Veloce Raptor

Agreed.

And agreed.

And I remember that--I was there. Pitiful.

wanna911

You should have the TTU record now huh? I think it was a 2:18 something before.


I passed a 458 challenge at Road Atlanta at a Chin event, was probably the same guy as I don't think many people driving those at regular events, and I'm pretty sure I remember this one having Florida plates on the regular old enclosed trailer he pulled the car off of.

mdrums

+1....I ran Homestead for the 1st time back in February...and the Freedom Autosport Grand Am team was testing during our Chin event. That Mazda MX5 was all over me in the corners. I'd point them by for a series of tight fast corners, catch them in the straights or sweeper maybe get pointed by only to point them by immediatly after that. Of course I believe they had pro drivers testing and one of them I was told was Guy Cosmo....not way I can out drive those guys....lots of fun being on track with better drivers though.

wanna911

Freedom Autosport has been one of the leaders in it's class in Grand-Am, you have nothing to be ashamed of with that. ALL of their drivers are REALLY good, and on a track like homestead, they will eat a lot of people up in those tight corners.

That's a little different. Jack Baldwin ran a Cayman Interseries car in a DE last year at Road Atlanta, whatever group they put him in, he punished everyone in it.

fc-racer

You are not wrong. I have reams of data supporting your observation. I've tried 235 19" MPSC, 255 18" R888, 245 18" RA1 and the MPSC produces consistently less braking G's. The only place the MPSC is better is in lateral responsiveness (S curves), but not enough to make up for the loss under braking and overall cornering speed.

mdrums

Yep, it is way to easy to get deep into ABS on n-spec 235/305 MPSC. Maybe the 245 fronts will help....it not I might try out the Pirelli Trofeo next or just go back to 18" and R888 in 255/315 sizes.

Nick Wong

Hmm.

I found front grip vastly improved with rake adjustment. Play around with ride height and rake.

Tires are always a compromise. What's good for the track isn't necessarily good for the street. Most R compounds really like a lot of camber on the track, and believe it or not, most street tires like EVEN MORE camber on the track because of the softer sidewalls. My car does not have an aggressive alignment- it is more than OEM but not off the charts like a race setup- it is a street car that happens to go pretty quick on the track.

We've discovered (keeping in mind this Porsche is my first so I'm by no means learned on them) that the stiffer the rear, the better the front (up to a point of course). You need front bump compliance but no porpoising- so ideally you would want 4 way shocks up front, or at least very, very well tuned two ways. With 4 way shocks you can chase the shock degradation as it wears, but with a 2 way you'll need to rebuild more often.

Another thing we did is increase the front tire patch. With the Guard GT2 diff we were severely pushing into turns and no matter what we did we would encounter push at some point. A bigger front tire alleviates that to some degree.

The third thing you should be aware of is wider tires are not necessarily better. Scrub radius is completely ignored on forums because most weekend warriors don't even know they are affected by that. Reducing scrub radius is super, super important if you want to allow your car to roll through the turn with minimum drag- drag which most people think of as turn in understeer.

I don't know if I helped you on this issue. PM me if you have any questions!

edit-

The other thing I can think of right off the bat is to swap to a non-N spec Cup. There should be more contact patch. I found the N spec rears to be almost too sticky relative to the fronts, balance is out of whack.

mdrums

Thanks Nick...well my GTS is no where near this adjustable. I am running -2.5 camber front with .5mm toe out and -2 camber with 2mm toe in. Also my caster is adjusted as much as possible with out rubbing the fender liner.

What I noticed is I have to wait longer to get on the power at or after the apex with MPSC compared to the R888. Rear end grip on both tires seems closer to the same but the 235 MPSC front push/understeer if I get on power at Sebring where I'm use to. Also I've had to adjust my brake zones because the MPSC will skid at activate ABS much easier than R888's.

wanna911

Have you tried the non N-Spec MPSC? Or do they not make them wide enough for the rear of your car? I LOVE those tires!

jenk12m

Nick, what kind of lap times did you get around Sebring

NJ-GT

Put a 265/30R19 MPSC on your front wheels, and run the 325/30R19 n-Spec from the GT3 RS 3.8/4.0 and GT2 RS. You need adjustable sway bars to keep the car balanced.

Your alignment is fine, don't change it.

On MPSC, my data showed me laps in the 1:59-2:00 at Daytona, I can live with that. I ran 265x19 and 345x19 both of them race spec MPSC. The 345 is too fat for your Carrera GTS, but the 325 n-spec is fine.

NJ-GT

I timed Nick's GT2 at 2:29 at best with my iPhone from my garage, but no idea what the best laps were, as they had traffic, and conditions were really bad (low grip, high humidity, and very hot).

Gavin was there this weekend, with the 997.1 GT3 RS, a car where he ran 2:14s in February on slicks. He was doing 2:22s and up the few times I timed him this weekend, the car was on Michelin slicks .

Nick Wong

Rad has us pretty close, but we never got a clean lap. If you saw the "fast" guys and how much we were tailgating them, you would understand. I would think a fast lap would be significantly quicker, like knock 15 seconds off, and a lap with lower ambient temps on Cups, look out!

A DE is only for education, and we weren't going to try to beat anyone into submission... since the traffic was bad we ended up testing sectors, like track out, brake zones, etc. A high speed wiggle before apex on throttle application at 120mph is an eye opener!

85Gold

That is why I still run street tires mostly unless I am running TT. Still one way to make Hoosiers last is don't push them and the won't cord so you can brag about 50HC Hoosiers.

Peter

Nick Wong

That's about right, if you can play around with rake that would be even better.

Those Cup tire sizes are what I want to use up here for Road America. Should be quite a good ride!