jackal8788 Posted November 12, 2015 Author Share Posted November 12, 2015 I just checked the Subaru Monitors in from Cobb and if I'm reading it correctly, the 'Ignition Timing' parameter that I logged should be the total timing applied. If that's true, then its back to the drawing board. VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
Perscitus Posted November 12, 2015 Share Posted November 12, 2015 Yup - Ignition Timing will be 'Total Timing' (all additives, knock control and compensations, etc.) You should also be able to find and log: Learned Timing, Learned Timing Correction. Not sure how they would help though. The issue you're having, especially knowing everything we now know - is very odd. Link to comment Share on other sites More sharing options...
jackal8788 Posted November 12, 2015 Author Share Posted November 12, 2015 .... The issue you're having, especially knowing everything we now know - is very odd. Tell me about it. I even posted in the 4th gen forum to see if any other thoughts surfaced. If the TGVs don't fix it (which I'm feeling will be the case), I don't really have a direction to go after that.... VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
Apexofthevortex Posted November 12, 2015 Share Posted November 12, 2015 Don't know if anyone has said this, but is it possible that the ECU itself could be on its way out? Link to comment Share on other sites More sharing options...
FLlegacy Posted November 12, 2015 Share Posted November 12, 2015 I would think if it were the ecu the symptoms would show up in the timing, throttle, or many other sensor inputs. According to Jackal's logs everything appears to be responding as it should except the power. Sent from my SAMSUNG-SGH-I337 using Tapatalk Link to comment Share on other sites More sharing options...
LatentWagen Posted November 12, 2015 Share Posted November 12, 2015 That's the thing. The power is there, according to airflow. VD does not match airflow, so we have to find out why. The only suspect I can think of is something after the engine... LW's spec. B / YT / IG Link to comment Share on other sites More sharing options...
s2baru Posted November 12, 2015 Share Posted November 12, 2015 Has a girl driven it recently? Link to comment Share on other sites More sharing options...
jackal8788 Posted November 12, 2015 Author Share Posted November 12, 2015 No, but my hair is getting pretty long.... VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
BBPeik Posted November 13, 2015 Share Posted November 13, 2015 Any chance the maf could be giving false readings? My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
BBPeik Posted November 13, 2015 Share Posted November 13, 2015 or map? My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
brandon.mol Posted November 13, 2015 Share Posted November 13, 2015 What about a binding or otherwise faulty Viscous Coupling. If that's even possible. Or what about a bad ABS wheel sensor making your stability control intervene during normal acceleration. Try turning off stability and traction control and or unplug wheel speed sensors. Link to comment Share on other sites More sharing options...
jackal8788 Posted November 13, 2015 Author Share Posted November 13, 2015 Any chance the maf could be giving false readings? or map? I talked with my tuner about it and he doesn't think it is likely although this is also what Cobb suggested. He has another MAF so we will likely try that after I get the TGVs deleted. VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
jackal8788 Posted November 13, 2015 Author Share Posted November 13, 2015 What about a binding or otherwise faulty Viscous Coupling. If that's even possible. Or what about a bad ABS wheel sensor making your stability control intervene during normal acceleration. Try turning off stability and traction control and or unplug wheel speed sensors. I will also check this when I get it back together. From what I remember when the stability control was active, it seemed fairly noticeable that the system was intervening and I haven't observed anything like that under acceleration. The car just has kind of a 'hollow' feel. The exhaust note is there but it just doesn't have any push behind it. VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
GTEASER Posted November 13, 2015 Share Posted November 13, 2015 Maybe it's time to do a hot engine compression test. And take an oil sample to send to Blackstone to look for fuel in the oil. 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 November 13, 2015 Author Share Posted November 13, 2015 Maybe it's time to do a hot engine compression test. And take an oil sample to send to Blackstone to look for fuel in the oil. That is exactly what I'm planning. I really need to see numbers that can be compared more easily to what people can relate to here. That will immediately follow my drive after the TGV delete and maybe provide some insight. Good call on the oil analysis too. Unfortunately, I was changing it at the same time that I did the plugs and initial compression test.... VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
LatentWagen Posted November 13, 2015 Share Posted November 13, 2015 At the very least, you're getting tons of practice doing spark plug jobs. You should start timing yourself Still playing devil's advocate here about the drivetrain... have you had the car on a lift, with wheels on, to go through the gears a bit? LW's spec. B / YT / IG Link to comment Share on other sites More sharing options...
