Subaru Enthusiasts Car Club of the Sierras - View Single Post - New to this site, looking for a little guidance

bss · 2010-12-27, 02:38 PM

Hello there. I found this site while I was searching for someone to possibly do an open source tune for me in the Reno area and ended up hitting on a few of the pages on this site. I had no idea there was an active Subaru community around. Pretty Cool. Anyways, hopefully someone will have some suggestions cause I'm in a jam and this is my wife's car! Doh.

I've always owned and worked on my own Subarus (98 OBS, 84 GL, 87 GL, 04 WRX) but this is my first turbo car and while I consider myself fairly handy with a wrench (can do most all medium-duty maintenance without help, rebuilt 2 motors from the book), I may have gotten a little overzealous on this one.

I put an VF39 and some pinks on my car this weekend and while it runs (no leaks, woohoo) it seems like maybe the wastegate is slipping open prematurely or something? Reflashed with AP VF39 /565 Pink CA/AZ/NV 91 octane base map. VF Turbo has stock VF39 WG., and used new UP/DP gaskets.
I am using the vacuum T that came with the VF39, so I'm assuming it has the VF sized restrictor pill.

Other mods are
STI tmic
Perrin inlet, afta maf
Cobb SF intake
Perrin lightweight pulley
Invidia UP
Invidia DP, Borla hush cbe

When boost hits up between around 15-17lb, the turbo kind of "slips" and flutters, the boost needle just fluctuates back and forth, then boost seems to drop off and hold right around 1 mpa again. Boost seems a little slow to build, but when spooling seems to hold boost alright until right around 14 pounds or so. Cobb target boost is 17PSI.

I have doublechecked all of my hose clamps and hoses, they all seem just fine, and worked fine with the td04. AP scan revealed no trouble codes.

any suggestions?

2010-12-27, 02:38 PM	#1
bss n00b Real Name: Angelo Join Date: Dec 2010 Location: Gardnerville Posts: 13 Car: :raC Class: very little	New to this site, looking for a little guidance Hello there. I found this site while I was searching for someone to possibly do an open source tune for me in the Reno area and ended up hitting on a few of the pages on this site. I had no idea there was an active Subaru community around. Pretty Cool. Anyways, hopefully someone will have some suggestions cause I'm in a jam and this is my wife's car! Doh. I've always owned and worked on my own Subarus (98 OBS, 84 GL, 87 GL, 04 WRX) but this is my first turbo car and while I consider myself fairly handy with a wrench (can do most all medium-duty maintenance without help, rebuilt 2 motors from the book), I may have gotten a little overzealous on this one. I put an VF39 and some pinks on my car this weekend and while it runs (no leaks, woohoo) it seems like maybe the wastegate is slipping open prematurely or something? Reflashed with AP VF39 /565 Pink CA/AZ/NV 91 octane base map. VF Turbo has stock VF39 WG., and used new UP/DP gaskets. I am using the vacuum T that came with the VF39, so I'm assuming it has the VF sized restrictor pill. Other mods are STI tmic Perrin inlet, afta maf Cobb SF intake Perrin lightweight pulley Invidia UP Invidia DP, Borla hush cbe When boost hits up between around 15-17lb, the turbo kind of "slips" and flutters, the boost needle just fluctuates back and forth, then boost seems to drop off and hold right around 1 mpa again. Boost seems a little slow to build, but when spooling seems to hold boost alright until right around 14 pounds or so. Cobb target boost is 17PSI. I have doublechecked all of my hose clamps and hoses, they all seem just fine, and worked fine with the td04. AP scan revealed no trouble codes. any suggestions? Last edited by bss; 2010-12-27 at 02:44 PM.