Compressor surge with Tial?
Oct 19, 2011, 06:59 PM
#1
Evolving Member
Thread Starter
iTrader: (2)
Join Date: Sep 2009
Location: North Carolina
Posts: 192
Likes: 0
Received 0 Likes
on
0 Posts
Compressor surge with Tial?
I just bought evo number 3 and under half throttle or so im getting compressor surge. Im also getting it when boosting 4-10 psi. Im spiking about 27psi then tapering down to about 22. Any help would be greatly appreciated 
Oct 20, 2011, 09:55 AM
#7
Evolving Member
iTrader: (2)
Join Date: Jan 2006
Location: Ogden UT
Posts: 106
Likes: 0
Received 0 Likes
on
0 Posts
it means that its your setup as n2oiroc said.
i would still check your vacuum at idle when at operating temp and check the spring on tial's website just to rule that out.
just my .02
i would still check your vacuum at idle when at operating temp and check the spring on tial's website just to rule that out.
just my .02
Trending Topics
Oct 20, 2011, 09:59 AM
#8
Evolving Member
iTrader: (2)
Join Date: Jan 2006
Location: Ogden UT
Posts: 106
Likes: 0
Received 0 Likes
on
0 Posts
do you have a dedicated vac line to the bov? or does it supply other things also? sometimes that can mess with the proper operation of the bov if im not mistaken
Oct 20, 2011, 01:21 PM
#10
If you are getting surge at half, full or any other throttle position than closed, its not the bov assuming its plumbed correctly which it sounds like its not. Generally compressor surge is the turbo pushing out more air than the engine can handle. Ex. Wot at 2,000rpm in 5th gear.
Run a dedicated 1/4" min dia line to the bov and try again.
Run a dedicated 1/4" min dia line to the bov and try again.
Last edited by n2oiroc; Oct 20, 2011 at 01:29 PM.
Oct 20, 2011, 03:31 PM
#11
Evolving Member
Thread Starter
iTrader: (2)
Join Date: Sep 2009
Location: North Carolina
Posts: 192
Likes: 0
Received 0 Likes
on
0 Posts
If you are getting surge at half, full or any other throttle position than closed, its not the bov assuming its plumbed correctly which it sounds like its not. Generally compressor surge is the turbo pushing out more air than the engine can handle. Ex. Wot at 2,000rpm in 5th gear.
Run a dedicated 1/4" min dia line to the bov and try again.
Run a dedicated 1/4" min dia line to the bov and try again.
Nov 29, 2011, 08:33 PM
#14
A few things to understand about the stock bov vs. the tial unit. The stock unit utilizes a bottom port, which I don't believe is integrated on a Tial. Another factor is I am probably using too stiff of a spring. The bottom port pressurizes the underside of the diaphragm making the response very sensitive during light loading creating a pressure differential across the diaphragm. When you combine this with pressure on the valve it can allow the BOV to open.
The challenge when using a dual port BOV is it becomes more difficult to run higher boost pressures because the diaphragm is essentially neutralized under full boost(top/bottom see same pressure) so the spring force has to be larger than the force on the valve(exerted by the pressure) itself or the valve opens. In the case of the IX BOV most say it won't support more than 29psi.
My -8psi spring arrived today so I will try that first. I will look into adding a bottom port, but need to be able to control when it is on/off. Probably a hobbs switch with a solenoid will allow me to cut off the bottom port above 10psi or so.
I saw that TurboSmart makes a control unit for this exact issue and even tested it on an EVO, but I don't think sensing voltage decrease would help part throttle surging where voltage remains constant.
TurboSmart BOV Controller
Nov 29, 2011, 09:06 PM
#15
I recently switched from the factory IX BOV to the Tial QR BOV and now have the same issue. Prior to the swap I was not experiencing the part throttle surging so I would say that it is contributed to the BOV.
A few things to understand about the stock bov vs. the tial unit. The stock unit utilizes a bottom port, which I don't believe is integrated on a Tial. Another factor is I am probably using too stiff of a spring. The bottom port pressurizes the underside of the diaphragm making the response very sensitive during light loading creating a pressure differential across the diaphragm. When you combine this with pressure on the valve it can allow the BOV to open.
The challenge when using a dual port BOV is it becomes more difficult to run higher boost pressures because the diaphragm is essentially neutralized under full boost(top/bottom see same pressure) so the spring force has to be larger than the force on the valve(exerted by the pressure) itself or the valve opens. In the case of the IX BOV most say it won't support more than 29psi.
My -8psi spring arrived today so I will try that first. I will look into adding a bottom port, but need to be able to control when it is on/off. Probably a hobbs switch with a solenoid will allow me to cut off the bottom port above 10psi or so.
I saw that TurboSmart makes a control unit for this exact issue and even tested it on an EVO, but I don't think sensing voltage decrease would help part throttle surging where voltage remains constant.
TurboSmart BOV Controller
A few things to understand about the stock bov vs. the tial unit. The stock unit utilizes a bottom port, which I don't believe is integrated on a Tial. Another factor is I am probably using too stiff of a spring. The bottom port pressurizes the underside of the diaphragm making the response very sensitive during light loading creating a pressure differential across the diaphragm. When you combine this with pressure on the valve it can allow the BOV to open.
The challenge when using a dual port BOV is it becomes more difficult to run higher boost pressures because the diaphragm is essentially neutralized under full boost(top/bottom see same pressure) so the spring force has to be larger than the force on the valve(exerted by the pressure) itself or the valve opens. In the case of the IX BOV most say it won't support more than 29psi.
My -8psi spring arrived today so I will try that first. I will look into adding a bottom port, but need to be able to control when it is on/off. Probably a hobbs switch with a solenoid will allow me to cut off the bottom port above 10psi or so.
I saw that TurboSmart makes a control unit for this exact issue and even tested it on an EVO, but I don't think sensing voltage decrease would help part throttle surging where voltage remains constant.
TurboSmart BOV Controller