frank_ster Posted March 8, 2015 Share Posted March 8, 2015 Yea ring and pinion is the easy part. Its the freaking out tcu/ bcm / ecm after the fact that is the hard part Now that's thinking out of the boxer! fyi all 05 + legacy's have built in code reader Link to comment Share on other sites More sharing options...
fredrik94087 Posted March 9, 2015 Share Posted March 9, 2015 Yea ring and pinion is the easy part. Its the freaking out tcu/ bcm / ecm after the fact that is the hard part That is exactly it. No one knows for sure what will happened. I just customized an aftermarket TB from boomba for the STI and fit it to my 3.6R. Even the guys at boomba were a bit weary thinking that I would get codes or the butterfly valve would get stuck at WOT. I got it on and no codes, doesn't get stuck, works fine. I need to tune it to get the AFR back to where it needs to be, but other than that...no problems. Maybe it will be the same situation, but I'd have to go into it for a few thousand dollars and not a few hundred like the TB. I am not quite ready to trail blaze the ring and pinion. If you guys know any shop in the SF Bay Area, please PM me. Cheers! "It's within spec" - SOA "Depth is only shallowness viewed from the side." - Fredism "So, how much did it cost for your car to be undriveable ." - Stephen (very close friend) "You have done so much it would be stupid to go back." - Sunny of Guru Electronics 2018Q50RS | 2015WrxThread | Shrek Link to comment Share on other sites More sharing options...
frank_ster Posted March 10, 2015 Share Posted March 10, 2015 if you want to go aftermarket mega squirt and mega shift you golden. but thats a major commitment. Now that's thinking out of the boxer! fyi all 05 + legacy's have built in code reader Link to comment Share on other sites More sharing options...
fredrik94087 Posted March 10, 2015 Share Posted March 10, 2015 if you want to go aftermarket mega squirt and mega shift you golden. but thats a major commitment. Standalone ECU? "It's within spec" - SOA "Depth is only shallowness viewed from the side." - Fredism "So, how much did it cost for your car to be undriveable ." - Stephen (very close friend) "You have done so much it would be stupid to go back." - Sunny of Guru Electronics 2018Q50RS | 2015WrxThread | Shrek Link to comment Share on other sites More sharing options...
frank_ster Posted March 11, 2015 Share Posted March 11, 2015 yes Now that's thinking out of the boxer! fyi all 05 + legacy's have built in code reader Link to comment Share on other sites More sharing options...
fahr_side Posted March 11, 2015 Share Posted March 11, 2015 Yea ring and pinion is the easy part. Its the freaking out tcu/ bcm / ecm after the fact that is the hard part The ECU has tables for the gear determination which are easy to edit. The TCU though... you might have to go to the unit from the Tribeca or even the STi A-Line for that. 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...
frank_ster Posted March 11, 2015 Share Posted March 11, 2015 well even the abs is reporting speed back to the ecm. the gear tables in the ecm is just so the ecm knows what gear the manual box is in from my understanding. Now that's thinking out of the boxer! fyi all 05 + legacy's have built in code reader Link to comment Share on other sites More sharing options...
FLlegacy Posted March 11, 2015 Share Posted March 11, 2015 The ecu also needs to know what gears the 5eat is in for manual mode. Link to comment Share on other sites More sharing options...
frank_ster Posted March 11, 2015 Share Posted March 11, 2015 The ecu also needs to know what gears the 5eat is in for manual mode. well that is just for the per gear boost control, the ecm wont set a error saying wrong gear ratio, the tcu may say speed mismatch or something similar. Now that's thinking out of the boxer! fyi all 05 + legacy's have built in code reader Link to comment Share on other sites More sharing options...
FLlegacy Posted March 11, 2015 Share Posted March 11, 2015 But doesn't it use calculated ratio to determine the gear selection? Link to comment Share on other sites More sharing options...
frank_ster Posted March 12, 2015 Share Posted March 12, 2015 The tcm chooses gear and such the ecm just wants to know what gear its in The txm also talks to the ecm , so i think the gear speed tables are only used on mt cars Now that's thinking out of the boxer! fyi all 05 + legacy's have built in code reader Link to comment Share on other sites More sharing options...
