Mythbuster: continuing project thread of my 1303 '75

[judgie]

nice pic's. did you notice any differance with having the rear wing fitted?

[Wally]

Originally Posted by judgie

nice pic's. did you notice any differance with having the rear wing fitted?

I knew someone was gonna ask me that
Unfortunately, I have changed about 6 seperate things (LSD, stiffer front springs, different brake balance, bit more boost, removed 40lbs front seat and the wing) on the car before this final. I drove 2,5 seconds of my lap time compared to last month on the same track. It was also quit a bit warmer (more tire grip) and I may have driven a bit more agrressive, so you tell me what caused it by what percentage..?
From my (very) limited seat of the pants feeling, I'd say the higher boost, more grip from the warmer tarmac and my driving made the most difference.
The LSD did not give more understeer at all (to my surprise), but did make the car brake hard more stable. It didn't wiggle its tail anymore under hard braking, even though my top speed at the end of the straight was now 210 km/h (131 mph in 4th gear, approaching 7K rpm) and 5 km/h faster then last month.
There was a point where I (finally) felt the rear tires blocking and I immediately adjusted the Tilton brake bias adjuster (for the first time I ever needed it!) a few clicks. Also a few times on WOT accelerating out of a tight corner in second gear, the rear wanted to step out a little, but I think the LSD also made that exercise a little more controllable, if not for having prevented a spin alltogether.
So, not sure the wing did anything. But its my own basterdized wing, so it doesn't mean _a_ wing would not help. I think it does, but a little better design then just the flat sheet of alu that I used, might work better :-)

Even so, compared to other (modern) cars with much less hp, I am still relatively (very) slow!! I can only conclude I probably cannot drive and/or don't push it to the limits at all. I do want to get home and getting old(er), so that might have s/th to do with it too LOL

I did the laps on 20 psi of boost, so with about 425 chp on the track! and it all went well as I drove the car home on its own wheels afterwards.

All in all, I found it a very good ending of the season