I'll be paying attention; at this point I'm considering either the custom lexan pces outlined in that other thread or I may just delete the forward sensors as I don't really feel I need the front ones and it significantly simplifies things.......just not sure if unplugging them will generate an alarm or not.

At this point my wife is planning a solo trip next month leaving me 3-4 days of uninterrupted garage time......I'll keep you posted with whatever I end up doing in case it helps someone or I beat you to the punch.

Cheers,
Dave

 

Thanks!

 

So, since I have a 2016 F-Type R AWD vehicle, I have decided to keep tires with the same rolling distance between front and rear - so OEM 265/35 on front and 295/30 on the rear provide the identical rolling distance.

However, if I owned a 2015 without AWD, and with the known tail-happy reputation, I would HIGHLY recommend going to a smaller front tire and increasing the grip on both. I would surmise that it would dramatically change your confidence in the car near the limit.

The stickiest "streetable" tires out there in my opinion and available in Porsche sizes are 245/35/20 and 295/30/20 sizes. These sizes would add a bit of understeer which is considered more desireable than oversteer which can cause spins.

Fastest to slowest...

1. Bridgestone RE-71Rs
2. Dunlop Sport Race Maxx
3. Michelin Cup 2s
4. Pirelli Tropheo R
5. Continental ContiForce Contact

On a 2 minute track circuit, these tires would be 6 seconds faster than the Pirelli PZeros, and 3 seconds faster than the Michelin Sport Pilots. An additional benefit of the Re-71s, is they will be about $500 cheaper for a full set.

My main reason for posting this is to say that the car will handle much better with smaller front tires, and at the same time be faster and less likely to spin if you switch to a softer compound tire as listed above.

Choosing to go to 305s in soft compound for the rears would likely even bring more confidence IMO.

 

I don't know how the Euro plate possibly gets a pass. In Portland it would be an instant ticket by an overzealous cop.

 

Imo it's too much tyre bulge/ballon from an aesthetic pov vs the fronts

The 295 mpss fry so easily that I doubt +10mm would make any difference to offset the bulge look and wrong rolling diameter

295 Mpss

 

The extra 10 mm of tire would make straight line wheel spin worse anyhow. Gotta go taller for more rear grip.

 

yeh there's definitely a lot more to adding grip than just adding width

a 305 is best suited to a 11" or 11.5" width wheel (even though they do physically fit on a 10.5") but that extra sidewall bulge on a 10.5" isn't necessarily translating to actual contact patch or lateral loading - not to mention the sidewall rollover/flex while powering down with longitudinal loading

there is a very real science in determining correct tyre vs wheel size, and i best leave it to the experts

we all know the oe pirelli's don't offer the most grip, or comfort, so switching to mpss is always going to result in more grip regardless of choosing a 295 or 305 - the soon to launch (literally any day now) michelin ps4s will be even better in this regard

 

Michelin introduces the PS4S at 2017 Detroit Auto Show

They will be available in March at the earliest.

 

Adding width doesn't increase contact patch size. It only changes its shape. And the shape change added width results in is worse for preventing wheel spin than what you started with (all other factors being equal). The is the single most misunderstood fact about vehicle modification. Every time someone adds a ton of horsepower to a vehicle they slap some ridiculously wide tires on their car thinking that will help with wheel spin, when its actually making things worse.

Check out this contact patch calculator:

BND TechSource - Tire Data Calculator

If you want less wheel spin, try to pick a tire with a higher contact patch length. If you want to reduce over-steer, pick one with a higher contact patch width.

 

I think you missed a "mis", as in misundertood vs understood!

 

Fixed!

 

Yes. That is exactly what I have done. I changed to the same sized tires as on the SVR, 305/35R20 rears Michelin P4s, and 265 on the front, on my V8S. Absolutely no problems. However, buch better traction and looks so much better too.