Surge happens when the BOV doesnt vent enough pressure and it causes the Compressor wheel to slow/stop because the pressure has become too great. I also have anti-surge ports on my turbo so not something Im worried about currently.

The sound you can hear when you listen to all of my vids is the turbo sucking in air and then the BOV come open.

What does your's sounds like?

uploading video now

Cobalt SS PT5557 - YouTube

The first 20 seconds or so is all that is really relevant. Its kinda hard to hear too.

has anyone done a turbo swap and kept the sc coolant stuff? like the intake manifold dual pass and option b and heat exchanger and such?

FrossB what rpm is your turbo full spool by?

25psi at about 4000

oh ok didn't want to feel alone. im on my 256 right now full spool at 4000rpm also on 19ish psi i believe. whats your car make on 25? also what map sensor are you running? my stock lsj only reads up to 20.1 psi then after that its all game i need a better map sensor now

stock lnf sensor. on that 25psi and 11* timing up to i made 407hp/391trq

Im going to drop some psi and run E..hopefully stay at the same power level but have less boost...that is until i build my engine haha

I have this summer base tune I'm going to start from when I get my s256et on the car. Its for e. I think the timing is 20 degrees and I'm gonna put the boost at about 20psi and start from there.

thats probably where ill end up after going full E. 18-20psi range. but hopefully at the 400hp range

hmm so the stock lnf sensor reads past 20 psi in hptuners? my car made 413 and 382 on 22 psi

What was your timing?

I think 20 degrees I can't remember right off the top of my head.

Should have the tial bov by tomorrow. Gotta love how quick I get stuff from zzp

I was kidding about the surge! hahahahah

You can find some good deal on Tial Qs. I bought mine for 50$ without a spring because they thought the Diaphragm was torn, but it was perfect.

So does the LSJ I thought 23ish PSI

good numbers pal, 20* on 93? any or no knock??

yes. stupid though imo.

If it was a more efficient system I think it would work great, but the laminova system sucks.

terry11 did it for a while I believe. Nothing to brag about.

the lsj map is maxed at 21.7. Im running a 3bar on my tvs setup, the problem is even with the right scaling, the lsj pcm cant read the higher boost from my 3 bar anyways. i left it in the car and just went to an autometer es 30psi boost gauge

i've been on the 3 bar map since I switched over to turbo.

Idk honestly how far the stock map runs and yep on 93 and pulled the knock out. It only knock when Turbo started spooling had a lil to much there so its knock free :)

The GM 3 bar map loco?

yep. the same one they sell for the lnf.

FrossB, the che-che-che sound that your turbo makes after the pssh from the BOV is compressor surge. It also made it on your first shift in the video and no BOV sound was made which means it either didnt open or didnt open much. Any time your car goes into or near boost, your BOV should come open as soon as your throttle plate closes. It will eventually kill your turbo. There should be an anti-surge compressor housing for your turbo or a softer spring in your BOV. I really like this style housing:

http://www.realstreetperformance.com...ision6262d.jpg

The holes are "anti-surge" ports that vent pressure as well during throttle plate closed situations.

chris, I know your giving me shit lol, We have a couple of boxes of Tial BOVs at work that they install on the CNG trucks during their conversion. Ive been considering "borrowing" one lol.

No real point in swapping over to the 3 bar MAP sensor on the LSJs. The MAF will do pretty much everything you need it to do and it can read up to 16000. Im not sure but Ive heard that ZZP has some unlocked maps that allow you to tune past the factory limits of 11xxx. Maybe someone will have more insight on that than I.

Ugh, I need new rings so I can make more horsepowers...

thats what i figured. i tried getting Treadstone to hook me up with that anti-surge porting but no go lol.

guess i need to get a new spring then eh?

I def would, a softer spring will save your turbo later, the housings arent horribly expensive, you can possibly find a blown turbo with that compressor housing for cheap and swap it on to yours.

what spring would you recommend?

all i can really find on Turbosmart's website is an 18 in/hg spring for my bov

Ive not gotten a lot of experience with the turbosmart BOVs, what spring is in it now? is your BOV hooked up to vacuum? the nipple on top of the BOV being hooked up to vacuum will help the valve to open as well

well according to the spec sheet on their website, i have the 18 spring. and my bov is hooked directly to the intake manifold port

You do need to borrow one! I get no surge, flutter, anything. I love my Tial.

Also ZZP doesnt do it really, its the trifecta overlay. Basically its an expensive way to have a Mini AFC, around 300 for the tune. Trifecta manipulates the MAF values like the AFC does but the thing is the AFC is more controllable, not just set in the tune like the overlay.

You need new rings and pistons my friend! haha

Thread stuck

That surge is terrible, fix that ASAP. Vivid sells a 15, amazon sells a 10-15. I think you need a blue.

only time i heard his surge was when he was in light boost lol but yea technically shouldn't ever happen my tial blows clean all the time

x2...

Can anyone get me a link to this map senor couple people mentioned in here

its on ced site for like 18 bucks. But like i said youre wasting your time pcm cant read over 21.7 pounds of boost anyways. Just tune around it

what number is the blue? 15?

thanks

I need a new motor, with the cams that we were talking about today, rev this damn thing way out and watch the number climb. Then who cares if it doesnt spool til 4800rpm, itll rev up over 8000, Ill have plenty of power band lol.

has anyone ever ran an SAFC on an LSJ? I had one on my DSM way back when but never considered installing one on this car. As always, if Trifecta sets it up, only vince can change the values im guessing. I dont get why someone that can unlock and manipulate so much cant share that ability with others. I have a friend here with a Trifecta tune on his SC and the AFR is like 11.3 at WOT, and timing is low compared to other cars with the same pulley that Ive worked on, he keeps begging Vince to make the tune more aggressive and Vince flat out says no. blah lol I guess if all else fails Ill just plan a MOTEC or AEM standalone setup in the future.

Thanx a ton, been waiting to see when that would happen

bingo, no need for it, just set up your map tables in case your maf fails, as long as the maf is good, just use it.