I've looked at a number of other pics of the preprod show car, and if you look carefully you can make out a 17 in the tire size. I'm pretty sure it's a 17" wheel/tire with like a 205/50 tire. See this pic, for example:Skywagon wrote:The preproduction car had 16" wheels, the same castings as on the production car except with a spun finish on the face.
Sweet!Skywagon wrote:As far as lowering the car I am looking at several options and have the attention of K-Sport and they are working on getting some hardware together for a test fitting on my car.
I was wondering who'd be the first to install moon covers on their wheels...Skywagon wrote:Not to mention the air around the wheel wells will be turbulent to start with due to a spinning wheel. If you want to truly help aerodynamics around the wheels then you need full moon covers. Aerodynamics is kind of my thing as I am an Aerospace Engineer.
There are shims you can get to adjust the toe/camber on the rear axle. They go in between the hub/axle.Skywagon wrote:There will be no camber adjustments as it is a beam axle.
Good target - although on my street driven WRX I run about 1.25-1.5 and don't get any extra inside wear though it does tend to wander slightly more.Skywagon wrote:The max camber I would want for a street car would be around 1 degree negative. I imagine that lowering it 1.5"-2" would yield a negative camber in that range or less. I will have to see once I go down that path.
Skywagon wrote:Also, when I dropped off the wheels and tires to be swapped over I put a set of 18" Rays Forged wheels on the LEAF that I have for my Mazda (just for storage in my shop/hangar, did not drive on them)... it looked so strange/funny that I took a photo (ignore the camera phone quality):
Just thought some might want to see those as well as they are still 5 lbs less than the stock wheels, but the increased size and tire width would hurt the efficiency/range over the stock wheels.
To be scientific about it, gather data on the new rims for several months, then pop in the original rims and compare.. he would be a hero to the Leaf community after going thru all this trouble.. in any case there must be a reason GM is using light forged aluminum wheels in the Volt and Cruze Eco models.palmermd wrote:Is there a trend of improved efficiency showing up as a result of this upgrade? I know you were expecting 5-8%, but can you estimate that you've had any improvement?
Very good information! Please update when you have more info re. efficiency (and suspension, maybe in a new thread).Skywagon wrote:As far as the 18's, if you want to decrease your acceleration and efficiency then go right ahead.
As far as the replacement wheels, I have only put 600 miles on the car but I am seeing a shift in my range over time of about 4-6%. I will need more data points to further validate this. The other benefits are turn-in and composure in the turns. The 1/2" wider wheels change the angle of the sidewalls just enough to reduce the rolling over of the tire. Also, the 40mm wider track helps with stability, without running wider tires and losing efficiency.
As far as lowering the car, that is in work and I hope to have a solution soon.