slngsht Posted February 11, 2012 Share Posted February 11, 2012 What is the typical ground clearance for the chassis with 10" rims? As it sits, my chassis is about 6" off the ground, with lower Aarms pretty much parallel to the ground. My oil pan is flush with the chassis, so I don't need that much ground clearance - plus this car probably won't see much road duty at all - if any. What's the common solution to lowering the chassis without screwing up the front suspension geometry? I have my own ideas, but don't wanna hack this chassis Link to comment Share on other sites More sharing options...
JohnCh Posted February 12, 2012 Share Posted February 12, 2012 Is the rim size a typo? Might help if you also indicate the tire size since that will have the biggest impact on the ride height. -John Link to comment Share on other sites More sharing options...
slngsht Posted February 12, 2012 Author Share Posted February 12, 2012 John, more of a brain fart than typo... 13" rims. tire diameter looks like 20.5" Link to comment Share on other sites More sharing options...
Guest Terry Posted February 12, 2012 Share Posted February 12, 2012 what engine is in the car will determine how much change you can make to the ride hight, if it's a bike engine you can drop it right down. More details, what are you doing with it. Has the car been corner weighted? Link to comment Share on other sites More sharing options...
slngsht Posted February 12, 2012 Author Share Posted February 12, 2012 Terry, Yamaha R1, sitting pretty far back. What do you mean by "drop it right down"? If I lower too much won't I run into steering geometry issues? Is the optimal zero ride height of the suspension at the point where lower A-arms are parallel to the ground? Link to comment Share on other sites More sharing options...
slngsht Posted February 12, 2012 Author Share Posted February 12, 2012 Oh and the car has not been corner weight. Still under construction. I intend to primarily use it for autox Link to comment Share on other sites More sharing options...
Guest Terry Posted February 12, 2012 Share Posted February 12, 2012 (edited) Corner weight it first, before you drop the front. Our Caterham Hayabusa race car has been dropped 2 inches on the front and it transforms it. You might want to consider taking the font Sway-Bar off if you are Autocrossing it. The BIG mistake that most people make with the Caterham is making it 2 stiff on the front end; the car must have polar moment. If your running slicks I would suggest 12 lbs in the front 16 in the rear. Edited February 12, 2012 by Terry Link to comment Share on other sites More sharing options...
slngsht Posted February 12, 2012 Author Share Posted February 12, 2012 So the inboard side of the lower AArms are 2" lower than the outboard end? No bump steer issues? Link to comment Share on other sites More sharing options...
Guest Terry Posted February 12, 2012 Share Posted February 12, 2012 I will measure it and send pictures. Bump steer is only an issue if the car is being run on the road. Link to comment Share on other sites More sharing options...
Guest Terry Posted February 12, 2012 Share Posted February 12, 2012 This gives you an idea how much the car has dropped. http://terryjohns.ca/hanna.jpg Link to comment Share on other sites More sharing options...
slngsht Posted February 12, 2012 Author Share Posted February 12, 2012 Wow, that's quite a drop Link to comment Share on other sites More sharing options...
MichaelD Posted February 13, 2012 Share Posted February 13, 2012 Mazda, I went to measure mine and found it still had the 15" Wheels on. Ride height is 5.15" behind the front A arm and 5.5" in front of the rear wheel. Balance is 49% F and 51% R The Raceline Pan is the lowest point. With the 13" wheels it only has 1" clearance. Link to comment Share on other sites More sharing options...
jlumba81 Posted February 13, 2012 Share Posted February 13, 2012 Terry, Just curious but how much does the ride height change from the downforce at top speed? Link to comment Share on other sites More sharing options...
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