GTEASER Posted August 16, 2016 Share Posted August 16, 2016 Or...couldn't we ditch the DCCD if were didn't want to bother with it and instead use our current center diff setup? 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...
BBPeik Posted August 16, 2016 Share Posted August 16, 2016 ^^^That would be great if we could, but would our CD fit in the STI housing? Its a lot of maybes. I would love to try it. Just need to get an STI trans. Our center diff is a great simple design. Of course how cool would it be to have SI Drive down by the cup holder. My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
Rutchard Posted August 16, 2016 Share Posted August 16, 2016 Yeah, there are aftermarket DCCD controllers. That would probably be a lot easier than trying to jam our center diff in there. SI drive is a moot point for the transmission. That just controls the throttle/engine maps, doesn't really do much for the transmission afaik... Mounting the trans and getting the shifter arm to line up are going to be the toughest parts of the swap. The rest isn't going to be a cakewalk compared to that. Link to comment Share on other sites More sharing options...
BBPeik Posted August 16, 2016 Share Posted August 16, 2016 I love how you have all of us talking about this. We all work on cars a lot and every one of us has a different idea of what the hard part will be. We need to all meet up and do the transmission swap . The power of many minds could conquer the dreaded STI swap. My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
FLlegacy Posted August 16, 2016 Share Posted August 16, 2016 With good planning and understanding there is no need to dread it, I would be excited to do one. Or maybe excited to be able to do one lol. Sent from my SAMSUNG-SGH-I337 using Tapatalk Link to comment Share on other sites More sharing options...
NVAKeith Posted August 16, 2016 Share Posted August 16, 2016 ^^^That would be great if we could, but would our CD fit in the STI housing?... IIRC, Spec.b had the STI 6MT without the DCCD. Using the center diff from that might simplify things. Link to comment Share on other sites More sharing options...
cww516 Posted August 16, 2016 Share Posted August 16, 2016 I mean, if you're going to that much effort to swap the transmission, you may as well go ahead and grab the standalone DCCD controller. You know, for a more robust center diff for doing doriftos in snow-covered parking lots. Go big or go home, right? Meanwhile, OP is silently shaking his head, wondering why the hell he asked us for advice... Link to comment Share on other sites More sharing options...
leighos Posted August 16, 2016 Share Posted August 16, 2016 Also, does anyone know if the transmission for the diesel EE20 the same as the 6MT on the GT's (http://www.boxeer.com/ee20_parts)? The 6MT for the EE20 has completely different gear ratios that are suited to the much lower RPM of the diesel engine. Sent from my ZUK Z1 using Tapatalk Link to comment Share on other sites More sharing options...
BBPeik Posted August 16, 2016 Share Posted August 16, 2016 meanwhile, op is silently shaking his head, wondering why the hell he asked us for advice... rofl!!! My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
mke LGT Posted August 17, 2016 Author Share Posted August 17, 2016 Yea no one really answered my question. But if you're all willing to come to Wisco we can attack an STI driveline swap on my desperate dummy car! Link to comment Share on other sites More sharing options...
FLlegacy Posted August 17, 2016 Share Posted August 17, 2016 The diesel version is just as strong (read "weak") as what we have now, might as well use a replacement or rebuild. There are only two transmissions I would bill as stronger, the 5eat (iffy) and the STI 6mt. Maybe arguably the 4eat could be built stronger, but still 4 gears wont cut it. Link to comment Share on other sites More sharing options...
FLlegacy Posted August 17, 2016 Share Posted August 17, 2016 The 6MT for the EE20 has completely different gear ratios that are suited to the much lower RPM of the diesel engine. Sent from my ZUK Z1 using Tapatalk Not completely different diesel: 3.454, 1.750, 1.062, 0.785, 0.634, 0.557, 3.636 fd 4.444 legacy: 3.454, 1.947, 1.296, 0.972, 0.780, 0.666, 3.636 fd 4.111 n/a leg: 3.454, 1.947, 1.296, 0.972, 0.825, 0.695, 3.636 I would bet with the higher final drive the diesel transmission would make a great cruiser and probably be a bit quicker to 60 with a longer 2nd gear. Link to comment Share on other sites More sharing options...
mke LGT Posted August 17, 2016 Author Share Posted August 17, 2016 So I'm currently planning on ordering a used tranny off ebay for just over a grand. Trying to determine if the 2.5i will in fact work fine. I know it won't be any stronger. Does anyone know how the transfer ratios compare? I see that the 2.5i and GT both have the the same rear diff ratio, but the GT diff is nearly twice as much. I'm not converting to AT. Planning on getting mine back on the road ASAP and tearing open the blown tranny to build up with straight cuts 1, 2 and maybe 3 and upgrade with billet shift works and whatever other goodies I can. Link to comment Share on other sites More sharing options...
