Bob Rouleau

Hmm, it looks to me like the car understeered on initial turn in, (turn, turn much more) then a lift off the gas to rotate (over-rotate) the car. Nice car control though.

TT Surgeon

I'll buy your car Ron !

mooty

THINK dont brake, and you will brake late enough to be fast

Carrera GT

I think Moot is saying braking in the little Lotus is like mixing the perfect Martini, you don't add Vermouth, you just think about it and that's enough.

Apex Late

I don't have the max figure but the min figure from the measurement points underneath the car are 93 mm front and 118 mm rear. That represents a drop of 15 mm from the stock settings

grussell

^ Thanks! Where did you get those specs? Are they from Porsche?

Apex Late

No I got the max 15mm from a race tech. Kinda on the QT so I wont mention his name or his teams name. Lets just say they have won a few races.

Bob Rouleau

Doc - it is my understanding that toe in at the rear also helps to rotate the car. I went zero in front and 16 mins a side in back. Neg 2.5 in front, 2.0 rear. Rotated the struts and caster is 8.5 deg. It worked he car handled very nicely. No oversteer and just a smidge of understeer. Felt the same as my 996GT3 only I was a second a lap faster. Considering the N spec tires have less grip than the 18 in Cups, I was pleased!

Note that this is basically the 'circuit' set up in the manual except that I have 0.3 deg less camber in back and a half degree more in front. Now looking for some 18 inch wheels!

Best,

cleanme

What about those Dymag rims that are carbon fibre&magnesium? They're frickin light but standing up to track duty? I'm not sure.

Carrera GT

Right. Good point. I've noticed the wear on the Sport Cups (running mostly in "Sport" PASM with the "circuit" alignment) suggests more camber in the front (so I was going to add a half degree) and if that worked it would also change the rear behaviour. Once I got a new handling characteristic and new wear pattern I'd hope to avoid more rear camber for two objectives: better wear on the street and a more "pointy" handling nature.

DrJupeman

I don't understand the bitching about "out of the box" understeer. What street 911 from the factory has not understeered for the past 30+ years?

Nice vids earlier.

frayed

Bob, the 18" MPSCs are smaller diameter than stock I think. You can run Toyos in near factory diameter. I think Noble had some issues when he went to the 18" MPSC setup on his 997S. Food for thought.

Stock
235/35-19 25.5"...............................305/30-19 26.3"


RA1
245/40-18 25.6"...............................305/35-18 26.3
275/35-18 25.5"................................335/30-18 25.9


PSC
265/35-18" 25.2"...........................345/35-18 26.2
235/40-18" 25.4"...........................295/35-18 25.2"
....................................................315/35-18" 25.5"

Hooters
P245/35-18 24.7"...........................315/30-18 25.6"

Nitto
245/40-18 25.55..............................315/30-18 25.35"

Bob Rouleau

Frayed - next week I am going to borrow set of 996 GT2 wheels with 235/315 18's. Front and rear diameters are very close to each other, but I am worried about the rears being 0.8 inches less than the 19 inch N spec. The fronts are "close enough" in diameter between the 18 and 19. I hope Noble will chime in here.

Best,

doc2s

bob,

great that you got the setup sorted out and that the car handled well. my experience with rear toe for mid/rear engine is that you need toe in for high speed cornering/braking stability at the expense of straight line speed and rotation. with a front engine car 50/50 weight dist. like a spec miata i use zero toe in the rear in favor of more roation since top speeds are "low" and not much braking is needed. my 2c.

Apex Late

I think that they would be great for the track. I had a set on order but they are having production problems that have caused some delays. I think that they may be getting the problem sorted out. But all in all I think that they would be great track wheels.