So I have been running my turbo for about a year now on my KA. the Turbo was blowing smoke when it was first installed so it was all ready on its way out the door. I was lucky enough to get one year out of it before last night.
The turbo is completely dead fins bent bearings destroyed and so much shaft play it may has well fall out. This turbo just before it died would eat 3 liters of oil every month.
One thing i wanted to make sure of is that I stop my turbo fluttering on my KA before I install a replacement (believe me this is not as easy as it sounds). I want to run my BOV atmospheric to relieve stress on the new turbo but as i have discussed before in other posts this will cause the engine to run rich when the air is released and cause the engine to flood. I know when the BOV is simply running atmospheric the turbo dose not flutter and when run rec it will flutter.
My question is is there a cheaper simpler solution to fix this deceleration flood conditions with out using a SAFC. My engine runs perfect as it is so i don’t need fancy options just want to fix the flooding when I let off the gas. Any ideas or options are appreciated.
Hi Clutchfire.
Recirculation shouldn’t cause compressor surge or “flutter”. That comes from bov not opening up to release extra air when you release gas pedal and throttle plate closes. My guess is that you got 1 of 3 things happening:
Either your BOV spring is too tight and the vacuum building up in the throttle body after you release gas pedal is not sufficient to open it.
Your bov is seized up.
Try inspecting them to see if the bov “piston” can move up & down freely. If it can (assuming it has factory spring), just loosen the spring tensioner bolt until it stops causing flutter AND yet keeps it closed during idle (vacuum will be around 19-22 Hg).
Check your hose - old mushy 1/8" hoses or non-vacuum hoses can collapse under vacuum. You can inspect this by vacuum pump (reliable) or by hand (squeeze it). I’ve seen it happen before that the hose would collapse before the bov would open causing the BOV not to open. So everything looks good visually, bov appears to be ok but hose doesn’t perform and you still get the flutter.
And as far as recirculation - it shouldn’t cause stress on the turbo.
Yeah I have done all that before. vacuum is perfect in the hose, the BOV piston moves freely the problem is the difference between idle and deceleration. its not extreme enough in the KA. maybe 5-8 PSI difference. there for in order to keep the valve close at idle it wont open enough at dec and to have it open enough at dec it will be open at idle.
what I have noticed is if I don’t run it rec it makes the hole pushhhh sound and 0 flutter but can run rich at idle because the BOV is slightly open and can flood at dec. I been looking around at other options with little to no luck maybe the best idea is to run an SAFC along with my chipped ECU.