brandon.mol Posted November 13, 2015 Share Posted November 13, 2015 The car just has kind of a 'hollow' feel. The exhaust note is there but it just doesn't have any push behind it. Exactly. Say.. in theory if you removed one of your axles. That non-existent axel would receive all the power on that differential, however your VC would be working overtime to try and put half of it to the other end of the car. You would probably lose about 60+ percent of the "go" and bake the shite out of the VC fluid. It would be like riding the clutch but without the smell. Obviously you are not missing an axle, but something internally broken or slipping in the center diff.. dunno.. just theorizing. Maybe someone with experience breaking a half-shaft would know better what that feels like. Maybe the VC LSD wouldn't hold that well.. I have no idea. Regarding wheel sensors - I bring that up because it would only affect you on acceleration if the traction control was kicking in especially just modestly, since that is throttle modulated in combination with braking. These are my theories down the logic stream of "It's not the engine, it's something after the engine". Link to comment Share on other sites More sharing options...
jackal8788 Posted November 13, 2015 Author Share Posted November 13, 2015 ^ That's a really interesting point. I have no idea either what it would feel like or how the car would respond. It seems as smooth as it always has but maybe there wouldn't be any noticeable roughness if something was broken or slipping.... Thoughts from anyone who has had a broken axle or maybe something less major that might still cause a perceived loss of power? VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
BBPeik Posted November 13, 2015 Share Posted November 13, 2015 Pull the rear driveshaft and take it for a spin. It will be messy, but would diag the problem. My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
FLlegacy Posted November 13, 2015 Share Posted November 13, 2015 (edited) You know I remember reading a post about a guy with a 3.6 outback or tribeca that had a rear shaft not seated correctly and it would act like it had no power. I will try to find the thread. Edit although I am pretty sure the ecm would read this as a spinning wheel and kill power while flashing the tc light at you. Edited November 13, 2015 by FLlegacy Link to comment Share on other sites More sharing options...
brandon.mol Posted November 14, 2015 Share Posted November 14, 2015 (edited) You know I remember reading a post about a guy with a 3.6 outback or tribeca that had a rear shaft not seated correctly and it would act like it had no power. I will try to find the thread. Edit although I am pretty sure the ecm would read this as a spinning wheel and kill power while flashing the tc light at you. The ECU wouldn't have a clue. The wheel is still on the ground and turning the proper speed. The ECU doesn't do anything about the relative wheel speed compared to the output shaft speed, only relative to each other. If this is in fact the case, then your speedo would be off compared to actual vehicle speed. Edit, or maybe not. Depends on whether the speedo sending unit is on the front or rear output shaft or mechanically before the center diff. Edited November 14, 2015 by brandon.mol Link to comment Share on other sites More sharing options...
FLlegacy Posted November 14, 2015 Share Posted November 14, 2015 You are correct I forgot about the tone ring being on the hub. this is something worth checking out. Time to crawl under the car and pull on the shafts to be sure they are all seated properly. Link to comment Share on other sites More sharing options...
jackal8788 Posted November 14, 2015 Author Share Posted November 14, 2015 If there was any kind of issue or overload placed on the VC, would I see behavior similar to a slipping clutch (RPMS climbing without a direct response in velocity)? VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
brandon.mol Posted November 14, 2015 Share Posted November 14, 2015 If it was slipping due to a severed torque path, yes, likely. If something was binding then no. It might not be so obvious though because if its really linear you may not be able to tell. Sent from my Nexus 4 using Tapatalk Link to comment Share on other sites More sharing options...
FLlegacy Posted November 14, 2015 Share Posted November 14, 2015 Is there a way you can test having power to all 4 wheels? Sand, snow or something like that. Sent from my SAMSUNG-SGH-I337 using Tapatalk Link to comment Share on other sites More sharing options...
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