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?

[J-P]

That's what I've been told too! A CR with 380hp, would be an absolute weapon!

[PR36]

Sorry guys but i have read a lot on planet 9 of guys real world experience with tuning the gen 2 and have read nothing other than disappointment where these inflated claims are concerned. I would take this with a EU mountain sized pinch of salt.

[bearman68]

And porsche remapping is fraught with difficulty. It's very easy to brick the ECU. (OK, depends on the ECU, but worth a thought).

[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

[PR36]

The base figure on the graph is 'corrected' is it not to match the manufacture base figures, because otherwise if the power figure was taken from the rear wheels then there would be a lesser figure due to drivetrain loss? I also see that its a dynojet dyno and again alarm bells are ringing due to different power outputs for different dynos. There are lots of guys on planet 9 who have spent thousands of dollars chasing hp on these cars. I strongly recommend posting the same hp claims and dyno chart on there to see what response you get. I wouldn't hold your breath…!

[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.

[PR36]

Have you read this?

http://www.planet-9.com/porsche-dyno-charts/96561-...

[J-P]

PR36 said:

Have you read this?

http://www.planet-9.com/porsche-dyno-charts/96561-...

I have - it suggests a remap is not really worthwhile. But I've also heard from somebody that their map releases an extra 25bhp and is prepared to do a post tune dyno to prove it. Personally, I just want rid of the flat spot - 25hp on an NA car sounds over optimistic. But I may well do a before and after dyno run to see if there's any difference.

Edited by J-P on Sunday 15th March 20:47

[PR36]

J-P said:

PR36 said:

Have you read this?

http://www.planet-9.com/porsche-dyno-charts/96561-...

I have - it suggests a remap is not really worthwhile.

Edited by J-P on Sunday 15th March 20:47

Not worthwhile may be a bit of an understatement! He paid for multiple dyno runs on a cayman r with the most popular remaps available and they made less power than standard! And yet we have another chap suggesting he can get 30 hp from the same car with just a map. And if i go onto p9 and spend another 30 secs doing a search i would wager i can find similar threads. I am not trying to be argumentative, i have a softonic map on my 987.1 cayman, but would strongly suggest doing lots of research on this subject and you will find a common theme to the hp claims re cayman remapping. Basically it isn't worth it unless done in conjunction with exhaust, plenum, etc and even then don't expect the earth. It is very very easy to make a dyno show whatever you want it to!

[PorscheGT4]

Maybe 25bhp from a standard Cayman, but porsche have remapped a R already giving 10bhp more.

I think you would see a circa 13bhp gain from a remap as long as the maps tuned for 98ron fuel.
And you will get 15 bhp from manafolds.
May as well fit the vflow to aid air in a bit.

That should give you circa 355 bhp.

Many tests have been done on plenum and a 987.2 car flows enough air in so they say.

I tuned both gen 1 and Gen 2 engines and cannot see you getting more than 360bhp in the gen 2, unless you hire
A real expert and have a full custom to car tune, but no one in the UK does that.

The gen 1 needs the bigger throttle body as it's a smaller design.

981 CPU code cannot be hacked hence why the 991 remap seems to be used on 981 cars.

[J-P]

PorscheGT4 said:

Maybe 25bhp from a standard Cayman, but porsche have remapped a R already giving 10bhp more.

I think you would see a circa 13bhp gain from a remap as long as the maps tuned for 98ron fuel.
And you will get 15 bhp from manafolds.
May as well fit the vflow to aid air in a bit.

That should give you circa 355 bhp.

Many tests have been done on plenum and a 987.2 car flows enough air in so they say.

I tuned both gen 1 and Gen 2 engines and cannot see you getting more than 360bhp in the gen 2, unless you hire
A real expert and have a full custom to car tune, but no one in the UK does that.

The gen 1 needs the bigger throttle body as it's a smaller design.

981 CPU code cannot be hacked hence why the 991 remap seems to be used on 981 cars.

360bhp sounds about right to me.