Rhitter Posted July 8, 2016 Share Posted July 8, 2016 It seems like the majority of the VDC issues here is the massive change from a 19:1 rack to the 13:1 rack, that's like 50% difference in the angle when the car thinks VDC should come on. Whereas going from 15:1 to 13:1, or 19:1 to 15:1 would only be a 15% or 25% difference, respectively, and may not show up as readily during daily spirited driving to the point where VDC erroneously interrupts. I have VDC issues in my car too. The OBXT doesn't have 19:1 (like the Forester), but it is higher than the Legacy rack. Most of them are solved by turning off traction control. However, the system is not fully defeatable, so quick decreasing radius turns I get ABS pulsing way too easily. But I don't get that one brake dragging hard that happens with the system on. Eventually looks like I'll need to look into scaling the signal up.... My OBXT build Link to comment Share on other sites More sharing options...
GTEASER Posted July 8, 2016 Share Posted July 8, 2016 (edited) I know you were having issues too. How many turns lock-to-lock for you? My Forester is 3.2 and I was just assuming that was approx. 19:1. EDIT: Thanks for correcting me with the 16.5:1. Edited July 8, 2016 by GTEASER 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...
Rhitter Posted July 8, 2016 Share Posted July 8, 2016 I know you were having issues too. How many turns lock-to-lock for you? My Forester is 3.2 and I was just assuming that was approx. 19:1 (because I saw that number here somewhere) but might be more like 17:1. OEM is 3.2 lock to lock, 16.5:1 My OBXT build Link to comment Share on other sites More sharing options...
GTEASER Posted July 8, 2016 Share Posted July 8, 2016 I edited my older posts to get rid of my erroneous 19:1 number. I think that may be why you and oldskoolbiker are having problems, the angle difference between 16.5:1 and 13:1 is too big. 16.5:1 to 15:1 would have been safer, although probably not as huge an improvement in feel, and that's what I plan to do. A guy on http://www.subaruforester.org did just that with his 2011 FXT, installed a 2013 STi rack (15:1) in his FXT (stock rack is 16.5:1), and he has had no issues with VDC. 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...
Underdog Posted July 8, 2016 Author Share Posted July 8, 2016 Anectdotal but I recall VDC OBXTs switching to LGT racks previously without issue. It seems that stepping down to the 13:1 '15+ STI rack will cause issues in VDC LGTs and OBXTs alike. The Crimson Dynamo Link to comment Share on other sites More sharing options...
Rhitter Posted July 8, 2016 Share Posted July 8, 2016 Anectdotal but I recall VDC OBXTs switching to LGT racks previously without issue. It seems that stepping down to the 13:1 '15+ STI rack will cause issues in VDC LGTs and OBXTs alike. The 13:1 STI rack is so nice though.... I am not sure how the VDC issues show up at the track. But just turning off the system in every day normal driving is 100% worth it in my opinion. I edited my older posts to get rid of my erroneous 19:1 number. I think that may be why you and oldskoolbiker are having problems, the angle difference between 16.5:1 and 13:1 is too big. 16.5:1 to 15:1 would have been safer, although probably not as huge an improvement in feel, and that's what I plan to do. A guy on http://www.subaruforester.org did just that with his 2011 FXT, installed a 2013 STi rack (15:1) in his FXT (stock rack is 16.5:1), and he has had no issues with VDC. WRX USA installed a 15:1 rack in his Outback with VDC and also has no issues. My OBXT build Link to comment Share on other sites More sharing options...
GTEASER Posted July 8, 2016 Share Posted July 8, 2016 I think taking both steps in ratio is where the problem lies. One step and you're fine. Somewhere here there was a link to a NASIOC thread where a guy put a little converter box in. Maybe that is your solution rhitter. 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...
Rhitter Posted July 11, 2016 Share Posted July 11, 2016 Can confirm, VDC re-calibration procedure does not fix the issue. Arduino is my next step. Honestly though, just turning off VDC works for now. so it will probably be awhile before I do that. Especially because I have no experience with Arduinos. My OBXT build Link to comment Share on other sites More sharing options...
Gabo Posted July 11, 2016 Share Posted July 11, 2016 Random question but couldn't we also upgrade the VDC sensors to STI ones? Then recalibrate. Link to comment Share on other sites More sharing options...
Rhitter Posted July 12, 2016 Share Posted July 12, 2016 (edited) Random question but couldn't we also upgrade the VDC sensors to STI ones? Then recalibrate. It's not the sensors. It's the brain that's the issue. The fix wasn't a recalibration of the sensors, it was to scale the signal into the range that the brain accepted. If you could replace the VDC module with an STI one (not sure that that's possible) it should work fine. No idea what that would take though. Edited July 12, 2016 by Rhitter My OBXT build Link to comment Share on other sites More sharing options...
