don7 Posted September 2, 2014 Share Posted September 2, 2014 Lets get that update maaaaannnnn Just wanted to share something that might be relevant to this thread. Replaced my MAF sensor today and while I was in there I pulled out my crank position sensor for shits and grins based on this thread: http://forums.nasioc.com/forums/showthread.php?t=2127497 Low and behold this is what mine looked like. I just wiped it off and have yet to drive it but I was surprised at how much dirt that had accumulated after 104k miles. Just a public service announcement... I'll follow up if there is any improvement or not. http://i266.photobucket.com/albums/ii273/themadtestpilot23/Mobile%20Uploads/image_zpsdedb6150.jpg Link to comment Share on other sites More sharing options...
RallyMachine Posted September 2, 2014 Author Share Posted September 2, 2014 Well I have some mixed results.... It's hard to say what is what since I also replaced my maf sensor at the same time. Overall the car feels a little bit smoother and bit less boggy. Unfortunately I'm still getting a hesitation/stutter in the same range... It might be interesting to check out the cam sensors to see if they are similarly dirty... Link to comment Share on other sites More sharing options...
RallyMachine Posted September 3, 2014 Author Share Posted September 3, 2014 Bump on this... Another thought I had, the stock map as well as my tuned map has the WGDC tables starting exactly at 2250 rpm (coincidence?). At anything over 17% applied throttle at 2250 there is loads of WG duty. Whether this is interpolated to lower RPM I'm not sure, but maybe it's the WG cutting in abruptly at this RPM causing a momentary hesitation until it can be smoothed out to the next RPM row?? Link to comment Share on other sites More sharing options...
covertrussian Posted September 3, 2014 Share Posted September 3, 2014 Here is my catless downpipe but stock boost levels WDC tables that I currently run. http://i160.photobucket.com/albums/t188/covertrussian/Cars/05%20LGT/ECU/Downpipe/DPStockBoost.png~original 05 LGT 16G 14psi 290whp/30mpg (SOLD) 12 OBP Stock 130whp/27mpg@87 Oct 00 G20t GT28r 10psi 250whp/36mpg 22 Ascent STOCK Link to comment Share on other sites More sharing options...
RallyMachine Posted September 3, 2014 Author Share Posted September 3, 2014 So these are not stock WGDC tables, correct? The stock rom ones I have look pretty different especially in the 2250 row... Are you on stock boost controller? Link to comment Share on other sites More sharing options...
covertrussian Posted September 3, 2014 Share Posted September 3, 2014 These are my WGDC tables post STG2 downpipe install. Stock turbo, boost controller etc. All I did was reduce the WGDC table by certain % until I reached the same boost levels I was hitting stock. 05 LGT 16G 14psi 290whp/30mpg (SOLD) 12 OBP Stock 130whp/27mpg@87 Oct 00 G20t GT28r 10psi 250whp/36mpg 22 Ascent STOCK Link to comment Share on other sites More sharing options...
AMileHighLGT Posted September 3, 2014 Share Posted September 3, 2014 IIRC i read something a few months back about the stumble being fuel line related, and that there is a company that makes a kit to extend the fuel lines from the strut tower to the intake manifold.. Going to try and find that post. Link to comment Share on other sites More sharing options...
RallyMachine Posted September 3, 2014 Author Share Posted September 3, 2014 From what I've read people have replaced that fuel line and even added an aftermarket FPR and there was still no improvement... So russian, did your stock tables have the 90% WGDC in the 2250 row? Link to comment Share on other sites More sharing options...
AMileHighLGT Posted September 3, 2014 Share Posted September 3, 2014 Alright. I'll stop searching then. Link to comment Share on other sites More sharing options...
covertrussian Posted September 3, 2014 Share Posted September 3, 2014 I think I know what thread you are talking about, that issue was related to lean spots. Where people are saying the possible reason for random leanness was not enough fuel due to no fuel filter in the engine bay, which conveniently also doubles as a fuel storage container before pump kicks up pressure. From what I've read people have replaced that fuel line and even added an aftermarket FPR and there was still no improvement... So russian, did your stock tables have the 90% WGDC in the 2250 row? Yup, here is the stock WGDC table... http://i160.photobucket.com/albums/t188/covertrussian/Cars/05%20LGT/ECU/Downpipe/05LGTStockWGDC.png~original 05 LGT 16G 14psi 290whp/30mpg (SOLD) 12 OBP Stock 130whp/27mpg@87 Oct 00 G20t GT28r 10psi 250whp/36mpg 22 Ascent STOCK Link to comment Share on other sites More sharing options...
RallyMachine Posted September 3, 2014 Author Share Posted September 3, 2014 Maybe it's just a hunch but it seems kind of weird to run 90% WGDC in that one row only, especially at low throttle angles. I think I am running like 50-something percent and them 30-something at 2500 with an ebcs... Link to comment Share on other sites More sharing options...
covertrussian Posted September 3, 2014 Share Posted September 3, 2014 Maybe it's just a hunch but it seems kind of weird to run 90% WGDC in that one row only, especially at low throttle angles. I think I am running like 50-something percent and them 30-something at 2500 with an ebcs... That's Subaru's tuning magic. Now keep in mind it will interpolate between 0 rpm and 2250. But since there is no lower RPM column I'm not sure if it will interpolate from 0 or if it starts right at 90% for even 700rpm . Either way I think this way of tuning is stupid, but amongst other things (DBW map), Subaru did this to make the car feel peppier off the line. 05 LGT 16G 14psi 290whp/30mpg (SOLD) 12 OBP Stock 130whp/27mpg@87 Oct 00 G20t GT28r 10psi 250whp/36mpg 22 Ascent STOCK Link to comment Share on other sites More sharing options...