FLlegacy Posted August 17, 2016 Share Posted August 17, 2016 The final drive ratio is the same for all legacy models, so be sure it is a legacy not an outback which has a 4.444 compared to the legacy 4.111. Get a hold of acumenhokie and see if his shop can replicate those blast plates otherwise you are just going to blow a tranny with more expensive gears in it. Link to comment Share on other sites More sharing options...
cww516 Posted August 17, 2016 Share Posted August 17, 2016 Looking at the vacation pics, the front and rear diffs are both 4.111 on the Legacy 2.5i (they're 4.444 on the Outback), transfer ratio 1.000 across the board. Far as I can tell, the only difference between the 2.5i and GT transmissions is the 5th and 6th gear ratios, everything else looks to be the same. Let me know if you need a copy of the vacation pics, I might know a guy... Link to comment Share on other sites More sharing options...
dgoodhue Posted August 17, 2016 Share Posted August 17, 2016 2013 and 2014 6MT Legacy have 4.44:1 gear ratio like the Outback, so you do not want one of those unless you are changing the the rear diff as well. Link to comment Share on other sites More sharing options...
fahr_side Posted August 17, 2016 Share Posted August 17, 2016 The gear determination threshold tables are known and if not yet defined for your ROM it's not a tall order. Change the gear ratios or even tire height and these should be adjusted. I made a spreadsheet to calculate these values if anyone wants it. As mentioned, no CANbus issues doing MT/MT swaps. Si-Drive is irrelevant. TY856 transmissions are available without DCCD and aftermarket controllers are available off the shelf if desired. My feeling is that if you broke one trans you'll break another, and some upgrade is needed. Remember that lowering gear ratios reduces transmission load and vice versa. Taller ratios for cruising sound like a good idea but in hard use the trans will be more prone to failure. 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...
ehsnils Posted August 17, 2016 Share Posted August 17, 2016 So I blew my tranny in my 2010 LGT. Looking for options for replacements that will be as strong or stronger than the 6MT that came in the GT's. I've seen mention of the 2.5i 6MT being the same with just a shorter 5th and 6th gear, but nothing that seemed very convincing, proof, or first-hand experience/confirmation. These are much more affordable and easier to come buy with low miles. Also, does anyone know if the transmission for the diesel EE20 the same as the 6MT on the GT's (http://www.boxeer.com/ee20_parts)? The diesel has the following ratios: 1 3,454 2 1,888 3 1,062 4 0,785 5 0,634 6 0,557 And a 4,444 final ratio. However I'm not sure if the final ratio has changed over the years. But if you want a new 6MT, maybe you should look for a STi box with DCCD? And the 2.0i has the following ratios: 1 3,818 2 1,947 3 1,296 4 1,029 5 0,825 6 0,738 Link to comment Share on other sites More sharing options...
ehsnils Posted August 17, 2016 Share Posted August 17, 2016 The diesel version is just as strong (read "weak") as what we have now, might as well use a replacement or rebuild. There are only two transmissions I would bill as stronger, the 5eat (iffy) and the STI 6mt. Maybe arguably the 4eat could be built stronger, but still 4 gears wont cut it. The HT CVT could also be an option, but I imagine that it would be "fun" to make that work in integration with the engine. Link to comment Share on other sites More sharing options...
FLlegacy Posted August 17, 2016 Share Posted August 17, 2016 The HT CVT could also be an option, but I imagine that it would be "fun" to make that work in integration with the engine. I don't think any automatic is an option in our cars, Sent from my SAMSUNG-SGH-I337 using Tapatalk Link to comment Share on other sites More sharing options...
dgoodhue Posted August 17, 2016 Share Posted August 17, 2016 The HTCVT in the WRX's are having issues beyond stage 1 mods, I would guess a 5th Gen LGT is going to have issue as well at stage 2. Link to comment Share on other sites More sharing options...
fahr_side Posted August 17, 2016 Share Posted August 17, 2016 The HTCVT in the WRX's are having issues beyond stage 1 mods, I would guess a 5th Gen LGT is going to have issue as well at stage 2. Yes, and that's ignoring the fact that the MT ECUs don't even have a hardware capability to communicate with the TCU, as in some pins are missing from the interface, let alone the CANbus addresses needed to get that job done. AKA, a really dumb idea. 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...
YeuEmMaiMai Posted August 17, 2016 Share Posted August 17, 2016 I'm a spirited daily driver. Don't beat hard on it but don't baby it either. Take it to the drag strip once or twice per year. I just got e-tuned on E85 and should be around 325hp/375ft-lbs. aaaaaaaaaaand this is why your transmission is dead.....it's fine to occasionally drive the car hard, but not constantly.... Link to comment Share on other sites More sharing options...
Rutchard Posted August 17, 2016 Share Posted August 17, 2016 aaaaaaaaaaand this is why your transmission is dead.....it's fine to occasionally drive the car hard, but not constantly.... The pile of timeslips I pulled from my glovebox before selling my GT disagrees with this statement. Only slight issue my 6MT had was a little grind going into 5th gear, and 5th was never touched at the drag strip. Link to comment Share on other sites More sharing options...
FLlegacy Posted August 17, 2016 Share Posted August 17, 2016 I'm a spirited daily driver. Don't beat hard on it but don't baby it either. Take it to the drag strip once or twice per year. I just got e-tuned on E85 and should be around 325hp/375ft-lbs. Do you have an aftermarket clutch? Link to comment Share on other sites More sharing options...
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