[ZuffenHouseRules]

https://www.cobbtuning.com/porsche-991-2-power-gains-with-accessport-tuning/

Cobb finally pre-announces their Accessport OBD-II flash-only tune for all of the 991.2 models incl. the 3.8 Turbo/S with VTG. These 9A2B6 engines all utilize the same Siemens ECU as our 9A2B4, so Cobb support for the 718 should follow soon.

Percentage gains in horsepower and torque vary a lot depending on the model -- which themselves vary wrt factory boost and turbo-size. So, difficult to infer any rule-of-thumb to project gains for our 718 engines.

Overall though I think these dyno charts hint at huge tuning potential in the 9A2B4 which, as a reminder, is essentially the same engine as 9A2B6 with two-thirds the block length and cylinder count. Specifically, the 2.0 resembles the 3.0 Carreras, while the 2.5 shares its bore/stroke and VTG with the 3.8 911 Turbo. The big wild card of course for all 718s being the single (larger) turbo versus smaller twins. More efficient air-to-water intercooling may factor in here as well.

 

[limniscate]

I rode in my friend's 718 Cayman base manual with the Cobb tune, and it felt very fast. Prior to picking it up we were in a 718 Boxster S PDK and it felt very close to as fast.

 

[Optical TDI]

Great news!!

 

[peaedvard]

It is going to be intresting to find out how many Hp and torque Cobb could get out of this motor, comparing to other tuners.
But i guess this turbos are maxed out in the 430hp/ 520 nm area, if you dont have any supporting mods, hopefully i am wrong.

 

[diegouruguay]

Hi, anybody knows something about this company tunning for 718 ? DynotechRS based in the UK. I´m planning on installing their tunning and Fabspeed Supercup turboback exhaust.

 

[CupraLeon]

Ehresmann in Germany offers kit, replacement original ecu and exhaust mods 450hp and 540Nm.

 

[johan]

Ehresmann in Germany offers kit, replacement original ecu and exhaust mods 450hp and 540Nm.

Jens is a bit pricey even for stage 1 without a new ecu.
But with his reputation you can
Also if your gonna track alot he does not not like to lift it over 430hp, to save the engine/turbo.

 

[CupraLeon]

Jens is a bit pricey even for stage 1 without a new ecu.
But with his reputation you can
Also if your gonna track alot he does not not like to lift it over 430hp, to save the engine/turbo.

Great to share your knowledge Johan, I only noticed your other posts on the subject after posting this Jens is a wise tuner to do so, I understand he Tunes the track Porsche's for nurburgring too. On the price: it is indeed hefty, but a new ecu is expensive. I am tempted to go for the full tune after a year or 2 of ownership. Now I am still six months away from delivery of my 718 so I have 'some' time to save the 'stage2' money =)

 

[Baka1969]

How will this effect long-term reliability?

 

[CupraLeon]

Couldn't say for Porsche, but all my other cars are tuned between 30 to 50 hp above standard and never had any issues. I drive them 'wisely' witch means, warm up and cooling down must be respected, not always driving under full load, quicker oil changes sometimes changing the oil grade depending on the weather conditions. My oldie nissan is still going strong after 230000 km's on the clock and my Cupra after 100000 km. Since the Porsche'ists always claim that they are very reliable I am willing to give it a chance. It also depends on the fuell quality and climate where you live. From factory there are always big margin's on an engine to make sure durability/reliability is obtained everywhere (country/continent).

 

[johan]

Great to share your knowledge Johan, I only noticed your other posts on the subject after posting this Jens is a wise tuner to do so, I understand he Tunes the track Porsche's for nurburgring too. On the price: it is indeed hefty, but a new ecu is expensive. I am tempted to go for the full tune after a year or 2 of ownership. Now I am still six months away from delivery of my 718 so I have 'some' time to save the 'stage2' money =)

We had a discussion in another thread on tuners and the numbers they present.
For me, if a tuner claims that the stock car have +50hp from factory i stop reading cause i dont se them trustworthy in any sense.
I dont trust the dyno they are using and i dont trust the tuner.......


Of all the tuners Jens is one of the few where before numbers is more in line of what 718 should have.
Together with his reputation in the Porsche racing comunity does it for me

 

[CupraLeon]

We had a discussion in another thread on tuners and the numbers they present.
For me, if a tuner claims that the stock car have +50hp from factory i stop reading cause i dont se them trustworthy in any sense.
I dont trust the dyno they are using and i dont trust the tuner.......


Of all the tuners Jens is one of the few where before numbers is more in line of what 718 should have.
Together with his reputation in the Porsche racing comunity does it for me

Totally agree, + 50hp with only remap and no other mods is not realistic (mostly they up the turbo pressure too much and don't respect the margins) The tuners I know in Belgium recalibrate their dyno every 3 months and will not promise figures but look what is possible and make sure everything stays in one piece

 

[ZuffenHouseRules]

@CupraLeon do they have track days at Spa? My favorite F1 track in the world.... I'd like to drive my 718 there for Historics race day, eat french fries with mayo and drink Chimay. Yum!