RallyMachine Posted September 3, 2014 Author Share Posted September 3, 2014 Yeah I thought about the interpolation to zero as well... But the way I see it the stumble could be either the ecu approaching the 90% WGDC at 2250 rpm OR it could be the sharp decrease in WGDC after that cell is reached... Not sure but I might give it a try soon Link to comment Share on other sites More sharing options...
covertrussian Posted September 3, 2014 Share Posted September 3, 2014 Yeah definitely try a smoother one then, I would do 60% on the 2250 row. I personally will probably go through and remap the RPM fields when I do a big tune overhaul, for now trying to keep as much stock as possible for testing . 05 LGT 16G 14psi 290whp/30mpg (SOLD) 12 OBP Stock 130whp/27mpg@87 Oct 00 G20t GT28r 10psi 250whp/36mpg 22 Ascent STOCK Link to comment Share on other sites More sharing options...
covertrussian Posted September 14, 2014 Share Posted September 14, 2014 Just found this. Verify your tables for big timing disparities. 05 LGT 16G 14psi 290whp/30mpg (SOLD) 12 OBP Stock 130whp/27mpg@87 Oct 00 G20t GT28r 10psi 250whp/36mpg 22 Ascent STOCK Link to comment Share on other sites More sharing options...
RallyMachine Posted September 15, 2014 Author Share Posted September 15, 2014 Hmmm might have to try that out... Link to comment Share on other sites More sharing options...
covertrussian Posted September 16, 2014 Share Posted September 16, 2014 Hmmm might have to try that out... Also try adding and an inline filter or extending the fuel lines. I didn't have the stumble, but I noticed the doesn't lean out as much when you tip in the throttle. 05 LGT 16G 14psi 290whp/30mpg (SOLD) 12 OBP Stock 130whp/27mpg@87 Oct 00 G20t GT28r 10psi 250whp/36mpg 22 Ascent STOCK Link to comment Share on other sites More sharing options...
RallyMachine Posted September 16, 2014 Author Share Posted September 16, 2014 Did you have to modify your MP load comp tables at all? Link to comment Share on other sites More sharing options...
covertrussian Posted September 16, 2014 Share Posted September 16, 2014 Did not touch them at all. But I am also on stock injectors and pump. 05 LGT 16G 14psi 290whp/30mpg (SOLD) 12 OBP Stock 130whp/27mpg@87 Oct 00 G20t GT28r 10psi 250whp/36mpg 22 Ascent STOCK Link to comment Share on other sites More sharing options...
chato Posted September 17, 2014 Share Posted September 17, 2014 I had an inline filter and extended line, didn't cure the stumble. Link to comment Share on other sites More sharing options...
covertrussian Posted September 17, 2014 Share Posted September 17, 2014 I wonder if I'm going to see what you guys are experiencing once I switch out the FP to DW65c. I think I did have some stumbling before, but after fixing CL to OL delay, and removing timing compensation it's been fine. 05 LGT 16G 14psi 290whp/30mpg (SOLD) 12 OBP Stock 130whp/27mpg@87 Oct 00 G20t GT28r 10psi 250whp/36mpg 22 Ascent STOCK Link to comment Share on other sites More sharing options...
chato Posted September 17, 2014 Share Posted September 17, 2014 the dw65c mostly fixed it for me. Link to comment Share on other sites More sharing options...
RallyMachine Posted September 23, 2014 Author Share Posted September 23, 2014 I wonder if I'm going to see what you guys are experiencing once I switch out the FP to DW65c. I think I did have some stumbling before, but after fixing CL to OL delay, and removing timing compensation it's been fine. Are you talking about the per cylinder timing compensation? I am still running some on cylinders 2 and 4 but it looks like my tuner reduced it to ~1 degree or less... Link to comment Share on other sites More sharing options...
covertrussian Posted September 23, 2014 Share Posted September 23, 2014 Correct, where it adds 2* for 2 & 4. The reason your tuner left some timing there is because knock sensor is right over #4, that way it knocks first and starts retarding timing for all cylinders. I am playing with Closed loop to open loop delay, I enabled the stock values. Holly crap the major stumble is back. Watching the wideband it stumbles because it's at 12psi and has 14:1 AFR's, then it stumbles again when it hits 10.9:1 AFR after it finally goes into open loop. 05 LGT 16G 14psi 290whp/30mpg (SOLD) 12 OBP Stock 130whp/27mpg@87 Oct 00 G20t GT28r 10psi 250whp/36mpg 22 Ascent STOCK Link to comment Share on other sites More sharing options...
covertrussian Posted October 6, 2014 Share Posted October 6, 2014 I think I've been able to replicate a sort of a stumble. It's based on wastegate duty cycle tables I think. While driving and logging, I would see my WGDC go from 0-11, and then it instantly jumps to 40 and the power difference would cause a stumble/car surge of sort. 05 LGT 16G 14psi 290whp/30mpg (SOLD) 12 OBP Stock 130whp/27mpg@87 Oct 00 G20t GT28r 10psi 250whp/36mpg 22 Ascent STOCK Link to comment Share on other sites More sharing options...
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