jeffy2.5xt Posted January 28, 2014 Share Posted January 28, 2014 i asked about the tune. he gave a vague reply, but yes who did he tune and how did they not notice something like this? i was also wondering how he was determining mileage? have you actually done the math yourself or just trusting the display? wonder if injectors were replaced with incorrect units to cut costs again. slim chance most likely but something to think about. as far as it goes now, id say find a new tuner and explain in detail your concerns and let them dig into the detail investigations. Link to comment Share on other sites More sharing options...
rob-2 Posted January 28, 2014 Share Posted January 28, 2014 Wouldn't it be funny if it had bigger injectors on it prior and the car was returned back to stock but they never reprogrammed the MPG back to stock? It's got to be something odd like that or you're tune is so bad it's just pissing fuel into the cyl. Link to comment Share on other sites More sharing options...
mwiener2 Posted January 28, 2014 Share Posted January 28, 2014 If you change injectors, your MPG display is wrong. It cannot be recalibrated. My Mods List (Updated 8/22/17) 2005 Outback FMT Running on Electrons Link to comment Share on other sites More sharing options...
apexi Posted January 28, 2014 Share Posted January 28, 2014 Obviously he just got a cheap MAF so I'd rather replace it with an OEM one. How much should I expect to pay for one? I'm seeing them anywhere from $170 to $350 which sounds like a little much. It looks like fred beans wants $142, IF 22680AA31A is the correct part number. Link to comment Share on other sites More sharing options...
adj789 Posted January 29, 2014 Author Share Posted January 29, 2014 i asked about the tune. he gave a vague reply, but yes who did he tune and how did they not notice something like this? i was also wondering how he was determining mileage? have you actually done the math yourself or just trusting the display? wonder if injectors were replaced with incorrect units to cut costs again. slim chance most likely but something to think about. as far as it goes now, id say find a new tuner and explain in detail your concerns and let them dig into the detail investigations. Right I told them before I got it tuned I was having really bad MPG, it was between 12-14 and yes I did the math, I was watching my fuel consumtion religiously and it was 1 under what the readout was saying so pretty accurate. I just filled up Sunday so I'll wait until the tank is empty to do the number again. I could even watch the gauge drop as I went back and forth to work (just a few miles). I'm going to replace the MAF first and if that doesn't help I'll get a cable. Link to comment Share on other sites More sharing options...
Burock Posted January 29, 2014 Share Posted January 29, 2014 I just cleaned my MAF with the CRC MAF cleaner over the weekend and gas mileage went from 17mpg to 19mpg. I think it had salt spray on it from the unrelenting salt they've been dumping on the highways this winter. May want to try cleaning the MAF before tossing it. Link to comment Share on other sites More sharing options...
ehsnils Posted January 29, 2014 Share Posted January 29, 2014 If not MAF, then O2 sensor or knock sensor giving false data. A data log would be great input for those of us that has an idea of what to suggest next. Link to comment Share on other sites More sharing options...
jeffy2.5xt Posted January 29, 2014 Share Posted January 29, 2014 indeed, logs will be most beneficial at this point. replacing MAF with a factory unit is just a good peace of mind that i would not feel upset paying a few bucks for. Link to comment Share on other sites More sharing options...
lee07 Posted January 29, 2014 Share Posted January 29, 2014 Log it and do a compression test first before replacing random parts Link to comment Share on other sites More sharing options...
BoozeRS05 Posted January 29, 2014 Share Posted January 29, 2014 If you change injectors, your MPG display is wrong. It cannot be recalibrated. I read today that Cobb very recently released some new software that will allow you to dial in an accurate MPG readout even with bigger injectors when using their ProTuner software. EB's Subaru journal - 2005 LegacyGT Wagon & 2014 Forester FB25 (2008 specB - RIP) IG@legacygtliving Link to comment Share on other sites More sharing options...
mwiener2 Posted January 30, 2014 Share Posted January 30, 2014 My Mods List (Updated 8/22/17) 2005 Outback FMT Running on Electrons Link to comment Share on other sites More sharing options...
zanzabar Posted January 30, 2014 Share Posted January 30, 2014 you can change it with ecutek and rom raider as well. (or that is what tuners have told me when i asked.) i think it is the fuel conservation rate that it calculates it from. Link to comment Share on other sites More sharing options...
mwiener2 Posted January 30, 2014 Share Posted January 30, 2014 It's been about 4-5 years since I re-explored this. But back then, it wasn't possible / worth the effort. 5 hours of tunning starting from scratch got the MPG within 2-3mpg, but the tune was crap to get it there so we dumped it and started over without trying to get the MPG to display right. My Mods List (Updated 8/22/17) 2005 Outback FMT Running on Electrons Link to comment Share on other sites More sharing options...
adj789 Posted January 30, 2014 Author Share Posted January 30, 2014 It's been insane around Atlanta the last few days, my car held up fine though and was giving people rides yesterday. I've been driving slow. I filled up Sunday, reset my trip meter and I'm at half a tank now, I've gone 80 miles. At 7.5gal in 80 miles is 10.6mpg Gonna order a new MAF tomorrow. Link to comment Share on other sites More sharing options...
covertrussian Posted January 30, 2014 Share Posted January 30, 2014 Try this out mwiener2: http://www.romraider.com/forum/viewtopic.php?f=34&t=9530 i had a pretty noticeable jump in mpg after PCV replacement. but I was nowhere near 13. I'm about to do mine, makes me forgive Subaru for making it so painful if there is such gains...! 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...
adj789 Posted February 3, 2014 Author Share Posted February 3, 2014 MAF should be here soon, do I have to tune it again? (Please say no.) Link to comment Share on other sites More sharing options...
