1198r

Hyperthetically.....

Assuming same driver laps a track in a gen 2 RS street car with the road tyres but has set car up properly and then does it in a race set up Cup car - how many seconds quicker is the cup car? Assume track length is 4.4km long, its a beautiful sunny day and the driver is a racer and therefore knows what he is doing.

I am trying to guage how much quicker a Cup with slicks is. If you want to get really clever, you can classify 996 Cup, 997 Cup, Cup S, 2011 Cup S and 2011 RSR!

CRex

My home track is 4.3km. Gen 1 GT3RS runs 1:50-52 on DOT R-Comps. GT3 Cup on slicks is about 1:44-46 and a GT3R clocked 1:41 yesterday there with room to spare (damp track).

aussie jimmy

i'd say a 997 cup should be about 9 seconds quicker.

just keep in mind that you own one of the best road cars in the world.
it is nice to drive to the track, have fun, then drive home, in comfort.
cup car is a totally different ownership proposition. it takes more than 2 to tango...
you need crew plus a great deal more expenses. and you can't drive it on the road.
once you start taking your car to 10/10th's, you'll know if you want to do it or not.
no need to rush into it. enjoy and grow with the one you have.

Z06

Sebring, 2.06x vs. 2.19, 12 sec
Mosport 1.22. vs. 1.32, 10 sec could be more when we see the 10 cups.
And the Street Gt3's had better track tires and some kind of mods.

va122

put slicks on your GT3RS

Izzone

Won't that tear up the suspension ?

va122

not really. I've done it. You may need to go monoball.

va122

Porsche did it for the RS that raced the 24 hr at the ring when Walter Rahl was driving.

NJ-GT

I like Sebring a lot, a 3.7 miles long track, and with only 2 days there I have come to realize why so many race teams from multiple countries come to Sebring to perform pre-season testing.

Sebring has a variety of conditions, except elevation changes (unless you call T17 elevation changes). Very technical track.

The very best GT3 Cup drivers were there this past weekend at the 2011 ALMS 12 Hours of Sebring. Fastest qualifying laps from the 2011 GT3 Cup were in the 2:07 range. The fastest 997 GT3 Cups using the 3.6 engine and less aero (2009 and older 997 GT3 Cups) were in the 2:11 range a few days ago running IMSA. The fastest 996 GT3 Cups are in the 2:13 range.

Peter (Trakcar) in his 2010 GT3 RS has lapped in the 2:19s on Toyo RA-1. If he runs the same slicks the guys are using in the GT3 Cup, he could drop to the 2:16s range. A Pro driver in Peter's car could drop another 2 secs (at most, I think), dropping to the 2:14s range (right there with the 996 GT3 Cup best times). On stock tires (Michelin Pilot Sport Cups) the 2010 GT3 RS with a Pro-Driver should not be able to break below 2:19s, or 12 secs slower than the 2011 GT3 Cup.

The difference per minute can be between 5-7 secs when comparing the Cup to the street car (bone stock), depending on track layout. A track with too many high speed sections (Daytona, Nurburgring) would mark a 5 secs gap, while very technical tracks with more turns and less flat-out straight sections can put a 7 secs gap between the Street and Cup car.

For instance using the 5 secs rule, at the Nurburgring the 2010 GT3 RS has lapped in 7:32, so a 2011 GT3 Cup should be able to lap in the 6:55s range, and that's about what they can run there, a few clicks below 7 minutes.

thusly

At my home track (Spring Mountain) on the old 3.1 mile configuration and my driving:

Baseline: '09 997 GT3 Cup (on Michelin slicks):
- 8-10 seconds faster than an 997 GT3 RS (on Hoosiers)
- 2-3 seconds faster than '05 997 GT3 Cup (on Michelin slicks)
- 3-4 seconds faster than 996 GT-3 Cup (on Michelin slicks)
- 12-13 seconds faster than highly modified race Boxster (3.4 liter, 2650 lbs, hoosiers)
- 16-18 seconds faster than Mercedes CLK63 Black Series (on Bridgestone Street)
- 25-26 seconds faster than Spec Miata (on Toyo RA1s).

Haven't timed it, but 996 GT3 RSR (without restrictors and Michelin slicks) should be 3-6 seconds faster than '09 Cup......

And about 10 seconds (or more) slower than V8 Radicals!

1198r

Excellent information - thank you.

I am currently 12 seconds off a 997 Cup car so I think I am heading in right direction.

1198r

Interesting reading indeed.

What do you think 2011 RSR would do?

TRAKCAR

I agree with Rad, he is much better with numbers than I am

A few thoughts; Sebring specific.
Driving with some good drivers on MPSC I guess that although Toyo is R compound, but no faster then the OEM MPSC.

An RS on Hoosiers will do 2:18's already, on a cold day maybe 2:17's. I figure 2 secs faster at Sebring.
This weekend it was 80F so the CUPS could probably go 2 seconds faster in cold weather?

In warm weather bone stock with a pro I think and RS could still do at least 2:18. Probably 2:17.
In warm weather this weekend the fastest CUPS with pro's ran 2:07's.
10secs max. As thusly says.

In my car I found that every 100lbs less is 0.5 -0.8secs less.
4 seconds for slicks
2 seconds for sequential
2 seconds for aero
2 seconds for 400lbs less?? Not sure..

NJ-GT

This weekend at Sebring, the 2011 (new) GT3 RSR qualified in 2:02.334, faster than the F458 Italia ALMS car but slower than the BMW M3, ZR1 and Fiat F430.

So, the RSR is just 2.5 secs faster per minute (5 secs faster at Sebring).

911SLOW

Stock springs of any street car (RS included) can't handle full slick tyres.. you can't take the full advantage of the much higher generated grip..

Porsche changed springs in the 24h ring car.