FLlegacy Posted November 12, 2016 Share Posted November 12, 2016 If you plan on more power, forged pistons would be a good idea at this point since the motor is out and apart. Sent from my SAMSUNG-SGH-I337 using Tapatalk Link to comment Share on other sites More sharing options...
Sarang Posted November 12, 2016 Share Posted November 12, 2016 Clutch and maybe TGV deletes? Link to comment Share on other sites More sharing options...
fahr_side Posted November 12, 2016 Share Posted November 12, 2016 Clutch and maybe TGV deletes? More clutch is a surefire way to break a 5MT and TGVs aren't much restriction until you're well into the 300whp range. 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...
FLlegacy Posted November 12, 2016 Share Posted November 12, 2016 More clutch is a surefire way to break a 5MT and TGVs aren't much restriction until you're well into the 300whp range. Suppose you have the intake off anyway and aren't doing anything better that day, lol! Link to comment Share on other sites More sharing options...
Sarang Posted November 12, 2016 Share Posted November 12, 2016 More clutch is a surefire way to break a 5MT and TGVs aren't much restriction until you're well into the 300whp range. Fair enough, but at 141k miles it might be time for a new stock clutch anyways. What would you suggest? Link to comment Share on other sites More sharing options...
fahr_side Posted November 12, 2016 Share Posted November 12, 2016 Fair enough, but at 141k miles it might be time for a new stock clutch anyways. What would you suggest? Replacement stock clutch and do the TGVs if you're in there, no downside. Standard advice for anyone who has the motor out of their 5th gen: Grab some used GRB exhaust cams. If the springs are available get those too. Really wakes this motor up, great bang for buck. 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...
FLlegacy Posted November 12, 2016 Share Posted November 12, 2016 Do you know the part number for those cams, and will they need machining for the oil pump? Link to comment Share on other sites More sharing options...
matts_pats Posted November 13, 2016 Share Posted November 13, 2016 Fahr_side, please give me more info/ guidance exhaust cams, springs? Thx Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
FLlegacy Posted November 13, 2016 Share Posted November 13, 2016 I think it is just the stock sti cams, and he is recommending upgrading springs to STI or better. And I believe the exhaust cam is not the one driving the oil pump the intake cam is, so that isn't a concern. Recap, STI or better exhaust cam with STI or better springs...and go! Definitely on my list. Next question are the STI intake cams a worthwhile upgrade? Link to comment Share on other sites More sharing options...
FLlegacy Posted November 13, 2016 Share Posted November 13, 2016 I looked up the part numbers: cams: L 13052AA730, R 13034AA730 $158.96 each springs: 13217AA440 $6.16 each 8 needed cam seal: 806742160 $4.64 each 2 needed And the cam seals have a different part number than the Legacy ones so they definitely will need replaced. Those prices are for new parts from subaruonlineparts.com Link to comment Share on other sites More sharing options...
cww516 Posted November 13, 2016 Share Posted November 13, 2016 I couldn't tell you where I saw it, but I'm pretty sure I read somewhere on here that they're the same profile as our stock cams, so no use in swapping them in. Think it may have been either Swannee's or s2's thread, but I'm not positive. Link to comment Share on other sites More sharing options...
FLlegacy Posted November 13, 2016 Share Posted November 13, 2016 The STI cams are not the same as ours, part numbers and prices are different, springs are also different, I would bet they have more spring pressure to complement the higher lift or longer duration. Link to comment Share on other sites More sharing options...
cww516 Posted November 13, 2016 Share Posted November 13, 2016 Sorry, I probably should have quoted your first post there. The exhaust cams are definitely different, they have more lift (and possibly more duration, I don't remember). The intake cams are what I was saying are the same profile as ours. Link to comment Share on other sites More sharing options...
FLlegacy Posted November 13, 2016 Share Posted November 13, 2016 Possible, but I doubt it the STI makes lots more power than the LGT or WRX the cams are probably a big part of that, and again different part numbers. Link to comment Share on other sites More sharing options...
fahr_side Posted November 13, 2016 Share Posted November 13, 2016 Thanks FLlegacy for the research and help with translation. However, the part numbers I have for the exhaust cams are 13034AA710 and 13052AA710. The spring P/N being 13217AA440. Correct the turbo scavenge pump is driven from the intake cam. Interestingly the STi intake cam has the slot to drive a pump it doesn't have. Makes me wonder if they weren't thinking at some point to do the low mount turbo on that car. There are lots of used GRB cams for sale on nabisco, IWSTI etc., often bundled with the springs. Giveaway prices. The BR9 cam seals work fine with the STi cams. Only the profiles are different. Remember some parts are interchangeable even they have different part numbers. Just FYI the intake cams are identical but the springs are not. However the BR9 springs do not seem any softer. I'd swap to the STi springs if you have them but wouldn't go buy them if you don't. The STi cam has about 1mm more lift and the profile looks much like that used in single-AVCS EJ255 motors you find in the WRX / FXT models and 4th gen LGT. With the STi cams in the motor makes much better torque over the whole rev range and it becomes worthwhile actually revving it to redline. All upside. You get the early spool from the short header, you get more overlap during spool to get the turbo spun up, and you get better midrange and top-end from the extra lift and duration. 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...
BBPeik Posted November 13, 2016 Share Posted November 13, 2016 With the STi cams in the motor makes much better torque over the whole rev range and it becomes worthwhile actually revving it to redline. Very true. I know looking at my power curve after having the STI cams, my HP is still climbing even at redline. Well worth doing the cams if you get the chance. Especially since they will be out of the motor anyway and you can get them for cheap. My someday I will be done with it thread. Link to comment Share on other sites More sharing options...
cww516 Posted November 13, 2016 Share Posted November 13, 2016 Kind of a long shot here- fahr_side, have you seen any instances where swapping in the STI exhaust cams is enough to induce overboost in a vehicle that didn't otherwise have that issue? I know we're pretty much right on the edge depending on wastegate porting and choice of exhaust components, and to my uneducated mind, better exhaust flow and more power could cause issues with keeping boost in check. Link to comment Share on other sites More sharing options...
fahr_side Posted November 13, 2016 Share Posted November 13, 2016 Yes, I'm sure it will make it worse as more exhaust flow is the whole point. 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...
FLlegacy Posted November 13, 2016 Share Posted November 13, 2016 So a turbo upgrade with the exhaust cams is the best option, lol! Link to comment Share on other sites More sharing options...
cww516 Posted November 13, 2016 Share Posted November 13, 2016 Will the enabling never cease? Link to comment Share on other sites More sharing options...
FLlegacy Posted November 13, 2016 Share Posted November 13, 2016 Will the enabling never cease? That was a good laugh! Link to comment Share on other sites More sharing options...
GTEASER Posted November 13, 2016 Share Posted November 13, 2016 There's a whole thread on this gentlemen, and this thread is not the place for this discussion. 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...
matts_pats Posted November 14, 2016 Share Posted November 14, 2016 08-14-SUBARU-IMPREZA-WRX-STI-OEM-LH-EXHAUST-AVCS-CAMSHAFT-CAM is this what you are talking about? The used ones I am finding do t not list p/n. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
FLlegacy Posted November 14, 2016 Share Posted November 14, 2016 08-14 STI with avcs is exactly what you need. Link to comment Share on other sites More sharing options...
FLlegacy Posted November 14, 2016 Share Posted November 14, 2016 The cams ending in 710 are listed specifically for 08-10 STI wagon, while the sets ending in 730 are listed for 2010-2017 STI Should there be any difference? Link to comment Share on other sites More sharing options...
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