Jerking on deceleration

[nawz8r]

Installed a Greddy RS bov today and took the car for a spin. Was kind of hard on it to hear the bov. Don't know if the bov has anything to do with it, or just coincidence. A problem just developed where the car begins jerking back and forth when decelerating in 2nd gear. It's like when the car starts lugging when you come to a stop because you forget to push in the clutch, except the jerking starts some time before it's time to clutch. Another description is: as you decel, the engine slows you down, but when the jerking begins it's like something slips - releasing the engine and coasting the car, but then quickly catches again. I fear it's not going to be good news, but lets have it. Any ideas? Thank you.

[daddy]

Your car has AIDS.




Check for boost leaks.

[Turbo Powered]

Could be compressor surge. Try backing off the BOV adjustment, making it looser, opening sooner/at lower pressure, see if that doesn't reduce the jerking. A tighter BOV setting will hold boost better (less likely to leak), and you can actually adjust your driving style to eliminate the jerking, you just need to clutch-in sooner than before.

[lawdogg]

x2 (lol)

If you're running open atmosphere, welcome to world of running open atm. on a draw-thru MAS.

[nawz8r]

Originally Posted by Turbo Powered

Could be compressor surge. Try backing off the BOV adjustment, making it looser, opening sooner/at lower pressure, see if that doesn't reduce the jerking. A tighter BOV setting will hold boost better (less likely to leak), and you can actually adjust your driving style to eliminate the jerking, you just need to clutch-in sooner than before.

Backed off the bov spring tension, and yes that reduced the bucking - what a relief, great! Thought something went bad with the drivetrain, especially since I just posted a thread about synchromesh in the TC, lol.

It is open atmos., but may be going back to recirc soon. Need to experiment a little, see what I prefer. You guys are the greatest, thanks for the input.