Compressor Surge Problem!
#1
Evolved Member
Thread Starter
Compressor Surge Problem!
Hi,
im hoping to get some tips on how to overcome my compressor surge problem.
ATP GT3076R
GSC S2
2.0L engine with stock head & intake
Turbosmart Race Port Bov
When partial lift off at higer rpm (around 5500~6000rpm) engine will judder massively and if WOT all the way no plm at all.
Only happen when partial lift off.
Been told that it cant really be solve as the turbo is supplying more air than the engine can consume.
Is there any other way to overcome this problem by not asking me to go stroker?
Thanks
im hoping to get some tips on how to overcome my compressor surge problem.
ATP GT3076R
GSC S2
2.0L engine with stock head & intake
Turbosmart Race Port Bov
When partial lift off at higer rpm (around 5500~6000rpm) engine will judder massively and if WOT all the way no plm at all.
Only happen when partial lift off.
Been told that it cant really be solve as the turbo is supplying more air than the engine can consume.
Is there any other way to overcome this problem by not asking me to go stroker?
Thanks
#2
EvoM Guru
iTrader: (1)
Yes, you can cause the bov to leak in this condition creating a place for that air to go. Ive said it before, but people get thier panties in a bunch when you offer that a bov that leaks under part throttle and transient situations is a good thing. With certain valves this cannot be accomplished. Its a relationship between pressure differential and spring rate. Greddy type s is a good example.
Last edited by 211Ratsbud; Mar 2, 2012 at 01:41 PM.
#3
Evolved Member
Thread Starter
Yes, you can cause the bov to leak in this condition creating a place for that air to go. Ive said it before, but people get thier panties in a bunch when you offer that a bov that leaks under part throttle and transient situations is a good thing. With certain valves this cannot be accomplished. Its a relationship between pressure differential and spring rate. Greddy type s is a good example.
Do you mean i should try using Greddy type S or R bov to overcome my surge problem?
Thanks
![Crap](https://www.evolutionm.net/forums/images/smilies/crap.gif)
#5
Evolved Member
Thread Starter
Yes, i faced premature boost leak on the bov when on a softer spring and ive tried few springs rate combination and its still dont work.
#8
Evolved Member
Thread Starter
When i switch off my profec b II bc the surge goes away and im boosting at wg spring rate pressure - 1.3 bar
You mean i should try a evo 8 or 9 oem metal bov?
Will changing bov to greddy type r able to overcome the surge issue?
I hv even adjust my bc gain to the lowest as its still occur.
You mean i should try a evo 8 or 9 oem metal bov?
Will changing bov to greddy type r able to overcome the surge issue?
I hv even adjust my bc gain to the lowest as its still occur.
#12
Evolved Member
iTrader: (25)
I am working on a fix for this using a hobbs switch and naturally open solenoid. The thought is to have the bottom port open under normal driving and have the bottom port cut off above a certain boost level. This will make it like a standard top port bov such as the TIAL unit.
Good BOV option are the old HKS racing or Greddy Type S.
#13
Evolved Member
Thread Starter
unfortunately, this will not likely solve the problem. My surge issues started when I swapped from the stock IX BOV to the Tial recirculating. You need to use a dual port (like stock IX) to promote valve opening at part throttle low boost acceleration. Unfortunately, dual port will likely open under full boost due to the balance of pressure across the top/bottom of the actuator.
I am working on a fix for this using a hobbs switch and naturally open solenoid. The thought is to have the bottom port open under normal driving and have the bottom port cut off above a certain boost level. This will make it like a standard top port bov such as the TIAL unit.
Good BOV option are the old HKS racing or Greddy Type S.
I am working on a fix for this using a hobbs switch and naturally open solenoid. The thought is to have the bottom port open under normal driving and have the bottom port cut off above a certain boost level. This will make it like a standard top port bov such as the TIAL unit.
Good BOV option are the old HKS racing or Greddy Type S.
#14
Evolving Member
iTrader: (21)
When i switch off my profec b II bc the surge goes away and im boosting at wg spring rate pressure - 1.3 bar
You mean i should try a evo 8 or 9 oem metal bov?
Will changing bov to greddy type r able to overcome the surge issue?
I hv even adjust my bc gain to the lowest as its still occur.
You mean i should try a evo 8 or 9 oem metal bov?
Will changing bov to greddy type r able to overcome the surge issue?
I hv even adjust my bc gain to the lowest as its still occur.
#15
Evolved Member
Thread Starter
Yes, ive just check and confirmed that the surge comes whenever my boost reaches 1.4bar regardless of any rpm. Its comes even at 4000rpm.
Will this means we need a softer spring or harder WG spring?
Will this means we need a softer spring or harder WG spring?