FLlegacy Posted March 12, 2015 Share Posted March 12, 2015 So how does the ecm decide what gear the 5eat is in? By solenoids? Just seems if they built the capability into the ecm it would be easier to use it for both 5eat and 6spd rather than one ecm for the auto and one ecm for the 6 spd. But stranger things have happened. Link to comment Share on other sites More sharing options...
fahr_side Posted March 12, 2015 Share Posted March 12, 2015 (edited) The tcm chooses gear and such the ecm just wants to know what gear its in The txm also talks to the ecm , so i think the gear speed tables are only used on mt cars The values in those tables are different in AT and MT ROMs though, and between 5EAT models with different final drive ratios, like early/late LGT or LGT/OBXT. Frederick, if you want to know for sure if chicken or egg came first, change the values in your current table to those from the model with the final drive ratio you'd like to use, which I think is the Tribeca if you're going for shorter ratios (3.583?). Remember to compensate for the difference (if any) in tire height. If you don't know how to calculate the thresholds just let me know. Edited March 12, 2015 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...
fredrik94087 Posted March 12, 2015 Share Posted March 12, 2015 The values in those tables are different in AT and MT ROMs though, and between 5EAT models with different final drive ratios, like early/late LGT or LGT/OBXT. Frederick, if you want to know for sure if chicken or egg came first, change the values in your current table to those from the model with the final drive ratio you'd like to use, which I think is the Tribeca if you're going for shorter ratios (3.583?). Remember to compensate for the difference (if any) in tire height. If you don't know how to calculate the thresholds just let me know. Yikes...that would be for my tuner Rob at AMR. It is the 3.583. Are you saying, before I swap anything out, I can try to see if I can manipulate a table for final drive and tire height? I assume without going for a drive but to at least see if I can find them and change them? "It's within spec" - SOA "Depth is only shallowness viewed from the side." - Fredism "So, how much did it cost for your car to be undriveable ." - Stephen (very close friend) "You have done so much it would be stupid to go back." - Sunny of Guru Electronics 2018Q50RS | 2015WrxThread | Shrek Link to comment Share on other sites More sharing options...
fahr_side Posted March 12, 2015 Share Posted March 12, 2015 Yikes...that would be for my tuner Rob at AMR. It is the 3.583. Are you saying, before I swap anything out, I can try to see if I can manipulate a table for final drive and tire height? I assume without going for a drive but to at least see if I can find them and change them? If the table is defined you could try changing the values to see if that throws a code or causes the TCU to misbehave. I don't think anything will happen. The threshold values are right in the middle of the gears, so the ECU basically knows which gear you are in from seeing which pair of impossible numbers your tire revs vs. engine speed are sitting at. Being 10% off 'target' isn't going to make the ECU think you're in a different gear. There's a customer car I could try this on. I'll come back to this. 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...
fredrik94087 Posted March 12, 2015 Share Posted March 12, 2015 Thanks...and it is more like 15% "It's within spec" - SOA "Depth is only shallowness viewed from the side." - Fredism "So, how much did it cost for your car to be undriveable ." - Stephen (very close friend) "You have done so much it would be stupid to go back." - Sunny of Guru Electronics 2018Q50RS | 2015WrxThread | Shrek Link to comment Share on other sites More sharing options...
frank_ster Posted March 12, 2015 Share Posted March 12, 2015 So how does the ecm decide what gear the 5eat is in? By solenoids? Just seems if they built the capability into the ecm it would be easier to use it for both 5eat and 6spd rather than one ecm for the auto and one ecm for the 6 spd. But stranger things have happened. The trans mission is electronic it doesnt shift by its self what so ever. The tcu activates the solonoids in different sequence for each gear. But the trans has output soeed sensors for front and rear . They are before the diffs tho. So theoritically the tcu would be fine with a diff swap. The speedo inside the car uses both the trans output speed sensors and the abs sensors. When my output speed sensors broke the speedo was still working but to a slightly different value. You could just try setting the speed tables as suggested already. Or you could even put them to zero and see what that does i wouldn't think the ecm would even care. But that test would give us valueable info. But im sure there are a lot of differences between 05 and 2013 models Now that's thinking out of the boxer! fyi all 05 + legacy's have built in code reader Link to comment Share on other sites More sharing options...