Rhitter Posted July 12, 2016 Share Posted July 12, 2016 not a bad deal http://www.ebay.com/itm/15-16-SUBARU-IMPREZA-WRX-STI-OEM-STEERING-RACK-AND-PINION-/331903701757?hash=item4d470092fd:g:I4IAAOSwkl5Xf9q7&vxp=mtr save $200 off what I paid. My OBXT build Link to comment Share on other sites More sharing options...
scoobyscoodle Posted July 12, 2016 Share Posted July 12, 2016 Any concern in buying a rack from a wrecked car? I just may pick that one up. Link to comment Share on other sites More sharing options...
GTEASER Posted July 12, 2016 Share Posted July 12, 2016 Any concern in buying a rack from a wrecked car? I just may pick that one up. I would say only if it was hit in the front or side front. I have a pic of the totaled car that the one I may buy is coming from, and it was hit in the driver's side B-pillar, so the wheels didn't take any impact. 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...
Arcteryx Posted July 12, 2016 Share Posted July 12, 2016 Any concern in buying a rack from a wrecked car? I just may pick that one up. That would be my concern as well. If it was a front end hit, the tie rods or the rack itself might have been damaged. Link to comment Share on other sites More sharing options...
Rhitter Posted July 13, 2016 Share Posted July 13, 2016 With the seller saying "“LIKE NEW WITH 600 MILES ON DONOR VEHICLE”" I think Paypal would side with you pretty easy if it isn't actually like new. My OBXT build Link to comment Share on other sites More sharing options...
scoobyscoodle Posted July 13, 2016 Share Posted July 13, 2016 I'm sure it LOOKS like new, but the one pic on the posting showing the dash shows a shattered windshield and a driver airbag deployed, which doesn't give me much confidence that the rack wasn't jolted and possibly will have internal damage that will show up later. Maybe it was just in a rollover? Link to comment Share on other sites More sharing options...
Underdog Posted July 13, 2016 Author Share Posted July 13, 2016 The gearbox can back drive so the crash would have to have been under very specific circumstances to damage the internals. Even so, i would think the inner tie rod would take the brunt and would be deformed. Any used part is a risk but 1) IMO the risk is low, 2) the cost/savings is pretty good, and 3) the buyer is protected somewhat from some risk (if the part is fraudulently listed). I'd snatch it up. The Crimson Dynamo Link to comment Share on other sites More sharing options...
GTEASER Posted July 13, 2016 Share Posted July 13, 2016 Assuming that you install it immediately and identify any issues within the PayPal Protection period. 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...
Arcteryx Posted July 13, 2016 Share Posted July 13, 2016 I just bought it. Link to comment Share on other sites More sharing options...
Arcteryx Posted July 13, 2016 Share Posted July 13, 2016 Its only the stub threads - the rest of the ITR is identical (save for the length). Only the 15+ STI rack got the 20mm stub threads. The ITR spherical joint is the same size between the LGT and STI as well. So just to confirm - to get back some of the toe-in adjustability, all I need to do is install thinner jam nuts on the ITRs, correct? And these are M14x1.5 regardless of what year the rack is? Link to comment Share on other sites More sharing options...
scoobyscoodle Posted July 13, 2016 Share Posted July 13, 2016 Damn you Arcteryx! lol Link to comment Share on other sites More sharing options...
Rhitter Posted July 13, 2016 Share Posted July 13, 2016 So just to confirm - to get back some of the toe-in adjustability, all I need to do is install thinner jam nuts on the ITRs, correct? And these are M14x1.5 regardless of what year the rack is? Yes just thinner jam nuts. Underdog linked the site earlier in the thread. I bought those. I also cut 2-3 threads off the tie rod for some more adjust-ability, but as you can see it probably wasn't needed. This picture was taken after the rack was aligned. http://i.imgur.com/g4ugK3j.jpg My OBXT build Link to comment Share on other sites More sharing options...
WRX USA Posted July 13, 2016 Share Posted July 13, 2016 WRX USA installed a 15:1 rack in his Outback with VDC and also has no issues. It's actually a SpecB rack, and I know it is different part number than the LGT one. You are correct that I've had zero issues. Underdog (or anyone else) - Can you confirm the ratio on the SpecB rack? Link to comment Share on other sites More sharing options...
scoobyscoodle Posted July 13, 2016 Share Posted July 13, 2016 SpecB rack is the same ratio as the lgt at 15:1. Has anyone with a VDC legacy (non-outback) gone from the 15:1 rack to the 13:1 Sti rack and had issues? It seems like the WRX guys that went to the Sti rack didn't have issues, and most of the issues I see are people making very large changes in ratio, i.e., 15:1 going to a 11.5:1 Q rack, or the outback/foz guys going to the new 13:1 rack. Link to comment Share on other sites More sharing options...
GTEASER Posted July 13, 2016 Share Posted July 13, 2016 It seems like the WRX guys that went to the Sti rack didn't have issues, and most of the issues I see are people making very large changes in ratio, i.e., 15:1 going to a 11.5:1 Q rack, or the outback/foz guys going to the new 13:1 rack. This is exactly what I was getting at. 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...
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