i tried searching and now know what it is but i seen someone posting saying they have compressor surge, how can you tell? From what i gather its air coming back to the compressor stoping the blades, normally happens in a w/o bov setup. so how would you know?

 

When you change gears in boost you will hear cha cha cha cha instaed of the BOV's normal pshhhhh. This is compressor surge.

 

http://videos.streetfire.net/v...0.htm

 

what would cause compressor surge?

 

compressor surge is normal, back in the day when we had no blow off valves, it made the cha cha cha sound (i like that he hee)

compressor surge is any time the turbo comes to an abrupt halt due to the throttle closing. its more prominent on a manual car because of the gear changes.

it wasnt necessary on the gns and t types because of them being automatics, but there was more than one occasion where i popped off the charge pipe to the throttle body on a pass because i didnt have one.

 

thats funny with the charge pipe blowing off im guessing you still dont have as bov? , thanks guys for al lthe help!

 

sold the car in 97. on my eg race car i do have a tial 50mm.

 

I LOVE compressor surge I took my BOV off for it

My comp surge is more like bop bop bop bop so tight haha @ 15 psi

 

i listened to it yesterday, it doesnt cha cha cha so no compressor surge, but its still not that loud, and if im just idling it like starts wistling by its self then stops, wierd tried the pcv and nothing changed i think i just need to be tuned.

 

nevermind i found a website its normally quiet unless i hookup the 2nd vacuum line to the bottom nipple.

 

so is compressor surge that bad? i just found out iv been having that for like 3 months, some one told me its really bad, but some tell me it happens an wont hurt it.

bump for info!

 

93
Well, there are really 2 ways to have surge.
1. As stated before, when there is no way to vent boost with the throttle plate closed. I think it does sound cooler. I also feel that it is relatively safe as a good deal of car have gotten away bov-less for high miles, even under high boost. The wheel does'nt come to an abrupt stop but is slowed down. As exhaust pressure is minimal with the tp closed, so are the loads on the wheel. A properly built turbo should be able to take it. Of course, I never tried this myself, as my car has a draw through carb setup with the comp after the tp and does'nt need a bov.
2. When the compressor flow is too much for the engine to take. Common on small turbine, huge compressor combos on small engines. This is the really harmful one as the loads on the turbo are much higher when this happens at wot.
93 93/93

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by riddlinkid1986 &raquo;</TD></TR><TR><TD CLASS="quote">so is compressor surge that bad? i just found out iv been having that for like 3 months, some one told me its really bad, but some tell me it happens an wont hurt it.

bump for info!</TD></TR></TABLE>

It is bad. Think about it. You have air compressed into piping (which goes from the turbo to the intake manifold) and when let go of the throttle and the throttle body snaps shut. The turbo (which is still spinning) continues to push air into a fixed area with a closed end. The result = excessive wear and tear.

 

GOOD points! thanks!

Well how do you get rid of it? i have a few dents in my Charge Piping, like it was squashed a little to fit around my fog lights, an that is coming from the compressor to the Inter Cooler.

My surge is right befor the blow off, its weird. I even have 2 vac lines to my bov.... huuumm.....