Bathurst FOSC...what a weekend...

Pilsner · Postby **Pilsner** » Tue Apr 01, 2008 11:39 am

Here is a side view video of Russell in Turbo Boy Doing 275KM/H
Video

fish · Postby **fish** » Tue Apr 01, 2008 12:41 pm

275 impressive.......

My mate did a lap time of 2:33 in a turbo MX5
and he thought he was only doing 250 down conrod ...

maybe he was doing more ????

Cal · Postby **Cal** » Tue Apr 01, 2008 1:30 pm

Yeah Nick worked out he was running out of revs at 247km/h. I'd say 275 is a tad ambitious.

Russellb · Postby **Russellb** » Tue Apr 01, 2008 5:15 pm

3.636 diff ratio 205/50-15 DO3 6th Gear 0.843 rev limit 7600
and I did hit the limiter once

Cal · Postby **Cal** » Wed Apr 02, 2008 10:05 am

According to the gear calculator I have, these are the results for an SE with that diff ratio:

Gear set: Mazda MX5/Miata 1.8 6 Speed
Gear 1 2 3 4 5 6 Final
Ratios: 3.760 2.269 1.645 1.258 1.000 0.843 3.636

RPM Limit: 7600
RPM @Peak Power: 7600
Tyre Size: 205/50 x 15
Tyre Diameter: 586.00 mm
Tyre Circumference: 1840.97 mm

Gear Km/h per 1000 RPM Km/h @7600 RPM Km/h @7600 RPM
--------------------------------------------------------
1 8.08 61 61
2 13.39 102 102
3 18.47 140 140
4 24.15 184 184
5 30.38 231 231
6 36.04 274 274

Km/h RPM (in Gears)
----------------------------------------------------------
1 2 3 4 5 6
----------------------------------------------------------

I'm not suggesting I don't believe you, just that perhaps something is wrong. Are you certain you have a 3.6 diff and are you certain the shift light is set at 7600? How much power does it have?

Brian · Postby **Brian** » Wed Apr 02, 2008 10:18 pm

This photo just about sums up my weekend. Totally surrounded from lap 1 to lap 3 of every race.

Only exception was I came from rear of grid twice. That was fantastic fun. In the last race I passed 21 cars in 4 laps. Including 10 cars from Murray's to castrol on one lap.

For the record from my data log I did 256kph into the chase on the best run and slowest was 243 and most were 248-254 range. Mind you I only once went into the chase without a car in front of me. My car was fastest in 5th gear and slowed down if I used sixth. I have a 0.88 sixth. 8,000rpm and 625mm dia tyres versus Russell's 590mm dia tyres.

Like Lou I didn't get one clear lap. On one half lap I managed to knock 4 seconds off to get a best of 2:37 but was still held up from Skyline to Forrest elbow and through the chase and Murray's. Next year I dream of having laps like Russell with nothing in front of me.

Cheers

Brian