But the Mas sure did sound fast

And your 991 TTS had a disadvantage -- it's a cab

 

First of all, thank you Scott (SDG) for inviting us and helping organizing the event. It was also great to finally meet Jon (jyupitt1) and Chris (ecpChris). You guys rock!

Now regarding the times, I really really REALLY think SDG and my car are essentially even. His car had the fastest trap at 132, while mine hit 131.92. Splitting hairs. His best time was 10.31, while mine was 10.36. So technically SDG has the faster car (with me driving ).

Now, as everyone who was present can attest, traction SUCKED. I mean I was able to hook up and launch MUCH BETTER on the street after the event than I could all day long. The stock Pirelli tires on my car are really bad. I don't understand why Porsche still sells cars with these crappy tires. What am I getting at? If I had MPSS or MPSC tires, I am positive I would have gotten better times. I know thats speculation, but keep it in mind.

Secondly, the DA today was unusually high. Its much lower tomorrow, and was much lower yesterday. Oh well. That explains the poor trap speed for everyone

Thirdly, I personally did over 40 runs in my car. OVER 40 RUNS!! I would estimate I did at least 3 rounds of 8 runs back to back. And my times ranged were always between 10.37-10.44, terminal speeds always between 130-131. No heating issues. Very very consistent. Consistency which felt stock. Why the hell would I run my car that many times back to back, knowing it couldn't possibly help my times?? NO HEAT SOAK. Now I know for sure.

Finally, as some have heard, I filled up gas in the morning and the gas attendant (in NJ we are considered too "stupid" to fill our own gas, so an attendant has to fill it for us) filled 5 gallons of regular when I realized it and stopped it myself. I added 6 gallons of MS109 at the track to balance the octane and ran the 93 octane tune. When the reserve light went on, I filled up another 6 gallons and switched to the 100 octane tune. Oddly, my times and speeds didn't change at all. I don't know why, but they didn't. I only assume it was because my traction issues only got worse with the extra power. The car did sound different, a little raspier.

Regarding videos, Scott has a video of my car vs his lined up during my best run. I'm sure he'll post it. It should show me pulling away very slowly, if I remember correctly. What does that mean? My car can't be slower. That's why I really do think they are very evenly matched. I have some videos too, haven't checked them, but I should have some against Jon's cars.

Now the best part: We exchanged ideas, and traded tire pressures. I wanted to drive Scott's car because I could see him having a horrible time launching his car. I finally asked him to let me try, and did 2 runs. First time the car short shifted into 2nd gear, but the launch was great. Not sure why it short shifted, but it did. Second time, it launched perfectly and got the best time of the day, I think. As far as I'm concerned, this should finally end the idea that there is any animosity or angst between any of us 6Speeders. I wanted to help my friend get the best time out of his car, and I did my best even though it would mean it would beat my time.

Now finally, as far as I am concerned, these numbers and times and data etc mean one thing: Both cars are F'in fast! I am extremely happy with my Cobb and I think the Europipe exhaust sounds sexy. If I can have an even matchup with Scott's incredibly fast highly modded car by only having a tune, that's all I can ask for!

 

No one checked my frunk!!!!

 

Thank you for the detailed review!!!
What was in the boot?
A pizza I hope

 

Right on the money. The cars were within a hair of each other. Not statistically significant differences.

 

Maybe all the bolt ons are the problem? There is no proof this stuff actually works, To bad Robs car didn't make it he's got the Cobb with bolt ons right?

 

The bolt ons are not the problem. My car is a lot faster and more consistent at stage 2 plus with IC than before. Before the ICs my car would have one fast run at speed events and then slow down big time in the subsequent pulls. The car was literally like two different cars with trap speeds falling 6 mph and ETs rising by a half a second. I have posted those results

Now the car is super consistent without goal soak. My own best run of the day was in the afternoon and was not my first pull but rather was a back to back run. Totally different car now.
My biggest problem was the mods make the car so much more powerful that it cannot launch with Pilot Super Sports in 50-60 degree weather. Only when temps rose into the 70s did it hook on launch. Of course when it rose into the 70s and was humid the DA went way up which hurt results for everyone. But for me the extra traction meant reliable and repeatable 10.3 passes. Car would have done even better if I could have launched in the cooler air. Car needs r compound tires to do that.

