twins are alive and well
Jul 17, 2006 | 07:01 AM
#14
Originally Posted by real96SS
Hey man, that sound you are talking about, seems alot like compressor surge.
what kind of BOV's are you running?
i know certain BOV's are so stiff that lower boost's might not cause them to open.
So to me it seems that if you have the really stiff BOV's, like i think you do with the size of your turbo's, this is what is happening
1: you get on it, spool a little
2: you let off, BOV's pop, pressure is released
3: since you have an automatic, still a slight load on motor, turbo's continue to spool just a lil (but not very much) causing compressor surge because it is not enough boost to open the BOV's
solution, i dont know. if your boost gauge is on manifold (after TB) try running it off of your charge pipe (before TB) and see what it reads when you here the noise.
I'm no expert, just a guy that has been around alot of fast cars, and this seems to make sense to me.
let me know
by the way, kick a$$ set-up. The welds look great. cant wait to see you in HotRod again.
what kind of BOV's are you running?
i know certain BOV's are so stiff that lower boost's might not cause them to open.
So to me it seems that if you have the really stiff BOV's, like i think you do with the size of your turbo's, this is what is happening
1: you get on it, spool a little
2: you let off, BOV's pop, pressure is released
3: since you have an automatic, still a slight load on motor, turbo's continue to spool just a lil (but not very much) causing compressor surge because it is not enough boost to open the BOV's
solution, i dont know. if your boost gauge is on manifold (after TB) try running it off of your charge pipe (before TB) and see what it reads when you here the noise.
I'm no expert, just a guy that has been around alot of fast cars, and this seems to make sense to me.
let me know
by the way, kick a$$ set-up. The welds look great. cant wait to see you in HotRod again.
The solution seems simple... GET ON IT!
Jul 17, 2006 | 10:02 AM
#17
TECH Fanatic
Joined: Apr 2003
Posts: 1,107
Likes: 2
From: Albuquerque, NM
Great job! Congrats, the wait should be worth it.
I agree on the noise, it's compressor surge. Is you BOV a sequential or standard? You might need a larger flange, opening adjustment, or change the line source.
I agree on the noise, it's compressor surge. Is you BOV a sequential or standard? You might need a larger flange, opening adjustment, or change the line source.
