yell03

I have a 2015 991.1 Turbo S Cabriolet.
Only mod which is on the way is a Speedtech 2.5" x-pipe without mufflers and reusing stock cats and tips.
Would a Stage 1 tune put me at the 130 trap speed I desire.
I have a dragy, but I have only done 0-60s, best was a 2.91 (2.73 with rollout).
Tunes considered are GIac Stage 1 or a Cobb Stage 1 from a local tuner.
I love the car, I just want performance equal to a stock 991.2 TTS.
I have already added carplay, couldn't live without it.
Other thought is a Stage 2 tune with high flow cats and maybe intercoolers.
I am still under CPO for another year, so no immediate rush.

BMS

Sounds like the JB4 is what you're looking for. Simple PNP device that will give you a bump in power depending on which map you want to use.

https://burgertuning.com/products/po...3a12fc8e&_ss=r

-Payam

yell03

I looked at the JB4, I liked it, but I think the Cobb and GIAC through the OBD port seems easier.

991TurboTim

A little "secret" that I don't know how much of a "secret" it is .

I have only launched my car a handful of times but it seems like the 1-2 shift is a bit harsh (there are threads on this). In the past I have always left the car in drive and let it shift itself.

The other day I took of from a dead stop (non launch) and had it in manual mode and shifted 1-2 manually (with the gear-shifter) when the tach hit 6K rpm so it likely shifted at 6,200-6.400 versus red-line.

The result was no hesitation and a very crisp shift from 1-2. The car felt significantly quicker.

Although I haven't launched the car trying this my guess is you would have the same result from a launch and be good to shave off few 10ths and some add some MPH.

After the manual 1-2 shift at 6K RMP I move the gear shifter into drive and let the car do its thing.

Would be interesting if some folks with Draggy's could try some 0-60 runs using this method described above for real world comparisons.

Rausky

Those are reflashes though, no? Depending on if you care about warranty, a JB4 doesn't flash the ECU meaning your warranty will still be intact if something breaks vs. a flash tune.

yell03

My car shifts great when launched in "D" in sport plus mode (launch control), I couldn't do better myself.

The fact is, even if the JB4 doesn't leave a trace. if something went wrong, Porsche NA would be able to see higher levels of boost and other things outside the normal range and know it was running some sort of tune.
At this point it becomes almost like insurance fraud and I would not lie and say it was stock.

neil.schneider

Those are the same times that my car does. I have a 2015 cab as well as you can see. I don’t think the exhaust that you did adds any performance unless you tune car as well.

yell03

I did not put the exhaust on yet, still waiting for it to arrive.
I do not expect the exhaust to add much on its own without doing cats, I just want the nicer tone.
With a tune I don't even expect it to add much maybe 10-20hp max.
I think the cats are the bottleneck and I will not go catless.

BMS

JB4 is undetectable once removed. However we don't encourage warranty fraud, so pay for any damages that may occur while running outside factory parameters.

-Payam

myfirst63356

Sam By Design tuned my 991.2 Turbo (with Fabspeed exhaust including cats) using Cobb and a Mustang dyno at World Motorsports. I now have 525 HP at the wheels; with a conservative drive train loss of 15% (some would argue up to 20%), this means 620 + or - at the flywheel. Compared to my stock 540 HP, this is an increase of 80. Likewise, torque is at about 720 foot pounds at the flywheel. As added pluses, Sam tuned my car for our hot weather in Tucson and our 91 octane gas. Finally, his curves over the RPM range were much smoother than those I had during the baseline run.

yell03

Good information, thanks

That sounds pretty solid for simple mods, thanks