate 0
      02-18-2015, 03:43 PM   #5
pokeybritches
Colonel
pokeybritches's Avatar
United_States
26
Rep
2,007
Posts

Drives: ESS/G-Power Z4M's, VF Z4 3.0i
Join Date: Sep 2009
Location: Alexandria, VA

iTrader: (11)

Garage List
2006 BMW Z4M  [4.25]
2003 BMW Z4 3.0i  [4.50]
Quote:
Originally Posted by dbarton62 View Post
Josh,
I can also attest to the quality of the Tial products.
Really impressive but not cheap at all.
Having talked to Mike I believe at ExtremePSI he recommended the
TIAL QRJ BLOWOFF/BYPASS VALVE #27564.
It has screw in inlet and outlet that can be sized or configured to whatever system, Turbo or S/C that you have.I went with 1" nipple on both ends as that was what came on the VF Kit.
Do not know if it sounds any different but the BPV supplied with the VF kit was defective.
I can give feed back in the spring.

It really is a shame it isn't more visible.
Good info as always Dave! I was thinking about going for a red or blue BPV, but I was concerned about it getting scratched up.

If I had known you were having issues with your VF-supplied BPV, I could had sent you my unused one! It's sitting in the garage collecting dust.
__________________
Appreciate 0
      02-18-2015, 05:13 PM   #6
dbarton62
Lieutenant
Canada
9
Rep
496
Posts

Drives: 04ZR 3.0 6 speed VF SC
Join Date: Feb 2013
Location: Kitchener Ontario Canada

iTrader: (0)

Quote:
Originally Posted by pokeybritches View Post
I might install an IAT gauge just to see how much intake temps are raised with a BPV versus a BOV.
^ great idea
I might copy that idea to see how much the WMI drops the IAT's
__________________
04Z4R 3.0 6 speed VF supercharged,Tial BPV,Ceramic coated Bimmerbrakes header, megan motor&trans mounts,42 design catch can, custom intake ducting,3.25 blower pulley,pre and post S/C WMI,CDV delete ,custom strut bar,3.73:1,H&R anti roll bars, adjustable Hotchkis end links.Eibach Pro Kit,Koni Yellows. Carbon dipped interior.
Appreciate 0
      02-18-2015, 06:00 PM   #7
torchmedia
Private
4
Rep
66
Posts

Drives: White Z4MC
Join Date: Jul 2014
Location: Canada

iTrader: (0)

I purchased a VF570 kit this winter and having that nice BOV sound is something I am after as well. My kit isn't installed yet, but I actually just ordered a TiAL for it. I went straight to VF and the sold it to me direct - $300.

Interestingly, it's just the Q model - not the QR.

Hoping it will give the sound we are looking for??


Last edited by torchmedia; 02-18-2015 at 06:22 PM.
Appreciate 0
      02-18-2015, 06:20 PM   #8
torchmedia
Private
4
Rep
66
Posts

Drives: White Z4MC
Join Date: Jul 2014
Location: Canada

iTrader: (0)

I should add - VF said that the tune would be altered to accommodate the TiAL when I get my kit installed.
Appreciate 0
      02-18-2015, 06:26 PM   #9
pokeybritches
Colonel
pokeybritches's Avatar
United_States
26
Rep
2,007
Posts

Drives: ESS/G-Power Z4M's, VF Z4 3.0i
Join Date: Sep 2009
Location: Alexandria, VA

iTrader: (11)

Garage List
2006 BMW Z4M  [4.25]
2003 BMW Z4 3.0i  [4.50]
The M kits are a little different as they utilize a MAFless tune... also known as Alpha-N, where the throttle plate position angle (alpha) and rpm (n) are used to determine load, not the MAF readings. The reason I can't do a BOV with the 3.0i is because all of the air has to be accounted for that's read by the MAF sensor. When boosted air is vented to the atmosphere, the car doesn't know where it went, and it will screw up all kinds of things. With a MAFless tune, it doesn't matter.

The Q is a BOV, the QR is a BPV. I think the R stands for recirculating.
__________________
Appreciate 0
      02-18-2015, 06:54 PM   #10
torchmedia
Private
4
Rep
66
Posts

Drives: White Z4MC
Join Date: Jul 2014
Location: Canada

iTrader: (0)

Ahh, that makes a lot of sense now. Bummer.
Appreciate 0
      02-19-2015, 01:27 AM   #11
mfanatic325
///M-fanatic
mfanatic325's Avatar
Taiwan
55
Rep
3,727
Posts

Drives: '07 Z4MC, '04 325Ci
Join Date: Oct 2007
Location: Cupertino, CA.

iTrader: (20)

Garage List
Here are some vids of my dyno last year with the TiAL Q BOV. Hopefully ya'll can access both links
https://www.facebook.com/video.php?v...56&pnref=story

http://instagram.com/p/oEWdBvhcWr/
__________________
VF570 S/C|TIAL BOV|SetRabCooler|Brembo GT 6/4|TE37s|PSSs|KW V3s|SS Race Mufflers/X-pipe|JVT Headers|AS SSK|VibraTechnic Mounts|Sparco Pro2000/6pt.Harness|MS FloorMounts|SE Custom Harness Bar|Tekarbon Angels|M-Tech Pedals|OE Strut Bar|RE RSMs|8000K D2S|CDV DEL|CF Roof Wrap|MB Grills|UUC TrannyMounts/ClutchStop|V1 Mount|P3C Gauge

Last edited by mfanatic325; 02-19-2015 at 01:45 AM.
Appreciate 0
      02-19-2015, 07:45 AM   #12
Beedub
Brigadier General
United Kingdom
63
Rep
4,204
Posts

Drives: 2007 Z4 M roadster vt2-500
Join Date: Sep 2007
Location: UK

iTrader: (0)

Quote:
Originally Posted by pokeybritches View Post
Have you thought about disconnecting the BPV's discharge line, and capping off the connection on the intake side? That might give you an idea of how a BOV would sound.

As for the extra air going into the intake, I don't want it. It's been compressed so it's hot. I might install an IAT gauge just to see how much intake temps are raised with a BPV versus a BOV.
its been cooled??? the BPV is after the intercooler so its dumping air thats in the intake, so whether its used y the engine or the supercharger whats the issue?? not sure i agree on that point... your dumping cooled air back into the system.
__________________
Pristine Bi-colour Ti /Bsm...z4m roadster Ess vt2-500....Perfection on wheels.
Appreciate 0
      02-19-2015, 09:48 AM   #13
pokeybritches
Colonel
pokeybritches's Avatar
United_States
26
Rep
2,007
Posts

Drives: ESS/G-Power Z4M's, VF Z4 3.0i
Join Date: Sep 2009
Location: Alexandria, VA

iTrader: (11)

Garage List
2006 BMW Z4M  [4.25]
2003 BMW Z4 3.0i  [4.50]
Quote:
Originally Posted by Beedub View Post
its been cooled??? the BPV is after the intercooler so its dumping air thats in the intake, so whether its used y the engine or the supercharger whats the issue?? not sure i agree on that point... your dumping cooled air back into the system.
It's gone through the intercooler, sure, but that doesn't mean it's anywhere near ambient. The most an intercooler could ever cool the air is down to ambient, if it was 100% efficient. The air will get a little cooler by expanding after it's released back into the intake from the BPV discharge, but I really doubt it will be as cool as the fresh air coming in.
__________________
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 03:44 PM.




zpost
zpost
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST