jammy Posted January 14, 2021 Report Share Posted January 14, 2021 So I recently replaced track rod ends and track arms,lower arms and top mount bushes upfront Id like to address the front camber and maybe the caster a little as the n/s front wheel looks to sit forward when looking at the car side on. After the alignment the car drove really nice but holding wheel to the right when driving but in a flat road it is nearly level.. All after measurements atmre in the green but I feel something is still not quite right imo? If I was to move the subframe over to the o/s slightly this should balance out the camber some more correct? Also the rear camber is out but now the rear toe is bang on.the rear toe has always been out on this car so I am baffled with the rear now.. I can get shims for the rear... Quote Link to comment Share on other sites More sharing options...
jammy Posted January 14, 2021 Author Report Share Posted January 14, 2021 Sorry move subfarame to towards the n/s but then the castor will go the wrong way right? Quote Link to comment Share on other sites More sharing options...
Tony Posted January 14, 2021 Report Share Posted January 14, 2021 Tuning the forces I would want the NSF caster ( positive ) but when moved it will indirectly displace the toe... Once the toe is corrected it will indirectly displace the camber, which when corrected it will move the camber. Quote Link to comment Share on other sites More sharing options...
jammy Posted January 14, 2021 Author Report Share Posted January 14, 2021 What is couldn't work out was why the guy unclamped the steering wheel 3 times during this sitting?it's not the usual guy there anymore as he is running the main garage now. Quote Link to comment Share on other sites More sharing options...
jammy Posted January 14, 2021 Author Report Share Posted January 14, 2021 The subframe would go to the offside though wouldn't it? Quote Link to comment Share on other sites More sharing options...
Tony Posted January 14, 2021 Report Share Posted January 14, 2021 Yes..... Thing is the car should have ballast installed and if this is required the target datum assumes this has been done? This my read odd but adding the driver does not change the driver's geometry? Basically the car is in two parts 1: above the coils 2: below the coils So if you think about it the "above the coils moves the unsprung position transversely. Quote Link to comment Share on other sites More sharing options...
jammy Posted January 14, 2021 Author Report Share Posted January 14, 2021 Xar has koni shocks and lowered h&e springs so as per your advice before it wasn't preloaded Quote Link to comment Share on other sites More sharing options...
jammy Posted January 14, 2021 Author Report Share Posted January 14, 2021 Booked in for 1pm Quote Link to comment Share on other sites More sharing options...
jammy Posted January 14, 2021 Author Report Share Posted January 14, 2021 First time the astra has been done and its not been right...its had 3 in 18 months when suspension was fitted when I got the car,lower arm time October time and then after warranty replacement lower arms a week'ish later Quote Link to comment Share on other sites More sharing options...
jammy Posted January 15, 2021 Author Report Share Posted January 15, 2021 So here is the latest print out I think that's as close as I'll get the subframe without the aid of a machine but its definitely made the difference... Car actually drives really realy well now.. But notice the rear camber and toe have changed again?todays result is how the rear has always been.. Any idea of what will be the culprit here? As id love to get the rear sat as equal possible again Quote Link to comment Share on other sites More sharing options...
jammy Posted January 15, 2021 Author Report Share Posted January 15, 2021 Quote Link to comment Share on other sites More sharing options...
jammy Posted January 15, 2021 Author Report Share Posted January 15, 2021 The difference in the rear is bugging me big-time. Rear Thrust angle and the difference in toe and camberbto that of the first print out Quote Link to comment Share on other sites More sharing options...
jammy Posted January 15, 2021 Author Report Share Posted January 15, 2021 And this is the previous report before lower arms topmount track rods and track rod ends was replaced.. the rear varies a lot though Quote Link to comment Share on other sites More sharing options...
jammy Posted January 18, 2021 Author Report Share Posted January 18, 2021 Having to bite the bullet for tyres now got delt a blow out today from glass on the road..replacing all 4 Quote Link to comment Share on other sites More sharing options...
Tony Posted January 18, 2021 Report Share Posted January 18, 2021 Oh my word, how unlucky is that. Quote Link to comment Share on other sites More sharing options...
jammy Posted January 18, 2021 Author Report Share Posted January 18, 2021 Tell me about it Truth is they was upnfor replacement in a 1000 miles of so anyway. What do you think is causing the difference in toe on the rear Tony? Most print outs I've seen see the rear on 0.11 Quote Link to comment Share on other sites More sharing options...
Tony Posted January 19, 2021 Report Share Posted January 19, 2021 I would like to see the even but that's just me being fussy. Quote Link to comment Share on other sites More sharing options...
jammy Posted January 20, 2021 Author Report Share Posted January 20, 2021 I share your fussiness mate,I'd like to see each value even or near as it can.. Just fitted 4 new tyres on and I have no shaking along with actual grip again as it doesn't wheelspin all the time now .. im going to book it in for another check and possibly fine tune the current set up now them crap tyres are off. I love asymmetric tyres BTW Quote Link to comment Share on other sites More sharing options...
Tony Posted January 21, 2021 Report Share Posted January 21, 2021 Asymmetric are better than directional within my industry. As we know many times it's a tyre that can make the car pull, so swapping them around can stop the pull But there are less options if they are directional Quote Link to comment Share on other sites More sharing options...
jammy Posted January 21, 2021 Author Report Share Posted January 21, 2021 So today went well..fitting the new tyres had altered things slightly and a fine tune was necessary (was done for free too) I'm still looking to cure the resr toe issue though.. Am I right that its the o/s rear toe that needs address? To me it appears that the axle seems fine given the evan balance of camber across both sides,this points the problem more than likely being the hub/wheel bearing itself being bent due to an impact forcing the wheel to turn out slightly? Quote Link to comment Share on other sites More sharing options...
jammy Posted January 21, 2021 Author Report Share Posted January 21, 2021 A random pic of the rear beam and the mounting point for the hub/bearing Quote Link to comment Share on other sites More sharing options...
jammy Posted January 21, 2021 Author Report Share Posted January 21, 2021 And the part I think needs replacing in order to reading the rear properly Quote Link to comment Share on other sites More sharing options...
jammy Posted January 21, 2021 Author Report Share Posted January 21, 2021 And the part I think needs replacing... Going back to castor again,can new tyres alrer castor angles as the castor has moved back again and I'm wondering if the subframe has moved Quote Link to comment Share on other sites More sharing options...
Tony Posted January 22, 2021 Report Share Posted January 22, 2021 If it has then look for witness marks. Also, when the geometry is measured have thy added ballast in the car? Quote Link to comment Share on other sites More sharing options...
jammy Posted January 22, 2021 Author Report Share Posted January 22, 2021 No ballast as its on Koni uprated shocks with lowered h&r springs fitted. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.