Tire sizes

Fauxari
Thu, 25 Feb 2010 15:48:45 +0000
Maintenance/Repairs

On a 1991 MR2 Turbo. I am in the process of purchasing new wheels and tires for this project car. From stock 14’s I’m thinking of installing 16x7’s in the front with 205/45-16 tires. In the rear I want to install 17x8’s with 215/40-17’s. I know the additional weight, 18lbs per wheel front and 22lbs rear, will affect unsprung weight and the larger diameters will affect the speedometer. My question is will the difference in sizes front to rear adversely affect handling? I’ve already installed struts with springs that will drop ride height 1-1 1/2 inches.

My second question is electrical. I’ve installed another motor (JDM) in this car and when I turn it over I have no spark to the plugs. I’ve got 12 volts at the coil but it’s not jumping to the plugs. I’m a little lost on this since electrical systems are not my strong point. Should I be looking closely at the distributor as the source of the problem? The JDM engine went in as a total unit with it’s distributor already installed. I’m told that these cars are critical on the ground points being correct and as far as I can tell they are all attached correctly.

4 posts - 4 participants