 

[johan]

Totally agree, + 50hp with only remap and no other mods is not realistic (mostly they up the turbo pressure too much and don't respect the margins) The tuners I know in Belgium recalibrate their dyno every 3 months and will not promise figures but look what is possible and make sure everything stays in one piece

No its worse, some say that Before any tune the 718 has 350hp at the wheels, that translates to +400hp at the crank, i just dont buy that!!
With a modified ecu i think +50 hp is possible, it comes down to remap it all, the VTG turbo on S is also tricky to map so it does not introduce alot of lag.

 

[johan]

@CupraLeon do they have track days at Spa? My favorite F1 track in the world.... I'd like to drive my 718 there for Historics race day, eat french fries with mayo and drink Chimay. Yum!

Yes they do, i have been there 4 times, its a h-ll of a track.
Nurburgring have it´s charm but since its a bit more like a open road you never know whats behind the next corner.


Public Driving Experience | Circuit of Spa-Francorchamps

 

[ZuffenHouseRules]

VTG turbo on S is also tricky to map

I'm skeptical that any tuner currently is actually re-programming VTG vane actuation in the ECU at all -- instead just treating it like every other fixed A/R turbo they've dealt with in past, effectively ignoring vane actuation and defaulting to whatever movements are in the factory program. Which can't be optimal for the tuned power curve esp. if the nature of ECU vane actuation is a continuous process loop making incremental adjustments at the micro-second level.

However even if above is true I admit to being puzzled at to why it presents as big gains in torque and average hp with minimal gains in peak hp at high rpm. Intuitively I'd expect sub-optimal results across the rpm band but esp. at lower rpm (thinking that vanes ought to be mostly wide-open at high revs?)...

Also I recognize one thing that argues against this theory: new Cobb 9A2 tunes for the 3.8 911 Turbo and S (with VTG) show better % increases in peak hp. Does this show they are indeed re-programming VTG vane actuation (in synch with boost and waste-gate dump cycle maps), or perhaps just that the big twin VTGs are less constrained by factory vane settings in the presence of increased boost? I *think* the solo VTG unit on 9A2B4 is the same size housing (maybe slightly different compressor wheel diameter) but it is blowing 2.5 liters of swept-area versus 1.9 for the twins, and with different IC....so very different dynamics possibly explaining different tuned behavior around peak rpm.

 

[johan]

well, i try not to think about it since it makes my head hurt
If one where to fiddle with the values it gonna take some time to get it right.
I guess all the tuners have like standard tune and when you get on a dyno they can adjust it more precise.

 

[CupraLeon]

@CupraLeon do they have track days at Spa? My favorite F1 track in the world.... I'd like to drive my 718 there for Historics race day, eat french fries with mayo and drink Chimay. Yum!

There are several organisations for trackday's at Spa, also free driving day's you can find them the dates on the site Circuit de Spa-Francorchamps On the Chimay Good taste you have! Belgium has a lot of beers and French fries you can get almost anywhere =)
Personally I do trackdays with skylimit events they do them several times a year @ Spa-Francorchamps.

 

[TEST DRyVer]

I'm excited to hear about these new tunes coming to market for our 718's! When the car was first introduced, available tunes were slim pickings.

 

[Baka1969]

Couldn't say for Porsche, but all my other cars are tuned between 30 to 50 hp above standard and never had any issues. I drive them 'wisely' witch means, warm up and cooling down must be respected, not always driving under full load, quicker oil changes sometimes changing the oil grade depending on the weather conditions. My oldie nissan is still going strong after 230000 km's on the clock and my Cupra after 100000 km. Since the Porsche'ists always claim that they are very reliable I am willing to give it a chance. It also depends on the fuell quality and climate where you live. From factory there are always big margin's on an engine to make sure durability/reliability is obtained everywhere (country/continent).

1) Fast
2) Cheap
3) Reliable

Pick two

I've always lived with that philosophy.

I like speed and being faster as much as the next guy. That said, most car (and motorcycle) makers design their cars at a specific durability and reliability level. Adding power to a stock car (or motorcycle) can affect it's reliability. It certainly can void most warranties.

I know some people may be able to throw away $70k or $90k without caring about it. I do believe, though, that to most people it's a lot of money. I know that I, for one, certainly don't want to toss $80k out the window.

Spending $1k-$2k on a tune is relatively cheap to gain around 30 or maybe 50 hp. It seems tempting. Think about it. Having a 400 hp Cayman would be pretty enticing. Or! A 350 hp base model which can be had for around $60k.

What are the long-term ramifications with the tunes? I have no idea.

This is also a dilemma I face. Is the Cayman S worth the $12,000 premium over the base model? Or do I spend the $2k for a tune to get close to the performance of the 'S' model while risking possible reliability issues? OR would I be happy with 'just' the stock base model?

That $12k extra would be a stretch for me. So, the temptation to get a tune will be real.

Without factual data, it will be an even more difficult decision.

Thanks everyone.