I am building a mid engine pile out of a collection of easily accessible junk.
Here is how it sits. For several reasons I have decided to run swap the ifs for a solid axle.
I am running the numbers on a triangulated 4 link. That will have an extension off the upper links to airbags making this a cantilevered setup.
I am at the point I am ready to build a crossmember right in front of the engine mounts that will go under the engine and cut the frame in front of that engine out.
Ran my numbers and they look good then my dumb butt asked myself one question.
Is having a wider track going to mess things up?
So my pile has a 81" wheelbase with a center of gravity at 26" with a weight bias is 60-65"% rear.
I am running a 78/79 full width 9" and a 91 2wd jeep cherokee dana 30 for axles.
My current front axle and tire width won't change much. I am running a 24 3/8" tall tire that is 8 3/4" wide with the outside of the tires being 63" wide overall for a 54.25 track width.
For the rear I am currently running a 26 3/4" tall tire that is 9.5" wide with the outside of the tires being 73" wide overall for a track width of 63.5.
Now this is the minimal rear tire width I plan on running. Where things get fun is what I plan on bolting up after changing the 3rd out for the proper gearing for the application as I am only using 2 of the sm465's 4 forward ratios(3rd/4th straight throw). I plan on running UP TO a 18.5" wide 31" ish tall pro street or UP TO 13" wide 33" tall paddle. I have 16" between the frame and the 78/ 79 F150 stock 9" wms. I should be able to keep most of that tire close to the frame with rim offset moving that rear track inward with wider tires.
Now I "think" having the wider track in the rear and having the weight biased towards the rear is going to promote understeer. Especially under acceleration. What I am trying to eliminate is oversteer and excessive pro roll under breaking in a turn. You know things that could break some glass.
With the even wider tires in the rear I should maintain the track being wider then the front at all times.
But I need to be really careful I get these 4 link numbers close so I dont need to build this front suspension a 2nd or 3rd time.
Right now I am planning on making gusseted tabs on the frame and axle that the crossmember and front axle link mounting brackets can bolt to. Just building and then testing it kind of deal.
I would like to get things close on paper first though. If I need to redo the numbers to account for the wider rear tracks effect on the front I will.
I just have no idea how to actually figure out how to actually get that diffrence in track width number to then change things based off that number.