Jean

Very cool Karl Tell us more about the conversion!

Looks like your front fenders are wider but front bumper still turbo. No perceptible front aerodynamic lift issues at the track?

Randyc151

Yes, Karl, besides the very cool new wrap, tell us what you used for the rear wing, and is the front stock?

I'm still trying to find a good solution for more HP on track. Do you guys have any real feedback on ECU tunes for track use? We get plenty of dyno numbers, but I am hoping somebody has real world lap differences they can share. I made an offer for a GT2 RS today, but if they don't accept it, I need to be able to run with it! Tire and HP to start!

pepinozaur

I might have some data, hope it helps you to get an idea, these are my times on our local track where I managed
1:50.1 OEM tune, cup2 265/325
1:49.1 stage2, cup2 265/325
1:47:8 stage2+Torco, cup2 265/325
1:48.1 stage2 + IC, trofeo 245/305

991.2 gt3 245/305 Trofeo does low 1:51
991.2 gt2rs 265/325 (WIDE!!!) trofeo did mid 1:47, but still has potential to go faster as driver isnt still 100% comfortable with the car

Definetely car heatsoaks in the heat without ICs, I had vbox in the car and performance wise (60-130, max speed, etc) car ran better with ICs.
I still think a meth kit will do wonders, I dont know if you have seen the pic with the gt2rs clubsport running an off the shelf Aquamist pump: https://motoiq.com/la-auto-show-2018...iew-porsche/7/
LOL, I was expecting better from Porsche, or at least congrats Aquamist.

Considering the EGTs are better with the bigger turbine of gt2rs, better compressor efficiency, bigger IC&ducts etc and still using an aquamist spraying system, seems a good choice for us to spray directly into the intake as should will yield even better results, than spraying only on the ICs.

Jean

I have tons of data Randy, I ran my car with all stages of tune and now I am on stage 4 with Methanol. If I was not doing time attacks, I would definitely settle with a Cobb tune and exhaust only. No intercoolers and no turbo upgrade. Suspension of course. For the last tenth, yes a stage 4 with meth and suspension work is amazing.

I also ran with Cup 2, Hoosier R7, Trofeo R and Pirelli slicks.

I never ran against a 991 GT2RS still but I suspect I would be even or maybe 1 second slower on a 4 mile track if it was driven by an experienced fast driver.

Randyc151

The dealer didn't accept my offer...but another dealer 90 minutes away did. Stay tuned for several announcements, or read my sig.

Bruce H.

Congratulations Randy...that's awesome! Just a stunning car. I'm sure you'll love it!

I know you were planning to further developing your Turbo S to run with them...what was the key deciding factor(s) that pushed you over the edge?

I'm sure you've helped inspire many current owners, and new ones like myself, to pursue tracking their Turbos. Thank you for sharing your passion...and don't be a stranger here!

Cheers,

Bruce

Jean

Some interesting lap times from a private event on the Bahrain F1 GP track 5.4kms..

Drivers in the top 9 cars are mostly semi-pro drivers (Porsche Cup Challenge, Supercup, 24H endurance racing experience etc..).

All cars are stock to my knowledge.

For reference Pro series 991 CUP cars are in the 2:03-2:04s.
The 720S is unbeatable.

Mc Laren 720S: 2:08.7
Mc Laren 720S: 2:08.8
Mc Laren 720S: 2:09.1
991GT2RS: 2:09.x
Mc Laren GT4: 2:09.9
Radical SR3: 2:12.5
991 GT3RS: 2:13.6
991 GT3RS: 2:13.7
F430 Scuderia: 2:18.0
991 GT3: 2:19.3
Ferrari 488 : 2:19.9

nolimits

Good post, suprised to see the 488 so low. Wonder how 720S did at the ring. And for some extreme comparison, Vettel qualifying this year was a 1:27.9.

Randyc151

Different cars excel at different tracks, and finally there are fast tires for the 720S. This is all within the range of what I'd expect on any given day at any given track. I did expect better from the 488, but we don't know other variables

Jean

nolimits

Jean what kind of times have you seen with your stage 4 and slicks or R7s ? Must be right up there.

Jean

nolimits

So true, amazing era right now for performance driving enthusiasts, the OEM cars these days are phenomenal. The comparisons are interesting for sure, but I must admit to some old school heritage and satisfaction. Take a car for less, build it yourself, challenges and all, have some seat time, and drive by the bigger budget OEMs. Media if you’re going to do a 2RS vs Cup car comparison, at least put slicks on the 2RS also and make it interesting. Ah real world problems, maybe time to buy a LaFerrari, values are going to come down right ! Jean nice ride, I’m looking forward to a big build once I can find the right road course cooling solution.

Bruce H.

That is very impressive! Can you confirm that the limp mode was from over-heating?
Glad to see the general interest in finding cooling solutions for road course use because providing adequate cooling really is the first priority there.

Jean

I agree with a lot of what you said, I enjoy having at home one older model P Car and modify it heavily to enjoy it on the track beating the fastest out there, while still is a daily driver with full interior and AC running during a race. It is not as much fun racing a 2300 lbs 997 GT3 RSR Turbo and competing against modified street cars.

I am afraid the 991.1 in 2019 is done, with the newer cars, even when modified like I have. Until now, the 650S was within reach, heavily modified 997GT2s also, unless taken to extreme levels as well (non VTG, slicks, wider track , Cup wings, etc) . I am not as worried about the 991 GT2RS, it can still be matched or beaten if I decide to reduce weight on the 991.1 or maybe go for a fixed wing and front splitter, but a simple stage 1 720S is out of reach. We will know more in February during our Region's most competitive Time Attack race of the year in Bahrain, which my 991.1 won last year.

Unless one goes with improved fueling, non VTG turbos and other hardcore mods...but I am not up to taking the 991.1 platform any further.