king_mikey Posted March 29, 2015 Share Posted March 29, 2015 My brother has a 2006 lgt with 5spd MT with 77,000 miles and started having issues with shifting. Started to jerk in all RPM ranges but started with lower RPMs first. When driving it feels like driving a 4x4 with locking hubs and makes knocking noise. Tranny fluid smells burnt and is black. Any ideas what could be causing this?? Link to comment Share on other sites More sharing options...
FLlegacy Posted March 30, 2015 Share Posted March 30, 2015 Is it a manual or auto? This thread is for the 5eat automatic. There are threads for the manual trans as well. If it is the auto first thing I would do is get that fluid changed but really it's not sounding good. Link to comment Share on other sites More sharing options...
king_mikey Posted March 30, 2015 Share Posted March 30, 2015 (edited) Is it a manual or auto? This thread is for the 5eat automatic. There are threads for the manual trans as well. If it is the auto first thing I would do is get that fluid changed but really it's not sounding good. Sorry if I put it in the wrong thread but it's a 5 spd manual Edited March 30, 2015 by king_mikey Typo Link to comment Share on other sites More sharing options...
FLlegacy Posted March 30, 2015 Share Posted March 30, 2015 No problem to me you saw 5 spd. First I would get that old gear oil out and changed you will need to do this a few times before it is all better. At least two. If the trans is this neglected chances are the clutch may be too. So get the gear oil done and reassess what's going on. As for the binding it is common on cars that sit a lot. This may sound funny but try doing circles in a parking lot one way for a few minutes and then the other. That may free up the center diff if not you may need to take it to a good subie mechanic for a proper diagnosis. Link to comment Share on other sites More sharing options...
king_mikey Posted March 30, 2015 Share Posted March 30, 2015 No problem to me you saw 5 spd. First I would get that old gear oil out and changed you will need to do this a few times before it is all better. At least two. If the trans is this neglected chances are the clutch may be too. So get the gear oil done and reassess what's going on. As for the binding it is common on cars that sit a lot. This may sound funny but try doing circles in a parking lot one way for a few minutes and then the other. That may free up the center diff if not you may need to take it to a good subie mechanic for a proper diagnosis. Thank you Link to comment Share on other sites More sharing options...
frank_ster Posted March 30, 2015 Share Posted March 30, 2015 (edited) if you have 5 mt binding issues and knocking when turning your center diff is toast. its the viscous coupling, and it has its own special fluid inside. you cannot get new fluid. for a friend i took the center diff out and removed that fluid and all the insides of the viscous coupling , so its just open center diff, as it was old 96 legacy beater and he didn't want to spend money on it. if you want to fix it you need new center diff. http://legacygt.com/forums/showthread.php/2001-5-mt-legacy-center-diff-binding-very-badly-208004.html but try to post in the correct forum pages this page is for automatic trans specifically. Edited March 30, 2015 by frank_ster Now that's thinking out of the boxer! fyi all 05 + legacy's have built in code reader Link to comment Share on other sites More sharing options...
programador23 Posted April 8, 2015 Share Posted April 8, 2015 Hello i have a friend with a 05 Lgt 5EAT, his transmission just start to slip some months ago he bought another transmission but the new one keep acting strage, the vendor say him it is a 06 transmission and he need a 06 TCU, quiestions are: are 05 and 06 transmission really diferent? are 05 and 06 TCU pin compatible? Link to comment Share on other sites More sharing options...
frank_ster Posted April 8, 2015 Share Posted April 8, 2015 05-06 are different I dont know if the tcu plugs in. Only differences are the speed sensors What error code are you getting ? Somethin speed sensor? Now that's thinking out of the boxer! fyi all 05 + legacy's have built in code reader Link to comment Share on other sites More sharing options...
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