 

This is a great thread. Thanks for taking the time to document all the results. I wish I could have been there and that there would have been a GIAC stage 2 car with exhuast and a Cobb stage 2 with exhaust TTS comparison, and a stock TTS against a GIAC stage 2 car versus a GIAC stage 2+ car with full bolt ons.

I think most of us are looking for what the incremental improvements are for each stage of these mods, and who's tune runs the best and produces the most power.

The last point I wanted to make is at my last airfield race day, I had about 8 races in a 3 hour window, including when Longboarder and I raced, and my runs got faster and faster with my last race against Longboarder being my absolute fastest. I never noticed any heat soak whatsoever. Not sure why. It was a hot California day and I did absolutely nothing to cool my engine between runs. I was running GIAC stage 1 with GMG 200 cel exhaust and 100 race fuel. My last run was dead even with Longboarder at 166 mph in the half mile.

From the data I've read so far, the Cobb tune is either stronger than GIAC, or as it has been said, the GIAC stage 2+ car has so much more power that traction became the defining factor.

Lastly, too bad it wasn't a 1/2 mile roll race where you could have eliminated traction as a factor. That would have told the real story. We have our airfield 1/2 mile races coming up in a couple of weeks and I plan to run my car with the addition of GIAC stage 2. I'm hoping that there are several 991 there with Cobb tunes and various other mods to see what the actual differences are. I'm not prepared to go any further with mods unless I see a significant difference in performance without sacrificing the incredible drivability of the Monster TTS.

 

Any time. I wish we had had more GIAC cars there (a stage 2 was coming but then cancelled) and a Cobb stage 3 car that worked (the one there was fresh out of the mod shop and I guess it needed some sorting out) and a stock 991 TTS. But we did have two Cobb stage 2 cars that were working well and my GIAC Stage 2 plus. I know it is tough to get people to go on the weekdays

I wish we had half mile airport events on the northeast. Sadly there are none. The closest one is like 400 miles away in western Virginia at a trap killing altitude of over 4000 feet (the wannagofast event).

As far as the Cobb stage 2 my tune was a bit stronger but not by much. My traps and ETs are better but not by much. Was something to see a car go so fast with only a tune and exhaust

 

So being that a TT can be tuned for the cost of the Cobb tune and exhaust, one can skip a TTS and save 30K if they are okay with a modded car... of course if you want PCCB, PDCC, etc., prob best to just buy a TTS....

Interesting, how much lighter is a TTS than a TT with steel brakes? Does this come into play at all in the 1/4 mile?

 

Great points. Unfortunately traction was an issue for us both.

SDG should have the video of our run, my best run of the day, to see how the cars act. If I remember correctly I got a better launch and continued to pull in the 2nd 1/8th. That's why I really do think they make equal power.

Maybe SDG can organize a roll race in Mexico

 

If you track the car in addition to doing 1/4 mile races you will find the S to be the better car due to the ceramic brakes.

 

Don't want to derail this thread, but track rats usually take the PCCB's off the car. I have PCCB and do wonder if the PCCB's can hold up to 100K including multiple track days.... different topic for a different day...

My point was not about the brakes.....

 

Find one of my COTA threads and we can talk about it because no one I know takes ceramics off at the track.

 

On the 997.1 and 997.2 cars it's very common practice to remove the PCCB's and set them aside until it's time to sell the car. Most people did this because the replacement cost of the PCCB rotors is so astronomically high. So if they tracked the car a lot, most people didn't want to risk damaging them.

For the 991's, the size of the rotor makes it a bit prohibitive because you'd be adding a TON of weight to the car by doing it. As far as I know, no one has really come out with a good replacement alternative for the PCCB rotors on the 991 Turbo or GT3.