ok i think i figured out my boost problem. i was wondering if you guys with non ported shroud gT35r have boost issues from 20psi+.. I get some horrible surging going more then 20psi. If you did have problems did a ported shroud help

 

mine is fine at 11lbs

 

Perhaps your blow off valve is inadequate.

 

I read somewhere about a month ago that the ported shourd is not prefered at all due to some explanation I cant remember.

 

never had a problem with surging on my setup.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by N20civicB18 &raquo;</TD></TR><TR><TD CLASS="quote">mine is fine at 11lbs</TD></TR></TABLE>
mine is perfect at 20psi but once i go more it starts surging

 

Sounds like your bov is not adjusted correctly or something else is wrong. I know a handfull of people runnign over 30psi with that and 0 problems..........

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 96 GSR-T &raquo;</TD></TR><TR><TD CLASS="quote">I read somewhere about a month ago that the ported shourd is not prefered at all due to some explanation I cant remember.</TD></TR></TABLE>

yea they said it makes less power and thats BS... ported shroud helps the life of the turbo and im making 660 hp on that turbo with it so I dont see the problem

 

I looked at your turbo....yours has the holes drilled in it correct.....what about this housing?

 

thats a different style..The one I have is drilled by precision

 

i am also running the gt35r in my car been about 4 months now i say...no problems at all bad wg i don't hit 15psi early on i creep to 15psi...but my Tial 44mm is on its way hopefully that will cure my problem...right now running innovative wg with a 10lb spring and hallman MBC

haven't had the honor to boost that high yet...i have the ported shroud...

 

You mean the "speed holes"? It seems the Garrett anti-surge slots that are casted into the cover would be much more effective.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Teglove2 &raquo;</TD></TR><TR><TD CLASS="quote">Sounds like your bov is not adjusted correctly or something else is wrong. I know a handfull of people runnign over 30psi with that and 0 problems..........</TD></TR></TABLE>
my HKS SSQV is all the way loose, i have tried every setting on it and it still surge's. It surge's fo a little then stops at 6k or around there. It really bother's me. Im going to try the drilled shroud they are like 200 bucks and it it doesn't fix the problem i'll freak out

 

Try a different vac source for your blow off valve first. Or upgrade to a bigger BOV. Some Supra guys run 2 BOVs.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Muckman &raquo;</TD></TR><TR><TD CLASS="quote">Try a different vac source for your blow off valve first. Or upgrade to a bigger BOV. Some Supra guys run 2 BOVs.</TD></TR></TABLE>
hmmm i'll try a diff vac and see what happens

 

What AR turbine housing is it running - please tell me it is a propper GT35 turbine housing and not some bored out bastardised ring in .

Cheers A .

 

Get your coolant sensor replaced, I guarantee that's your surging problem if you haven't already. Surging happens on a stock K03 turbo that's chipped at 17-20psi which screws the coolant sensor.
Replace the Coolant Sensor with ONLY THE OEM VW part. Not a jobber pos part. It's like 30$ for the dealer and you might be able to get a coolant sensor under warranty.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by discopotato03 &raquo;</TD></TR><TR><TD CLASS="quote">What AR turbine housing is it running - please tell me it is a propper GT35 turbine housing and not some bored out bastardised ring in .

Cheers A .</TD></TR></TABLE>
.70 for the compressor the big 4" inlet, and .63 a/r for the exhaust. Its a genuine garrett turbo.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EM2Civic &raquo;</TD></TR><TR><TD CLASS="quote">Get your coolant sensor replaced, I guarantee that's your surging problem if you haven't already. Surging happens on a stock K03 turbo that's chipped at 17-20psi which screws the coolant sensor.
Replace the Coolant Sensor with ONLY THE OEM VW part. Not a jobber pos part. It's like 30$ for the dealer and you might be able to get a coolant sensor under warranty.</TD></TR></TABLE>
its not the problem i have like 3 extra green coolant temp sensors, I ran over 24psi on stock turbo and didn't have problems... Now im having this problem i had the exact same problem with my t3/t4 50 trim .63 a/r and same boost if over 20psi everything would go crazy.

I just tried a diff vac sorce and it did nothing it was the same as before

 

Sadly I think you'll find that a GT35R with the Garrett .63 GT housing will surge because the gas speed through the turbine housing is a little high . What that does is attempt to drive the compressor faster pushing more air into the donk that it can accept . If you want to stay with that turbo I would consider the .82 AR turbine housing the minimum .

Its a common mistake to think that small AR turbine housings are the go to excite big turbos on small engines . Even if the turbo doesn't surge the turbine inlet pressure will go through the roof and if pushed promote detonation and damage something . High TIP makes searing hot exhaust gasses reverse back into the combustion chambers in the valve overlap period because exhaust manifold pressure will be higher than inlet manifold pressure . Its a lose lose situation because not only are the spent gasses poluting the incoming air charge its preheating it as well . Terminal detonation lives down that road .

Depending on what power level your chasing a GT30R in medium or large turbine housing AR may have been more appropriate . It should manage enough wind for ~ 500Hp if everything else is suitable .

Cheers A .


Modified by discopotato03 at 12:52 PM 4/7/2006

 

.82 might cause more lag then i already have or want. I pressure checked the whole system and found no leaks... I dont think the .63 housing is causing my problems. I think i need a drilled/ported shroud and a EBC

 

you may be hearing a fluttering noise that may infact be the wastegate fluttering open and closed.....almost all the turbos from gt35R come with and anti surge housings...precision charged me 45$ to drill my housing

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by D@nnY &raquo;</TD></TR><TR><TD CLASS="quote">you may be hearing a fluttering noise that may infact be the wastegate fluttering open and closed.....almost all the turbos from gt35R come with and anti surge housings...precision charged me 45$ to drill my housing</TD></TR></TABLE>
nope i didn't get the ported shroud. I just have a normal big 4" inlet one... I will see if i can send out my housing to get it drilled or just buy a new housing for 200 bucks...

When i had my t3/t4 57 trim .63 a/r i had the same issue, but most said its cause my turbo spooled to fast for its own good i had like 23psi by 4000rpm.... What should i look for in the wastegate if it is bad