RobPhoboS Posted March 11, 2015 Report Share Posted March 11, 2015 Hi guys, a very long old time since I've been here but HAVEN'T forgotten I'm just in the process of making adjustments to my car, specifically the handling, largely for b road driving and a few track days.It's on the 18" ray's (8jF 8.5jR/+30mm offset F +33mm offset R/225/45 & 245/45 MPSS), slightly lower on Tein S springs (drop is small, -17mm F -14mm R) and Bilstein B6 shocks, DW adjustable front camber arms and just waiting for the Eibach adjustable ARB's.FrontCamber:-2°L -2°R Caster:9° L9°11 RToe:0°02 L0°02 RRearCamber-1°47 L-1°44 RToe:0°05 L0°04 RSteer ahead:0°00Thrust angle:0°00Just wondering if that seems like a reasonable set up ? Quote Link to comment Share on other sites More sharing options...
Tony Posted March 11, 2015 Report Share Posted March 11, 2015 Reads good to me other than the high castor. I assume this is due to the cars rake unless you have adjustable control arms? Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted March 11, 2015 Author Report Share Posted March 11, 2015 Reads good to me other than the high castor. I assume this is due to the cars rake unless you have adjustable control arms? Hey Tony, many thanks for your input ! These are the adjustable upper camber arms I have: http://www.driftworks.com/driftworks-front-camber-arms-nissan-350z.html I forgot to mention I also have most of the front end with Prothane poly bushings installed (very good quality and price), the only one which isn't is the compression arm/rod which has a SuperPro bushing with adjustable caster. SPF2849K PDF here: http://www.superpro.com.au/superpro-parts/?p=superpro-bushing-kit-spf2849k&view=part&id=SPF2849K&cid=999501121&vid= As these were just installed onto new compression arms, they probably require a bit of adjustment. Quote Link to comment Share on other sites More sharing options...
Tony Posted March 12, 2015 Report Share Posted March 12, 2015 I know of those adjuster arms. Any reason why the castor is at nine degrees? Quote Link to comment Share on other sites More sharing options...
adam_r Posted March 12, 2015 Report Share Posted March 12, 2015 Does seem alot of caster angle there. Would moving the subframe forwards produce this sort of effect? I didnt think a bush alone would give 9 degrees worth of positive caster Quote Link to comment Share on other sites More sharing options...
Tony Posted March 12, 2015 Report Share Posted March 12, 2015 Yes and yes.... The castor has so many duties and i feel nine degrees is way to much, seven would be high? The cambers are about right but there shouldn't be any toe if it has rated bushings. Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted March 12, 2015 Author Report Share Posted March 12, 2015 Once I get back to my Mum's place on the weekend I'll dig out some previous alignment print outs and see what's what. I dug this out from the manual: Caster min 7.42deg nominal 8.17deg max 8.92deg L/R diff. .75deg So bringing it back to around 8.5 would be a bit better I guess.Tony - I presume this is something you can do ? (I'm guessing the bushing needs pressing out and rotating?) Quote Link to comment Share on other sites More sharing options...
Tony Posted March 12, 2015 Report Share Posted March 12, 2015 No, with these> All you need to do is adjust the arms pick up point at the chassis to move the castor..... The centre ball joint adjuster is the direct adjuster for the camber. 1 Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted March 12, 2015 Author Report Share Posted March 12, 2015 Ahh yes I see. I wasn't entirely sure if those end parts were used for that, well that'll save pressing the bushing out hopefully Quote Link to comment Share on other sites More sharing options...
Tony Posted March 12, 2015 Report Share Posted March 12, 2015 Yeah it will and they work well albeit fiddly..... Castor needs to be backed off to 7 degrees 30' with -2 degrees camber and zero toe... At the moment the camber migration is to slow and on full lock it could hold on lock..... For example the cars we have in competitive Drift run -3 degrees front camber and 7 degrees castor any more would be detrimental. 1 Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted March 12, 2015 Author Report Share Posted March 12, 2015 Many thanks for your help Tony, I'm still (obviously ) learning and good to know these details . I'll try and dial it in a bit better this weekend, if not much better I'll get myself booked in over to you when convenient. Quote Link to comment Share on other sites More sharing options...
Tony Posted March 12, 2015 Report Share Posted March 12, 2015 All you need to do is decrease the length of the front upper point or increase the rear point, sometimes we have to do both depending on the adjustment range. 1 Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted March 12, 2015 Author Report Share Posted March 12, 2015 Just very quickly in regards to camber migration being slow, does that account for a slower steering response feel ? Quote Link to comment Share on other sites More sharing options...
adam_r Posted March 12, 2015 Report Share Posted March 12, 2015 Yes. The exsessive castor is almost holding the steering where it is. The castor should be less so if you let go of the steering wheel during mid turn, the steering should self center. With such a high castor the steering will want to 'hold' it position which could be rathef scary in an unexpected oversteer moment 1 Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted March 12, 2015 Author Report Share Posted March 12, 2015 Many thanks for the clarification on that.I'll see how it goes, I know that there isn't much adjustment in those end bolts, quite minimal thread it seemed. Quote Link to comment Share on other sites More sharing options...
Tony Posted March 13, 2015 Report Share Posted March 13, 2015 Use both adjusters each side that will do it. 1 Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted March 17, 2015 Author Report Share Posted March 17, 2015 I didn't get a chance last weekend to do this but this time I will.I'll report back once adjusted.I did get the camber from -1°5 to -2 though. Quote Link to comment Share on other sites More sharing options...
Tony Posted March 17, 2015 Report Share Posted March 17, 2015 Using the centre adjuster i assume? Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted March 17, 2015 Author Report Share Posted March 17, 2015 Using the centre adjuster i assume? Exactly. Where it was before seemed like it was putting a bit too much stress on that joint, now it's at -2 the thread 99% within the joint now. So I feel more confident with it there as well. (it was only temporarily set there) Quote Link to comment Share on other sites More sharing options...
Tony Posted March 17, 2015 Report Share Posted March 17, 2015 Obviously it will change when you set the castors but not by much. 1 Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted March 22, 2015 Author Report Share Posted March 22, 2015 Spent quite some time trying to get it but ultimately failed hah. I'm going to have to book it in with you guy's asap. Quote Link to comment Share on other sites More sharing options...
Tony Posted March 22, 2015 Report Share Posted March 22, 2015 Oh dear...... How was you getting readings for the castor position? Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted March 22, 2015 Author Report Share Posted March 22, 2015 A local place let me pop it up on their ramp with a Hunter machine but it was getting towards closing time. It was weird, I got the camber pretty close, and one sides caster... However the opposite side caster got less and less. I'll call tomorrow morning. Quote Link to comment Share on other sites More sharing options...
Tony Posted March 22, 2015 Report Share Posted March 22, 2015 That's the thing sometimes the camber adjuster needs to be set neutral or it's extended position acts like a push on the castor adjustment. Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted March 22, 2015 Author Report Share Posted March 22, 2015 That's the thing sometimes the camber adjuster needs to be set neutral or it's extended position acts like a push on the castor adjustment. Yep - that definitely happened. My fault, totally - it's a bit of a balancing act I see Quote Link to comment Share on other sites More sharing options...
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