dgoodhue Posted January 20, 2017 Share Posted January 20, 2017 The graphs don't have the AFR scaling so it is hard to judge them, but the AFR ratio looks to be on the high side. My estimation look like its about 11.2-11.3:1 for most the RPM range. Another 0.5 leaner should add a noticeable amount of hp. Link to comment Share on other sites More sharing options...
FLlegacy Posted January 20, 2017 Share Posted January 20, 2017 Mine goes down to around 11.3 during wot. Sent from my SAMSUNG-SGH-I337 using Tapatalk Link to comment Share on other sites More sharing options...
dgoodhue Posted January 20, 2017 Share Posted January 20, 2017 Mine goes down to around 11.3 during wot. Sent from my SAMSUNG-SGH-I337 using Tapatalk Maybe I should not comment on AFR on a engine I don't own. I looked around at few dyno sheets around the forum and low 11 AFR seems normal for the 2.5 turbo motors. My truck has knock sensitive (crap) heads and most of us try to tune for what is usually considered a conservation 11.75:1. I know of a bunch of engines where the tuner aims for 12-12.25:1. It is a big problem for owners that use the local random tuner that doesn't have any experience with that engine to add too much timing and go too lean. Maybe Subaru 2.5 don't like the lean fuel mixtures either... Link to comment Share on other sites More sharing options...
FLlegacy Posted January 20, 2017 Share Posted January 20, 2017 Yeah I think given the ringland issues and leaning out of cylinder 4 the tuners are probably ultra conservative. Sent from my SAMSUNG-SGH-I337 using Tapatalk Link to comment Share on other sites More sharing options...
SJGT Posted January 20, 2017 Share Posted January 20, 2017 Yeah - cylinder 4 lagging Cyl 1 - 150psi Cyl 2 - 145psi Cyl 3 - 146psi Cyl 4 - 125psi Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
FLlegacy Posted January 21, 2017 Share Posted January 21, 2017 So when's the rebuild party? Link to comment Share on other sites More sharing options...
BBPeik Posted January 21, 2017 Share Posted January 21, 2017 I'm there. I have some friends in NJ. We can all go out and rebuild the motor. That is after S2's of course. My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
SJGT Posted January 23, 2017 Share Posted January 23, 2017 a couple logs I was able to get today - conditions aren't really great so I couldn't really get a good pull in, and looking lousy for next few days - heading to baltimore on Tuesday/Wednesday for work so maybe a couple highway pulls on my way down there - but either way something to chew on for a bit datalog1 - 3rd gear pull from 2500 to 6300rpms and let off - reached peak boost 16.9 in the 4800-5000rpm range datalog3 - 3rd gear pull from 2500, shifted into 4th at redline and just got on it a touch more from there datalog4 - 4th gear pull from 3400, let off it around 5600, hit 17.9 around 4800rpmdatalog1.csvdatalog3.csvdatalog4.csvdatalog5.csv Link to comment Share on other sites More sharing options...
SJGT Posted January 23, 2017 Share Posted January 23, 2017 So when's the rebuild party? Link to comment Share on other sites More sharing options...
FLlegacy Posted January 23, 2017 Share Posted January 23, 2017 a couple logs I was able to get today - conditions aren't really great so I couldn't really get a good pull in, and looking lousy for next few days - heading to baltimore on Tuesday/Wednesday for work so maybe a couple highway pulls on my way down there - but either way something to chew on for a bit datalog1 - 3rd gear pull from 2500 to 6300rpms and let off - reached peak boost 16.9 in the 4800-5000rpm range datalog3 - 3rd gear pull from 2500, shifted into 4th at redline and just got on it a touch more from there datalog4 - 4th gear pull from 3400, let off it around 5600, hit 17.9 around 4800rpm Are you using an aftermarket wastegate or the turbo wastegate? In your log3 you have 0 wgdc but your throttle position is all over the place and you are building boost. Link to comment Share on other sites More sharing options...
SJGT Posted January 23, 2017 Share Posted January 23, 2017 no aftermarket wastegate - wgdc is 0 across my logs Link to comment Share on other sites More sharing options...
