GTEASER Posted April 20, 2016 Share Posted April 20, 2016 (edited) It'll be interesting to see what, if any, differences there are between the GB DP and the one Swannee was using. Swannee's DP is coming my way in a few weeks. I plan to install the GB DP and see if I have any issues. If so, I will install Swannee's. If there is no issue with that one, then we have some ammo to go back to Nameless with to show that their change in design for the GB DP caused issues. Edited April 20, 2016 by GTEASER GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
GTEASER Posted April 20, 2016 Share Posted April 20, 2016 So can these ARP bolts be used in some other location (bolt on turbo, headers) or are they pretty much 40 bucks in the garbage? The Totally Stainless bolts actually give just a hair more clearance than the stock studs IIRC. GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
jackal8788 Posted April 20, 2016 Share Posted April 20, 2016 Didn't get a chance to pull a log for you guys last night. I did monitor target and actual boost this morning on my drive to work. Target is set to 18.5 psi and I was actually underboosting a bit, it was 50 degrees outside and I think the highest I saw was about 16.9 that wasn't a nice long pull but I remember when it was first tuned it could easily hit 20+ by about 5k. I'll keep watching it on my way home and try to see if I can get it to overboost again. What gear did you do the pull in? Your best chance of overboosting will be in higher gears. I wouldn't personally go WOT in 6th or probably even 5th at low RPM, but a 4th gear pull might get you to spike a little bit if you were doing your previous pull in a lower gear. VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
eckseleven Posted April 20, 2016 Author Share Posted April 20, 2016 The Totally Stainless bolts actually give just a hair more clearance than the stock studs IIRC. I was under the impression that the TS bolts could have been the source of my problems initially. The OEM studs have the shoulder area to help locate the whole DP assembly to the turbine housing and that shoulder area is just a tiny bit smaller than the TS bolts. Link to comment Share on other sites More sharing options...
Apexofthevortex Posted April 20, 2016 Share Posted April 20, 2016 What gear did you do the pull in? Your best chance of overboosting will be in higher gears. I wouldn't personally go WOT in 6th or probably even 5th at low RPM, but a 4th gear pull might get you to spike a little bit if you were doing your previous pull in a lower gear. Usually I do 3rd gear pulls when I'm trying to monitor. I think its creeps more when I get into boost quickly as oppose to rolling into it. I'll try 4th gear on the way home. Link to comment Share on other sites More sharing options...
GTEASER Posted April 20, 2016 Share Posted April 20, 2016 I was under the impression that the TS bolts could have been the source of my problems initially. The OEM studs have the shoulder area to help locate the whole DP assembly to the turbine housing and that shoulder area is just a tiny bit smaller than the TS bolts. I think you're right. Couldn't remember for sure. Maybe jojorios can sell them to someone with another brand of DP. GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
Apexofthevortex Posted April 20, 2016 Share Posted April 20, 2016 Looks like jack hit the nail on the head, I hit it in 4th and got up to 19.7 its 75 degrees outside. Definitely confirmed my theory that the faster I get into boost the more it creeps Link to comment Share on other sites More sharing options...
BBPeik Posted April 20, 2016 Share Posted April 20, 2016 I can take a pic of Swannee's when I get home if that would help anyone until he gets it up to GTEASER. Let me know. My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
Ellesedil Posted April 20, 2016 Share Posted April 20, 2016 Do we have any examples yet where porting the turbo actually fixed the creep issues with this downpipe? Link to comment Share on other sites More sharing options...
FLlegacy Posted April 20, 2016 Share Posted April 20, 2016 I think the only person with a ported waste-gate is smoovemove. But that is a 20g, right? Link to comment Share on other sites More sharing options...
jackal8788 Posted April 20, 2016 Share Posted April 20, 2016 I think the only person with a ported waste-gate is smoovemove. But that is a 20g, right? That it is. And it was ported when I owned it. VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
BBPeik Posted April 21, 2016 Share Posted April 21, 2016 Swannee's Downpipe http://i1378.photobucket.com/albums/ah113/BBPeik/20160420_175515_zpsnuyp226u.jpg My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
BBPeik Posted April 21, 2016 Share Posted April 21, 2016 I think the only person with a ported waste-gate is smoovemove. But that is a 20g, right? I am now the proud owner of a 20g with a ported wg as well. My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
FLlegacy Posted April 21, 2016 Share Posted April 21, 2016 ^^in that case did swannee overboost? Link to comment Share on other sites More sharing options...
