Rich

Finding any details on the Weir unit seems pretty hard - it's not on their website for instance. That doesn't give me a good feeling. One place has them for 318 CAD which is a good price though - maybe £350-400 landed.

What happened at Trax last year? Was that when Faith crashed?

Had a quick look - I can't see any changes to the actual legislation, just the penalties. That means using a phone in a cradle is still legal; it becomes illegal if you pick it up or if you are distracted. The distraction argument works for any device, built-in or otherwise.

Yes, if you pre-book it, they will work weekends.

He's got no cats so it's not that bad.

I may well do. I think I need to hear one to see how annoying the whine is to me. The 4.556 being OEM is going to be quieter.

Something that's not obvious from my graphs above is that it's very dependent on shift point and speeds. The numbers above are somewhat of a best case for longer FDs as I had it setup with redline (7400 rpm) shifts and always using the highest gear possible. In the real world you wouldn't downshift to 1st at 30 with a 4.1 FD, so the 30-X numbers are a little misleading. This graph is a better representation - the shift points are 5k RPM 1st-2nd and 7k RPM for 2nd-3rd, 7.2k for 3rd-4th and 4th-5th, 7.3k for 5th-6th. Shift times are 0.5s and 0s (to illustrate how much difference is in the gearing rather than shift times). Results are a bit more as you'd expect - at lower speeds the increased torque at the wheels tends to favour the higher ratios, though 5.1 is somewhat hampered by needing to shift all the time. At high speeds, 4.1 is better as you're able to sit in 4th up to 120 mph, whereas all other FDs are in fifth. The early few numbers are intended to be typical overtaking scenarios - sitting at 25-35 in 2nd and accelerating up to NSL speeds (ish). The shorter drives are definitely better here, though the ability of the 4.1 to hit 75+ in third helps for the faster 45-75 sprint. 60-100 and 60-120 are interesting track figures as they're fairly typical of coming off a third gear corner and accelerating down a straight. Overall I think 4.556 is the best compromise choice for me, pity the Cusco one is so overpriced compared to MFactory.

New graph! This one has a comparison of 0.25s shifts vs 1s shifts. Also it's using dyno numbers from my car. Nothing too surprising, the main thing is that shifts costs you way more than a FFD saves, so if you're introducing a shift, it's going to be worse than otherwise. This tends to favour longer ratios as you have to shift less often. So for instance 50-80 is much quicker with a 4.1 FD as you can hit 80 in 3rd; with the other options you have to upshift in the 70s. 30-60 is interesting as there's a shift for all FDs (except 5.1) but it shows the advantage of staying in lower gear longer.

Nope, much simpler than that, just F=ma on the tractive effort. The numbers are very optimistic relative to actual performance, but they should be comparable (all drives have equal rolling / aero resistance so it doesn't matter if they are factored). I'm using stock torque figures, I have considered plugging in some dyno numbers, but that makes it much more car specific. I may give my car's numbers a try though. Shift times make fairly minimal differences - there's only a few instances where there is an additional shift with one FD vs another (10-30 with 5.1 is an obvious one, as is 30-60).

I was interested in this, so I did a few calculations of acceleration over various speed ranges for the different final drives. There are a couple of simplifying assumptons: no wheel slip, all tractive effort is used to accelerate the car, car mass of 1240 kg, shift times are 0.5s. There's a lot less in it than I expected, across a variety of acceleration scenarios. Something I didn't graph that's interesting is that the fastest setup for a 40-80 pull is 4.1 final drive as you can do it in third. It;s very slightly faster than a 5.1 FD in fourth over those speeds.

Reverse lights should be on regardless of handbrake.

Did you notice much difference from the GT3 brake ducts?

Bumpy section, downhill into cascades (left hander in the middle of the circuit)? Or maybe down the hill into knickerbrook (right left chicane)?

They offer a 10% club discount (might be for the other forum) which helps.

Mine were under £800 from Amber.

I think the next closure is early March (for the opening of the new link road, hurrah!)

Small world, I live in Northwich, never seen another gt86 here though, I'll keep an eye open for you.

There's roadworks near the airport tunnels, don't think that it will be a problem though (we turn away from the roadworks).

Only things I've used on a track day: tyre pressure gauge and pump, gaffer tape. I like to carry a few things like a spare set of brake pads, but that's definitely not essential.

Good points. I've had one flat, which was ~4cm tear in the sidewall and thus not repairable with the gunk. Luckily it was mid-afternoon so I just got towed to the second nearest tyre shop (the nearest didn't have any 215/45/17 tyres). Would have been a real pain if it were in the night though. Out if interest, @Riceburner is the foam insert there available separately for a non-crazy price? If it's similar to the Aygo cone price it might be useful (though the storage space without it might also be useful).

Any idea which ones fit? Also what's the best bet for bolting it down?

I want a spacesaver wheel, not a forged alloy.

No ritzy carbon fibre wing for you eh @Mike?

Does this mean a space saver from the kouki could be ordered for the zenki cars, and fit? That said it would probably be prohibitively expensive.

Going for this I think: