We raced a Tr7 in Chump/World racing League .This car had a built 1.8 Miata with Miata trans and sus.
The front sus was Tr8 with Wilwoods. The balance was perfect. Corner weighted 480(give or take 5lbs)
I was able to field a team with some advertisement $ through the business. These days are now past and
I am enjoying my retirement.
That said, racing a Tr3 was a dream I have had for years. If a guy was to do one to compete today ,you may as
well start with a Tr4a/Tr6 frame. This would have to be stiffened a lot. You would dump a Metric Crap Ton of money
into it just to be a backmarker.
The only Tr3 motor I ever did to racing tune is now in my 59. It made almost 160Hp at the crank with a comp
ratio of 9.1/1, 87mm pistols, steel rods Major head work Big cam deep nitrated crank polished and balanced.
Mad dog