9A1 3.4L remapping

[swimd]

I am thinking of buying a high milage Cayman R until my PTS GT4 arrives and I already have a friend lined up who would buy the car from me as a "track tool" when that day comes. The euro is weak and LHD CRs are quite cheap so I figure why not.

Some crafty guys over at pff.de report that all 3.4L 9A1 engines can be remapped to 350 hp with just software because they are no different from the 350 PS 991 C2.
They also get close to 380 hp/420Nm with software, exhaust and plenum. I have to say that sounds quite tempting, plus I get to run non-N spec tyres because the OPC would get a heart attack while checking the ECU.

Another interesting tidbit I didn't know: Boxster engines close the throttle valve to 45° at full throttle and above a certain RPM while Cayman throttle valves stay open all the time. That alone is where the 10 PS difference comes from.


green = stock
blue = remap
red = remap + exhaust + intake plenum



Does anybody have experience with this?

[swimd]

Here is the source for all of this:

http://www.pff.de/porsche/board104-porsche-modelle...

The poster (Racing Erich) does the remapping and modified his own 981S 3.4L to 380 PS @ 7600rpm before swapping a 3.8L 991 GTS engine in it which does 430 PS at the wheels corrected.

In the topic there are many reports of his work, almost every 981S had between 350 and 360 PS from just the software modification. Past that it's the usual law of diminishing returns. You need an exhaust, 991 plenum and racing cat to get 380 PS... not cheap.

Since he swaps the ECU file with a regular, non-modified Porsche 991 non-S file, the modification doesn't even show up on Porsche's diagnostic equipment. His customers passed many 111-point checks and warranty renewals with the modification.

Here's another Boxster S with 991 C2 software:

Edited by swimd on Sunday 15th March 20:21

[swimd]

anonymous said:

[redacted]

You're right, that's too much. More likely 430 PS at the crank.

Sounds nice though:

https://www.youtube.com/watch?v=FBmZjXJ5KLs

I'm not here to claim that this guy is the holy grail of remapping or defend those dyno charts, I'm just wondering if this could be plausible. Getting an extra 20-30 PS in a Cayman R while removing the "flat spot" for a 500€ software change would make the car a lot more attractive to me.