BBPeik Posted April 21, 2016 Share Posted April 21, 2016 No He did not as far as I understand. My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
eckseleven Posted April 21, 2016 Author Share Posted April 21, 2016 Notice how the bypass for the wastegate doesn't merge at a 90 degree angle like the group buy version does? Hmm.. Link to comment Share on other sites More sharing options...
GTEASER Posted April 21, 2016 Share Posted April 21, 2016 Notice how the bypass for the wastegate doesn't merge at a 90 degree angle like the group buy version does? Hmm.. Yup. There's a merging bend with a smooth curve. GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
Starks Posted April 21, 2016 Share Posted April 21, 2016 Why did they change the design 2 additional times? Like the very first gen designs (what's on their site) look very different from what we ended up with. Sent from my SM-G935V using Tapatalk Link to comment Share on other sites More sharing options...
Swannee225 Posted April 21, 2016 Share Posted April 21, 2016 Found out I accidently unsubscribed from this post. When I installed the Dp for the first time I did not have any issues whatsoever. That was with McDowell stg 2 tuned. No over boost issues then. After my engine rebuild and BNR 20G with ported wastegate. I was having over boost issues. But they were not related to the Downpipe at all. The issue with mine was the actuator arm after the wastgate was hitting the heat shield on top of the turbo. I was concerned about the wastegate not opening due to clearance with the DP but that was not the case, as I took off the down pipe and hooked up an air compressor to the wastgate and physically saw the flap stay closed but the whole heatshield shifted when the air was applied. I marked where it needed to be cut and removed about a 2-3 inch section from the heatshield. After I installed it again. My overboost issues were gone.... I have the Original design for the downpipe. Not the Group buy one. And I'm also at elevation. About 3500ft. Link to comment Share on other sites More sharing options...
ripstik Posted April 21, 2016 Share Posted April 21, 2016 .... After my engine rebuild and BNR 20G with ported wastegate. I was having over boost issues. But they were not related to the Downpipe at all. The issue with mine was the actuator arm after the wastgate was hitting the heat shield on top of the turbo.... I marked where it needed to be cut and removed about a 2-3 inch section from the heatshield. After I installed it again. My overboost issues were gone.... SMOOVE this could be your fix Link to comment Share on other sites More sharing options...
FLlegacy Posted April 21, 2016 Share Posted April 21, 2016 Considering the size of the wastegate I wouldn't think a different bend in the tube would cause any issues especially with the size relative to the wastegate. Link to comment Share on other sites More sharing options...
GTEASER Posted April 21, 2016 Share Posted April 21, 2016 Considering the size of the wastegate I wouldn't think a different bend in the tube would cause any issues especially with the size relative to the wastegate. If the flow from the main pipe is diverting into the wastegate dump pipe it could be causing back pressure on the flapper. I could see that happening on the GB DP, not on the original design the Swannee has. On the other hand, the Nameless DP might just flow so much better than any other DP on the market (being that it completely separates turbine flow from WG dump) that it's just superior, and causing problems as a result. GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
Sarang Posted April 21, 2016 Share Posted April 21, 2016 That's what I was thinking. The size of the tube is much larger than the waste gate and it's pretty short. I just don't see it being the limiting factor. Besides, isn't the turbo spun mostly off of thermal expansion? That would mean you wouldn't need a real big leak to relieve it. Link to comment Share on other sites More sharing options...
FLlegacy Posted April 21, 2016 Share Posted April 21, 2016 If the flow from the main pipe is diverting into the wastegate dump pipe it could be causing back pressure on the flapper. I could see that happening on the GB DP, not on the original design the Swannee has. On the other hand, the Nameless DP might just flow so much better than any other DP on the market (being that it completely separates turbine flow from WG dump) that it's just superior, and causing problems as a result. If that were the case the more free flowing systems would have less of an issue because there would be less pressure in the main pipe to back feed the wastegate pipe. It is more likely the wastegate itself is not sufficiently sized to release the pressure. More back-pressure would cause greater over-boosting if that were the case. It would be nice to hear from Nameless on this thread, to see what their thoughts may be. Link to comment Share on other sites More sharing options...
BBPeik Posted April 21, 2016 Share Posted April 21, 2016 As much as it sucks to say it I think that this may be a flaw in our turbos. Sounds like as soon as we get exhaust that can flow freely enough the WG just is not able to slow down the turbine. Even in some cases it sounds like with a ported WG. Could be just a problem with the WG flow design. All I know is that it sounds like we just need to have a restriction in the exhaust somewhere to inhibit flow through the turbo a bit. My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
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