Turbo bark (compressor surge)

[RabbitJockey]

yeah itd be tough unless you let off the gas completely every time u shifted, then it'd be easy you could just have a microswitch that operates a valve that sends the proper signal to the bov.  i wonder if it could operated using emps some how like when the difference is above 10psi or something the bov opens

[bgbmxer]

mine does it to i wouldnt call it a bark tho but i also dont have any really restrictive flow. if i redo my piping ill probably put a bov in my piping and use the vuccume pump as a vac source and a micro switch on the throttle lever of the injection pump. pending it getting sold anyways haha

I don't think that this is as big of an issue as people make it out to be. Especially since u have no throttle body to slam closed. Look at cars like the grand national and others who came without blow off valves and such and still work plenty good. A bov wouldn't hurt tho

[CRSMP5]

who ever says i do is wrong.. me has no bark at all from teh turbo.. and i have straight pipe off mine.... 2" ic pipes into my big honkin ic..

[bgbmxer]

It could easily be done. You have a constant vac source. You would need a switch of somekind on the throttle somewhere. A blow off valve and a vac solenoid off a regular car goin from the vac port of the bov to the vac pump which is switched on by the switch. I would think that the hks ssqv blow off valve would be the best seeing as it uses boost pressure to seat the seal and no springs to overcome in vac but I could be wrong.

[CRSMP5]

use a vacume pod from a distributer.... have boost move it.... and when no boost open up blow off.. way over thinking this...

[81 vw pu]

but, how to operate it?!

My bad forgot about the lack of vacumn.

What about one of those supercharger surge protectors/ bypass valves mounted in the charge piping.
Even cheaper, would a stock vw pressure relief valve hold up to higher boost (15-20 psi) with a stiffer/shimmed spring?

[bgbmxer]

Always have vac from the vac pump

[R.O.R-2.0]

my boost never surges tho.. it drops when i shift, not rises. so i couldnt use the boost as a signal for a valve..

gotta remember, this is not a gasser engine, and it DOES NOT have any sort of vacuum suitable to operate a blow off valve..

you need a vac signal that comes on as the throttle closes..

on a vac pump, the signal rises as the RPM rises..

im just gonna build a downpipe, and see if the surging goes away..

[bgbmxer]

my boost never surges tho.. it drops when i shift, not rises. so i couldnt use the boost as a signal for a valve..

gotta remember, this is not a gasser engine, and it DOES NOT have any sort of vacuum suitable to operate a blow off valve..

you need a vac signal that comes on as the throttle closes..

on a vac pump, the signal rises as the RPM rises..

im just gonna build a downpipe, and see if the surging goes away..

If it pulls any vac it will be suitable for the hks bov. Did you not just read what I posted earlier about using a micro switch and a solenoid.

Also my boost drops off immediately also
Have a 2 1/4 inch exhaust biggest restriction is the muffler. It will still make that sound

[R.O.R-2.0]

everyone is overthinking this.. there is an EASY solution somewhere..

and i ABSOLUTELY HATE the sound of blow off valves.. so im not running one..

and why am i the only one who this has ever happened to?

nobody else runs a BOV with a K24.. if i cant get rid of the turbo bark, im going to change the turbo..

[BillyWillicker]

I really can't suggest adding a blow-off/diverter valve on a diesel.  I've personally run 3k turbos VERY hard, 2.5bar with no bov or diverter valve in the system at all.  Even with the CIS on my old 5ktq it sounded like a rally car, whoosh-whistle-scream-chatter - every gear.  Although this was on a gasser, its the same thing happening.  I only used one turbo throughout the time I ran the car, 2 engines, 100k miles of abuse.  I used the turbo that I had put the abuse on because I had spares and figured I would save the "better" ones when it died, it didn't.  

K26 turbo, I got the car with 224k miles with the odo broken.  Was original engine, OG headgasket.  Drove it for 3 years daily while upping the boost/tune progressively.  I replaced the engine due to noise, put that turbo on a new lower end with a big valve/ported head and larger intercooler/exhaust.  I even added EFI to it and pushed it HARD for a LONG time.  

I found that when I added a diverter/bov it really softened the boost rise/response and promptly removed it.  

[R.O.R-2.0]

one other thing that i must say again, i still have NO DOWNPIPE, and someone else mentioned that K24s bark with no downpipe.. that may be the ONLY thing that i need to do, is finish building my downpipe..

ive driven my car less than 10 miles since installing the K24.. ive driven it enough to know that it barks.. thats all.

[spencebm]

everyone is overthinking this.. there is an EASY solution somewhere..

and i ABSOLUTELY HATE the sound of blow off valves.. so im not running one..

and why am i the only one who this has ever happened to?

nobody else runs a BOV with a K24.. if i cant get rid of the turbo bark, im going to get rid of the turbo..

haha...get rid of your turbo then and quit yelling at every other person on the site that uses one

[RabbitJockey]

i don't know that it's such a big deal, so long as it's not surging while you're accelerating.

[R.O.R-2.0]

ben, both of your responses to this thread have been somewhat irrelevant.. thats not like you

please quit cluttering my thread with your useless nonsense.. if it doesnt have something to do with your own problems and experiences, or my problem at hand, then please keep your comments to yourself..

both of your responses in this thread have made me think "man, wtf is this guy going on about?"

so, whats up with that? usually you atleast post about something pertaining to the thread at hand, but lately, you havent had anything worth while to say..

and who was i yelling at? what was i yelling about?

im baffled.. i really dont get it..