Jack has posted somewhere that moving the motor back barely does anything to affect F/R % iirc.

 

It was in a thread about offset control arms. The 0.75" change in wheelbase was good for ~0.5% change in weight distribution, as I recall.

 

Agreed. A 1" engine set back should net you around .5%. A better mod as I found out, was to move the driver back about 12". That helped me about 1.5%. This is on my American Iron car.

 

I'm sure we won't be doing any major surgery on our current car. It works well enough now. Need to work on driving better. We have another car we can take our time on, and will be moving the firewall and motor back at least 6", and putting the driver in the back seat or so. A team we know did that.

 

I moved my whole front suspension about 3" forward. The limiting factor was the damned steering rack.

 

Another easy thing to do is simply get some front control arms that have Heims at the K-member end instead of bushings. This can enable you to more your tires forward a good bit, which will have a similar effect on the car's balance...

 

Move the battery to the trunk. That'll give you ~2-4% change.

 

If you have the time and don't mind a few headaches, moving the engine back an inch with a K-member that allows you to do so is a plus. Small pluses add up. My biggest headache was getting the aluminum driveshaft shortened 3/4".

Just think, moving batt to trunk (stock size for weight), sliding seat back as far as possible (8 inches here) and moving engine back, probably netted 3-4% rearward total.

Just my $.02

 

I did a number of mods to my '93 Cobra R that reduced the F/R balance down to 53.5%/46.5%
Moved the battery to the trunk, swapped on aluminum heads, removed the stock air box, moved the K member forward 5/8 of an inch, moved the engine back as far as it would go without removing or cutting anything that was in the way, converting to tubular LCA's and going C/O. The car came with no AC of course as well as none of the sound deadener that stock Foxes got. A mostly bare interior with stock pass. seat and a racing seat but a stock dash.

The car scaled at it lightest at 3050 lbs without driver. This with all the stock exterior & glass intact.