Member
Went to a blow thru from draw thru MAF so can now vent to atmo.
BOV seems to be open more than I would have thought and it’s annoying, sounds like a Hoover.
At cruising speed 30mph maybe 25% throttle(guess)the valve is open. Do I have too much vacuum?
Engine is M54B30 Vortech SC 14# boost calculated @5500.
Valve is a Tial QRJ 2# spring
Last edited by dbarton62; 06-22-2019 at 09:04 PM.
04R 3l 6 sp VF SC, custom ducting, alphaN, 2.62 pulley, multiport WMI,Severn Tuning(Pokeybritches), Tial BPV,Ceramic header, magnaflow section 1, SS race muffler/y-pipe, megan mounts,42 design catch can, CDV delete ,custom strut bar,3.91 LSD, H&R bars, Hotchkis links.Eibach Pro Kit,Koni Yellows.Megan camber arms. Carbon interior,SSK,UUC lines.CF aero. Poly bushings.
boost pls
install boost guage and find out.
Stay out of trouble.
max vacuum is at idle and the springs should be picked based on that vacuum.
your spring is too light if it opens a cruise.
hook up a pressure gauge and see what you pull at idle then chose the springs.
Member
Thanks Robocop. My vac gauge reads 16inHg at warmed up idle.
Means I need an 8 or 7# spring whereas right now I have a 3# spring.
What other than I need a heavier spring does that tell you about my motor?
Originally Posted by Robocop
max vacuum is at idle and the springs should be picked based on that vacuum.
your spring is too light if it opens a cruise.
hook up a pressure gauge and see what you pull at idle then chose the springs.
04R 3l 6 sp VF SC, custom ducting, alphaN, 2.62 pulley, multiport WMI,Severn Tuning(Pokeybritches), Tial BPV,Ceramic header, magnaflow section 1, SS race muffler/y-pipe, megan mounts,42 design catch can, CDV delete ,custom strut bar,3.91 LSD, H&R bars, Hotchkis links.Eibach Pro Kit,Koni Yellows.Megan camber arms. Carbon interior,SSK,UUC lines.CF aero. Poly bushings.
Stay out of trouble.
nothing really.
the spring is too weak to hold down that small amount of boost you make part throttle.
different tunes and engines will idle at different vacuums.
i like to tune idle to give the strongest vacuum. mine is about -13 inhg
it is important to run the recommended 1/4'' vac hose or there will be lag.
Stay out of trouble.
just wondering when you rev it does the valve slam shut until u let off or does it kinda stay open?
Member
Yes it slams shut.
If I lift just the slightest it flutters.
I have contacted Tial about a heavier spring.
Hose is 1/4"
Edit. Do you mean rev when at a standstilll (not under load)?. If so, yes the valve stays open.
Last edited by dbarton62; 06-26-2019 at 08:37 AM.
04R 3l 6 sp VF SC, custom ducting, alphaN, 2.62 pulley, multiport WMI,Severn Tuning(Pokeybritches), Tial BPV,Ceramic header, magnaflow section 1, SS race muffler/y-pipe, megan mounts,42 design catch can, CDV delete ,custom strut bar,3.91 LSD, H&R bars, Hotchkis links.Eibach Pro Kit,Koni Yellows.Megan camber arms. Carbon interior,SSK,UUC lines.CF aero. Poly bushings.
Member
Just as a conclusion.
I recieved a heavier spring 8# from Tial. Valve still opens during cruising but not as much.
Could go to a heavier spring still but want to be sure I do not get compressor surge on uplift.
04R 3l 6 sp VF SC, custom ducting, alphaN, 2.62 pulley, multiport WMI,Severn Tuning(Pokeybritches), Tial BPV,Ceramic header, magnaflow section 1, SS race muffler/y-pipe, megan mounts,42 design catch can, CDV delete ,custom strut bar,3.91 LSD, H&R bars, Hotchkis links.Eibach Pro Kit,Koni Yellows.Megan camber arms. Carbon interior,SSK,UUC lines.CF aero. Poly bushings.
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