GTM Stage 1.5 Diverter valve noise

kentmo280z · 01-14-2017, 06:42 AM

Originally Posted by fryzia23 View Post
Kentmo, the turbosmart bpv gets loud when off throttle. There's no real way to quiet it down. It turns heads and can scare the crap out of people! The spring tightness does not really matter, at least did not feel any real difference. I try to keep at medium tightness most of the time. The biggest issue with turbosmart bpv I've had is that the piston inside gets dirty, dry and eventually gets stuck or leaking boost when full throttle. Even once a month cleaning and lubing did not help. So after my last track day and very leaky bpv I decided to try something different. It took me 6 months of waiting to finally receive the synapse diverter valve. I haven't gotten a chance to install it yet. Also haven't been driving the car due to winter so I am not in real rush plus need to cut off and weld on new flange for the synapse diverter valve.

kentmo280z · 01-14-2017, 06:43 AM

I also have the Synapse diverter valve and that one wheezes..lol
I might get creative, fabricate a pipe and plumb the valve back into the intake.
There is definitely room to run some 1.25" or 1.5" silicone /aluminum pipe from the diverter valve to the intake. Weld on a 1.25"/1.5" flange to the intake.
That would quiet things down considerably.
Someone tell me why this should not be done.

kentmo280z · 01-14-2017, 08:57 AM

UPDATE:
I re-installed the spring that comes with the Synapse valve when I purchased it as I had the softer supercharger spring in it as of this post.. The softer spring seemed to work best with the stage 1 kit.

Anyway, I tightened the stiffer spring to about 2/3 the way tight,ran the vacuum hose to B port ONLY( furthest from the outlet) and did not plug the A port. I also have K & N filter # RU-0060 installed on the outlet .

The sound volume has gone way done and I am getting a medium loud fluttering sound when the valve blows off. I can live with this...... Maybe

I can not get the car in boost yet to really see the result as I installed 1000cc injectors . My tune guy sent me a remote fuel map adjustment to the Gamma canned tune , just so I could get the car up and running.

The setups I had before this post were:
1) Synapse diverter valve with S.C. spring. Not stiff enough for the new stage 1.5 setup, would blow off during acceleration.
2) The turbosmart valve which also had the softer spring, and it was loud as hell.

woo · 01-14-2017, 10:15 AM

i run the TIAL...its loud and i love it. i like to run up second gear and let off the gas fast so it blows off right beside a ricer or mustang..gives them whip lash!!!!!!!

i had some flutter but after a quik google search and found if i put a washer under spring it may stop. It worked. but it is loud coming off throttle.

01-14-2017, 10:15 AM	#4 (permalink)
woo Base Member Join Date: Aug 2016 Location: lowcountry,sc Posts: 37 Drives: 16 white sport A7 Rep Power: 10	i run the TIAL...its loud and i love it. i like to run up second gear and let off the gas fast so it blows off right beside a ricer or mustang..gives them whip lash!!!!!!! i had some flutter but after a quik google search and found if i put a washer under spring it may stop. It worked. but it is loud coming off throttle. kentmo280z likes this. __________________ 2016 pearl white sport tech, air2air and stillen supercharger Last edited by woo; 01-14-2017 at 10:19 AM.

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01-14-2017, 06:42 AM	#1 (permalink)
kentmo280z Base Member Join Date: Sep 2014 Location: Akron , Ohio Posts: 199 Drives: '10 370Z Roadster Rep Power: 12	Originally Posted by fryzia23 View Post Kentmo, the turbosmart bpv gets loud when off throttle. There's no real way to quiet it down. It turns heads and can scare the crap out of people! The spring tightness does not really matter, at least did not feel any real difference. I try to keep at medium tightness most of the time. The biggest issue with turbosmart bpv I've had is that the piston inside gets dirty, dry and eventually gets stuck or leaking boost when full throttle. Even once a month cleaning and lubing did not help. So after my last track day and very leaky bpv I decided to try something different. It took me 6 months of waiting to finally receive the synapse diverter valve. I haven't gotten a chance to install it yet. Also haven't been driving the car due to winter so I am not in real rush plus need to cut off and weld on new flange for the synapse diverter valve.

01-14-2017, 06:43 AM	#2 (permalink)
kentmo280z Base Member Join Date: Sep 2014 Location: Akron , Ohio Posts: 199 Drives: '10 370Z Roadster Rep Power: 12	I also have the Synapse diverter valve and that one wheezes..lol I might get creative, fabricate a pipe and plumb the valve back into the intake. There is definitely room to run some 1.25" or 1.5" silicone /aluminum pipe from the diverter valve to the intake. Weld on a 1.25"/1.5" flange to the intake. That would quiet things down considerably. Someone tell me why this should not be done.

01-14-2017, 08:57 AM	#3 (permalink)
kentmo280z Base Member Join Date: Sep 2014 Location: Akron , Ohio Posts: 199 Drives: '10 370Z Roadster Rep Power: 12	UPDATE: I re-installed the spring that comes with the Synapse valve when I purchased it as I had the softer supercharger spring in it as of this post.. The softer spring seemed to work best with the stage 1 kit. Anyway, I tightened the stiffer spring to about 2/3 the way tight,ran the vacuum hose to B port ONLY( furthest from the outlet) and did not plug the A port. I also have K & N filter # RU-0060 installed on the outlet . The sound volume has gone way done and I am getting a medium loud fluttering sound when the valve blows off. I can live with this...... Maybe I can not get the car in boost yet to really see the result as I installed 1000cc injectors . My tune guy sent me a remote fuel map adjustment to the Gamma canned tune , just so I could get the car up and running. The setups I had before this post were: 1) Synapse diverter valve with S.C. spring. Not stiff enough for the new stage 1.5 setup, would blow off during acceleration. 2) The turbosmart valve which also had the softer spring, and it was loud as hell.