Max Capacity Posted February 3, 2014 Share Posted February 3, 2014 Ok, I'll say no. But you are correct, you don't need a tune for it. Next time you want or need tuning, look up my Tuner, Mike Kinsman, of www.tuningalliance.com he's really that good. After you install the MAF, if you reset the ECU, which could be a good idea, or just start it and see how it runs. If you reset the ECU, you should drive it after you start it. or at least rev the engine a few times (2000-3000rpm) and let it relearn idle. Driving it is better then not. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
adj789 Posted February 7, 2014 Author Share Posted February 7, 2014 Put the new MAF in and gave it a spirited drive around town. The shaking is gone at idle. I watched the live MPG readout and it seemed to jump around anywhere from 18 to 33 but I'll give it a few days to get a better idea of what my MPGs are now, it seems to be better. Link to comment Share on other sites More sharing options...
adj789 Posted February 18, 2014 Author Share Posted February 18, 2014 The shaking is back and it says I'm averaging 13MPG. I'm gonna get a cable and data log it but I see there's some issue with the chipset in the cables, I have 2 saved in my bookmarks [ame=http://www.amazon.com/BestDealUSA-OBD-II-2-409-1-Cable-VAG-COM/dp/B008HO23OC/?tag=vglnkc6475-20]Amazon.com: DHSHOP USB OBD-II-2 KKL 409.1 OBD2 Cable VAG-COM for VW/AUDI: Car Electronics[/ame] and http://www.ebay.ca/itm/USB-KKL-VAGCOM-409-VAG-COM-409-1-USB-Port-Cable-with-FT232BL-Chip-Black-HOT-/221308400341?ssPageName=ADME:L:OC:CA:3160&clk_rvr_id=578106807137 Do I need to get the Ebay one over the Amazon one? Link to comment Share on other sites More sharing options...
rob-2 Posted February 18, 2014 Share Posted February 18, 2014 What are your compression numbers? Skip the cable and go right to the source. Link to comment Share on other sites More sharing options...
adj789 Posted February 18, 2014 Author Share Posted February 18, 2014 not sure, how can I find out? Link to comment Share on other sites More sharing options...
rob-2 Posted February 18, 2014 Share Posted February 18, 2014 not sure, how can I find out? A compression and leak down test. You can buy it yourself and to it, or pay a shop about $100-140 to do the testing for you. Link to comment Share on other sites More sharing options...
covertrussian Posted February 18, 2014 Share Posted February 18, 2014 Compression test involves warming the engine up, removing all 4 spark plugs, inserting a compression tester ($50) into one cylinder, press the throttle all the way down, and crank it 5-10 times. See how high that cylinder got, write it down, go to next cylinder rinse repeat. Btw I replaced my PCV valve, mine was kind of nasty and stuck a little. Didn't really improve my gas mileage though. http://images.rvsmods.com/var/albums/Cars/LGT/Engine/General/PCV-Valve/CIMG0486.JPG?m=1391352001 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...
MrTris Posted February 18, 2014 Share Posted February 18, 2014 The shaking is back and it says I'm averaging 13MPG. How's your O2 sensor(s)? Mine shakes quite a bit and my mileage is shit, but that's also because my O2 isn't sending a proper signal (Have CEL, though), so I'm sure it's not fueling right. (Read: dumping fuel) I'd seriously consider investing in a Cobb AP if you haven't already. You're clearly gonna dump more money into the car anyway -- You can find 'em used on CL, or new from Cobb for about $650. And having the ability to base tune, plus pull codes and run multiple maps -- it's the best money you can spend on your car. Link to comment Share on other sites More sharing options...
rob-2 Posted February 18, 2014 Share Posted February 18, 2014 Compression test involves warming the engine up, removing all 4 spark plugs, inserting a compression tester ($50) into one cylinder, press the throttle all the way down, and crank it 5-10 times. See how high that cylinder got, write it down, go to next cylinder rinse repeat. Btw I replaced my PCV valve, mine was kind of nasty and stuck a little. Didn't really improve my gas mileage though. http://images.rvsmods.com/var/albums/Cars/LGT/Engine/General/PCV-Valve/CIMG0486.JPG?m=1391352001 It shouldn't improve MPG. It might cut down on oil use if stuck. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.