zboi Posted June 3, 2020 Share Posted June 3, 2020 Is there any negative effects of changing the angle on the mcpherson strut? I want to make my rear ones near vertical to make clearance for a wider wheel. Quote Link to comment Share on other sites More sharing options...
Neverdone Posted June 3, 2020 Share Posted June 3, 2020 Changing the angle front to back, or changing the angle side to side? Quote Link to comment Share on other sites More sharing options...
zboi Posted June 3, 2020 Author Share Posted June 3, 2020 Side to side when looking at the car from the back. Quote Link to comment Share on other sites More sharing options...
74_5.0L_Z Posted June 3, 2020 Share Posted June 3, 2020 You will loose camber gain. Quote Link to comment Share on other sites More sharing options...
Ben280 Posted June 4, 2020 Share Posted June 4, 2020 Interested on how you plan to do this. Quote Link to comment Share on other sites More sharing options...
Twisted46 Posted June 4, 2020 Share Posted June 4, 2020 The answer as usual is it depends. If we are talking a few degrees then mostly just alignment(camber). If you start going crazy you will start changing the way forces are loaded in the suspension and chassis which may or may not become a problem. I would say there are better options out there. Quote Link to comment Share on other sites More sharing options...
jhm Posted June 4, 2020 Share Posted June 4, 2020 I think you're suggesting shortening your rear LCAs (and half-shafts, or CV axles) in order to achieve a shorter effective rear axle length, allowing you to run wider rear wheels & rubber without changing the exterior sheetmetal. True? If so, I think there are better ways to achieve your goals. Solid narrowed rear end comes to mind, especially if you're making big power and planning to drag race the car. Give us some more info on what you're planning to do with the car, and folks can probably help more and steer you in the right direction. Your initial post doesn't really provide much info, and just has people guessing at what you're ultimately trying to do with the car. Quote Link to comment Share on other sites More sharing options...
zboi Posted June 5, 2020 Author Share Posted June 5, 2020 (edited) I'm running a knuckle off a different vehicle so get to attach the strut to the top of it any way I want. I also plan on using a camber plate to slide the strut further inboard towards the diff, I have coilovers on the car so the diameter of the strut assembly is smaller. My main concern is the force being applied to the strut tower. It will place more force in the vertical plane, not sure if that matters though. Edited June 5, 2020 by zboi Quote Link to comment Share on other sites More sharing options...
260DET Posted June 5, 2020 Share Posted June 5, 2020 Will change the rear roll centre too, which could be good or not, depends on where the front roll centre is too. Quote Link to comment Share on other sites More sharing options...
jhm Posted June 8, 2020 Share Posted June 8, 2020 On 6/4/2020 at 8:54 PM, zboi said: My main concern is the force being applied to the strut tower. It will place more force in the vertical plane, not sure if that matters though. If that's your main concern, the rear strut towers are easily reinforced and braced. Quote Link to comment Share on other sites More sharing options...
Ben280 Posted June 8, 2020 Share Posted June 8, 2020 On 6/4/2020 at 5:54 PM, zboi said: I'm running a knuckle off a different vehicle so get to attach the strut to the top of it any way I want Makes sense now, I was trying to imagine how this would work with the factory rear uprights! Watch your roll center as 260DET said, you can easily get into trouble and the car will behave terribly. Since you're already welding in camber plates, good enough time to add some reinforcement up there, although I think if you try and get too vertical, you'll start hitting your springs on the inside of the shock towers. Quote Link to comment Share on other sites More sharing options...
74_5.0L_Z Posted June 8, 2020 Share Posted June 8, 2020 What are you using the car for (street, drag strip, track days,...)? What size tire are you trying to fit? If you choose the right wheel diameter and backspace, contact of the strut tube is not the limiting factor. On the rear, if you have coil-overs, you can run at least 5" of back space with a 15" diameter wheel. I run 15 x 10 wheels with 5.25" back space. With Hoosier 275/35-15 tires I have about 1/2" clearance at the strut tube. As you increase the wheel diameter to 17 or 18", you can increase the backspace of the wheel. The inner wheel tub is the limiting factor for modern (17", 18") diameter wheels. Quote Link to comment Share on other sites More sharing options...
zboi Posted June 12, 2020 Author Share Posted June 12, 2020 Car is street and track days use. I'm running 17x9.5 -20mm offset rear wheels, 275/40 tire. I was getting contact on the wheel lip at about an inch of before hitting the inner wheel tub. I don't want fender flares, and to get them to tuck with this size I need to get them right next to the inner wheel tub. I have stock rear struts with coil over sleeves on them, so 3" diameter springs and 10" long. Right now the springs end right at the bottom of that pocket the strut goes in, which is also right where the wheel lip is about. Maybe a shorter spring would also help. What length coilover springs do people run? Quote Link to comment Share on other sites More sharing options...
74_5.0L_Z Posted June 12, 2020 Share Posted June 12, 2020 (edited) Where are you getting contact? Tire to fender lip or tire to strut? With 17" wheels and coil-overs, you should be able to run more than -20mm offset. That equates to 4.46" backspace I run 8" springs, but my rear spring rate is 400 lb/in (probably not street friendly). With 15" wheels, I could run 5.5 inch backspace. With 17"wheels, you could get away with 5.75" backspace. Its always better to have more backspace than you can use because you can compensate with spacers. If you don't have enough backspace then there is no way to adjust besides getting different wheels. I use 5.25 backspace on all four corners, but only use spacers (1/4") on the front. Edited June 12, 2020 by 74_5.0L_Z Quote Link to comment Share on other sites More sharing options...
zboi Posted June 14, 2020 Author Share Posted June 14, 2020 Tire to fender lip was getting contact, as was strut body to rim. The wheels are rota rkr 5 x 114.3, max I could get them in was -20 offset. I got one side pretty well fitted now. Have a cm of clearance between the tire and inner tub, and maybe 4mm between strut and rim. Tire tucks for the most part. Quote Link to comment Share on other sites More sharing options...
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