Is my blow off valve far enough from the throttle plate.. its right about 7 in's away but i had a turbo destry itself due to compressor surge... i have a real hks bov on the way (ebay one is on there now), do you think it was just a shitty bov or is my placement bad? Thanks !

 

your placement is fine.
having one is better then nothing, placement isnt that bigga deal.

 

What kind of HKS bov?

 

was the turbo you blew (and i quote) "because of compressor surge" an ebay turbo by chance? If so, i don't think the blow off valve was the cause of its destruction. Are you running an oil restrictor with your feed line?

Your location is fine. somewhere after the intercooler and before the throttle body is the prime location for quick response. however there are setups with the intercooler being after the turbo and before the intercooler (which work flawlessly as well). The only reason i prefer the aft intercooler/on upper charge pipe location is for ease of adjustment, replacement, etc.

 

yeah the old turbo was egay with no restrictor... i am 90 % it was from surge beacuse the nut on the compressor wheel spun itself off between a hard shift from 2nd to 3rd. the shaft was just sitting free since the nut came off and the exhaust turbine fell loose and seized/destroyed itself along the entire shaft bending to a good 45 degree angle. The blow off valve used to blow off anything above about 5 psi or so (adjusting nut loosened all the way). Fired the car up today to test it since i dont have a vaccum tester, and when i gave it throttle in neutral the bov didnt move at all.. have an old hks(one with adjusting nut) coming tomorrow so ill be able to see if thats the problem.. Thanks for the repies everyone

 

If you had compressor surge you would be able to tell..

Did you hear a "chop chop chop" noise when the throttle was closed?

Also I agree on the placement.. perfecto.

 

Of course there is little surge under 5psi it was a 57 trim turbo.. but its hard to hear it under full boost over the blow off valve.. Im thinking the spring in the bov was shot and didnt realease enough of the charge.

 

did you check all the bolts prior to installing the turbo? i assume its like their LSDs and Wastegates -- check em and make sure they are all good before installing. If thats not the case then, well... i guess we have proof that compressor surge fails turbos

 

you need to change your BOV reference

The line you have it reading off does not see enough vacuum to open the valve fast enough and will give u surging.

I have a SSQV (real) and I was getting insane surge using that nipple your using as a reference. Switch the line to the brake booster and youll see your BOV will have a completely new, much cooler sound! and no surge!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbotime &raquo;</TD></TR><TR><TD CLASS="quote">you need to change your BOV reference

The line you have it reading off does not see enough vacuum to open the valve fast enough and will give u surging.

I have a SSQV (real) and I was getting insane surge using that nipple your using as a reference. Switch the line to the brake booster and youll see your BOV will have a completely new, much cooler sound! and no surge!

</TD></TR></TABLE>

THANK YOU!!! I HAD A FEELING IT WAS A WEAK SIGNAL... I APPRECIATE IT

 

FIXED!!! no surge at all.. just relocated the vac line.. thanks all

 

actually i think that line never gets vacuum, looked good though. if it does its ported vacuum probably. like only applies vacuum during a certain rpm range usually off idle.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by agrn93ls &raquo;</TD></TR><TR><TD CLASS="quote">actually i think that line never gets vacuum, looked good though. if it does its ported vacuum probably. like only applies vacuum during a certain rpm range usually off idle.</TD></TR></TABLE>
It gets weak vaccumm so ya your right, there is a bigger port right next to the weak one and the TB and there is no vaccumm from that, i have on idea what kind of TB it is but i dont think its a b18b TB..Weird thing is i have my map sensor hooked upto that now (like when i was na) and it seems to work alright even though its weak.. Im running out of vac ports, should have a got an eagle rail.. future mod maybe?

 

just for everyones info compressor surge will NOT destroy a turbo so dont blame it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 20yrsToMidnight &raquo;</TD></TR><TR><TD CLASS="quote">FIXED!!! no surge at all.. just relocated the vac line.. thanks all</TD></TR></TABLE>

glad to help!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Soccerking3000 &raquo;</TD></TR><TR><TD CLASS="quote">just for everyones info compressor surge will NOT destroy a turbo so dont blame it</TD></TR></TABLE>

I cant see how else the nut would come off the compressor wheel during a hard shift

 

uhh maybe it wasnt tightened, compressor surge doesnt kill turbo's

 

compressor surge kills turbos over time.

if your nut came off you have a bigger problem.

i personally have my BOV in between the turbo and IC.
if anyone cares ill explain why.

bottom line:
as long as you have a BOV that is operating properly you shouldnt have any comperssor surge.
BOVs need to be adjusted, they are plug and play.

 

then why do so many stock turbo cars not have bov's? and they last 100k+ miles

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Soccerking3000 &raquo;</TD></TR><TR><TD CLASS="quote">then why do so many stock turbo cars not have bov's? and they last 100k+ miles</TD></TR></TABLE>

Such as? Lots of them are the recirculation type and are not easily visible and make no noise.

 

there are quite a few fords and 80's vehicles that do not have a bov of any kind

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Soccerking3000 &raquo;</TD></TR><TR><TD CLASS="quote">there are quite a few fords and 80's vehicles that do not have a bov of any kind</TD></TR></TABLE>
This is true but im sure they were all small turbos

 

shouldnt matter