FLlegacy Posted January 23, 2017 Share Posted January 23, 2017 no aftermarket wastegate - wgdc is 0 across my logs Was that intentional? Link to comment Share on other sites More sharing options...
eckseleven Posted January 23, 2017 Author Share Posted January 23, 2017 no aftermarket wastegate - wgdc is 0 across my logs So you are seeing 17-18 psi with 0 wgdc? That is good information. That's exactly the behavior I was getting with a 0 wgdc tune. In my early testing with the DP, the experts here and my tuner said I shouldn't see much more than ~11 psi with that tune yet I consistently would see much higher. To me, this is the proof that DP isn't functioning as promised. If the boost runs out of control with only spring pressure, how can it be expected to be in control in all driving conditions, temperatures, and elevations? Link to comment Share on other sites More sharing options...
SJGT Posted January 23, 2017 Share Posted January 23, 2017 So yeah set the AP to show wg max and wgdc during my trip to work today - zeroes whole trip - has to be intentional - Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
GTEASER Posted January 23, 2017 Share Posted January 23, 2017 Aaaannndddd.....your tuner didn't say anything to you? I wouldn't trust that dude farther than I can hock a loogie. 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...
jertfunk Posted January 23, 2017 Share Posted January 23, 2017 So yeah set the AP to show wg max and wgdc during my trip to work today - zeroes whole trip - has to be intentional - Sent from my iPhone using Tapatalk What's the outside temperature like where your at? Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
FLlegacy Posted January 23, 2017 Share Posted January 23, 2017 (edited) To me it looks like he opened the waste gate and then used the throttle to control boost. If that's the case you installed a bcs for nothing... Sent from my SAMSUNG-SM-G920A using Tapatalk Edited January 23, 2017 by FLlegacy Link to comment Share on other sites More sharing options...
SJGT Posted January 23, 2017 Share Posted January 23, 2017 What's the outside temperature like where your at? Sent from my iPhone using Tapatalk Been mild - prolly 40s/50s while driving Link to comment Share on other sites More sharing options...
GTEASER Posted January 23, 2017 Share Posted January 23, 2017 Yeah, not hitting peak boost until 4800 rpms is not right. Most tuners are tapering boost down by then. You should be stabbing 17psi minimum by 3500 rpms. 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...
mcg_ Posted January 23, 2017 Share Posted January 23, 2017 Aaaannndddd.....your tuner didn't say anything to you? I wouldn't trust that dude farther than I can hock a loogie. This. 1000 times this. Perhaps, he gave you alternative facts. Link to comment Share on other sites More sharing options...
BBPeik Posted January 23, 2017 Share Posted January 23, 2017 I just checked a bunch of my logs and I am hitting peak at 3800rpm. Mind you the 20g is a bit different, but if anything it would have a bit more lag than stock. My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
FLlegacy Posted January 23, 2017 Share Posted January 23, 2017 Go over to the power thread, the logs there show peak boost around 3500 rpm. And a pretty steep build up from 2.5k or so. Sent from my SAMSUNG-SM-G920A using Tapatalk Link to comment Share on other sites More sharing options...
SJGT Posted January 23, 2017 Share Posted January 23, 2017 (edited) alternative facts. I see what you did there - need some more truthiness in here Edited January 23, 2017 by SJGT Link to comment Share on other sites More sharing options...
SJGT Posted January 23, 2017 Share Posted January 23, 2017 Aaaannndddd.....your tuner didn't say anything to you? I wouldn't trust that dude farther than I can hock a loogie. And just to be transparent - I'm sure a quick read of my involvement in this forum it's pretty apparent I'm a serious noob here - I'm learning a ton as I go - really serious learning curve - I didn't exactly ask many questions either when I picked it up - now, that being said - for the price I paid I would have appreciated some 1:1 with the tuner to learn about what he saw and choices he made - that didn't happen either - so from here - we look at my logs - I ask questions - get some answers - and we keep learning - whole reason I kind of jumped headfirst into this was to add some more value to the forum when I didn't have my own knowledge yet to share - can at least use my experiences and risk appetite*** Link to comment Share on other sites More sharing options...
fahr_side Posted January 23, 2017 Share Posted January 23, 2017 (edited) Being 6psi over actuator spring pressure while at zero WGDC cannot be called boost control. It's also a bad idea to hold boost in check with throttle angle. This causes EGT to spike very high. Edited January 23, 2017 by fahr_side Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now