A rear bar from a VL commodore works well on my circuit coupe. 14mm from memory. I cut off the eyes and made sliders w 6mm rod ends going to light channel w holes mounted to the body. Cost about $50 all up. It has 12 holes of adjustment. I just add roll stiffness with the bar as I lower the rear roll center.
Its simple, light, cheap and effective. Maybe an option for you

Car is finally back together.
New gated sump fitted. Head drain installed. New head gasket.
Gearbox replaced and sandwich plate holes closed up to stop rear oil surge.
Ready for the upcoming race weekend. Looking forward to my first race at barbagello.
Rear sway bar is on order, may not get installed before the race.

Raced on the weekend, big storm the night before threatened to make it a wet track. GT cars went out for a 20min practice and dried it out, some scattered lite showers throughout the but ended up a dry track for all our races. The grid was combined with Street Car category (Local WA Category, these have a lot less restrictions then IP so they had no turbo restrictors and greater Aero freedom).

I qualified 2nd in IP.
Race 1 I lost 2 IP places within the first lap and was catching the Torana of Mark Ellis and on lap 4 I blow off an intercooler hose, pulled into the pits for repair and was found to have the front ride height too low so was disqualified from the race. No excuses from me, in the move from NSW I jacked the car up to avoid transport damage, when I lowered it again I forgot to check front ride height and was 5mm low on the driver side.

Race 2 started rear of grid in 32nd. Finished 7th outright, 1st in my class and 2nd in IP outright.

Race 3 started 14th and finished 4th outright, 1st in Class and IP outright.

Awesome weekend of racing. Videos to follow when I get a chance to edit them.

mcgee,

Unbelievable progress on ur driving.
its astonishing results and to think you haven't even been racing for a long period of time.Future looks very promising for u if u keep at it at this kind of rate.
I can only imagine what impact your coupe will cause once u gain alot of experience and become a seasoned race driver.

videos please!!

keep up the good work!

Thanks for the comments.
I have front and rear cameras, so will try to mash it together with data overlay tonight.
I haven't seen the footage myself yet.
Looking at Natsoft I made up 7 postions in lap one of race 3 :)
Also lowered my best lap in race 3 to a 1:05.2.

Looking forward to getting my rear ARB and stop some of the rear body roll, hopefully leading to more drive mid/out of the corner.

Videos uploaded. enjoy.

Race 2 - rear of grid start

Race 1 - Not so good finish

Race 3 - round out a pretty good day

ive had a quick preview so far and it looks very busy out there on track especially from the start.
i do enjoy your video's, thanks for posting. and congrats on the achievements with the car so far

another race weekend over. Videos to follow in the coming days.
Qualified 3th, broke into the 64sec bracket, just 64.9.
Was late to the dummy grid so started rear of grid.
Finished race 1 in 4th.
Started mid field in race 2 (reverse grid). Lucky for me the starlet of Matt Cherry broke and I took out race 2.
Stated on Pole for race 3, lost a couple of positions and as I was coming back I binned it at turn 6, silly me, in turning around I drove into the sand trap, race over. DNF. The positive on race 3, managed a 64.2sec lap.

Race 1 uploaded.

Race 1

awesome mate
one of my favorite builds!!
ur coupes' power to weight ratio is very evident on the straights :}
also pm me ur email.Ive got some ebooks on track racing which could be of interest to you mate.i.e 5 Speed Secrets ebooks in pdf format: Professional Race Driving Techniques by ross bentley which i could email to you.

and upload more videos please:}

cheers