EBC External Wastegate Flutter
#1
EBC External Wastegate Flutter
Morning People!
I've since had my boost turned up to 24psi using the DIYautotune EBC (https://www.diyautotune.com/product/...-solenoid-kit/)
all is well. But I'm getting Wastegate flutter noise.
Dimitris (MSLABS) has advised to play with the EBC frequency. which I'm going to have a little play with later. Thanks for the advise Dimitris
I understand this is normal due to the EBC working. But god does it sound ugly and i be great to reduce if not remove the flutter.
Just wondering if anyone has had similar experience and had a fix. (I'm hoping changing the frequency will. But thought I still see if anyone else had this issue)
I've since had my boost turned up to 24psi using the DIYautotune EBC (https://www.diyautotune.com/product/...-solenoid-kit/)
all is well. But I'm getting Wastegate flutter noise.
Dimitris (MSLABS) has advised to play with the EBC frequency. which I'm going to have a little play with later. Thanks for the advise Dimitris
I understand this is normal due to the EBC working. But god does it sound ugly and i be great to reduce if not remove the flutter.
Just wondering if anyone has had similar experience and had a fix. (I'm hoping changing the frequency will. But thought I still see if anyone else had this issue)
#2
Little update.
It was the EBC. As it's a on / off motion. it was causing the EWG to flutter.
Changing the HZ slowed it down or made it faster depending on which way I went.
I'm going to fit a N75 valve as they run quite high HZ so much faster on/off motion to prevent the flutter.
For the time being I've gone back to a MBC which is working perfectly with zero problems or odd noises.
It was the EBC. As it's a on / off motion. it was causing the EWG to flutter.
Changing the HZ slowed it down or made it faster depending on which way I went.
I'm going to fit a N75 valve as they run quite high HZ so much faster on/off motion to prevent the flutter.
For the time being I've gone back to a MBC which is working perfectly with zero problems or odd noises.
#3
Lawone,
Were you able to determine the maximum operating frequency and usable duty cycle range for the N75 valve? I have the same issue on a TD04HL with a log manifold and Tial 38mm using a 4 port EBC configuration. MAP is stable at 20hz+ because the intake system volume damps the pulses but the acceleration/deceleration of the turbine sounds horrible at even 40hz.
Thanks!
Were you able to determine the maximum operating frequency and usable duty cycle range for the N75 valve? I have the same issue on a TD04HL with a log manifold and Tial 38mm using a 4 port EBC configuration. MAP is stable at 20hz+ because the intake system volume damps the pulses but the acceleration/deceleration of the turbine sounds horrible at even 40hz.
Thanks!
Last edited by cwatson; 10-31-2017 at 12:50 PM.
#5
Constraints:
- Tial 38mm EWG with 7psi spring
- TD04HL 9 Blade Turbine
- Audible (bad) compressor wheel/wastegate fluttering up to at least 40Hz (at the EWG inlet/outlet)
- Desired closed-loop boost control range: ~7-30 psi (150-300 kPa)
- MAPdot equal to applying boost pressure to EWG close port with atmosphere on the EWG open port (spool time limited by spring and available boost pressure to keep EWG closed)
- Idle valves are readily available valves for PWM proportional flow control but would need custom manifold (e.g. GM needle type)
- Industrial 12vdc proportional valves are uncommon and expensive; OEMs: Clippard, Parker, etc
- 240cc fuel injector had quickest response time but not enough flow to control pressure
- Quickest OTS solenoid I found (but 24vdc): SX10, 2 Port High Speed Valve | SMC Corporation of America
#6
Update to this - my flutter problem was related to leaks at the wastegate mount and turbine to manifold that developed at high temperature. The wastegate action was audible because of the leak. I since welded these joints (in addition to large inconel fasteners) and no longer have the problem. The charts above are still valid for MAP vs EBC duty.
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